REQUEST FOR PROPOSALS(Date of Issuance: May 6, 2020)
YAP STATE PUBLIC SERVICE CORPORATION (YSPSC)WATER TANKS ENGINEERING DESIGN CONSULTANT SERVICESYAP STATE, FEDERATED STATES OF MICRONESIARFP NO. 2020- 001

On behalf of the Yap State Government, Federated States of Micronesia, the Office of Planning andBudget/Project Management Office (PMO) invites proposals for the provision of professional consultant
services to perform Engineering Design for the repairs and refurbishment of existing two atmospheric one
million gallons (MG) potable water steel tanks and Engineering Design for a new two hundred fifty
thousand gallons epoxy coated carbon steel potable water tank located in Colonia, Yap State, FSM.
Respondent may request a clarification or inquiry on any of the Request for Proposals (RFP) documents inwriting addressed to: Samuel E. Luzano, PMO Manager, Project Management Office, YCA Complex, P.O.
Box 970, Colonia, Yap FM 96943 at (691) 350- 2324 or emailed to seluzano@yapstategov.org
All Proposals are to be submitted in a sealed envelope marked “RFP No. 2020 - 001, YSPSC Water
Tanks Engineering Design” and must incorporate the name and address of the Respondent on theoutside of the envelope addressed to:
The PMO Manager
Project Management Office
YCA Complex, P.O. Box 970
Colonia, Yap FM 96943
Proposals must be submitted to the above address no later than July 7, 2020 at 3:00 p.m., YAP local
time to be eligible for consideration. Proposals received after the deadline shall be rejected.
Whenever Proposals will be sent via FedEx, UPS or other mail carrier, Respondent must ensure thatthe outside mailing package is also clearly marked “RFP- YSPSC Water Tanks Engineering Design” with
the name and address of the Respondent. Packages and envelopes not marked with the name of the
proposal may be misidentified and will be rejected.
Proposals can also be submitted in electronic copies by E-mail. Electronic copies of proposals sent throughE-mail shall be in PDF and submitted to:
Samuel E. Luzano
PMO Manager
seluzano@yapstategov.org
seluzano@gmail.com

Proposals thus received will be publicly opened and read by the PMO Manager or the designatedAuthorized Representative at the Project Management Office (PMO) in Yap State at 10:00 A.M. YAP local
time, on July 8, 2020.
The selected proposal will be formally awarded and announced publicly as soon as a complete review,
evaluation and comparison of the proposals had been made by the Evaluation Committee. Formal
notification of award to all respondents will occur immediately thereafter. Award of Consultant Services
Contract is subject to the availability of funds and budget appropriation from the Yap State Legislature.

Proposals must remain valid for a period of ninety (90) days from opening date of the proposals and are
to remain firm and unchanged once the proposal is awarded to the successful Respondent.
The PMO reserves the right to accept or reject any and all Proposals or parts thereof, to accept the
Proposal which the PMO deems to be in the best interest of the Yap State Government, to waive any
informality in the Proposals, and to negotiate further with the selected Respondent.

General Description of the Existing Water Tanks
The two potable water atmospheric steel tanks are both 1 MG tanks, 80 feet in diameter and 29 feet inheight (see Appendix 1). The existing water tanks were constructed in Yap State, Federated State ofMicronesia in 1971. Tank No. 1 is located in Dololeb while Tank No. 2 is located in Nimar. The tanks
and its gravity water distribution network are being operated and maintained by YSPSC, the Owner. The
two steel tanks are currently operational and impounding drinking water for the day-to-day
consumption of Yap State consumers.
Engineering Assessment and Testing for both existing water tanks have been performed by Central PacificTanks in October 2019. The final inspection reports are included in Appendix 2 and Appendix 3.
General Description of the Additional Water Tank No. 3
The additional 250,000 gallons epoxy coated carbon steel potable Water Tank No. 3 is approximately 40
feet in diameter and 31.76 feet in height. The location will be in the vicinity of the existing Water Tank
No. 2 in Nimar, Yap. See attached site development plan in Appendix 4 and original drawings in Appendix
5. The ground level pad is approximately 30 feet higher than the ground elevation of existing Water Tank
No. 2.
Water Tank No. 3 is essential and incidental to the refurbishment of the existing water tanks. This must
be built and operational prior to de-commissioning any of the two water tanks for repairs andrefurbishment.
Technical information and design criteria:• Site Class:D• Wind Rating:
150 mph• Seismic Use Group:
III

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Materials:
Coating:

Carbon Steel – ASTM 36
Interior basecoat thickness: 7 mils DFT average
Exterior basecoat thickness: 5 mils DFT average
Exterior polyester thickness: 3 mils DFT average
Floor type – Flat Steel Floor
Deck Type – 2:12 Roof (Center Supported)
Construction Type – Bolted on Type-1 ring-wall concrete mat foundation
Design according to AWWA D103
Accessories to include guardrail, center vent, 6” flange, 12” overflow, 24” manway, 24” roof
access hatch, 12” weir cone, 4” web truss, exterior ladder with safety climb system (OSHAcompliant)
Water connection to the existing service line at Water Tank No.2 is an 8-inch diameter cast ironpipe with isolation valves

Consultant Services Scope of Work
1. Close coordination with representatives of YSPSC, the Project Management Office and otherrelevant Yap State government agencies.
2. Prepare engineering design, specifications, detailed cost estimates and work plan schedule for the
repairs and refurbishment of the two existing water tanks as well as the proposed new water tank.
3. Basis of design will include the facts, figures, findings and recommendations of the Engineering
Assessment and Testing Reports done by Central Pacific Tanks Inc. and Powers Engineering andInspection Inc. for the two existing water tanks. Tanks repair and refurbishment work is inaccordance with AWWA D101- 53 (R1986), “Inspection and Repairing Steel Water Tanks,
Standpipes, Reservoirs and Elevated Tanks for Water Storage”.
4. Basis of Design for the additional Water Tank No. 3 is mentioned in the General Description
section of this RFP. This water tank shall be connected to the main water distribution system atexisting Water Tank No. 2. The water service line feeding the water tanks is an 8-inch diametercast iron pipe.
5. Consultant shall perform geotechnical soil investigation at the additional Water Tank No. 3 site
location.
6. Site development work to include site drainage and perimeter security chain link fence withlockable gate for both sites.
7. Design Phase Schedule. The projected turn-around time to completion of the design works andsubsequent handover of information to PMO.
Preliminary Design – 3 Months and Final Design – 2 Months.
General Requirements
Include as part of the Proposal references from work performed of a similar scope;
Present any applicable certificates or licenses held by the Respondent and its technical team members;
Any lobbying by or on behalf of the Respondent shall result in the rejection or disqualification of said
Proposal;

All information submitted shall be relevant to the RFP, practical and concise. Emphasis should be oncompleteness and clarity of content, and not on volume or elaborate presentation materials;
The Fee Proposal should present detailed costs for the services to be provided. Itemized cost breakdown
for all pay items including any reimbursable expenses shall be part of the Proposal.
Respondent shall be responsible to examine and fully inform themselves in relation to all aspects of the
RFP including the existing project site conditions before submitting their proposal. It is expected that eachRespondent had read and understood the RFP and its specifications with earnest. Failure to do so will beat the Respondent’s own risk and shall not be allowed to secure relief on a plea of error of omission orcommission;

Indemnification Clause
To the fullest extent permitted by law, the selected Respondent or Professional Service Provider shallprotect, indemnify, save, defend and hold harmless the PMO, Yap State Government and YSPSC including
its officers, representatives and employees (“Indemnified Parties”) from and against any and all liabilities,
obligations, claims, damages, penalties, causes of action, costs, interest and expenses, including but notlimited to reasonable attorney and paralegal fees, which Indemnified Parties may become obligated or
suffer by reason of any accident, bodily injury, death of person, or loss of or damage to property, arisingindirectly or directly under, out of, in connection with, or as a result of this Contract or the activities of
the Service Provider or its agents, employees, sub-contractors, and even if caused in whole or in part byany negligent or intentional act or omission of Indemnified Parties.
The PMO, Yap State Government and YSPSC shall not be required to defend or indemnify the Professional
Service Provider or its agents, employees, and sub-contractors.

Appendix 1
Tank No. 1

Description: Atmospheric Steel Tank (For potable water)
Volume:Diameter:Height:Overflow Elevation:
Constructed:
Location:

1,000,000 gallons
80 feet29 feet252 feet Year
1971
Dololeb, Yap State (near YSPSC power plant)

Tank No. 2

Description:
Volume:Diameter:Height:Elevation:
Constructed:

Atmospheric Steel Tank
1,000,000 gallons
80 feet29 feet Overflow
199 feet Year1971 Location:
Nimar, Yap State

Appendix 2

TANK 1 AWWA D101-53 INTERNAL/OUTOF-SERVICE TANK INSPECTION
Yap State Public Service Corporation (YSPSC),
Colonia, Yap
Report Prepared for:Project Management Office
Yap State, Federated States of Micronesia
Yap State Public Service Corporation
Yap State, Federated States of Micronesia
Contract/Task Order Number:Contract: C 231202 2019-192
Report Prepared by:Powers Engineering and Inspection, Inc. (PEI)
under subcontract to:Central Pacific Tanks, Inc.
P.O. Box 5213
Kaneohe, Hawaii 96744 USA
Inspected on:

October 10, 2019
Construction andInspection History:
Constructed

Bottom1971

1971

Next Inspection:

External Inspection

Internal Inspection

See Report

See Report

October 2019

October 2019

Report Revisions:
Rev 0
Rev 1
Rev 2
Rev 3

October 29, 2019
November 5, 2019
November 8, 2019
December 27, 2019

Original Report
Minor Revision
Revised Executive Summary Item 4.d.
Revised per Customer Comments

Reporting:

Inspector / Under Advisement of:

Dylan Macy
Inspector / Project Engineer
dylanmacy@powersei.com(707) 301-7743

Gary W. Powers, P.E.
President / Inspector
gowers@powersei.com(707) 334-3400

API 653 Authorized Inspector 64969
STI SP001 AST-T10391
ASNT Corporate Level II UT, PT, MT and VT

API 653 Authorized Inspector 0691
API 570 Authorized Inspector 22744
API 510 Authorized Inspector 24231
ASNT Corporate Level III UT, PT, MT and VT
California Civil PE 60589

UT Inspection

October 2019
See ReportPROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1
Table of Contents
Executive Summary ......................................................................................................................... 2
AWWA D101-53 Compliance .......................................................................................................... 5
Action Items ................................................................................................................................. 5
Consider Items ............................................................................................................................. 6
Monitor Items ............................................................................................................................... 6
Basic Tank Information .................................................................................................................... 7
Shell Settlement Survey .................................................................................................................. 8
Shell Thickness Calculation ............................................................................................................. 9
Shell Corrosion Rate Calculation ................................................................................................... 10
Shell Rollout ................................................................................................................................... 11
Shell Rollout (cont.) ....................................................................................................................... 12
Bottom Layout ................................................................................................................................ 14
Cone Roof Layout .......................................................................................................................... 15
Next Inspection Calculation ........................................................................................................... 16
Seismic Calculation ....................................................................................................................... 17
API 2000 Venting Calculations ...................................................................................................... 18
Appendix A
API 653 Inspection APP C Checklists
Appendix B
Significant Photos
General Photos
Appendix C
Non-Destructive Examination (NDE) UT Report

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1EXECUTIVE SUMMARY
Powers Engineering and Inspection Inc. was contracted by Central Pacific Tank (CPT) to provide
AWWA D101-53 Internal Inspection services for Tank 1 at the Yap State Public Service Corporationin Colonia, Yap.
Tank 1 was originally engineered and designed in 1971 by Sunn, Low, Tom & Hara Inc. The tankis an 80-ft diameter x 29-ft tall tank with a supported steel cone roof, butt-welded shell, and a 1/4in butt-welded bottom. The tank was most recently in Potable Water service.
The report and executive summary are based on field inspection and evaluation in accordance with
AWWA D101-53 and API 653 Standards. Before the tank is returned to service all the requirementsof AWWA D101-53 should be met.
Inspection
Goal
1. Identify any
current leakpaths
resultingfromcorrosion,internal orexternal.

Methods
Employed
100% Visual
Inspection (VT)of corner weld
and all bottom
welds for defects
or corrosion
100% Visual
Inspection (VT)of base of tank,bottom extension
and shell for
corrosion,
product stains orother signs of
product seepage.
Document with
Digital Camera

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Results
a. Utilizing the AWWA D101-53 and Manual M42 Chapter 9
guidelines for periodic inspections along with API 653 MRT
method for calculation of period to next inspection, the next
formal AWWA Internal Inspection can be extended 3 to 5 years
or as required by state regulatory agencies. The following
Executive Summary and Action Items lists repairs that should be
performed during the next planned outage.
b. The coatings on the 1/4-in thick bottom plates and internal shellwere noted to be ending or have surpassed it’s intended lifespanwith the most notable degraded locations being the lower 8-ft of
the internal shell plate, internal corner weld, and bottom platebutt-welds.
c. An MFL scan of the tank bottom was not performed during theinspection. Due to the extent of coating failure, disconnection of
the cathodic protection system, and unknown extent of soil sidecorrosion, the 1/4-in bottom should be replaced.
d. As internal coating is an important factor in protecting interior
surfaces from corrosion in water storage tanks, the new bottom
plates, shell plates, and roof structure should have a new internalcoating installed that meets AWWA D102 and NSF/ANSI 61
requirements.
e. The current cathodic protection system consists of (6) sacrificeanodes with only one anode currently connected to the tank. Thissystem was installed during the initial tank construction in 1971
and has not been properly maintained. The cathodic protection
system should be replaced with an API 651 compliant CP
system, and a reference anode pipe should be installed
underneath the bottom while the bottom plate is being replaced.
f. The internal shell plate is experiencing widespread carbuncle
corrosion and scaling due to the coating failure. During the timeof inspection, no identifiable pitting requiring repair was identified.
It is the Inspector’s opinion that during the time of sandblasting to
remove the existing coating, more extensive pitting will beidentified and should be evaluated at that time.
g. Extensive carbuncle corrosion was identified on the entirety of
the center column. Due to the extent of the pitting was well as
unidentifiable internal pipe corrosion of the center column, a“clam shell” should be installed around existing center column.
The clam shell shall consist of two halves of pipe that are seal
welded on both sides in order to provide additional support to the
corroded center while also protecting it from further corrosion.

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
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Tank 1

2. Identify any
risk areas for
future leakpathdevelopment

Utilize
Ultrasonic
Testing (UT) to
find areas ofpotential thinningor corrosion loss
from internal
corrosion.
Documentationof any brittle
fracture concerns
including nozzle
weld spacing.

3. Foundation
settlement

Survey of theshell forsettlement.
VT shell forbulges,AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

h. API 653 minimum shell thickness calculations were performed
and determined that the maximum height of product for the 1/4in first shell course is 26-ft. As the bell-mouth of the 8-in overflow
is located 28-ft above the bottom, special consideration should
be made to limit the maximum fill height to 26-ft or lower the
opening of the overflow to a maximum height of 26-ft.
i. Consideration should also be made to lowering the fill heights to
reduce the risk of sloshing damage during a strong seismic event.
a. A wear plate is currently not installed underneath the center
column’s base structure (crow’s foot). As this creates an area ofthe bottom plate that is not able to be inspected, install a 1/4-inthick wear plate underneath the crow’s foot that is lap-welded tothe bottom plate, after the bottom plate is replaced. Do not weld
the crow’s foot to the new wear plate. Install four (4) angle ironclips around the crow’s foot to limit horizontal movement.
b. There is currently an abandoned and corroded automated tankgauge bottom attachment welded directly to the bottom plate.
After the bottom replacement is completed and a new level gauge
is installed Photo D, install a 1/4-in repad underneath the newlevel gaugetank bottom bracket.
c. The tank bottom to foundation currently does not have a caulking
installed, allowing for water intrusion underneath the bottom aswell as increasing the risk of knife edge corrosion to occur on thebottom extension. After the bottom is replaced, install a flexible
caulking system around 100% of the bottom extension to
foundation interface.
d. The current anchoring system is an anchor bolt going through thebottom extension. Consider installing API 650 compliant anchor
chairs on the shell in order to adequately distribute seismic
loading to the shell rather than the bottom extension in the eventof seismic activity.
e. There is currently an anchor missing on the tank opposite of the
24-in manway. Replace the missing anchor bolt like-in-kind anduse an anchoring adhesive engineered for the calculated pull-out
strength of the anchors.
f. The shell reinforcing pads on the (2) 8-in nozzles and 24-in
manway do not have “tell-tales” installed in order to adequately
detect a leak in the shell behind the repads. Consider installing
API 650 compliant tell-tales in the repads in order to detect thepresence leaks.
g. Isolated nozzle, bottom repad, and shell repad geometry,spacings, and thickness were found to be below API 650
requirements. As these components, have been operating inservice at max capacity, no corrective action is required, andbrittle fracture risk is minimal. Monitor nozzles for signs of stressinduced damages along the shell to determine if corrective action
is needed in the future.
h. UT scrubs were performed in (8) radial lines around the tank fromthe shell to the center column. The lowest remaining thickness
measured with this technique on the 0.25-in thick bottom plates
was 0.232-in.
i. Visual inspection of the shell plate was performed to identify
product side corrosion with no required repairs of pitting being
identified. UT scrubs were performed along the top two courses
via manlift with no identifiable corrosion being present.
a. The maximum out-of-plane settlement was approximately 3.25in, which is within acceptable limits of API 653 Appendix B
calculations for differential settlement. See survey results.
b. The shell was inspected for verticality and distortion. No
significant distortion was identified.
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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

4. Accessstructures

distortion, orother verticality
issues.
Through visual
examination (VT)of accessstructure to
determine its
condition.

5. Cone Roof

VT of steel roof
deck and coating
UT ofcomponents androof deck

6. Venting

VT of existing
venting system

7. Coatings

VT of coatings

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

c. The seismic loads were calculated utilizing the latest API 650
Appendix E (ASCE 7/ IBC 2009 methods). The risk of damage
from a seismic event is minimal for all fill heights.
a. The internal vertical ladder is corroded beyond use and repair.
Photo B. Replace with a permanent fall arrest system compliant
with OSHA Subpart D installed on the ladderor an anchor point for a portable fall arrest system installed on or
above the existing 24-in roof manway.
b. The cone roof is accessed via vertical ladder on the tank shell.
The vertical ladder is currently in good condition with minor
coating failure. The vertical ladder is also over 24-ft tall without afall arrest system installed. Photo C. Install an OSHA Subpart D
compliantfall arrest system on the external vertical ladder.
c. The roof handrails near the vertical ladder appear to be in goodcondition with minor corrosion and coating failure.
d. The tank currently does not have system in place such as a fence
and locked gate to limit access to the tank.
a. Three (3) areas of through-hole corrosion was identified on thecone roof plate (see RLO) caused by coating failure andlocalized stagnant water. Install 1/4-in x 3-ft x 3-ft lap-welded
patch plates over these areas of corrosion. Photo F
b. The center column crow’s foot is experiencing corrosion
throughout its W-beam support members and bearing plate.
Replace the corroded center column crow’s foot with like-in-kindmaterials as well as like-in-kind welding techniques.
c. During inspection it was noted that the roof rafters areexperiencing minor bowing most likely due to seismic activity
with the most significant bow being measured at 6-in. The roof
rafters are currently not twisting indicating that rafters are notexperiencing lateral torsional buckling. Monitor the condition of
the roof rafters during the next formal internal inspection todetermine if the rafter conditions have worsened. Photo E
d. The 3/16-in roof deck appears to be in generally good condition
with no significant corrosion being identified visually or with UT
scrubs performed on the roof plate.
e. There are indications of a significant amount of localized watercollection areas depressions, known as “bird baths.” If the roof
coating is not replaced, these bird baths will eventually lead to
additional through-hole corrosion areas once the roof’s baresteel is exposed.
a. The tank is vented with an 18-in open center vent while the tankis serviced with 8-in nozzles. API 2000 venting calculations
indicate that the venting configuration is adequate.
b. Coating failure and minor corrosion is present on the center venta. As mentioned in the beginning of the Executive Summary, theinternal linings appear to have surpassed their intended lifespanand are now experiencing flaking and general wear leading toexposed steel. The new bottom plates, shell plates, and roof
structure should have a new internal coating installed that meets
AWWA D102 and NSF/ANSI 61 requirements after all repairs arecomplete.
b. The external shell plate, shell appurtenances, vertical ladder, andcone roof plate coatings are all experiencing coating failure in theform of worn and flaking coatings. Due to the tropical climate,corrosion of exposed steel will be higher than normal for thesetanks. It is strongly recommended that all external coatings
should be replaced to prevent further corrosion.

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1AWWA D101-53 COMPLIANCE
It is the best opinion of the Inspector that Tank 1 complies with the
AWWA D101-53 and Manual M42 standard if the following Action
Items are properly addressed:

ACTION ITEMS
1. Utilizing the AWWA D101-53 and Manual M42 Chapter 9
guidelines for periodic inspections along with API 653 MRT
method for calculation of period to next inspection, the next
formal AWWA Internal Inspection can be extended 3 to 5 years
or as required by state regulatory agencies.
Note: The action item repairs listed below can be performed atthat time.
2. Replace the existing ¼-in butt-welded bottom with a new ¼-in lap-welded bottom.
3. API 653 Minimum Shell Thickness calculations indicate that the maximum allowable heightof product for the tank is 26-ft. Limit the maximum fill height of water to 26-ft or modify the
overflow piping to have a maximum height of 26-ft.
4. Restore or replace the cathodic protection system with an API 651 compliant cathodic
protection system. The current system is a “1970’s era anode bed sacrificial cathodic
protection system that has not been properly maintained with only one anode connectedto the tank. Photo A
5. Install new internal coatings including bottom, shell, roof column and crow’s foot, andinternal shell stiffeners to prevent further internal corrosion. Preliminary coating tests
identified that the existing coatings do not contain lead or chromate, but a formal testing of
the coatings should be complete prior to sandblasting.
6. Install a “clam shell” around the existing 8-in center column. The clam shell shall consist of
two halves of a pipe that are seal welded on both sides in order to provide additional
support to the corroded center column while also protecting it from further corrosion.
7. Replace the corroded center column base structure (crows’ foot) like-in-kind.
8. Install a wear plate underneath the center column crows’ foot with seismic clips to allow forslight vertical movement of the center column while restraining from lateral movement. Do
not weld the crows’ foot to the wear plate.
9. Install (3) 1/4” x 3-ft x 3-ft lap-welded patch plates over the areas of through hole corrosion
on the cone roof plate (see RLO).
10. Replace the missing anchor bolt.
11. Replace or remove the corroded internal vertical ladder.
12. The vertical ladder providing access to the cone roof is over 24-ft tall with no fall arrest
system. Install an OSHA compliant fall arrest system on the vertical ladder.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1
13. Install a new automatic tank level gauge on the tank with a 1/4-in thick repad installed
underneath the new tank bottom bracket.

In addition to the above required Action Items, the following are listed for Consideration andMonitoring:

CONSIDER ITEMS
1. Consider lowering the shell fill height to reduce the risk of sloshing damage during a strong
seismic event.
2. Consider installing API 650 compliant anchor chairs on the shell in order to adequately
distribute seismic loading to the shell rather than the bottom extension in the event ofseismic activity.
3. Consider recoating the external shell and roof.
4. Consider installing API 650 compliant “tell-tales” on the shell appurtenance repads in orderto detect the presence of leaks.
5. Consider installing sealant around the bottom extension to foundation interface to mitigate
water intrusion underneath the bottom which could lead to soil side corrosion.
6. Consider adding fenced enclosure to the tank area for security.

MONITOR ITEMS
1. Visually, monitor the tank shell, exposed foundation and bottom extension for leaks on aperiodic basis.
2. Monitor the coatings and apply touch-up as needed.
3. The roof rafters are experiencing minor bowing likely due to center column settlement, windor seismic activity. The roof rafters are currently not twisting indicating the rafters are notexperiencing lateral torsional bowing. Monitor the condition of the roof rafters during thenext internal inspection to determine if the rafter conditions have worsened.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

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AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 1

BASIC TANK INFORMATION
Tank Number:
TANK 1

Product:

Owner:

Location:

YAP STATE PUBLICSERVICE CORPORATIONCOLONIA, YAP,FEDERATED STATES OFMICRONESIA

Diameter (ft):Height (ft):

POTABLE WATER

29

Year Built:

BUTT-WELDED W/CONE ROOF

BUTT-WELDED
Cone Roof Access:
UNCAGED VERTICALLADDER
Pumping Rate:
UNKNOWN
Leak Detection:--

Capacity (gal):

80

Type Tank:

Type Shell:

Unit/Zone/Area:

1971

Design Standard:
AWWA

733,950
Engineer/Designer:
SUNN, LOW, TOM & HARA INC.

Type Roof:Type Foundation:

SUPPORTED CONE ROOF

CONCRETE RINGWALL

Floating Roof Access:

Roof Vents:

NA

Suction Line:
1: 8-IN
Secondary Containment:

Type Bottom:
1/4-IN BUTT-WELDED
Roof Manways:

1: 18-IN OPEN VENT

Receipt:

1: 24-IN

Shell Manways:
1: 8-IN

1: 24-IN

Cathodic Protection:

Insulation:

NONE

N/A

Shell Coatings:

Floating Roof Coatings:

Bottom Coating:

YES

NA

YES

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

SACRIFICIAL ANODE

Page 7 of 17

NONE

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1SHELL SETTLEMENT SURVEY

The settlement for the tank is planer or roughly approximates the shape of a cosine
curve.
The evaluation of this “out-of-levelness” or settlement, utilizing the criterion for “out-ofplane distortion” as described in API 653 Appendix B.3.2, indicates that the settlement iswell within the acceptable limits.

Applicable Standards:
Shell settlement surveys were conducted in accordance with the requirements of API 653
Figure B-1. These surveys were evaluated in accordance with the API 653 Appendix
B.2.2 and compared with the acceptance criteria outlined in API 653 Appendix B.3.2.
Note:
Calculation of maximum permissible S or out-of-plane distortion per API 653 Appendix
B.3.2 was made using:

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

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PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1SHELL THICKNESS CALCULATION
Shell Thickness Calculations per API 653 4.3.3.1

F ind:© POWERS Engineering and Inspection, Inc. 2019

M inimum she ll thickne ss (t min) fo r e a ch she ll course utilizing the AP I 653 sta nda rd fo r ta nks le ss tha n 200 ft d ia .

Give n:Varia ble I de ntifier

H
D
G
S
E
M

1.00

S o lutio n:

D esc ription

Value

Re fe re nce

Fill he ig ht (ft) 26.00 M e a sure d from the ba se of e a ch she ll co urse (se e column H in the ta b le b e lo w)
T a nk D ia me te r (ft) 80.00
S p e cific Gra vity
1.00
Allo w stre ss (p si) V a rie s R e fe re nce AP I 653 T a b le 4-1
Joint E fficie ncy V a rie s R e fe re nce AP I 653 ta b le 4.2 fo r W e ld e d a nd 4.3 fo r R ive te d constructio n
T e mp M o d ifie r V a rie s R e fe re nce AP I 650 App e nd ix M E le va te d te mpe ra ture mo difie r
1stCo urse S tress (p si) = (g *2.6(D(H-1)/ t) = 20,800 (p si)
T a ble fo r Ca lcula ting minimum she ll thickne ss (t min) fo r e a ch she ll co urse

H
C
o
u
r
s
e

Produc t
H eight
Above
CourseH eight of e ach
Course
(in)

(ft)

E

T ype of
Joint foreach Course(ft)

Joint Eff
API 653
T bl 4. 2
a nd 4. 3

S

Ma te rial T ype
or U nknown
W elded or R iv eted%

Maximum
Allowable
Stress(psi)

API 65 3 Re quire d Calculationt m in =2.6 ( H - 1) DG
SEM

API 653 4. 3. 3. 1

ActualSolution

Req'd
t min

Minimum
T hickne ss
for Course

(in)

(in)

OK?

0.24590.2500Ok

0.19670.2500Ok

0.13410.2500Ok

0.10000.2500Ok

0.10000.2500Ok

0.10000.2500Ok

ActualVs
R eq'd

2.6 x ( 26.00 - 1 ) x 80.00 x 1.00
1

60.00

5

26.00

85% Butt W e ld

0.85

A 36

24,882( 24,882 x 0.85 x 1.00)

2

60.00

5

21.00

85% Butt W e ld

0.85

A 36

24,882

2.6 x ( 21.00 - 1 ) x 80.00 x 1.00
( 24,882 x 0.85 x 1.00)

3

60.00

5

16.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 16.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

4

60.00

5

11.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 11.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

5

60.00

5

6.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 6.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

6

45.00

3.75

1.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 1.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 9 of 17

Date Printed: 12/27/19 11:09 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 1SHELL CORROSION RATE CALCULATION
Shell Corrosion Rate Calculations API 653 6.3, Widely Scattered Pits

© POWERS Engineering and Inspection, Inc. 2019D a te(s)A

I nspec tion Ye ar

B

T hick ne ss

N
Corrosion R a te(s)Calc ulate d

CourseMea suredYear
B uilt o r R e pla c e d

Pre v

Curre nt

As Built

Prev

Currentt min

Prev ious

(yr)

(yr)

(yr)

(in)

(in)

(in)

(in)

(in/ yr)(in/ yr)

1
2
3
4
5
6

1971
1971
1971
1971
1971
1971

1971
1971
1971
1971
1971
1971

2019
2019
2019
2019
2019
2019

0.250
0.250
0.250
0.250
0.250
0.250

0.250
0.250
0.250
0.250
0.250
0.250

0.242
0.244
0.241
0.248
0.245
0.245

0.123
0.098
0.067
0.050
0.050
0.050

N/A
N/A
N/A
N/A
N/A
N/A

0.00020.00010.00020.00000.00010.0001

Current

R CA
API 65 3
6 .3 . 2. 1
(A-B)
(in)

0.11910.14570.17400.19800.19500.1950minimum:

RCA = The difference between the measured thickness and the minimum required thickness (in per year are used in this calculation) ref API 653 6.3.2.1
Per API 653 Section 4.3.2.2 a), no pit depth results in the remaining shell thickness being less than one-half the minimum acceptable tank shell
thickness exclusive of the corrosion allowance

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 10 of 17

Date Printed: 12/27/19 11:09 AM

R CA/ 4 N
N e xtExte rnal
API 65 3
6. 3 .2
(yr)

5.00
5.00
5.00
5.00
5.00
5.00
5.00

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1SHELL ROLLOUTAWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 11 of 17

Date Printed: 12/27/19 11:09 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1SHELL ROLLOUT (CONT.)AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 12 of 17

Date Printed: 12/27/19 11:09 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 1

BOTTOM LAYOUT(8x) ULTRASONIC THICKNESS SCRUBSPERFORMED ON BOTTOM PLATE

18-IN UNDER BOTTOM SUCTION

7

2 3

6

5 4

24-IN MANWAY
8

18

9

17

19

10

16

20

11 12

15

21

14 13

22 23

8-IN NOZZLE
1-IN NOZZLE
29

30

28

31

27

32

8-IN CENTER COLUMN w/ 76-IN x 96-IN CROWS FOOTREPLACE C8 CROWS FOOT BASE LIKE IN KIND
INSTALL 1/4-IN THK WEAR PLATE BENEATH CROWS FOOT

42

43

54

33

25 24

34 35

36

40
39

44

53

26

45

52

38 37

46 47

51

48

LEVEL GAUGE

50 49

55

VERTICAL LADDERREPLACE CORRODED LADDER

61
56

67

57 58

66

68

59 60

65

69

64

70

63 62

71 72

78

73
77

76

75 74

79

83
80
87

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

81 82
86

85 84

Page 13 of 17

Date Printed: 12/27/19 11:09 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 1

CONE ROOF LAYOUTRANDOM ULTRASONIC THICKNESSSCRUBS PERFORMED ON ROOF
PLATE
1

VERTICAL LADDERNO FALL ARREST SYSTEM

9

3

4 5

8

7 6

10

14
11

24-IN MANWAY
6-IN ALARM

2

20

19

21

31

32

12

18

17

22

23

30

33

13

29

16 15

24 25

28

34

35

27 26

36 37

38

42

18-IN OPEN VENT
44

43

41

40 39

THROUGH HOLE CORROSION
45

46

57

47

48

56

55

49 50

54

51

53 52

58

64
59

70

60 61

62 63

69

71

68

67

72
73

66 65

74 75
76

81
80

79

78 77

82

86
83
91

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

90

89

THROUGH HOLE CORROSION

84 85
88 87

Page 14 of 17

Date Printed: 12/27/19 11:09 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

NEXT INSPECTION CALCULATION
The tank bottom will be replaced. It is the best opinion of the Inspector that the bottom has a remaining life of 2-3 years until a leak occurs.
Periodic monitoring of the tank bottom for a leak should be performed until the bottom is replaced.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 15 of 17

Date Printed: 12/27/19 11:09 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 1SEISMIC CALCULATION
Seismic Design per API 650 11th Appendix E© POWERS Engineering and Inspection, Inc. 2019

Find: P ro duct fill he ig ht for se ismic loa ding utilizing AP I 650 12th e d itio n App e nd ix E M e thod olog y
Give n:
T a nk N umb e r:

1

T ype R oo f 3 Co ne R o of with no Inte rna l Flo a ting R o ofT a nk (D )ia me te r (ft)T a nk (H )e ig ht or le ngth fo r H orizonta l T a nk (ft)S e ismic P ro duct fill H e ig ht (ft)S p e cific (G)ra vity
E le va tio n o f ta nk bo ttom a bo ve g ra de (ft)Loca tio n:

La titude (d e g)Long itude (d e g)

S p e ctra l R e sp onse F a cto rs

80.00
29.00
26.00
1.00
0.66667

H fill26 (ft) Operational

9.514400
138.129400

Ss
S1
So

0.79
0.31
0.314

78.60%U S GS o r U F C 3-101 -1 tbl F-2
31.40%U S GS o r U F C 3-101 -1 tbl F-2= S s*0.4 fo r M a p pe d Me thods

Fa
Fv

1.186
1.77

AP I 650 T a b le E -1
AP I 650 T a b le E -2

R e gio na l-d e pe nda nt tra nsitio n p e riod
TL
S m1=Fv*S 1
U se Group Imp orta nce F a ctor (AP I 650 T b l E -5)
S ite S oil Cla ssifica tionS e ismic U se Gro up

0.5564
1
D S tiff S oil
I

AS CE 7 ma ps

T hickne ss of Bo tto m unde r the she ll (in)Min R e q 'd T hickne ss o f Bo tto m unde r she ll (in)Ca lc'd 23.43 W idth of Annula r P la te (in)AP I 650 Ap pe ndix M T e me p ra ture Mo difie r
Y ie ld o f Bottom U nde r S he ll (p si)
Y ie ld of 1st she ll course (p si)

0.25000.10001.95
1.00
30,00036,000(p si)Mo dulus of E la sticity (p si)
W e ight p e r Cubic ft o f M a te ria l (p cf)
S now Loa d (p sf)

24,88229,000,000
Steel
10

Sd
E

100

V

S ite Co e fficie nts

3-se c Gust D e sign W ind V e locity (mph)V a rie s from 4 to 16

T a b le E -3 AP I 650 IBC 2009 ta ble 1613.5.2
SU I or I
U se : g ro up IV Milita ry III e sse ntia l, II p ublic risk, o r I
tb
AP I 653
L
AP I 650 Ap p e ndix E .6.2.1.1.1
Tm
Fb y
F yie ld 1st Co urse

490 pcf
IBC 1608.4 o r U FC 3-101 -1 tb l F -1
IBC 2009 fig 1609 or U F C 3-101 -1 tb l F -1

Solution:
AP I 650 12th App e ndix E Ca lcula tions fo r La t 9.51440 a nd Long 138.12940
Seismic Overturning or Uplift Risk w/o Anchors?

No Seismic uplift is expected for fill heights < 26.00 (ft)Compressive Shell Stress from Seismic Loads ?

Good ! Calculated Seismic Compressive Stress is less than Allowable

Height of sloshing wave per API 650 Appendix E ?
Wind Overturning for 100 mph wind?

The calculated height of the sloshing wave is 1.64 (ft); recommended freeboard 1.15 (ft)Wind Overturning OK for API 650. No anchors are required to resist wind overturning

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 16 of 17

Date Printed: 12/27/19 11:09 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

API 2000 VENTING CALCULATIONSAWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 1 October 2019 rev 3© 2019 PE&I Inc.

Page 17 of 17

Date Printed: 12/27/19 11:09 AM

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1APPENDIX A: API 653 CHECKLISTEXTERNAL
1.1 FOUNDATION
ALL
C.1.1

Measure foundation levelness and bottom elevations

See Report 'Shell
Settlement Survey'

CONCRETE RING WALL
C.1.1.1 a

Inspect for broken concrete, spalling, and cracks, particularly under backup
bars used in welding butt welded annular rings under the shell.

See report

C.1.1.1 b

Inspect drain openings in ring, back of water draw basins and top surfaceof ring for indications of bottom leakage.

OK

C.1.1.1 c

Inspect for cavities under foundation and vegetation against bottom of tank.

OK

C.1.1.1 dCheck that runoff rainwater from the shell drains away from tank.

OK

C.1.1.1 e

Check for settlement around perimeter of tank.

OK

C.1.1.2. a

Check for settling of tank into asphalt base which would direct runoff rainwater under the tank instead of away from it.

NA Concrete
RingwallC.1.1.2. b

Look for areas where leaching of oil has left rock filler exposed, whichindicates hydrocarbon leakage.

NA Concrete
RingwallASPHALTOILED DIRT OR SAND
C.1.1.3 a

Check for settlement into the base which would direct runoff rain water
under the tank rather than away from it.

NA Concrete
RingwallROCK
C.1.1.4 a

Presence of crushed rock under the steel bottom usually results in severe
underside corrosion. Make a note to do additional bottom plateexamination (ultrasonic, hammer testing, or turning of coupons) when thetank is out of service.

NA Concrete
Ringwall

SITE DRAINAGE
C.1.1.5 a

C.1.1.5 b

Check site for drainage away from the tank and associated piping andmanifolds.
Check operating condition of the dike drains.

Drainage is awayfrom tank
Not Performed

HOUSEKEEPING
C.1.1.6. aInspect the area for buildup of trash, vegetation, and other inflammablesbuildup.

None present

1.2 SHELLSEXTERNAL VISUAL INSPECTION
C.1.2.1. a

Visually inspect for paint failures, pitting, and corrosion.

See Report

C.1.2.1. b

Clean off the bottom angle area and inspect for corrosion and thinning onplate and weld.

See Report

C.1.2.1. c.

Inspect the bottom-to-foundation seal, if any

None Present

INTERNAL (FLOATING ROOF TANK)
C.1.2.2.aVisually inspect for grooving, corrosion, pitting, and coating failures.

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 1 of 17

NA
Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1RIVETED SHELL INSPECTION
C.1.2.3. a

Inspect external surface for rivet and seam leaks

Shell Not Riveted

C.1.2.3. b

Locate leaks by sketch or photo (location will be lost when shell is abrasive
cleaned for painting).

Shell Not Riveted

C.1.2.3. c

Inspect rivets for corrosion loss and wear

Shell Not Riveted

C.1.2.3. dInspect vertical seams to see if they have been full fillet lap welded toincrease joint efficiency

Shell Not Riveted

C.1.2.3. e

If no record exists of vertical riveted seams, dimension and sketch (orphotograph) the rivet pattern: number of rows, rivet size, pitch length, andnote whether the joint is butt riveted or lap riveted.

Shell Not Riveted

WIND GIRDER (FLOATING ROOF TANKS)
C.1.2.4. a

Inspect wind girder and handrail for corrosion damage (paint failure, pitting,corrosion product buildup), especially where it occurs at tackwelded junction, and for broken welds.

C.1.2.4. b

Check support welds to shell for pitting, especially on shell plates.

No Wind Girder

C.1.2.4. c

Note whether supports have reinforcing pads welded to shell.

No Wind Girder

No Wind Girder

1.3 SHELL APPURTENANCESMANWAYS AND NOZZLESNo seeps present

C.1.3.1. a

Inspect for cracks or signs of leakage on weld joint at nozzles, manways,
and reinforcing plates.

C.1.3.1. b
C.1.3.1. c

Inspect for shell plate dimpling around nozzles, caused by excessive pipe
deflection.
Inspect for flange leaks and leaks around bolting.

C.1.3.1. dInspect sealing of insulation around manways and nozzles.

N/A Tank Not

C.1.3.1. eCheck for inadequate manway flange and cover thickness on mixer
manways.

No Mixer

No distortion
No seeps present
Insulated

TANK PIPING MANIFOLDS
C.1.3.2. a

Inspect manifold piping, flanges, and valves for leaks.

No leaks observed

C.1.3.2. b

Inspect firefighting system components

NA

C.1.3.2. c

Check for anchored piping which would be hazardous to the tank shell orbottom connections during earth movement.

NA

C.1.3.2. dCheck for adequate thermal pressure relief of piping to the tank.

NA

C.1.3.2. eCheck operation of regulators for tanks with purge gas systems.

Not Performed

C.1.3.2. f

Check sample connections for leaks and for proper valve operation

NA

C.1.3.2. g

Check for damage and test the accuracy of temperature indicators.

NA

C.1.3.2. hCheck welds on shell-mounted davit clips above valves 6 inches and larger.

No davit clips
present

AUTO GAUGE SYSTEM
C.1.3.3. a

Inspect auto gauge tape guide and lower sheave housing (floating swings)
for leaksNA

C.1.3.3. b

Inspect auto gauge head for damage

NAC.1.3.3. c

Bump the checker on auto gauge head for proper movement of tape.

NA

C.1.3.3. dIdentify size and construction material of auto gauge tape guide (floating
roof tanks).

NA

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 2 of 17

Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1C.1.3.3. e

Ask operator if tape tends to hang up during tank roof movement (floating
roof tanks).

NA

C.1.3.3. f

Compare actual product level to the reading on the auto gauge (maximum
variation is 2 inches).

NA

C.1.3.3. g

On floating roof tanks, when the roof is in the lowest position, check that no
more than two feet of tape are exposed at the end of the tape guide.

NA

C.1.3.3. h

Inspect condition of board and legibility of board-type auto gauges.

NA

C.1.3.3. i

Test freedom of movement of marker and float.

NA

SHELL MOUNTED SAMPLE STATION
C.1.3.4. a

Inspect sample lines for function of valves and plugging of lines, including
drain or return-to-tank line.

NA

C.1.3.4. b

Check circulation pump for leaks and operating problems.

NA

C.1.3.4. c

Test bracing and supports for sample lines and equipment.

NA

HEATER (SHELL MANWAY MOUNTED)
C.1.3.5. a

Inspect condensate drain for presence of oil indicating leakage

NA

C.1.3.6. aInspect for proper mounting flange and support.

NA

C.1.3.6. b

Inspect for leakage.

NA

C.1.3.6. c

Inspect condition of power lines and connections to mixer.

NA

MIXER

SWING LINES: WINCH OPERATION
C.1.3.7. a
C.1.3.7. b

C.1.3.7. c

Non-floating. Raise, then lower the swing line with the winch, and checkfor cable tightness to confirm that swing line lowered properly.
Floating. With tank half full or more, lower the swing line, then let out cableand check if swing has pulled cable tight, indicating that the winch isoperating properly.

NA

Indicator. Check that the indicator moves in the proper direction: Floating
swing line indicators show a lower level as cable is wound up on the winch.

NA

NA

Non-floating swing line indicators show the opposite.
SWING LINES: EXTERNAL GUIDE SYSTEM
C.1.3.8. a

Check for leaks at threaded and flanged joints.

NA

SWING LINES: IDENTIFY BALLAST VARYING NEED
C.1.3.9. a

Check for significant difference in stock specific gravity.

NA

SWING LINES: CABLE MATERIAL AND CONDITION
C.1.3.9.1. a

For non-stainless-steel cable, check for corrosion over entire length.

NA

C.1.3.9.1. b

All cable: check for wear or fraying.

NA

SWING LINES: PRODUCT SAMPLE COMPARISON
C.1.3.9.1. a

Check for water or gravity differences that would indicate a leaking swing
joint.

NA

SWING LINES: TARGET
C.1.3.9.1. dTarget should indicate direction of swing opening (up or down) and height
above bottom where suction will be lost with swing on bottom support.

NA

1.4 ROOFSDECK PLATE INTERNAL CORROSION
For safety, before accessing the roof, check with ultrasonic instrument or
C.1.4.1 alightly use a ball peen hammer to test the deck plate near the edge of the

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 3 of 17

UT 3/16-in Nominal
Thickness
Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1
roof for thinning. (Corrosion normally attacks the deck plate at the edge ofa fixed roof and at the raft
DECK PLATE EXTERNAL CORROSION
C.1.4.2. a

Visually inspect for paint failure, holes, pitting, and corrosion product on theroof deck.

See Report

ROOF DECK DRAINAGE
C.1.4.3. a

Look for indication of standing water. (Significant sagging of fixed roof deck
indicates potential rafter failure. Large standing water areas on a floating
roof indicate inadequate drainage design or, if to one side, a non-levelroof with possible leaking

See report

LEVEL OF FLOATING ROOF
C.1.4.4. a

At several locations, measure distance from roof rim to a horizontal weld
seam above the roof. A variance in the readings indicates a non-level roof
with possible shell out-of-round, out-of-plumb, leaking pontoons, or hangup.

N/A

INTERNAL FLOATING ROOF
C.1.4.5. a

Test for explosive gas on top of the internal floating roof. Readings could
indicate a leaking roof, leaking seal system, or inadequate ventilation of thearea above the internal floating roof.

N/A

ROOF INSULATION
C.1.4.6. a

Visually inspect for cracks or leaks in the insulation weather coat whererunoff rainwater could penetrate the insulation.

C.1.4.6. b

Inspect for wet insulation under the weather coat.

N/A No Roof
Insulation

C.1.4.6. cRemove small test sections of insulation and check roof deck for corrosionand holes near the edge of the insulated area.

N/A No Roof
Insulation

N/A No Roof
Insulation

FLOATING ROOF SEAL SYSTEMS
C.1.4.6. a

Measure and record maximum seal-to-shell gaps at: 1. Low pump out. 2.
Mid-shell. 3.High liquid level.

C.1.4.6. b

Measure and record annular space at 30-foot spacing (minimum of four
quadrants) around roof and record. Measurements should be taken in
directly opposite pairs. 1.Opposite pair. 2. Opposite pair.

C.1.4.6. c

Check if seal fabric on primary shoe seals is pulling shoes away from shell(fabric not wide enough).

N/A

C.1.4.6. dInspect fabric for deterioration, holes, tears, and cracks.

N/A

C.1.4.6. eInspect visible metallic parts for corrosion and wear.

N/A

C.1.4.6. f

Inspect for openings in seals that would permit vapor emissions.

N/A

C.1.4.6. g

Inspect for protruding bolt or rivet heads against the shell.

N/A

C.1.4.6. hPull both primary and secondary seal systems back all around the shell tocheck their operation.

N/A

C.1.4.6. i

Inspect secondary seals for signs of buckling or indications that their angle
with the shell is too shallow.

N/A

C.1.4.6. j

Inspect wedge-type wiper seals for flexibility, resilience, cracks, and tears.

N/A

N/A
N/A

1.5 ROOF APPURTENANCESSAMPLE HATCH
C.1.5.1. a

Inspect condition and functioning of sample hatch cover.

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Tank 1C.1.5.1. b

On tanks governed by Air Quality Monitoring District rules, check for thecondition of seal inside hatch cover.

N/A

C.1.5.1. c

Check for corrosion and plugging on thief and gauge hatch cover.

N/A

C.1.5.1. d

Where sample hatch is used to reel gauge stock level, check for marker
and tab stating hold off distance.

N/A

C.1.5.1. eCheck for reinforcing pad where sample hatch pipe penetrates the roof
deck.

N/A

C.1.5.1. f

On floating roof sample hatch and recoil systems, inspect operation of recoil
reel and condition of rope.

N/A

C.1.5.1. g

Test operation of system.

N/A

C.1.5.1. h

On ultra clean stocks such as JP4, check for presence and condition ofprotective coating or liner inside sample hatch (preventing rust from pipe
getting into sample).

N/A

GAUGE WELL
C.1.5.2. a

Inspect visible portion of the gauge well for thinning, size of slots, and covercondition

N/A

C.1.5.2. b

Check for a hold off distance marker and tab with hold off distance (legible).

N/A

C.1.5.2. c

On floating roofs, inspect condition of roof guide for gauge well, particularly
the condition of the rollers for grooving.

N/A

C.1.5.2. d

If accessible, check the distance from the gauge well pipe to the tank shellat different levels.

N/A

C.1.5.2. e

If tank has a gauge-well washer, check valve for leakage and for presenceof a bull plug or blind flange.

N/A

FIXED ROOF SCAFFOLD SUPPORT
C.1.5.3. a

Inspect scaffold support for corrosion, wear, and structural soundness.

N/A

AUTOGAUGE: INSPECTION HATCH AND GUIDES (FIXED ROOF)
C.1.5.4. a

Check the hatch for corrosion and missing bolts.

N/A

C.1.5.4. b

Look for corrosion on the tape guide's and float guides wire anchors.

N/A

AUTOGAUGE: FLOAT WELL COVER
C.1.5.5. a

Inspect for corrosion.

N/A

C.1.5.5. b

Check tape cable for wear or fraying caused by rubbing on the cover.

N/A

SAMPLE HATCH (INTERNAL FLOATING ROOF)
C.1.5.6. aCheck overall conditions.

N/A

C.1.5.6. b

When equipped with a fabric seal, check for automatic sealing after
sampling.

N/A

C.1.5.6. c

When equipped with a recoil reel opening device, check for proper
operations

N/A

ROOF-MOUNTED VENTS (INTERNAL FLOATING ROOF)
C.1.5.7. a

Check condition of screens, locking and pivot pins.

N/A

GAUGING PLATFORM DRIP RING
C.1.5.8. a

On fixed roof tanks with drip rings under the gauging platform or samplingarea, inspect for plugged drain return to the tank

N/A

EMERGENCY ROOF DRAINS
C.1.5.9. a

Inspect vapor plugs for emergency drain: that seal fabric discs are slightly
smaller than the pipe ID and that fabric seal is above the liquid level.

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Tank 1REMOVABLE ROOF LEG RACKS
C.1.5.9.1. a

Check for leg racks on roof.

N/A

VACUUM BREAKERS
C.1.5.9.2. b

Report size, number, and type of vacuum breakers. Inspect vacuum
breakers. If high legs are set, check for setting of mechanical breakers inhigh leg position.

NA

C.1.5.9.3. a

Check condition of the screen on the rim vent cover.

NA

C.1.5.9.3. b

Check for plating off or removal of rim vents where jurisdictional rules do
not permit removal.

NA

RIM VENTS

PONTOON INSPECTION HATCHES
C.1.5.9.4. aOpen pontoon inspection hatch covers and visually check inside forpontoon leakage.

NA

C.1.5.9.4. b

Test for explosive gas (an indicator of vapor space leaks).

NA

C.1.5.9.4. c

If pontoon hatches are equipped with locked down coves, check for venttubes. Check that vent tubes are not plugged up. Inspect lock down devices
for condition and operationNA

ACCESS STRUCTURESHANDRAILS
C.1.6.1. a

Identify and report type (steel pipe, galvanized pipe, square tube, angle)
and size of handrails.

OSHA Compliant

C.1.6.1. b

Inspect for pitting and holes, paint failure.

Thinning Paint

C.1.6.1. c

Inspect attachment welds.

C.1.6.1. dIdentify cold joints and sharp edges. Inspect the handrails and mid-rails

Attachment welds
in good condition
Handrails free fromcold joints andsharp edges.

C.1.6.1. e

Inspect safety drop bar (or safety chain) for corrosion, functioning, andlength.

Not Present

C.1.6.1. f

Inspect the handrail between the rolling ladder and the gaging platform fora hazardous opening when the floating roof is at its lowest level.

NA

PLATFORM FRAME
C.1.6.2. a

Inspect frame for corrosion and paint failure.

N/A

C.1.6.2. b

Inspect the attachment of frame to supports and supports to tank forcorrosion and weld failure.

N/A

C.1.6.2. c

Check reinforcing pads where supports are attached to shell or roof.

N/A

C.1.6.2. dInspect the surface that deck plate or grating rests on, for thinning andholes.

N/A

C.1.6.2. eCheck that flat-surface to flat-surface junctures reseal welded.

N/A

DECK PLATE AND GRATING
C.1.6.3. a

Inspect deck plate for corrosion-caused thinning or holes (not drain holes)
and paint failure.

N/A

C.1.6.3. b

Inspect plate-to-frame weld for rust scale buildup.

N/A

C.1.6.3. c

Inspect grating for corrosion-caused thinning of bars and failure of welds

N/A

C.1.6.3. dCheck grating tie down clips. Where grating has been retrofitted to replace
plate.

N/A

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Tank 1STAIRWAY STRINGERS
C.1.6.4. a

Inspect spiral stairway stringers for corrosion, paint failure, and weld failure.

N/A

Inspect attachment of stairway treads to stringer.
C.1.6.4. b

Inspect stairway supports to shell welds and reinforcing pads.

N/A

C.1.6.4. c

Inspect steel support attachment to concrete base for corrosion.

N/A

ROLLING LADDER
C.1.6.5. a

Inspect rolling ladder stringers for corrosion.

NA

C.1.6.5. b

Identify and inspect ladder fixed rungs (square bar, round bar, angles) for
weld attachment to stringers and corrosion, particularly where angle rungsNA

are welded to stringers
C.1.6.5. c

Check for wear and corrosion where rolling ladder attaches to gauging
platform.

NA

C.1.6.5. dInspect pivot bar for wear and secureness.

NA

C.1.6.5. eInspect operation of self-leveling stairway treads.

NA

C.1.6.5. f

Inspect for corrosion and wear on moving parts.

NA

C.1.6.5. g

Inspect rolling ladder wheels for freedom of movement, flat spots, and wear
on axle.

NA

C.1.6.5. h

Inspect alignment of rolling ladder with roof rack.

NA

C.1.6.5. i

Inspect top surface of rolling ladder track for wear by wheels to assure atleast 18 inches of unworn track (track long enough).

NA

C.1.6.5. j

Inspect rolling ladder track welds for corrosion.

NA

C.1.6.5. k

Inspect track supports on roof for reinforcing pads seal welded to deckplate.

NA

C.1.6.5. lCheck by dimensioning, the maximum angle of the rolling ladder when theroof is on low legs.

NA

C.1.6.5. m

If rolling ladder track extends to within five feet of the edge of the roof on
the far side, check for a handrail on the top of the shell on that side. Max.

NA

angle

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Tank 1

INTERNAL
2.10 OVERVIEW
SAFETY
C.2.1. a

Check that tank has been cleaned, is gas free, and safe for entry.

Acceptable

C.2.1. b

Check that the tank is completely isolated from product lines, all electrical
power, and steam lines.

Acceptable

C.2.1. c

Check that roof is adequately supported, including fixed roof structureand floating roof legs

See Report

C.2.1. d

Check for presence of failing object hazards, such as corroded-throughroof rafters, asphalt stalactites, and trapped hydrocarbons in unopened
or plugged equipment or appurtenances, ledges, etc.

Acceptable

C.2.1. eInspect for slipping hazards on the bottom and roof decks.

Tank bottom isclean

C.2.1. f

Inspect structural welds on access ways and clips

Acceptable

C.2.1. g

Check surfaces needing inspection for a heavy-scale buildup and checkweld seams and oily surfaces where welding is to be done. Note areas
needing more cleaning, including blasting.

Good

2.2 TANK EXTERIOR
INSPECTION
C.2.2. a

Inspect appurtenances opened during cleaning such as lower floating
swing sheave assemblies, nozzle interiors (after removal of valves).

OK

C.2.2. b

Hammer test or ultrasonically test the roof.

OK

C.2.2. cEnter and inspect the floating roof pontoon compartments.

NA

2.3 BOTTOM INTERIOR SURFACEINSPECTION
See Report

C.2.3. aUsing a flashlight held close to and parallel to the bottom plates, andusing the bottom plate layout as a guide, visually inspect and hammer
test the entire bottom.

C.2.3. b

Measure the depth of pitting and describe the pitting appearance (sharpedged, lake type, dense, scattered, etc.)

See Report.

C.2.3. cMark areas requiring patching or further inspection.

See Report

C.2.3. d

Mark locations for turning coupons for inspection.

OK

C.2.3. eInspect all welds for corrosion and leaks, particularly the shell-to-bottom
weld.

See Report

C.2.3. f

Inspect sketch plates for corrosion.

See Report

C.2.3. g

Locate and mark voids under the bottom.

OK

C.2.3. h

Record bottom data on a layout sketch using the existing bottom plates
as a grid. List the number and sizes of patches required.

See report

C.2.3. i

Vacuum test the bottom lap welds.

Not Performed

C.2.3. j

Hammer test or ultrasonically examine any slightly discolored spots ordamp areas.

OK

C.2.3. k

Check for reinforcing pads under all bottom attached clips, brackets, andsupports

See report

C.2.3. lInspect floating roof leg pads for pitting or cutting, and excessive dimpling(indicating excessive loading).

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Tank 1C.2.3. m

Check the column bases of fixed roof supports for adequate pads andrestraining clips.

See report

C.2.3. n

In earthquake zones 3 and 4, check that roof supports are not welded
down to the tank bottom, but are only restrained from horizontal
movement.

See Report

C.2.3. oCheck area beneath swing line cable for indications of cable cutting or
dragging.

N/A No Swing Line

C.2.3. p

Mark old oil and air test connection for removal and patching.

OK

C.2.3. q

Identify and report low areas on the bottom that do not drain adequately.

OK

C.2.3. r

Inspect coating for holes, disbanding, deterioration, and discoloration.

OK

2.4 SHELL SEAMS AND PLATE
INSPECTION
C.2.4. a

On cone up bottoms, closely inspect and gauge the depth of metal loss
on the lower 2 to 4 inches of the shell (area of standing water).

See Report

C.2.4. b

Measure the depth of pitting on each course.

See Report

C.2.4.c

Inspect and estimate the amount of metal loss on the heads of rivets and
bolts

NA

C.2.4. dInspect shell-to-bottom riveted lap joints.

NA

C.2.4. eInspect for vertical grooving damage from seal assembly protrusions.

No Floating Roof

C.2.4. f

Inspect existing protective coatings for damage, deterioration, anddisbanding

See Report

C.2.4. g

Check for areas of rubbing (indicating too much pressure by the seal
assembly shoes or inadequate annular space).

No Floating Roof

C.2.4.hVisually inspect the shell plates and seams for indications of leakage. If
the shell has riveted or bolted seams, record the leak locations by film or
chart in case the locations are lost during surface preparation for painting

No shell leakage

C.2.4. i

Measure annular space at 40-foot intervals.

NA

C.2.4. j

Survey the shell to check for roundness and plumb.

Visually
Acceptableidenified

2.5 SHELL MOUNTED OVERFLOWSINSPECTION
C.2.5. a

Inspect overflow for corrosion and adequate screening.

OK

C.2.5. b

Check location of overflow that it is not above any tank valves or
equipment.

OK

2.6 ROOF INTERIOR SURFACE
GENERAL
C.2.6.1. a

Visually inspect the underside surface of the roof plates for holes, scalebuildup, and pitting.

C.2.6.1. b

Hammer test or ultrasonically examine to check for thin areas,
particularly in the vapor space of floating roofs and at edge of roof oncone roof tank.

C.2.6.1. c

Check all clips, brackets, braces, etc., welded to the roof deck plate forwelded reinforcing pads and see that they have not broken free.

Visually
Acceptable
UT Acceptable

Visually
Acceptable

C.2.6.1. d

If no pad is present, penetrant test for cracking of the weld or deck plate.

OKC.2.6.1. e

Inspect for protective coating for breaks, disbandment, and deterioration

See Report

C.2.6.1. f

Spark test the interior surface coating if recoating is not planned.

NA

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Tank 1FIXED ROOF SUPPORT STRUCTURE
C.2.6.2. a

Inspect the support columns for thinning in the upper two feet.

NA

C.2.6.2. b

On API columns (two channels welded together) check for corrosion
scale breaking the tack welds, unless the joint between the channels iscompletely seal welded.

NA

C.2.6.2. c

Check that the reinforcing pad on the bottom is seal welded to the tankbottom with horizontal movement restraining clips welded to the pad.

See report.

C.2.6.2. dDetermine if pipe column supports are concrete filled or open pipe. If
open pipe, check for a drain opening in the bottom of the pipeOK

C.2.6.2. eInspect and gauge rafters for thinning, particularly near the center of theroof. Report metal loss.

OK

C.2.6.2. f

Check for loose or twisted rafters.

OK

C.2.6.2. g

Inspect girders for thinning and check that they are attached securely tothe top of the columns.

NA

C.2.6.2. hReport if the columns have cross bracing in the area between the low
pump out of the top of the shell (for future internal floating roof
installation).

OK

C.2.6.2. i

Inspect and report presence of any roof-mounted swing line bumpers.

NA

C.2.6.2. j

Photograph the roof structure if no rafter layout drawing exists.

See Report/Photos

2.7 FIXED ROOF APPURTENANCESINSPECTION AND LIGHT HATCHES
C.2.7.1. a

Inspect the hatches for corrosion, paint and coating failures, holes, andcover sealing.

N/A No Light
Hatches

C.2.7.1. b

On loose covers, check for a safety chain in good condition.

N/A No Light
Hatches

C.2.7.1. c

On light hatches over 30 inches across, check for safety rods

N/A No Light
Hatches

C.2.7.1. dInspect the condition of the gaskets on bold or latched down hatch
covers.

N/A No Light
Hatches

STAGING SUPPORT CONNECTION
C.2.7.2. a

Inspect the condition of the staging support for corrosion.

NA

BREATHERS AND VENTS
C.2.7.3. a
C.2.7.3. b

Inspect and service the breather.
Inspect screens on vents and breathers.

NA
NA

EMERGENCY PV HATCHES
C.2.7.4. a

Inspect and service pressure/vacuum hatches. (Setting should be highenough to prevent chattering of breather during normal operation. See
breather manufacturer's guide,)NA

C.2.7.4. b

Inspect liquid seal hatches for corrosion and proper liquid level in the
seal.

NA

SAMPLE HATCH
C.2.7.5. a

Inspect sample hatch for corrosion.

NA

C.2.7.5. b

Check that the cover operates properlyNA

C.2.7.5. c

If the tank has no gauge well, check for a hold off distance marker andcheck measurement.

NA

2.8 FLOATING ROOF
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Tank 1ROOF DECK
C.2.8.1. a

Hammer test the area between roof rim and shell. (If access forhammer testing is inadequate, measure the distance from the bottomedge of the roof to the corroded area and then hammer test from inside
the pontoon.)

C.2.8.1. b

In sour water service, clean and test all deck plate weld seams forcracking unless the lower laps have been seal welded.

No Floating Roof

Check that either the roof drain is open, or the drain plug in the roof isopen in case of unexpected rain

No Floating Roof

C.2.8.1. c
C.2.8.1. d

On flat bottomed and cone bottom roof decks, check for a vapor dam
around the periphery of the roof. The dam should be continuous
without break to prevent escape of vapors to the seal area from under
the center of the roof.

No Floating RoofNo Floating RoofFLOATING ROOF PONTOONS
C.2.8.2. a

Visually inspect each pontoon for liquid leakage.

No Floating Roof

C.2.8.2. b

Run a light wire through the goose neck vents on locked down
inspection hatch covers to make sure they are open.

No Floating Roof

C.2.8.2. c

Inspect lockdown latches on each cover.

No Floating Roof

C.2.8.2. dCheck and report if each pontoon is:1. Vapor tight (bulkhead seal
welded on one side on bottom, sides, and top), 2. Liquid tight seal
welded on bottom and sides only), or 3. Unacceptable (minimum
acceptable condition is liquid tight).

No Floating RoofFLOATING ROOF CUTOUTS
C.2.8.3. a

Inspect underside of cutouts for mechanical damage.

No Floating Roof

C.2.8.3. b

Inspect welds for cracks.

No Floating Roof

C.2.8.3. c

Inspect plate for thinning, pitting, and erosion.

No Floating Roof

C.2.8.3. d

Measure mixer cutouts and record plate thickness for future mixer
installation or replacement. Plate thickness

No Floating RoofFLOATING ROOF SUPPORTS
C.2.8.4. a

Inspect fixed low and removable high floating roof legs for thinning.

No Floating Roof

C.2.8.4. b

Inspect for notching at bottom of legs for drainage

No Floating Roof

C.2.8.4. c

Inspect for leg buckling or felling at bottom.

No Floating Roof

C.2.8.4. dInspect pin hole in roof guide for tears.

No Floating Roof

C.2.8.4. eCheck plumb of all legs.

No Floating Roof

C.2.8.4. f

Inspect for adequate reinforcing gussets on all legs through a single
portion of the roof.

No Floating Roof

C.2.8.4. g

Inspect the area around the roof legs for cracking if there is no internal
reinforcing pad or if the topside pad is not welded to the deck plate on
the underside.

No Floating Roof

C.2.8.4. h

Inspect the sealing system on the two-position legs and the vapor plugs
in the fixed low leg for deterioration of the gaskets.

C.2.8.4. i

On shell mounted roof supports, check for adequate clearance basedon the maximum floating roof movement as determined by the positionof the roof relative to the gauge well and/or counter rotational device.

No Floating RoofNo Floating Roof

2.9 FLOATING ROOF SEAL ASSEMBLIESPRIMARY SHOE ASSEMBLYAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
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Tank 1C.2.9.1. aRemove four sections of foam log (foam filled seals) for inspection on
90' locations.

No Floating Roof

C.2.9.1. b

Inspect hanger attachment to roof rim for thinning, bending, broken
welds, and wear of pin holes.

No Floating Roof

C.2.9.1. c

Inspect clips welded to roof rim for thinning.

No Floating Roof

C.2.9.1. dShoes-inspect for thinning and holes in shoes.

No Floating Roof

C.2.9.1. e

Inspect for bit-metal bolts, clips, and attachments.

No Floating Roof

C.2.9.1. f

Seal fabric-inspect for deterioration, stiffening, holes, and tears infabric.

No Floating Roof

C.2.9.1. g

Measure length of fabric from top of shoe to roof rim, and check against
maximum anticipated annular space as roof operates.

No Floating Roof

C.2.9.1. h

Inspect any modification of shoes over shell nozzles, mixers, etc., forclearance.

No Floating Roof

C.2.9.1. i

Inspect shoes for damage caused by striking shell nozzles, mixers, etc.

No Floating Roof

PRIMARY TOROIDAL ASSEMBLY
C.2.9.2. a

Inspect seal fabric for wear, deterioration, holes, and tears

No Floating Roof

C.2.9.2. b

Inspect hold down system for buckling or bending.

No Floating Roof

C.2.9.2. c

Inspect foam for liquid absorption and deterioration.

No Floating Roof

RIM MOUNTED SECONDARIES
C.2.9.3. a

Inspect the rim-mounted bolting bar for corrosion and broken welds.

N/A No Secondary
Seal

C.2.9.3. b

Measure and chart seal-to-shell gaps.

N/A No Secondary
Seal

C.2.9.3. c

Visually inspect seal from below, looking for holes as evident by light.

N/A No Secondary
Seal

C.2.9.3. dInspect fabric for deterioration and stiffness.

N/A Wiper

C.2.9.3. eInspect for mechanical damage, corrosion, and wear on tip in contact
with shell

N/A No Secondary
Seal

C.2.9.3. f

Inspect for contact with obstructions above top of shell.

N/A No Secondary
Seal

2.10 FLOATING ROOF APPURTENANCESROOF MANWAYS
C.2.10.1. a

Inspect walls of manways for pitting and thinning.

No Floating Roof

C.2.10.1. b

On tanks with interface autogauges, check seal around gauge tapecable and guide wires through manway cover.

No Floating Roof

C.2.10.1. c

Inspect cover gasket and bolts.

No Floating Roof

RIM VENT
C.2.10.1. a

Check rim vent for pitting and holes

No Floating Roof

C.2.10.2. b

Check vent for condition of screen.

No Floating Roof

C.2.10.2. c

On floating roof tanks where the environmental rules require closing off
the vent, check the vent pipe for corrosion at the pipe-to-rim joint andcheck that the blinding is adequate.

No Floating RoofVACUUM BREAKER, BREATHER TYPE
C.2.10.3. aService and check operation of breather valve.

No Floating Roof

C.2.10.3. b

Check that nozzle pipe projects no more than 1/2 inch below roof deck

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Tank 1VACUUM BREAKER, MECHANICAL TYPE
C.2.10.4.

Inspect the stem for thinning. Measure how far the vacuum breakercover riser is off the pipe when the roof is resting on high or low legs.

No Floating RoofROOF DRAINS: OPEN SYSTEMS, INCLUDING EMERGENCY DRAINS
C.2.10.5.

Check liquid level inside open roof drains for adequate freeboard.
Report if there is insufficient distance between liquid level and top ofdrain.

No Floating Roof

C.2.10.5. b

If tank comes under Air Quality Monitoring District rules, inspect theroof drain vapor plug

No Floating Roof

C.2.10.5. c

If emergency drain is not at the center of the roof, check that there areat least three emergency drains.

No Floating Roof

CLOSED DRAIN SYSTEMS: DRAIN BASINS
C.2.10.6. aInspect for thinning and pitting

No Floating Roof

C.2.10.6. b

Inspect protective coating (topside).

No Floating Roof

C.2.10.6. c

Inspect basin cover or screen for corrosion.

No Floating Roof

C.2.10.6. dTest operation of check valve.

No Floating Roof

C.2.10.6. eCheck for presence of check valve where bottom of basin is below
product level.

No Floating Roof

C.2.10.6. f

Inspect drain basin(s) to roof deck welds for cracking.

No Floating Roof

C.2.10.6. g

Check drain basin(s) outlet pipe for adequate reinforcement to roof
deck (including reinforcing pad).

No Floating Roof

CLOSED DRAIN SYSTEMS: FIXED DRAIN LINE ON TANK BOTTOM
C.2.10.7. aHammer test fixed drain line on tank bottom for thinning andscale/debris plugging.

No Floating Roof

C.2.10.7. b

Inspect supports and reinforcing pads for weld failures and corrosion.

No Floating Roof

C.2.10.7. c

Check that pipe is guided, not rigidly locked to support, to avoid tearingof tank bottom plate.

No Floating Roof

CLOSED DRAIN SYSTEMS: FLEXIBLE PIPE DRAIN
C.2.10.8. a

Inspect for damage to exterior of pipe

No Floating Roof

C.2.10.8. b

Check for obstructions that pipe could catch on.

No Floating Roof

C.2.10.8. c

Inspect shields to protect pipe from snagging.

No Floating Roof

C.2.10.8. dInspect results of hydro-test on flexible roof drain system.

No Floating Roof

CLOSED DRAIN SYSTEMS: ARTICULATED JOINT DRAIN
C.2.10.9. a

Hammer test rigid pipe inflexible joint systems for thinning andscale/debris plugging.

No Floating Roof

C.2.10.9. b

Inspect system for signs of bending or strain.

No Floating Roof

C.2.10.9. c

Inspect results of system hydro test.

No Floating Roof

C.2.10.9. dInspect landing leg and pad.

No Floating RoofAUTOGAUGE SYSTEM AND ALARMS
C.2.10.10. a

Check freedom of movement of tape through autogauge tape guide

No Floating Roof

C.2.10.10. b

Inspect sheaves for freedom of movement.

No Floating Roof

C.2.10.10. c

Test operation checker.

No Floating Roof

C.2.10.10. dInspect tape and tape cable for twisting and fraying.

No Floating RoofAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 13 of 17

Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1C.2.10.10. e

Test the tape's freedom of movement through guide sheaves and tapeguide pipe.

No Floating Roof

C.2.10.10. f

On open-top tanks, check that gate tapes with cables have no morethan one foot of tape exposed with float at lowest point.

No Floating Roof

C.2.10.10. g

Check float for leakage.

No Floating Roof

C.2.10.10. h

Test float guide wire anchors for spring action by pulling on wire andreleasingNo Floating Roof

C.2.10.10. i

Inspect float wells in floating roofs for thinning and pitting of walls justabove the liquid level.

No Floating Roof

C.2.10.10. j

Check that the autogauge tape is firmly attached to the float.

No Floating Roof

C.2.10.10. k

Inspect the tape cable and float guide wire fabric seals through the float
well cover.

No Floating Roof

C.2.10.10. l

Inspect the bottom guide wire attachment clip: inspect for a temporary
weighted bar instead of a permanent welded down clip.

No Floating Roof

C.2.10.10. m

Inspect board-type autogauge indicators for legibility and freedom of
movement of indicator.

No Floating Roof

C.2.10.10. n

Measure and record these distances to determine if seal damage will
occur if tank is run over from: 1. Shell top angle to underside of tapeguide system. 2.Liquid level on floating top to top of secondary seal.

No Floating Roof

C.2.10.10. o

Identify floating roots where the tape is connected directly to the roof.

No Floating Roof

C.2.10.10. p

Overfill alarm: Inspect tank overfill prevention alarm switches for proper
operation.

No Floating Roof

2.11 COMMON TANK APPURTENANCESGAUGE WELL
C.2.11.1. a

Inspect gauge well pipe for thinning at about two-thirds distance above
the bottom: look for thinning at the edge of the slots.

N/A No Gauge
Well

C.2.11.1. b

Check for corrosion on the pipe joint. Check that sample cords,
weights, thermometers, etc., have been removed from the pipe.

N/A No Gauge
Well

C.2.11.1. c

Check for cone at bottom end of pipe about one foot above the bottom.

N/A No Gauge
Well

C.2.11.1. dCheck condition of well washer pipe and that its flared end is directed
at the near side of the hold off pad.

N/A No Gauge
Well

C.2.11.1. eCheck that supports for gauge well are welded to pad or to shell andnot directly to bottom plate,

N/A No Gauge
Well

C.2.11.1. f

Check operation of gauge well cover.

N/A No Gauge
Well

C.2.11.1. g

Check presence of a hold-off distance marker in well pipe and record
hold-off distance.

N/A No Gauge
Well

C.2.11.1. h

Identify and report size and pipe schedule, and whether pipe is solid orslotted. Report slot size.

N/A No Gauge
Well

C.2.11.1. i

Check that the hold-off distance plate is seal welded to the bottom andthat any gauge well supports are welded to the plate and not directly tothe bottom.

N/A No Gauge
Well

C.2.11.1. jInspect vapor control float and cable.

N/A No Gauge
Well

C.2.11.1. k

Check for presence and condition of gauge well washer.

N/A No Gauge
Well

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 14 of 17

Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1C.2.11.1. l

Check for bull plug or plate blind on gauge well washer valve.

N/A No Gauge
Well

C.2.11.1. m

Inspect gauge well guide in floating roof for pitting and thinning.

N/A No Gauge
Well

C.2.11.1. n

Inspect the guide rollers and sliding plates for freedom of movement.

N/A No Gauge
Well

C.2.11.1. oInspect condition of gauge well pipe seal system.

N/A No Gauge
Well

C.2.11.1. p

On black oil and diesel services: if gauge well is also used for sampling,check for presence of a thief- and gauge-type hatch to avoid spillage.

N/A No Gauge
Well

C.2.11.1. q

Visually inspect inside of pipe for pipe weld protrusions which could
catch or damage vapor control float.

N/A No Gauge
Well

SAMPLING SYSTEMS: ROOF SAMPLE HATCHES
C.2.11.2. a

Inspect roof mounted sample hatches for reinforcing pads andcracking.

N/A

C.2.11.2. b

Inspect cover for operation.

N/A

C.2.11.2. c

For tanks complying with Air Quality Monitoring District rules, inspect
sample hatch covers for adequate sealing

C.2.11.2. dCheck horizontal alignment of internal floating roof sample hatches
under fixed roof hatches.

No Floating Roof

C.2.11.2. eInspect the sealing system on the internal floating roof sample hatch
cover.

No Floating Roof

C.2.11.2. f

Inspect floating roof sample hatch cover recoil reel and rope.

No Floating RoofN/ASHELL NOZZLES
C.2.11.3. a

Inspect shell nozzles for thinning and pitting.

See Report

C.2.11.3. b

Inspect hot tap nozzles for trimming of holes.

NA

C.2.11.3. c

Identify type of shell nozzles.

See Report

C.2.11.3. dIdentify and describe internal piping, including elbow up and elbow
down types.

Good

NOZZLES EXTENDED INTO THE TANK
C.2.11.4. a

Inspect pipe support pads welded to tank bottom.

None

C.2.11.4. b

Inspect to see that pipe is free to move along support without strain or
tearing action on bottom plate.

NA

C.2.11.4. c

Inspect nozzle valves for packing leaks and damaged flange faces.

NA

C.2.11.4. dInspect heater stream nozzle flanges and valves for wire cutting.

NA

C.2.11.4. e

Report which nozzles have thermal pressure relief bosses and valves.

None

C.2.11.4. f

In internal elbow-down fill line nozzles, inspect the wear plate on thetank bottom.

NA

C.2.11.4. g

On elbow-up fill lines in floating roof tanks, check that opening isdirected against underside of roof, not against vapor space. InspectNA

impact are for erosion.
DIFFUSERS AND AIR ROLLING SYSTEMS
C.2.11.5. a

Inspect diffuser pipe for erosion and thinning.

N/A No Diffuser

C.2.11.5. b

Check holes in diffuser for excessive wear and enlargement.

N/A No Diffuser

C.2.11.5. c

Inspect diffuser supports for damage and corrosion.

N/A No Diffuser

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 15 of 17

Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1C.2.11.5. dCheck that diffuser supports restrain, not anchor, longitudinal line
movement.

N/A No Diffuser

C.2.11.5. eInspect air spiders on bottom of lube oil tanks for plugging anddamaged or broken threaded joints

N/A No Diffuser

C.2.11.6. aInspect flexible joint for cracks and leaks.

No Swing Line
Present

C.2.11.6. b

Scribe the flexible joint across the two moving faces and raise end ofswing line to check the joint's freedom of movement, indicated byseparation of scribe marks.

No Swing Line
Present

C.2.11.6. c

Check that flexible joints over six inches are supported.

No Swing LineSWING LINES

Present
C.2.11.6. dInspect the swing pipe for deep pitting and weld corrosion.

No Swing Line
Present

C.2.11.6. e

Loosen the vent plugs in the pontoons and listen for a vacuum. Lack ofa vacuum indicates a leaking pontoon.

No Swing Line
Present

C.2.11.6. f

Check the results of air test on pontoons during repairs.

No Swing Line
Present

C.2.11.6. g

Inspect the pontoons for pitting.

No Swing Line
Present

C.2.11.6. h

Inspect the pull-down cable connections to the swing

No Swing Line
Present

C.2.11.6. i

Inspect the condition of the bottom-mounted support, fixed roof limiting
bumper, or shell mounted limiting bumper for wood condition, weld andbolt corrosion, and seal welding to bottom or shell.

No Swing Line
Present

C.2.11.6. j

Inspect safety hold-down chain for corrosion and weak links.

No Swing Line

C.2.11.6. k

Check that there is a welded reinforcing pad where the chain connects
to the bottom.

C.2.11.6. l

If the floating swing in a floating or internal floating roof tank does nothave a limiting device preventing the swing from exceeding 60 degrees,measure and calculate the maximum angle possible with the roof on
overflow. Max. angle on overflow (If the cC.2.11.6. m

Inspect pull down cable for fraying.

No Swing Line
Present

C.2.11.6. n

Inspect for three cable clamps where cable attaches to end of swing
line (single reeved) or to roof assembly (double-reeved). Inspect
sheaves for freedom of movement.

No Swing Line
Present

C.2.11.6. oInspect winch operation and check the height indicator for legibility andaccuracy.

C.2.11.6. p

Inspect bottom-mounted sheave assembly at end of pontoon for
freedom of rotation of sheave.

C.2.11.6. q

Inspect shell-mounted lower sheave assembly for freedom of rotation ofsheave, corrosion thinning, and pitting of sheave housing.

C.2.11.6. r

Inspect upper sheave assembly for freedom of movement of sheave.

No Swing Line
Present

C.2.11.6. s

Inspect the cable counterbalance assembly for corrosion and freedomof operation.

No Swing Line
Present

Present
No Swing Line
Present
No Swing Line
Present

No Swing Line
Present
No Swing Line
Present
No Swing Line
Present

MANWAY HEATER RACKSAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 16 of 17

Date Printed: 10/29/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 1C.2.11.7. a

Inspect the manway heater racks for broken welds and bending of thesliding rails.

No Floating Roof

C.2.11.7. b

Measure and record the length of the heater and length of the track.

No Floating RoofMIXER WEAR PLATES AND DEFLECTOR STANDS
C.2.11.8. a

Inspect bottom and shell plates and deflector stands.

N/A No Mixer

C.2.11.8. b

Inspect for erosion and corrosion on the wear plates. Inspect for
rigidity, structural soundness, corrosion, and erosion of deck plates andreinforcing pads that are seal welded to the bottom under the deflector
stand legs.

N/A No Mixer

C.2.11.8. c

Measure for propeller clearance between the bottom of deflector standand roof when the roof is on low legs.

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 17 of 17

N/A No Mixer

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1SIGNIFICANT PHOTOS

Photo A Disconnected Cathodic
Protection

Photo B Corroded Internal Vertical Ladder
SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 1 of 3

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Photo CNo Fall Arrest System on External Vertical Ladder

Photo D
Damaged Level Gauge

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 2 of 3

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Photo E
Bowing in Roof Rafters

Photo F Through-Hole Corrosion
on RoofSIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 3 of 3

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

GENERAL PHOTOSALL

ACCESS STRUCTURE

No Fall Arrest System on External Vertical
LadderCorroded Internal Vertical Ladder

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 1 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

APPURTENANCES

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 2 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 3 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

BOTTOM

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 4 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

FOUNDATIONGENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 5 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Disconnected Cathodic Protection

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 6 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

Missing Anchor Bolt

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

So Sealant Present on Bottom toFoundation Interface

Page 7 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

GENERAL

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 8 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 9 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1PIPING

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 10 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1ROOF

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 11 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 12 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Damaged Level Gauge

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 13 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Bowing in Roof Rafters

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 14 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 15 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 16 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1Through-Hole Corrosion on RoofSHELL

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 17 of 20

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 18 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 19 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 1 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 20 of 20

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 1

Date Printed: 10/29/19

Appendix C

NDE or UT Report
Report Prepared For

PROJECT MANAGEMENTOFFICEYAP STATE PUBLICSERVICE CORPORATIONYAP STATE, FEDERATEDSTATES OF MICRONESIA
WATER
Tank Number

1
NDE Conducted on

OCTOBER 10, 2019

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1

Appendix C
Shell Thickness UT Table ........................................................................................................................... 3
Bottom Thickness UT Table ........................................................................................................................ 4
Roof Thickness UT Table ............................................................................................................................. 5
Nozzle Thickness UT Table ......................................................................................................................... 6
Equipment Calibration .................................................................................................................................. 7
POWERS Engineering and Inspection, Inc. was contracted by Central Pacific Tank (CPT) to provide NonDestructive Examination (NDE) services for Tank 1 at the Yap State Public Service Corporation in
Colonia, Yap. The services include, Ultrasonic Testing (UT), Visual Examination.
The following equipment was utilized:

Panametrics DL-36 Plus Thickness Gauge sn:992097204
Panametrics DL-36 Plus Thickness Gauge sn:992157166
Panametrics EPOCH III sn:94085612
Standard UT couplant suitable for temp to 300 deg F.
UT thickness probe Panametrics D790 5Mhz sn:602600
UT thickness probe Panametrics D790 5Mhz sn:603918
UT thickness probe FH2E-WR sn:00W6XP
Calibration Block Panametrics 2214E sn:6182
B&W Gas Alert Max XT II Multi-Gas Detector with Pump

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 2 of 7

Date Printed: 12/27/19 12:10 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1SHELL THICKNESS UT TABLE.
UT thickness readings of the butt-welded shell plate were conducted through the coatings utilizing the
Panametrics DL-36 Thickness Gauge in ‘echo to echo’ mode to compensate for the sound path throughthe coatings. UT readings were performed along to circumference of the lower two courses in twelve
vertical locations, see Shell Rollout drawing for location of upper course readings.
D rop
S he ll
Course Loca tion
T op
U ppe r2
Lowe r
Bo ttom
T op
U ppe r1
Lowe r
Bo ttom

D rop

1
0.256
0.247
0.248
0.249
0.248
0.248
0.247
0.250

2
0.247
0.247
0.247
0.247
0.253
0.248
0.249
0.249

3
0.248
0.247
0.247
0.250
0.248
0.248
0.248
0.250

Course 5 S he ll U T R e a ding s T o p to
Bottom
Lo ca tion
R e a ding Course D ista nce (in)
1
5
59
2
5
53
3
5
47
4
5
41
5
5
35
6
5
29
7
5
23
8
5
17
9
5
11
10

5

5

4
0.249
0.247
0.247
0.247
0.252
0.247
0.248
0.248

5
0.249
0.247
0.247
0.248
0.250
0.248
0.247
0.248

6
0.249
0.247
0.247
0.248
0.250
0.247
0.249
0.250

D ro p

7
0.249
0.247
0.248
0.247
0.255
0.248
0.251
0.248

Course 4 S he ll U T R e a ding s T op to
BottomLoca tion

8
0.247
0.247
0.248
0.248
0.251
0.247
0.247
0.250

9
0.247
0.247
0.248
0.247
0.248
0.248
0.249
0.248

10
0.252
0.247
0.247
0.247
0.247
0.248
0.248
0.249

11
0.248
0.247
0.247
0.247
0.248
0.248
0.252
0.249

Course 3 S he ll U T R e a dings T op to
Bottom
Lo ca tion

U T (in) R e a ding Course D ista nce (in)
0.247
1
4
59
0.250
2
4
53
0.247
3
4
47
0.250
4
4
41
0.248
5
4
35
0.247
6
4
29
0.248
7
4
23
0.248
8
4
17
0.248
9
4
11

U T (in) R e a ding Course D ista nce (in)
0.249
1
3
59
0.251
2
3
53
0.249
3
3
47
0.247
4
3
41
0.252
5
3
35
0.249
6
3
29
0.247
7
3
23
0.249
8
3
17
0.251
9
3
11

U T (in)
0.250
0.251
0.249
0.248
0.253
0.247
0.250
0.248
0.250

0.249

0.258

0.255

10

4

5

10

3

5

Co urse 6 S he ll U T R e a dings T op to
Bo tto m
Lo ca tio n
R e a ding Co urse D ista nce (in)
1
6
44
2
6
38
3
6
32
4
6
26
5
6
20
6
6
14
7
6
8
8
6
2

Appendix C – Tank 20106© 2019 PE&I Inc.

12
0.248
0.247
0.248
0.249
0.252
0.247
0.248
0.248

U T (in)
0.247
0.252
0.248
0.248
0.255
0.249
0.247
0.252

Page 3 of 7

Date Printed: 12/27/19 12:10 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1

BOTTOM THICKNESS UT TABLE
Systematic bottom UT measurements were difficult to obtain through the rough surface of the bottom
coatings. UT readings were conducted in a formation of eight radial lines (see Bottom Layout) with 10
measurements recorded per radial line.

R e a ding
1
2
3
4
5
6
7
8
9
10

Appendix C – Tank 20106© 2019 PE&I Inc.

1
0.243
0.248
0.241
0.246
0.244
0.247
0.241
0.246
0.247
0.245

Bottom U T T hickne ss R e a ding s (in)R a dia l S ta tion
2
3
4
5
6
0.242
0.247
0.244
0.246
0.241
0.248
0.249
0.241
0.247
0.243
0.246
0.245
0.244
0.244
0.245
0.245
0.248
0.249
0.243
0.241
0.241
0.243
0.241
0.246
0.243
0.244
0.242
0.245
0.244
0.244
0.241
0.242
0.243
0.248
0.243
0.243
0.242
0.249
0.244
0.241
0.241
0.241
0.243
0.245
0.247
0.244
0.246
0.248
0.241
0.247

Page 4 of 7

7
0.249
0.245
0.246
0.243
0.243
0.249
0.246
0.248
0.248
0.241

8
0.241
0.247
0.244
0.248
0.247
0.249
0.242
0.245
0.248
0.246

Date Printed: 12/27/19 12:10 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1ROOF THICKNESS UT TABLE
Random UT thickness readings of the 3/16-in nominal lap-welded cone roof plates were conductedutilizing the Panametrics DL-36 Thickness Gauge in ‘echo to echo’ mode to compensate for the soundpath through the coatings. Due to limited safe access at the time of inspection UT reading wereconducted from a manlift near the roof manway (see Cone Roof Layout).

P la te1
98

Appendix C – Tank 20106© 2019 PE&I Inc.

R oof U T T hickne ss R e a ding (in)
1
2
3
4
0.180
0.176
0.186
0.184
0.180
0.180
0.180
0.180
0.177
0.182
-

Page 5 of 7

5
0.186
0.180
-

Date Printed: 12/27/19 12:10 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1NOZZLE THICKNESS UT TABLE
Tank Shell Nozzle & Appurtenances Table with Geometry API 650 and Weld Spacing Check API 653

20

53

0.25

>=
49.5
Ok
18
<
19
Not Ok

>=
0.247
Ok
0.25
>=
0.247
Ok

A

OK

Ok

A

OK

Some of the repad geometry or w eld spacings is less than required.
Because, these items have most likely been in service during a hydrotest, or in low temp service, API 653 w ould consider the brittle
f racture risk low and theref ore, no action is req'd.

Comments

0.247

63
>=
60
Ok
22
<
23.25
Not OkDoes Repad meetrequirements of
API 650 5.7.2?

8

0.750
>=
A
0.1875
Ok
0.313
<
A
0.5
Not Okre f AP I 650 tbl 5-6b

Weld Detail nozzle
neck
to shell and repad

Nozzle

0.750
0.754
0.751
0.751
0.313
0.318
0.325
0.326

>=
29
Ok
24.00
<
13.75
Ok

Repad Thickness (in)

B

38.00

Height (in)26

Width (in)

0.247

Repad

Shape

24

Min, API 650, OK?

Bottom of Nozzle to
BottomManwayField UT Data
top, bottom, left andright

Course Thickness (in)A

Nozzle Thickness (in)Nozzle Centerline to
BottomDescription

Diameter (in)Nozzle Height (in)

Item

Shell

© POW ER S Enginee ring and I nspe ction, I nc . 2 01 9

AP I 650 5.7.2

REPAD
WIDTH

shell

W IDTH

DIAMET ER

repadnozzleREPA D
HEIGH TNOZ ZLEHEIGHTAPIAPI SQDIAMOND

DOG

API
DOG

OVAL

SQ

DOOR

SQ RND

A

B

C

D

E

F

G

H

I

A

B

C

LOC ATION

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 6 of 7

Date Printed: 12/27/19 12:10 PMJNOZZLE WELD DETAILSNDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 1EQUIPMENT CALIBRATION
Date
October 10, 2019
(Daily Calibration)

Equipment
Panametrics DL-36 Plus
Thickness Gauge

October 10, 2019
(Daily Calibration)

B&W Gas Alert Max XT
II Multi-Gas Detector

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 7 of 7

Calibration Tool
Calibration using 5-step
block (0.1, 0.2, 0.3, 0.4,
0.5-in) in accordancewith ASTM E 797-05.
Calibration performed inaccordance with PEI
NDE Manual.
Bump tested prior toeach use. Calibration
performed using CH4
Calibration Gas BW
CG-Q34-4

Calibrated By
GPGP

Date Printed: 12/27/19 12:10 PM

Appendix 3

TANK 2 AWWA D101-53 INTERNAL/OUTOF-SERVICE TANK INSPECTION
Yap State Public Service Corporation (YSPSC),
Colonia, Yap
Report Prepared for:Project Management Office
Yap State, Federated States of Micronesia
Yap State Public Service Corporation
Yap State, Federated States of Micronesia
Contract/Task Order Number:Contract: C 231202 2019-192
Report Prepared by:Powers Engineering and Inspection, Inc. (PEI)
under subcontract to:Central Pacific Tanks, Inc.
P.O. Box 5213
Kaneohe, Hawaii 96744 USA
Inspected on:

October 2, 2019
Construction andInspection History:
Constructed

Bottom1971

External Inspection

Internal Inspection

1971

October 2019

October 2019

October 2019

Next Inspection:

See Report

See Report

See Report

Report Revisions:
Rev 1
Rev 2
Rev 3
Rev 4

October 29, 2019
November 5, 2019
November 8, 2019
December 27, 2019

Revised Executive Summary Item 1.g.
Minor Revision
Revised Executive Summary Item 4.d.
Revised per Customer Comments

Inspector/Reporting:

Under Advisement of:

Dylan Macy
Inspector / Project Engineer
dylanmacy@powersei.com(707) 301-7743

Gary W. Powers, P.E.
President / Inspector
gowers@powersei.com(707) 334-3400

API 653 Authorized Inspector 64969
STI SP001 AST-T10391
ASNT Corporate Level II UT, PT, MT and VT

API 653 Authorized Inspector 0691
API 570 Authorized Inspector 22744
API 510 Authorized Inspector 24231
ASNT Corporate Level III UT, PT, MT and VT
California Civil PE 60589

UT Inspection

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2
Table of Contents
Executive Summary ......................................................................................................................... 2
AWWA D101-53 Compliance .......................................................................................................... 6
Action Items ................................................................................................................................. 6
Consider Items ............................................................................................................................. 7
Monitor Items ............................................................................................................................... 7
Basic Tank Information .................................................................................................................... 8
Shell Settlement Survey .................................................................................................................. 9
Shell Thickness Calculation ........................................................................................................... 10
Shell Corrosion Rate Calculation ................................................................................................... 11
Shell Rollout (cont.) ....................................................................................................................... 13
Bottom Layout ................................................................................................................................ 14
Cone Roof Layout .......................................................................................................................... 15
Next Inspection Calculation ........................................................................................................... 16
Seismic Calculation ....................................................................................................................... 17
API 2000 Venting Calculations ...................................................................................................... 18
Appendix A
API 653 Inspection APP C Checklists
Appendix B
Significant Photos
General Photos
Appendix C
Non-Destructive Examination (NDE) UT Report

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 1 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2EXECUTIVE SUMMARY
Powers Engineering and Inspection Inc. was contracted by Central Pacific Tank (CPT) to provide
AWWA D101-53 Internal Inspection services for Tank 2 at the Yap State Public Service Corporationin Colonia, Yap.
Tank 2 was originally engineered and designed in 1971 by Sunn, Low, Tom & Hara Inc. The tankis an 80-ft diameter x 29-ft tall tank with a supported steel cone roof, butt-welded shell, and a 1/4in butt-welded bottom. The tank was most recently in Potable Water service.
The report and executive summary are based on field inspection and evaluation in accordance with
AWWA D101-53 and API 653 Standards. Before the tank is returned to service all the requirementsof AWWA D101-53 should be met.
Inspection
Goal
1. Identify any
current leakpaths
resultingfromcorrosion,internal orexternal.

Methods
Employed
100% Visual
Inspection (VT)of corner weld
and all bottom
welds for defects
or corrosion
100% Visual
Inspection (VT)of base of tank,bottom extension
and shell for
corrosion,
product stains orother signs of
product seepage.
Utilize
Ultrasonic
Testing (UT) to
find areas ofpotential thinningor corrosion loss
from internal
corrosion.
Document with
Digital Camera

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Results
a. Utilizing the AWWA D101-53 and Manual M42 Chapter 9
guidelines for periodic inspections along with API 653 MRT
method for calculation of period to next inspection, the next
formal AWWA Internal Inspection can be extended 3 to 5 years
or as required by state regulatory agencies. The following
Executive Summary and Action Items lists repairs that should be
performed during the next planned outage.
b. The coatings on the 1/4-in thick bottom plates and internal shellwere noted to be ending or have surpassed it’s intended lifespanwith the most notable degraded locations being the lower 9-ft of
the internal shell plate, internal corner weld, and bottom platebutt-welds. Photo A Photo J
c. An MFL scan of the tank bottom was not performed during theinspection. Due to the extent of coating failure, disconnection of
the cathodic protection system Photo G, and unknown extent ofsoil sidecorrosion, the 1/4-in bottom should be replaced.
d. As internal coating is an important factor in protecting interior
surfaces from corrosion in water storage tanks, the new bottom
plates, shell plates, and roof structure should have a new internalcoating installed that meets AWWA D102 and NSF/ANSI 61
requirements.
e. The current cathodic protection system consists of (6) sacrificeanodes with only one anode currently connected to the tank. Thissystem was installed during the initial tank construction in 1971
and has not been properly maintained. The cathodic protection
system should be replaced with an API 651 compliant CP
system, and a reference anode pipe should be installed
underneath the bottom while the bottom plate is being replaced.
f. The lower 9-ft of internal shell and lowest internal stiffening ringis experiencing widespread pitting corrosion with the deepest piton the 0.25-in shell plate being 0.16-in deep. A total of thirty-six(36) areas on the shell that have been marked for repair. The pits
in these marked areas should be repaired by puddle welding andground flush with the shell plate after welding. If additional pitting
is identified during sandblasting, further evaluation of the pitting
should be performed. Photo C Photo D Photo J2
g. In addition to the shell plate, the center column was also
experiencing pitting corrosion with deepest pit of the 0.325-in wallbeing measured at 0.13-in deep. Due to the extent of the pitting
was well as unidentifiable internal pipe corrosion of the center
column, a “clam shell” should be installed around existing center
column. The clam shell shall consist of two halves of pipe that are
Page 2 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2

2. Identify any
risk areas for
future leakpathdevelopment

Utilize
Ultrasonic
Testing (UT) to
find areas ofpotential thinningor corrosion loss
from internal
corrosion.
Documentationof any brittle
fracture concerns
including nozzle
weld spacing.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

seal welded on both sides in order to provide additional support
to the corroded center while also protecting it from further
corrosion. Photo K
h. Extensive pitting corrosion was also identified in the internal neckof the 24-in manway. During the time of bottom replacement, thedoorsheet should be cut into the shell at the existing 24-in
manway’s location. This section of the shell should be replacedwith new shell plate after bottom repairs are complete and a new
30-in shell manway should be installed. Photo H
i. API 653 minimum shell thickness calculations were performed
and determined that the maximum height of product for the 1/4in first shell course is 26-ft. As the bell-mouth of the 8-in overflow
is located 28-ft above the bottom, special consideration should
be made to limit the maximum fill height to 26-ft or lower the
opening of the overflow to a maximum height of 26-ft.
j. Consideration should also be made to lowering the fill heights to
reduce the risk of sloshing damage during a strong seismic event.
a. Wear plate is currently not installed underneath the center
column base structure (crow’s foot). This creates an area ofthebottom plate that is not able to be inspected. Install a 1/4-inthick wear plate underneath the crow’s foot that is lap-welded tothe bottom plate, after the bottom plate is replaced. Do not weld
crow’s foot to the new wear plate. Install four (4) angle ironclips around crow’s foot to limit horizontal movement. Photo E
b. There is currently an abandoned and corroded automated tankgauge bottom attachment welded directly to the bottom plate.
After the bottom replacement is completed and a new level gauge
is installed, install a 1/4-in repad underneath the new level gauge
tank bottom bracket. Photo M
c. The tank bottom to foundation currently does not have a caulking
installed, allowing for water intrusion underneath the bottom aswell as increasing the risk of knife edge corrosion to occur on thebottom extension. After the bottom is replaced, install a flexible
caulking system around 100% of the bottom extension to
foundation interface.
d. The current anchoring system is an anchor bolt going through thebottom extension. Consider installing API 650 compliant anchor
chairs on the shell in order to adequately distribute seismic
loading to the shell rather than the bottom extension in the eventof seismic activity.
e. There is currently an anchor missing on the tank opposite of the
24-in manway. Replace the missing anchor bolt like-in-kind anduse an anchoring adhesive engineered for the calculated pull-out
strength of the anchors. Photo N
f. The shell reinforcing pads on the (2) 8-in nozzles and 24-in
manway do not have “tell-tales” installed in order to adequately
detect a leak in the shell behind the repads. Consider installing
API 650 compliant tell-tales in the repads in order to detect thepresence leaks.
g. Isolated nozzle, bottom repad, and shell repad geometry,spacings, and thickness were found to be below API 650
requirements. As these components, have been operating inservice at max capacity, no corrective action is required, andbrittle fracture risk is minimal. Monitor nozzles for signs of stressinduced damages along the shell to determine if corrective action
is needed in the future.
h. UT scrubs were performed in (8) radial lines around the tank fromthe shell to the center column. The lowest remaining thickness
measured with this technique on the 0.25-in thick bottom plates
was 0.228-in.
Page 3 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2

3. Foundation
settlement

4. Accessstructures

Survey of theshell forsettlement.
VT shell forbulges,distortion, orother verticality
issues.
Through visual
examination (VT)of accessstructure to
determine its
condition.

5. Cone Roof

VT of steel roof
deck and coating
UT ofcomponents androof deck

6. Venting

VT of existing
venting system

7. Coatings

VT of coatings

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

i. Visual inspection of the shell plate was performed to identify
product side corrosion with the only areas of corrosion being thelower 9-ft of the shell as discussed earlier. UT scrubs were
performed along the top two courses via manlift with noidentifiable corrosion being present.
a. The maximum out-of-plane settlement was approximately 4-in,
which is within acceptable limits of API 653 Appendix B
calculations for differential settlement. See survey results.
b. The shell was inspected for verticality and distortion. No
significant distortion was identified.
c. The seismic loads were calculated utilizing the latest API 650
Appendix E (ASCE 7/ IBC 2009 methods). The risk of damage
from a seismic event is minimal for all fill heights.
a. The internal vertical ladder is corroded beyond use and repair.
Replace the internal vertical ladder with a permanent fall arrest
system compliant with OSHA Subpart D installed on the ladderor an anchor point for a portable fall arrest system installed on or
above the existing 24-in roof manway. Photo I
b. The cone roof is accessed via vertical ladder on the tank shell.
The vertical ladder is currently in good condition with minor
coating failure. The vertical ladder is also over 24-ft tall without afall arrest system installed. Install an OSHA Subpart D compliant
fall arrest system on the external vertical ladder. Photo L
c. The roof handrails near the vertical ladder appear to be in goodcondition with minor corrosion and coating failure.
d. The tank currently does not have system in place such as a fence
and locked gate to limit access to the tank.
a. The center column crow’s foot is experiencing corrosion
throughout its W-beam support members and bearing plate.
Replace the corroded center column crow’s foot with like-in-kindmaterials as well as like-in-kind welding techniques. Photo F
b. During inspection it was noted that the roof rafters areexperiencing minor bowing most likely due to seismic activity.
The roof rafters are currently not twisting indicating that rafters
are not experiencing lateral torsional buckling. Monitor
rafter condition during the next formal internalinspection todetermine if the rafter conditions have worsened. Photo B
c. The 3/16-in roof deck appears to be in generally good condition
with no significant corrosion being identified visually or with UT
scrubs performed on the roof plate.
d. There are indications of a significant amount of localized watercollection areas depressions, known as “bird baths.” If the roof
coating is not replaced, these bird baths will eventually lead tothrough-hole corrosion once the roof’s bare steel is exposed.
a. The tank is vented with an 18-in open center vent while the tankis serviced with 8-in nozzles. API 2000 venting calculations
indicate that the venting configuration is adequate.
b. Coating failure and minor corrosion is present on the center vent.
a. As mentioned in the beginning of the Executive Summary, theinternal linings appear to have surpassed their intended lifespanand are now experiencing flaking and general wear leading toexposed steel. The new bottom plates, shell plates, and roof
structure should have a new internal coating installed that meets
AWWA D102 and NSF/ANSI 61 requirements after all repairs arecomplete.
b. The external shell plate, shell appurtenances, vertical ladder, andcone roof plate coatings are all experiencing coating failure in theform of worn and flaking coatings. Due to the tropical climate,corrosion of exposed steel will be higher than normal for these

Page 4 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2tanks. It is strongly recommended that all external coatings
should be replaced.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 5 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2AWWA D101-53 COMPLIANCE
It is the best opinion of the Inspector that Tank 2
complies with the AWWA D101-53 and Manual
M42 standard if the following Action Items areproperly addressed:

ACTION ITEMS
1. Utilizing the AWWA D101-53 and Manual
M42 Chapter 9 guidelines for periodic
inspections along with API 653 MRT
method for calculation of period to next inspection, the next formal AWWA Internal
Inspection can be extended 3 to 5 years or as required by state regulatory agencies.
Note: The action item repairs listed below can be performed at that time.
2. Replace the existing 1/4-in butt-welded bottom with a new 1/4-in lap-welded bottom.
3. API 653 Minimum Shell Thickness calculations indicate that the maximum allowable heightof product for the tank is 26-ft. Limit the maximum fill height of water to 26-ft or modify the
overflow piping to have a maximum height of 26-ft.
4. Restore or replace the cathodic protection system with an API 651 compliant cathodic
protection system. The current system is a “1970’s era anode bed sacrificial cathodic
protection system that has not been properly maintained with only one anode connectedto the tank.
5. Install new internal coatings including bottom, shell, roof column and crow’s foot, andinternal shell stiffeners to prevent further internal corrosion. Preliminary coating tests
identified that the existing coatings do not contain lead or chromate, but a formal testing of
the coatings should be complete prior to sandblasting.
6. The lower 9-ft of shell plate and shell plate butt-welds are experiencing product side pittingwith the deepest pit measured of 0.16-in. Perform thirty-six (36) puddle weld and butt-weld
repairs on the marked areas of shell plate and shell plate butt-weld pitting with a pit depth
greater than 0.09-in.
7. Remove the existing 24-in shell manway during the bottom replacement process and installa new 30-in shell manway after the repairs are complete.
8. Install a “clam shell” around the existing 8-in center column. The clam shell shall consist of
two halves of a pipe that are seal welded on both sides in order to provide additional
support to the corroded center column while also protecting it from further corrosion.
9. Replace the corroded center column base structure (crows’ foot) like-in-kind.
10. Install a wear plate underneath the center column crows’ foot with seismic clips to allow forslight vertical movement of the center column while restraining from lateral movement. Do
not weld the crows’ foot to the wear plate.
11. Replace the missing anchor bolt on the opposite side of the tank from the existing 24-inshell manway.
12. Replace or remove the corroded internal vertical ladder.
AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 6 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2
13. The vertical ladder providing access to the cone roof is over 24-ft tall with no fall arrest
system. Install an OSHA compliant fall arrest system on the vertical ladder.
14. Install a new automatic tank level gauge on the tank with a 1/4-in thick repad installed
underneath the new tank bottom bracket.

In addition to the above required Action Items, the following are listed for Consideration andMonitoring:

CONSIDER ITEMS
1. Consider lowering the fill height to reduce the risk of sloshing damage during a strong
seismic event.
2. Consider installing API 650 compliant anchor chairs on the shell in order to adequately
distribute seismic loading to the shell rather than the bottom extension in the event ofseismic activity.
3. Consider recoating the external shell and roof.
4. Consider installing API 650 compliant “tell-tales” on the shell appurtenance repads in orderto detect the presence of leaks.
5. Consider installing sealant around the bottom extension to foundation interface to mitigate
water intrusion underneath the bottom which could lead to soil side corrosion.
6. Consider adding fenced enclosure to the tank area for security.

MONITOR ITEMS
1. Monitor the coatings and apply touch-up as needed.
2. The roof rafters are experiencing minor bowing most likely due to seismic activity. The roof
rafters are currently not twisting indicating the rafters are not experiencing lateral torsional
buckling. Monitor the condition of the roof rafters during the next internal inspection todetermine if the rafter conditions have worsened.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 7 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 2BASIC TANK INFORMATION
Tank Number:
TANK 2

Product:

Owner:

Location:

YAP STATE PUBLICSERVICE CORPORATIONCOLONIA, YAP,FEDERATED STATES OFMICRONESIA

Diameter (ft):Height (ft):

POTABLE WATER

29

Year Built:

BUTT-WELDED W/CONE ROOF

BUTT-WELDED
Cone Roof Access:
UNCAGED VERTICALLADDER
Pumping Rate:
UNKNOWN
Leak Detection:--

Capacity (gal):

80

Type Tank:

Type Shell:

Unit/Zone/Area:

1971

Design Standard:
AWWA

733,950
Engineer/Designer:
SUNN, LOW, TOM & HARA INC.

Type Roof:Type Foundation:

SUPPORTED CONE ROOF

CONCRETE RINGWALL

Floating Roof Access:

Roof Vents:

NA

Suction Line:
1: 8-IN
Secondary Containment:

Type Bottom:
1/4-IN BUTT-WELDED
Roof Manways:

1: 18-IN OPEN VENT

Receipt:

1: 24-IN

Shell Manways:
1: 8-IN

1: 24-IN

Cathodic Protection:

Insulation:

NONE

N/A

Shell Coatings:

Floating Roof Coatings:

Bottom Coating:

YES

NA

YES

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

SACRIFICIAL ANODE

Page 8 of 18

NONE

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2SHELL SETTLEMENT SURVEY

The settlement for the tank is planer or roughly approximates the shape of a cosine
curve.
The evaluation of this “out-of-levelness” or settlement, utilizing the criterion for “out-ofplane distortion” as described in API 653 Appendix B.3.2, indicates that the settlement iswell within the acceptable limits.

Applicable Standards:
Shell settlement surveys were conducted in accordance with the requirements of API 653
Figure B-1. These surveys were evaluated in accordance with the API 653 Appendix
B.2.2 and compared with the acceptance criteria outlined in API 653 Appendix B.3.2.
Note:
Calculation of maximum permissible S or out-of-plane distortion per API 653 Appendix
B.3.2 was made using:

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 9 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2SHELL THICKNESS CALCULATION
Shell Thickness Calculations per API 653 4.3.3.1

F ind:© POWERS Engineering and Inspection, Inc. 2019

M inimum she ll thickne ss (t min) fo r e a ch she ll course utilizing the AP I 653 sta nda rd fo r ta nks le ss tha n 200 ft d ia .

Give n:Varia ble I de ntifier

H
D
G
S
E
M

1.00

S o lutio n:

D esc ription

Value

Re fe re nce

Fill he ig ht (ft) 26.00 M e a sure d from the ba se of e a ch she ll co urse (se e column H in the ta b le b e lo w)
T a nk D ia me te r (ft) 80.00
S p e cific Gra vity
1.00
Allo w stre ss (p si) V a rie s R e fe re nce AP I 653 T a b le 4-1
Joint E fficie ncy V a rie s R e fe re nce AP I 653 ta b le 4.2 fo r W e ld e d a nd 4.3 fo r R ive te d constructio n
T e mp M o d ifie r V a rie s R e fe re nce AP I 650 App e nd ix M E le va te d te mpe ra ture mo difie r
1stCo urse S tress (p si) = (g *2.6(D(H-1)/ t) = 20,800 (p si)
T a ble fo r Ca lcula ting minimum she ll thickne ss (t min) fo r e a ch she ll co urse

H
C
o
u
r
s
e

Produc t
H eight
Above
CourseH eight of e ach
Course
(in)

(ft)

E

T ype of
Joint foreach Course(ft)

Joint Eff
API 653
T bl 4. 2
a nd 4. 3

S

Ma te rial T ype
or U nknown
W elded or R iv eted%

Maximum
Allowable
Stress

API 65 3 Re quire d Calculationt m in =(psi)

2.6 ( H - 1) DG
SEM

API 653 4. 3. 3. 1

ActualSolution

Req'd
t min

Minimum
T hickne ss
for Course

(in)

(in)

OK?

0.24590.2500Ok

0.19670.2500Ok

0.13410.2500Ok

0.10000.2500Ok

0.10000.2500Ok

0.10000.2500Ok

ActualVs
R eq'd

2.6 x ( 26.00 - 1 ) x 80.00 x 1.00
1

60.00

5

26.00

85% Butt W e ld

0.85

A 36

24,882( 24,882 x 0.85 x 1.00)

2

60.00

5

21.00

85% Butt W e ld

0.85

A 36

24,882

2.6 x ( 21.00 - 1 ) x 80.00 x 1.00
( 24,882 x 0.85 x 1.00)

3

60.00

5

16.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 16.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

4

60.00

5

11.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 11.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

5

60.00

5

6.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 6.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

6

45.00

3.75

1.00

85% Butt W e ld

0.85

A 36

27,3762.6 x ( 1.00 - 1 ) x 80.00 x 1.00
( 27,376 x 0.85 x 1.00)

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 10 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 2SHELL CORROSION RATE CALCULATION
Shell Corrosion Rate Calculations API 653 6.3; Widely Scattered Pits

© POWERS Engineering and Inspection, Inc. 2019D a te(s)A

I nspec tion Ye ar

B

T hick ne ss

N
Corrosion R a te(s)Calc ulate d

CourseMea suredYear
B uilt o r R e pla c e d

Pre v

Curre nt

As Built

Prev

Currentt min

Prev ious

(yr)

(yr)

(yr)

(in)

(in)

(in)

(in)

(in/ yr)(in/ yr)

1
2
3
4
5
6

1971
1971
1971
1971
1971
1971

1971
1971
1971
1971
1971
1971

2019
2019
2019
2019
2019
2019

0.250
0.250
0.250
0.250
0.250
0.250

0.250
0.250
0.250
0.250
0.250
0.250

0.070
0.110
0.242
0.240
0.244
0.243

0.123
0.098
0.067
0.050
0.050
0.050

N/A
N/A
N/A
N/A
N/A
N/A

0.00380.00290.00020.00020.00010.0001

Current

R CA
API 65 3
6 .3 . 2. 1
(A-B)
(in)

(0.0529)0.01170.17500.19000.19400.1930minimum:

RCA = The difference between the measured thickness and the minimum required thickness (in per year are used in this calculation) ref API 653 6.3.2.1
Per API 653 Section 4.3.2.2 a), no pit depth results in the remaining shell thickness being less than one-half the minimum acceptable tank shell
thickness exclusive of the corrosion allowance*Note: Next External API 653 and UT Inspection calculation(s) not applicable because the tank will be coated inside reducing the corrosion rate to 0.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 11 of 18

Date Printed: 12/27/19 11:07 AM

R CA/ 4 N
N e xtExte rnal
API 65 3
6. 3 .2(yr)-3.53*
1.00*
5.00
5.00
5.00
5.00
5.00

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2
Shell Rollout

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 12 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2SHELL ROLLOUT (CONT.)AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 13 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 2

BOTTOM LAYOUT(8x) ULTRASONIC THICKNESS SCRUBSPERFORMED ON BOTTOM PLATE
24-IN MANWAYINSTALL NEW 30-IN MANWAY

8-IN UNDER BOTTOM SUCTIONLEVEL GAUGE
1

7

8

18

17

29

28

54

15

14 13

SHELL PLATE/SHELL PLATE
BUTT-WELD REPAIR

22 23

27

26

33

25 24

34 35

36

40
39

44

53

VERTICAL LADDERREPLACE CORRODED LADDER
11 12

21

32

43

5 4

10

20

31

BOTTOM WELD
CORROSION

16

8-IN CENTER COLUMN w/ 76-IN x 96-IN CROWS FOOTREPLACE C8 CROWS FOOT BASE LIKE IN KIND
INSTALL 1/4-IN THK WEAR PLATE BENEATH CROWS FOOT

42

6

9

19

30

BOTTOM WELD
CORROSION

2 3

45

38 37

46 47

52

51

48

8-IN NOZZLE
1-IN NOZZLE

50 49

55

61
56

67

57 58

66

68

59 60

65

69

64

70

63 62

71 72

78

73
77

76

75 74

79

83
80
87

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

81 82
86

85 84

Page 14 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 2

CONE ROOF LAYOUT
1

2

9

3

4 5

8

7 6
14

VERTICAL LADDERNO FALL ARREST SYSTEM
24-IN MANWAY

10

11

12

20

13

18

17

16 15

1
9
21

31

22

23

30

24 25

29

RANDOM ULTRASONIC THICKNESSSCRUBS PERFORMED ON ROOF
PLATE

27 26
2

8

32

33

34

35

36 37

38

42

18-IN OPEN VENT
44

41

40 39

4
3

45

46

57

47

48

56

49 50

55

54

51

53 52

58

64
59

70

60 61

62 63

69

68

66 65
6

7

71

72

73

74 75

81

76
80

79

78

82

77
86

83
91

90

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

89

84 85
88 87

Page 15 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2

NEXT INSPECTION CALCULATION
The tank bottom will be replaced. It is the best opinion of the Inspector that the bottom has a remaining life of 2-3 years until a leak occurs.
Periodic monitoring of the tank bottom for a leak should be performed until the bottom is replaced.

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 16 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
COLONIA, YAPPROJECT MANAGEMENT OFFICE

Tank 2SEISMIC CALCULATION
Seismic Design per API 650 11th Appendix E© POWERS Engineering and Inspection, Inc. 2019

Find: P roduct fill he ig ht for se ismic loa d ing utilizing AP I 650 12th e ditio n Ap pe nd ix E M e thod olog y
Give n:
T a nk N umb e r:2

T ype R oo f 3 Cone R o of with no Inte rna l Flo a ting R o ofT a nk (D )ia me te r (ft)T a nk (H )e ight o r le ngth for H orizo nta l T a nk (ft)S e ismic P rod uct fill H e ig ht (ft)S p e cific (G)ra vity
E le va tio n of ta nk bo tto m a bo ve g ra de (ft)

80.00
29.00
26.00
1.00
0.66667

Loca tion:

9.514400
138.129400

La titud e (de g )Longitud e (de g )H fill26 (ft) Operational

Ss
S1
So

0.79
0.31
0.314

78.60%U S GS o r U FC 3-101 -1 tb l F -2
31.40%U S GS o r U FC 3-101 -1 tb l F -2
= S s*0.4 fo r M a pp e d M e tho ds

Fa
Fv

1.186
1.77

AP I 650 T a ble E -1
AP I 650 T a ble E -2

R e g io na l-d e pe nd a nt tra nsitio n pe rio d
TL
S m1=F v*S 1
U se Group Impo rta nce Fa ctor (AP I 650 T b l E -5)
S ite S oil Cla ssifica tionS e ismic U se Gro up

0.5564
1
D S tiff S oil
I

AS CE 7 ma ps

T hickne ss of Bo tto m unde r the she ll (in)M in R e q'd T hickne ss o f Botto m unde r she ll (in)Ca lc'd 23.43 W idth of Annula r P la te (in)AP I 650 Appe nd ix M T e me p ra ture M o difie r
Y ie ld o f Bo tto m U nde r S he ll (p si)
Y ie ld of 1st she ll co urse (p si)

0.25000.10001.95
1.00
30,00036,000S pe ctra l R e spo nse Fa ctors

S ite Co e fficie nts(p si)
M od ulus of E la sticity (p si)
W e ight p e r Cubic ft o f M a te ria l (p cf)
S no w Lo a d (p sf)
3-se c Gust D e sign W ind V e lo city (mph)V a rie s from 4 to 16

T a b le E -3 AP I 650 IBC 2009 ta b le 1613.5.2
SU I or I
U se : gro up IV M ilita ry III e sse ntia l, II p ub lic risk, or I
tb
AP I 653
L
AP I 650 Ap pe ndix E .6.2.1.1.1
Tm
F by
F yie ld 1st Co urse

24,88229,000,000
Steel
10

Sd
E

100

V

490 pcf
IBC 1608.4 o r U FC 3-101 -1 tb l F -1
IBC 2009 fig 1609 or U FC 3-101 -1 tb l F -1

Solution:
AP I 650 12th App e ndix E Ca lcula tions for La t 9.51440 a nd Long 138.12940
Seismic Overturning or Uplift Risk w/o Anchors?

No Seismic uplift is expected for fill heights < 26.00 (ft)Compressive Shell Stress from Seismic Loads ?

Good ! Calculated Seismic Compressive Stress is less than Allowable

Height of sloshing wave per API 650 Appendix E ?
Wind Overturning for 100 mph wind?

The calculated height of the sloshing wave is 1.64 (ft); recommended freeboard 1.15 (ft)Wind Overturning OK for API 650. No anchors are required to resist wind overturning

AWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 17 of 18

Date Printed: 12/27/19 11:07 AM

PROJECT MANAGEMENT OFFICEAWWA D101-53 INTERNAL INSPECTION
COLONIA, YAP

Tank 2

API 2000 VENTING CALCULATIONSAWWA D101-53 Internal Inspection YSPSC Colonia, Yap Tank 2 October 2019 rev4
© 2019 PE&I Inc.

Page 18 of 18

Date Printed: 12/27/19 11:07 AM

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2APPENDIX A: API 653 CHECKLISTEXTERNAL
1.1 FOUNDATION
ALL
C.1.1

Measure foundation levelness and bottom elevations

See Report 'Shell
Settlement Survey'

CONCRETE RING WALL
C.1.1.1 a

Inspect for broken concrete, spalling, and cracks, particularly under backup
bars used in welding butt welded annular rings under the shell.

See report

C.1.1.1 b

Inspect drain openings in ring, back of water draw basins and top surfaceof ring for indications of bottom leakage.

OK

C.1.1.1 c

Inspect for cavities under foundation and vegetation against bottom of tank.

OK

C.1.1.1 dCheck that runoff rainwater from the shell drains away from tank.

OK

C.1.1.1 e

Check for settlement around perimeter of tank.

OK

C.1.1.2. a

Check for settling of tank into asphalt base which would direct runoff rainwater under the tank instead of away from it.

NA Concrete
RingwallC.1.1.2. b

Look for areas where leaching of oil has left rock filler exposed, whichindicates hydrocarbon leakage.

NA Concrete
RingwallASPHALTOILED DIRT OR SAND
C.1.1.3 a

Check for settlement into the base which would direct runoff rain water
under the tank rather than away from it.

NA Concrete
RingwallROCK
C.1.1.4 a

Presence of crushed rock under the steel bottom usually results in severe
underside corrosion. Make a note to do additional bottom plateexamination (ultrasonic, hammer testing, or turning of coupons) when thetank is out of service.

NA Concrete
Ringwall

SITE DRAINAGE
C.1.1.5 a

C.1.1.5 b

Check site for drainage away from the tank and associated piping andmanifolds.
Check operating condition of the dike drains.

Drainage is awayfrom tank
Not Performed

HOUSEKEEPING
C.1.1.6. aInspect the area for buildup of trash, vegetation, and other inflammablesbuildup.

None present

1.2 SHELLSEXTERNAL VISUAL INSPECTION
C.1.2.1. a

Visually inspect for paint failures, pitting, and corrosion.

See Report

C.1.2.1. b

Clean off the bottom angle area and inspect for corrosion and thinning onplate and weld.

See Report

C.1.2.1. c.

Inspect the bottom-to-foundation seal, if any

None Present

INTERNAL (FLOATING ROOF TANK)
C.1.2.2.aVisually inspect for grooving, corrosion, pitting, and coating failures.

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 1 of 17

NA
Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2
RIVETED SHELL INSPECTION
C.1.2.3. a

Inspect external surface for rivet and seam leaks

Shell Not Riveted

C.1.2.3. b

Locate leaks by sketch or photo (location will be lost when shell is abrasive
cleaned for painting).

Shell Not Riveted

C.1.2.3. c

Inspect rivets for corrosion loss and wear

Shell Not Riveted

C.1.2.3. dInspect vertical seams to see if they have been full fillet lap welded toincrease joint efficiency

Shell Not Riveted

C.1.2.3. e

If no record exists of vertical riveted seams, dimension and sketch (orphotograph) the rivet pattern: number of rows, rivet size, pitch length, andnote whether the joint is butt riveted or lap riveted.

Shell Not Riveted

WIND GIRDER (FLOATING ROOF TANKS)
C.1.2.4. a

Inspect wind girder and handrail for corrosion damage (paint failure, pitting,corrosion product buildup), especially where it occurs at tackwelded junction, and for broken welds.

C.1.2.4. b

Check support welds to shell for pitting, especially on shell plates.

No Wind Girder

C.1.2.4. c

Note whether supports have reinforcing pads welded to shell.

No Wind Girder

No Wind Girder

1.3 SHELL APPURTENANCESMANWAYS AND NOZZLES
C.1.3.1. a

Inspect for cracks or signs of leakage on weld joint at nozzles, manways,
and reinforcing plates.

No seeps present

C.1.3.1. b

Inspect for shell plate dimpling around nozzles, caused by excessive pipe
deflection.

No distortion

C.1.3.1. c

Inspect for flange leaks and leaks around bolting.

No seeps present

C.1.3.1. dInspect sealing of insulation around manways and nozzles.

N/A Tank Not

C.1.3.1. eCheck for inadequate manway flange and cover thickness on mixer
manways.

No Mixer

Insulated

TANK PIPING MANIFOLDS
C.1.3.2. a

Inspect manifold piping, flanges, and valves for leaks.

No leaks observed

C.1.3.2. b

Inspect firefighting system components

NA

C.1.3.2. c

Check for anchored piping which would be hazardous to the tank shell orbottom connections during earth movement.

NA

C.1.3.2. dCheck for adequate thermal pressure relief of piping to the tank.

NA

C.1.3.2. eCheck operation of regulators for tanks with purge gas systems.

Not Performed

C.1.3.2. f

Check sample connections for leaks and for proper valve operation

NA

C.1.3.2. g

Check for damage and test the accuracy of temperature indicators.

NA

C.1.3.2. hCheck welds on shell-mounted davit clips above valves 6 inches and larger.

No davit clips
present

AUTO GAUGE SYSTEM
C.1.3.3. a

Inspect auto gauge tape guide and lower sheave housing (floating swings)
for leaksNA

C.1.3.3. b

Inspect auto gauge head for damage

NAC.1.3.3. c

Bump the checker on auto gauge head for proper movement of tape.

NA

C.1.3.3. dIdentify size and construction material of auto gauge tape guide (floating
roof tanks).

NA

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 2 of 17

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2
C.1.3.3. e

Ask operator if tape tends to hang up during tank roof movement (floating
roof tanks).

NA

C.1.3.3. f

Compare actual product level to the reading on the auto gauge (maximum
variation is 2 inches).

NA

C.1.3.3. g

On floating roof tanks, when the roof is in the lowest position, check that no
more than two feet of tape are exposed at the end of the tape guide.

NA

C.1.3.3. h

Inspect condition of board and legibility of board-type auto gauges.

NA

C.1.3.3. i

Test freedom of movement of marker and float.

NA

SHELL MOUNTED SAMPLE STATION
C.1.3.4. a

Inspect sample lines for function of valves and plugging of lines, including
drain or return-to-tank line.

NA

C.1.3.4. b

Check circulation pump for leaks and operating problems.

NA

C.1.3.4. c

Test bracing and supports for sample lines and equipment.

NA

HEATER (SHELL MANWAY MOUNTED)
C.1.3.5. a

Inspect condensate drain for presence of oil indicating leakage

NA

C.1.3.6. aInspect for proper mounting flange and support.

NA

C.1.3.6. b

Inspect for leakage.

NA

C.1.3.6. c

Inspect condition of power lines and connections to mixer.

NA

MIXER

SWING LINES: WINCH OPERATION
C.1.3.7. a

Non-floating. Raise, then lower the swing line with the winch, and checkfor cable tightness to confirm that swing line lowered properly.

NA

C.1.3.7. b

Floating. With tank half full or more, lower the swing line, then let out cableand check if swing has pulled cable tight, indicating that the winch isoperating properly.

NA

C.1.3.7. c

Indicator. Check that the indicator moves in the proper direction: Floating
swing line indicators show a lower level as cable is wound up on the winch.

NA

Non-floating swing line indicators show the opposite.
SWING LINES: EXTERNAL GUIDE SYSTEM
C.1.3.8. a

Check for leaks at threaded and flanged joints.

NA

SWING LINES: IDENTIFY BALLAST VARYING NEED
C.1.3.9. a

Check for significant difference in stock specific gravity.

NA

SWING LINES: CABLE MATERIAL AND CONDITION
C.1.3.9.1. a
C.1.3.9.1. b

For non-stainless-steel cable, check for corrosion over entire length.
All cable: check for wear or fraying.

SWING LINES: PRODUCT SAMPLE COMPARISON
C.1.3.9.1. c

Check for water or gravity differences that would indicate a leaking swing
joint.

NA

SWING LINES: TARGET
C.1.3.9.1. dTarget should indicate direction of swing opening (up or down) and height
above bottom where suction will be lost with swing on bottom support.

NA

1.4 ROOFSDECK PLATE INTERNAL CORROSION
For safety, before accessing the roof, check with ultrasonic instrument or
C.1.4.1 alightly use a ball peen hammer to test the deck plate near the edge of the

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 3 of 17

UT 3/16-in Nominal
Thickness
Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2
roof for thinning. (Corrosion normally attacks the deck plate at the edge ofa fixed roof and at the raft
DECK PLATE EXTERNAL CORROSION
C.1.4.2. a

Visually inspect for paint failure, holes, pitting, and corrosion product on theroof deck.

See Report

ROOF DECK DRAINAGE
C.1.4.3. a

Look for indication of standing water. (Significant sagging of fixed roof deck
indicates potential rafter failure. Large standing water areas on a floating
roof indicate inadequate drainage design or, if to one side, a non-levelroof with possible leaking

See report

LEVEL OF FLOATING ROOF
C.1.4.4. a

At several locations, measure distance from roof rim to a horizontal weld
seam above the roof. A variance in the readings indicates a non-level roof
with possible shell out-of-round, out-of-plumb, leaking pontoons, or hangup.

N/A

INTERNAL FLOATING ROOF
C.1.4.5. a

Test for explosive gas on top of the internal floating roof. Readings could
indicate a leaking roof, leaking seal system, or inadequate ventilation of thearea above the internal floating roof.

N/A

ROOF INSULATION
C.1.4.6. a

Visually inspect for cracks or leaks in the insulation weather coat whererunoff rain water could penetrate the insulation.

N/A No Roof
Insulation

C.1.4.6. b

Inspect for wet insulation under the weather coat.

N/A No Roof
Insulation

C.1.4.6. cRemove small test sections of insulation and check roof deck for corrosionand holes near the edge of the insulated area.

N/A No Roof
Insulation

FLOATING ROOF SEAL SYSTEMS
C.1.4.6. a

Measure and record maximum seal-to-shell gaps at: 1. Low pump out. 2.
Mid-shell. 3.High liquid level.

C.1.4.6. b

Measure and record annular space at 30-foot spacing (minimum of four
quadrants) around roof and record. Measurements should be taken in
directly opposite pairs. 1.Opposite pair. 2. Opposite pair.

C.1.4.6. c

Check if seal fabric on primary shoe seals is pulling shoes away from shell(fabric not wide enough).

N/A

C.1.4.6. dInspect fabric for deterioration, holes, tears, and cracks.

N/A

C.1.4.6. eInspect visible metallic parts for corrosion and wear.

N/A

C.1.4.6. f

Inspect for openings in seals that would permit vapor emissions.

N/A

C.1.4.6. g

Inspect for protruding bolt or rivet heads against the shell.

N/A

C.1.4.6. hPull both primary and secondary seal systems back all around the shell tocheck their operation.

N/A

C.1.4.6. i

Inspect secondary seals for signs of buckling or indications that their angle
with the shell is too shallow.

N/A

C.1.4.6. j

Inspect wedge-type wiper seals for flexibility, resilience, cracks, and tears.

N/A

N/A
N/A

1.5 ROOF APPURTENANCESSAMPLE HATCH
C.1.5.1. a

Inspect condition and functioning of sample hatch cover.

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Tank 2
C.1.5.1. b

On tanks governed by Air Quality Monitoring District rules, check for thecondition of seal inside hatch cover.

N/A

C.1.5.1. c

Check for corrosion and plugging on thief and gauge hatch cover.

N/A

C.1.5.1. d

Where sample hatch is used to reel gauge stock level, check for marker
and tab stating hold off distance.

N/A

C.1.5.1. eCheck for reinforcing pad where sample hatch pipe penetrates the roof
deck.

N/A

C.1.5.1. f

On floating roof sample hatch and recoil systems, inspect operation of recoil
reel and condition of rope.

N/A

C.1.5.1. g

Test operation of system.

N/A

C.1.5.1. h

On ultra clean stocks such as JP4, check for presence and condition ofprotective coating or liner inside sample hatch (preventing rust from pipe
getting into sample).

N/A

GAUGE WELL
C.1.5.2. a

Inspect visible portion of the gauge well for thinning, size of slots, and covercondition

N/A

C.1.5.2. b

Check for a hold off distance marker and tab with hold off distance (legible).

N/A

C.1.5.2. c

On floating roofs, inspect condition of roof guide for gauge well, particularly
the condition of the rollers for grooving.

N/A

C.1.5.2. d

If accessible, check the distance from the gauge well pipe to the tank shellat different levels.

N/A

C.1.5.2. e

If tank has a gauge-well washer, check valve for leakage and for presenceof a bull plug or blind flange.

N/A

FIXED ROOF SCAFFOLD SUPPORT
C.1.5.3. a

Inspect scaffold support for corrosion, wear, and structural soundness.

N/A

AUTOGAUGE: INSPECTION HATCH AND GUIDES (FIXED ROOF)
C.1.5.4. a

Check the hatch for corrosion and missing bolts.

N/A

C.1.5.4. b

Look for corrosion on the tape guide's and float guides wire anchors.

N/A

AUTOGAUGE: FLOAT WELL COVER
C.1.5.5. a

Inspect for corrosion.

N/A

C.1.5.5. b

Check tape cable for wear or fraying caused by rubbing on the cover.

N/A

SAMPLE HATCH (INTERNAL FLOATING ROOF)
C.1.5.6. aCheck overall conditions.

N/A

C.1.5.6. b

When equipped with a fabric seal, check for automatic sealing after
sampling.

N/A

C.1.5.6. c

When equipped with a recoil reel opening device, check for proper
operations

N/A

ROOF-MOUNTED VENTS (INTERNAL FLOATING ROOF)
C.1.5.7. a

Check condition of screens, locking and pivot pins.

N/A

GAUGING PLATFORM DRIP RING
C.1.5.8. a

On fixed roof tanks with drip rings under the gauging platform or samplingarea, inspect for plugged drain return to the tank

N/A

EMERGENCY ROOF DRAINS
C.1.5.9. a

Inspect vapor plugs for emergency drain: that seal fabric discs are slightly
smaller than the pipe ID and that fabric seal is above the liquid level.

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Tank 2REMOVABLE ROOF LEG RACKS
C.1.5.9.1. a

Check for leg racks on roof.

N/A

VACUUM BREAKERS
C.1.5.9.2. aReport size, number, and type of vacuum breakers. Inspect vacuum
breakers. If high legs are set, check for setting of mechanical breakers inhigh leg position.

NA

C.1.5.9.3. a

Check condition of the screen on the rim vent cover.

NA

C.1.5.9.3. b

Check for plating off or removal of rim vents where jurisdictional rules do
not permit removal.

NA

RIM VENTS

PONTOON INSPECTION HATCHES
C.1.5.9.4. aOpen pontoon inspection hatch covers and visually check inside forpontoon leakage.

NA

C.1.5.9.4. b

Test for explosive gas (an indicator of vapor space leaks).

NA

C.1.5.9.4. c

If pontoon hatches are equipped with locked down coves, check for venttubes. Check that vent tubes are not plugged up. Inspect lock down devices
for condition and operationNA

ACCESS STRUCTURESHANDRAILS
C.1.6.1. a

Identify and report type (steel pipe, galvanized pipe, square tube, angle)
and size of handrails.

OSHA Compliant

C.1.6.1. b

Inspect for pitting and holes, paint failure.

Thinning Paint

C.1.6.1. c

Inspect attachment welds.

Attachment welds
in good condition

C.1.6.1. dIdentify cold joints and sharp edges. Inspect the handrails and mid-rails

Hand rails free fromcold joints andsharp edges.

C.1.6.1. e

Inspect safety drop bar (or safety chain) for corrosion, functioning, andlength.

Not Present

C.1.6.1. f

Inspect the handrail between the rolling ladder and the gaging platform fora hazardous opening when the floating roof is at its lowest level.

NA

PLATFORM FRAME
C.1.6.2. a

Inspect frame for corrosion and paint failure.

N/A

C.1.6.2. b

Inspect the attachment of frame to supports and supports to tank forcorrosion and weld failure.

N/A

C.1.6.2. c

Check reinforcing pads where supports are attached to shell or roof.

N/A

C.1.6.2. dInspect the surface that deck plate or grating rests on, for thinning andholes.

N/A

C.1.6.2. eCheck that flat-surface to flat-surface junctures reseal welded.

N/A

DECK PLATE AND GRATING
C.1.6.3. a

Inspect deck plate for corrosion-caused thinning or holes (not drain holes)
and paint failure.

N/A

C.1.6.3. b

Inspect plate-to-frame weld for rust scale buildup.

N/A

C.1.6.3. c

Inspect grating for corrosion-caused thinning of bars and failure of welds

N/A

C.1.6.3. dCheck grating tie down clips. Where grating has been retrofitted to replace
plate.

N/A

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Tank 2STAIRWAY STRINGERS
C.1.6.4. a

Inspect spiral stairway stringers for corrosion, paint failure, and weld failure.

N/A

Inspect attachment of stairway treads to stringer.
C.1.6.4. b

Inspect stairway supports to shell welds and reinforcing pads.

N/A

C.1.6.4. c

Inspect steel support attachment to concrete base for corrosion.

N/A

ROLLING LADDER
C.1.6.5. a

Inspect rolling ladder stringers for corrosion.

NA

C.1.6.5. b

Identify and inspect ladder fixed rungs (square bar, round bar, angles) for
weld attachment to stringers and corrosion, particularly where angle rungsNA

are welded to stringers
C.1.6.5. c

Check for wear and corrosion where rolling ladder attaches to gauging
platform.

NA

C.1.6.5. dInspect pivot bar for wear and secureness.

NA

C.1.6.5. eInspect operation of self-leveling stairway treads.

NA

C.1.6.5. f

Inspect for corrosion and wear on moving parts.

NA

C.1.6.5. g

Inspect rolling ladder wheels for freedom of movement, flat spots, and wear
on axle.

NA

C.1.6.5. h

Inspect alignment of rolling ladder with roof rack.

NA

C.1.6.5. i

Inspect top surface of rolling ladder track for wear by wheels to assure atleast 18 inches of unworn track (track long enough).

NA

C.1.6.5. j

Inspect rolling ladder track welds for corrosion.

NA

C.1.6.5. k

Inspect track supports on roof for reinforcing pads seal welded to deckplate.

NA

C.1.6.5. lCheck by dimensioning, the maximum angle of the rolling ladder when theroof is on low legs.

NA

C.1.6.5. m

If rolling ladder track extends to within five feet of the edge of the roof on
the far side, check for a handrail on the top of the shell on that side. Max.

NA

angle

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Tank 2

INTERNAL
2.10 OVERVIEW
SAFETY
C.2.1. a

Check that tank has been cleaned, is gas free, and safe for entry.

Acceptable

C.2.1. b

Check that the tank is completely isolated from product lines, all electrical
power, and steam lines.

Acceptable

C.2.1. c

Check that roof is adequately supported, including fixed roof structureand floating roof legs

See Report

C.2.1. d

Check for presence of failing object hazards, such as corroded-throughroof rafters, asphalt stalactites, and trapped hydrocarbons in unopened
or plugged equipment or appurtenances, ledges, etc.

Acceptable

C.2.1. eInspect for slipping hazards on the bottom and roof decks.

Tank bottom isclean

C.2.1. f

Inspect structural welds on access ways and clips

Acceptable

C.2.1. g

Check surfaces needing inspection for a heavy-scale buildup and checkweld seams and oily surfaces where welding is to be done. Note areas
needing more cleaning, including blasting.

Good

2.2 TANK EXTERIOR
INSPECTION
C.2.2. a

Inspect appurtenances opened during cleaning such as lower floating
swing sheave assemblies, nozzle interiors (after removal of valves).

OK

C.2.2. b

Hammer test or ultrasonically test the roof.

OK

C.2.2. cEnter and inspect the floating roof pontoon compartments.

NA

2.3 BOTTOM INTERIOR SURFACEINSPECTION
See Report

C.2.3. aUsing a flashlight held close to and parallel to the bottom plates, andusing the bottom plate layout as a guide, visually inspect and hammer
test the entire bottom.

C.2.3. b

Measure the depth of pitting and describe the pitting appearance (sharpedged, lake type, dense, scattered, etc.)

See Report.

C.2.3. cMark areas requiring patching or further inspection.

See Report

C.2.3. d

Mark locations for turning coupons for inspection.

OK

C.2.3. eInspect all welds for corrosion and leaks, particularly the shell-to-bottom
weld.

See Report

C.2.3. f

Inspect sketch plates for corrosion.

See Report

C.2.3. g

Locate and mark voids under the bottom.

OK

C.2.3. h

Record bottom data on a layout sketch using the existing bottom plates
as a grid. List the number and sizes of patches required.

See report

C.2.3. i

Vacuum test the bottom lap welds.

Not Performed

C.2.3. j

Hammer test or ultrasonically examine any slightly discolored spots ordamp areas.

OK

C.2.3. k

Check for reinforcing pads under all bottom attached clips, brackets, andsupports

See report

C.2.3. lInspect floating roof leg pads for pitting or cutting, and excessive dimpling(indicating excessive loading).

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Tank 2C.2.3. m

Check the column bases of fixed roof supports for adequate pads andrestraining clips.

See report

C.2.3. n

In earthquake zones 3 and 4, check that roof supports are not welded
down to the tank bottom, but are only restrained from horizontal
movement.

See Report

C.2.3. oCheck area beneath swing line cable for indications of cable cutting or
dragging.

N/A No Swing Line

C.2.3. p

Mark old oil and air test connection for removal and patching.

OK

C.2.3. q

Identify and report low areas on the bottom that do not drain adequately.

OK

C.2.3. r

Inspect coating for holes, disbanding, deterioration, and discoloration.

OK

2.4 SHELL SEAMS AND PLATE
INSPECTION
C.2.4. a

On cone up bottoms, closely inspect and gauge the depth of metal loss
on the lower 2 to 4 inches of the shell (area of standing water).

See Report

C.2.4. b

Measure the depth of pitting on each course.

See Report

C.2.4.c

Inspect and estimate the amount of metal loss on the heads of rivets and
bolts

NA

C.2.4. dInspect shell-to-bottom riveted lap joints.

NA

C.2.4. eInspect for vertical grooving damage from seal assembly protrusions.

No Floating Roof

C.2.4. f

Inspect existing protective coatings for damage, deterioration, anddisbanding

See Report

C.2.4. g

Check for areas of rubbing (indicating too much pressure by the seal
assembly shoes or inadequate annular space).

No Floating Roof

C.2.4.hVisually inspect the shell plates and seams for indications of leakage. If
the shell has riveted or bolted seams, record the leak locations by film or
chart in case the locations are lost during surface preparation for painting

No shell leakage

C.2.4. i

Measure annular space at 40-foot intervals.

NA

C.2.4. j

Survey the shell to check for roundness and plumb.

Visually
Acceptableidenified

2.5 SHELL MOUNTED OVERFLOWSINSPECTION
C.2.5. a

Inspect overflow for corrosion and adequate screening.

OK

C.2.5. b

Check location of overflow that it is not above any tank valves or
equipment.

OK

2.6 ROOF INTERIOR SURFACE
GENERAL
C.2.6.1. a

Visually inspect the underside surface of the roof plates for holes, scalebuildup, and pitting.

C.2.6.1. b

Hammer test or ultrasonically examine to check for thin areas,
particularly in the vapor space of floating roofs and at edge of roof oncone roof tank.

C.2.6.1. c

Check all clips, brackets, braces, etc., welded to the roof deck plate forwelded reinforcing pads and see that they have not broken free.

Visually
Acceptable
UT Acceptable

Visually
Acceptable

C.2.6.1. d

If no pad is present, penetrant test for cracking of the weld or deck plate.

OKC.2.6.1. e

Inspect for protective coating for breaks, disbandment, and deterioration

See Report

C.2.6.1. f

Spark test the interior surface coating if recoating is not planned.

NA

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Tank 2
FIXED ROOF SUPPORT STRUCTURE
C.2.6.2. a

Inspect the support columns for thinning in the upper two feet.

NA

C.2.6.2. b

On API columns (two channels welded together) check for corrosion
scale breaking the tack welds, unless the joint between the channels iscompletely seal welded.

NA

C.2.6.2. c

Check that the reinforcing pad on the bottom is seal welded to the tankbottom with horizontal movement restraining clips welded to the pad.

See report.

C.2.6.2. dDetermine if pipe column supports are concrete filled or open pipe. If
open pipe, check for a drain opening in the bottom of the pipeOK

C.2.6.2. eInspect and gauge rafters for thinning, particularly near the center of theroof. Report metal loss.

OK

C.2.6.2. f

Check for loose or twisted rafters.

OK

C.2.6.2. g

Inspect girders for thinning and check that they are attached securely tothe top of the columns.

NA

C.2.6.2. hReport if the columns have cross bracing in the area between the low
pump out of the top of the shell (for future internal floating roof
installation).

OK

C.2.6.2. i

Inspect and report presence of any roof-mounted swing line bumpers.

NA

C.2.6.2. j

Photograph the roof structure if no rafter layout drawing exists.

See Report/Photos

2.7 FIXED ROOF APPURTENANCESINSPECTION AND LIGHT HATCHES
C.2.7.1. a

Inspect the hatches for corrosion, paint and coating failures, holes, andcover sealing.

N/A No Light
Hatches

C.2.7.1. b

On loose covers, check for a safety chain in good condition.

N/A No Light
Hatches

C.2.7.1. c

On light hatches over 30 inches across, check for safety rods

N/A No Light
Hatches

C.2.7.1. dInspect the condition of the gaskets on bold or latched down hatch
covers.

N/A No Light
Hatches

STAGING SUPPORT CONNECTION
C.2.7.2. a

Inspect the condition of the staging support for corrosion.

NA

BREATHERS AND VENTS
C.2.7.3. a
C.2.7.3. b

Inspect and service the breather.
Inspect screens on vents and breathers.

NA
NA

EMERGENCY PV HATCHES
C.2.7.4. a

Inspect and service pressure/vacuum hatches. (Setting should be highenough to prevent chattering of breather during normal operation. See
breather manufacturer's guide,)NA

C.2.7.4. b

Inspect liquid seal hatches for corrosion and proper liquid level in the
seal.

NA

SAMPLE HATCH
C.2.7.5. a

Inspect sample hatch for corrosion.

NA

C.2.7.5. b

Check that the cover operates properlyNA

C.2.7.5. c

If the tank has no gauge well, check for a hold off distance marker andcheck measurement.

NA

2.8 FLOATING ROOF
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Tank 2
ROOF DECK
C.2.8.1. a

Hammer test the area between roof rim and shell. (If access forhammer testing is inadequate, measure the distance from the bottomedge of the roof to the corroded area and then hammer test from inside
the pontoon.)

C.2.8.1. b

In sour water service, clean and test all deck plate weld seams forcracking unless the lower laps have been seal welded.

No Floating Roof

Check that either the roof drain is open, or the drain plug in the roof isopen in case of unexpected rain

No Floating Roof

C.2.8.1. c
C.2.8.1. d

On flat bottomed and cone bottom roof decks, check for a vapor dam
around the periphery of the roof. The dam should be continuous
without break to prevent escape of vapors to the seal area from under
the center of the roof.

No Floating RoofNo Floating RoofFLOATING ROOF PONTOONS
C.2.8.2. a

Visually inspect each pontoon for liquid leakage.

No Floating Roof

C.2.8.2. b

Run a light wire through the goose neck vents on locked down
inspection hatch covers to make sure they are open.

No Floating Roof

C.2.8.2. c

Inspect lockdown latches on each cover.

No Floating Roof

C.2.8.2. dCheck and report if each pontoon is:1. Vapor tight (bulkhead seal
welded on one side on bottom, sides, and top), 2. Liquid tight seal
welded on bottom and sides only), or 3. Unacceptable (minimum
acceptable condition is liquid tight).

No Floating RoofFLOATING ROOF CUTOUTS
C.2.8.3. a

Inspect underside of cutouts for mechanical damage.

No Floating Roof

C.2.8.3. b

Inspect welds for cracks.

No Floating Roof

C.2.8.3. c

Inspect plate for thinning, pitting, and erosion.

No Floating Roof

C.2.8.3. d

Measure mixer cutouts and record plate thickness for future mixer
installation or replacement. Plate thickness

No Floating RoofFLOATING ROOF SUPPORTS
C.2.8.4. a

Inspect fixed low and removable high floating roof legs for thinning.

No Floating Roof

C.2.8.4. b

Inspect for notching at bottom of legs for drainage

No Floating Roof

C.2.8.4. c

Inspect for leg buckling or felling at bottom.

No Floating Roof

C.2.8.4. dInspect pin hole in roof guide for tears.

No Floating Roof

C.2.8.4. eCheck plumb of all legs.

No Floating Roof

C.2.8.4. f

Inspect for adequate reinforcing gussets on all legs through a single
portion of the roof.

No Floating Roof

C.2.8.4. g

Inspect the area around the roof legs for cracking if there is no internal
reinforcing pad or if the topside pad is not welded to the deck plate on
the underside.

No Floating Roof

C.2.8.4. g

Inspect the sealing system on the two-position legs and the vapor plugs
in the fixed low leg for deterioration of the gaskets.

C.2.8.4. h

On shell mounted roof supports, check for adequate clearance basedon the maximum floating roof movement as determined by the positionof the roof relative to the gauge well and/or counter rotational device.

No Floating RoofNo Floating Roof

2.9 FLOATING ROOF SEAL ASSEMBLIESPRIMARY SHOE ASSEMBLYAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
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Tank 2C.2.9.1. aRemove four sections of foam log (foam filled seals) for inspection on
90' locations.

No Floating Roof

C.2.9.1. b

Inspect hanger attachment to roof rim for thinning, bending, broken
welds, and wear of pin holes.

No Floating Roof

C.2.9.1. c

Inspect clips welded to roof rim for thinning.

No Floating Roof

C.2.9.1. dShoes-inspect for thinning and holes in shoes.

No Floating Roof

C.2.9.1. e

Inspect for bit-metal bolts, clips, and attachments.

No Floating Roof

C.2.9.1. f

Seal fabric-inspect for deterioration, stiffening, holes, and tears infabric.

No Floating Roof

C.2.9.1. g

Measure length of fabric from top of shoe to roof rim, and check against
maximum anticipated annular space as roof operates.

No Floating Roof

C.2.9.1. h

Inspect any modification of shoes over shell nozzles, mixers, etc., forclearance.

No Floating Roof

C.2.9.1. i

Inspect shoes for damage caused by striking shell nozzles, mixers, etc.

No Floating Roof

PRIMARY TOROIDAL ASSEMBLY
C.2.9.2. a

Inspect seal fabric for wear, deterioration, holes, and tears

No Floating Roof

C.2.9.2. b

Inspect hold down system for buckling or bending.

No Floating Roof

C.2.9.2. c

Inspect foam for liquid absorption and deterioration.

No Floating Roof

RIM MOUNTED SECONDARIES
C.2.9.3. a

Inspect the rim-mounted bolting bar for corrosion and broken welds.

N/A No Secondary
Seal

C.2.9.3. b

Measure and chart seal-to-shell gaps.

N/A No Secondary
Seal

C.2.9.3. c

Visually inspect seal from below, looking for holes as evident by light.

N/A No Secondary
Seal

C.2.9.3. dInspect fabric for deterioration and stiffness.

N/A Wiper

C.2.9.3. eInspect for mechanical damage, corrosion, and wear on tip in contact
with shell

N/A No Secondary
Seal

C.2.9.3. f

Inspect for contact with obstructions above top of shell.

N/A No Secondary
Seal

2.10 FLOATING ROOF APPURTENANCESROOF MANWAYS
C.2.10.1. a

Inspect walls of manways for pitting and thinning.

No Floating Roof

C.2.10.1. b

On tanks with interface autogauges, check seal around gauge tapecable and guide wires through manway cover.

No Floating Roof

C.2.10.1. c

Inspect cover gasket and bolts.

No Floating Roof

C.2.10.2. a

Check rim vent for pitting and holes

No Floating Roof

C.2.10.2. b

Check vent for condition of screen.

No Floating Roof

C.2.10.2. c

On floating roof tanks where the environmental rules require closing off
the vent, check the vent pipe for corrosion at the pipe-to-rim joint andcheck that the blinding is adequate.

No Floating Roof

RIM VENTVACUUM BREAKER, BREATHER TYPE
C.2.10.3. aService and check operation of breather valve.

No Floating Roof

C.2.10.3. b

Check that nozzle pipe projects no more than 1/2 inch below roof deck

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Tank 2VACUUM BREAKER, MECHANICAL TYPE
C.2.10.4. a

Inspect the stem for thinning. Measure how far the vacuum breakercover riser is off the pipe when the roof is resting on high or low legs.

No Floating RoofROOF DRAINS: OPEN SYSTEMS, INCLUDING EMERGENCY DRAINS
C.2.10.5. a

Check liquid level inside open roof drains for adequate freeboard.
Report if there is insufficient distance between liquid level and top ofdrain.

No Floating Roof

C.2.10.5. b

If tank comes under Air Quality Monitoring District rules, inspect theroof drain vapor plug

No Floating Roof

C.2.10.5. c

If emergency drain is not at the center of the roof, check that there areat least three emergency drains.

No Floating Roof

CLOSED DRAIN SYSTEMS: DRAIN BASINS
C.2.10.6. aInspect for thinning and pitting

No Floating Roof

C.2.10.6. b

Inspect protective coating (topside).

No Floating Roof

C.2.10.6. c

Inspect basin cover or screen for corrosion.

No Floating Roof

C.2.10.6. dTest operation of check valve.

No Floating Roof

C.2.10.6. eCheck for presence of check valve where bottom of basin is below
product level.

C.2.10.6. f

Inspect drain basin(s) to roof deck welds for cracking.

No Floating Roof

C.2.10.6. g

Check drain basin(s) outlet pipe for adequate reinforcement to roof
deck (including reinforcing pad).

No Floating RoofNo Floating Roof

CLOSED DRAIN SYSTEMS: FIXED DRAIN LINE ON TANK BOTTOM
C.2.10.7. aHammer test fixed drain line on tank bottom for thinning andscale/debris plugging.

No Floating Roof

C.2.10.7. b

Inspect supports and reinforcing pads for weld failures and corrosion.

No Floating Roof

C.2.10.7. c

Check that pipe is guided, not rigidly locked to support, to avoid tearingof tank bottom plate.

No Floating Roof

CLOSED DRAIN SYSTEMS: FLEXIBLE PIPE DRAIN
C.2.10.8. a

Inspect for damage to exterior of pipe

No Floating Roof

C.2.10.8. b

Check for obstructions that pipe could catch on.

No Floating Roof

C.2.10.8. c

Inspect shields to protect pipe from snagging.

No Floating Roof

C.2.10.8. dInspect results of hydro-test on flexible roof drain system.

No Floating Roof

CLOSED DRAIN SYSTEMS: ARTICULATED JOINT DRAIN
C.2.10.9. a

Hammer test rigid pipe inflexible joint systems for thinning andscale/debris plugging.

No Floating Roof

C.2.10.9. b

Inspect system for signs of bending or strain.

No Floating Roof

C.2.10.9. c

Inspect results of system hydro test.

No Floating Roof

C.2.10.9. dInspect landing leg and pad.

No Floating RoofAUTOGAUGE SYSTEM AND ALARMS
C.2.10.10. a

Check freedom of movement of tape through autogauge tape guide

No Floating Roof

C.2.10.10. b

Inspect sheaves for freedom of movement.

No Floating Roof

C.2.10.10. c

Test operation checker.

No Floating Roof

C.2.10.10. dInspect tape and tape cable for twisting and fraying.

No Floating RoofAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 13 of 17

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2C.2.10.10. e

Test the tape's freedom of movement through guide sheaves and tapeguide pipe.

No Floating Roof

C.2.10.10. f

On open-top tanks, check that gate tapes with cables have no morethan one foot of tape exposed with float at lowest point.

No Floating Roof

C.2.10.10. g

Check float for leakage.

No Floating Roof

C.2.10.10. h

Test float guide wire anchors for spring action by pulling on wire andreleasingNo Floating Roof

C.2.10.10. i

Inspect float wells in floating roofs for thinning and pitting of walls justabove the liquid level.

No Floating Roof

C.2.10.10. j

Check that the autogauge tape is firmly attached to the float.

No Floating Roof

C.2.10.10. k

Inspect the tape cable and float guide wire fabric seals through the float
well cover.

No Floating Roof

C.2.10.10. l

Inspect the bottom guide wire attachment clip: inspect for a temporary
weighted bar instead of a permanent welded down clip.

No Floating Roof

C.2.10.10. m

Inspect board-type autogauge indicators for legibility and freedom of
movement of indicator.

No Floating Roof

C.2.10.10. n

Measure and record these distances to determine if seal damage will
occur if tank is run over from: 1. Shell top angle to underside of tapeguide system. 2.Liquid level on floating top to top of secondary seal.

No Floating Roof

C.2.10.10. o

Identify floating roots where the tape is connected directly to the roof.

No Floating Roof

C.2.10.10. p

Overfill alarm: Inspect tank overfill prevention alarm switches for proper
operation.

No Floating Roof

2.11 COMMON TANK APPURTENANCESGAUGE WELL
C.2.11.1. a

Inspect gauge well pipe for thinning at about two-thirds distance above
the bottom: look for thinning at the edge of the slots.

N/A No Gauge
Well

C.2.11.1. b

Check for corrosion on the pipe joint. Check that sample cords,
weights, thermometers, etc., have been removed from the pipe.

N/A No Gauge
Well

C.2.11.1. c

Check for cone at bottom end of pipe about one foot above the bottom.

N/A No Gauge
Well

C.2.11.1. dCheck condition of well washer pipe and that its flared end is directed
at the near side of the hold off pad.

N/A No Gauge
Well

C.2.11.1. eCheck that supports for gauge well are welded to pad or to shell andnot directly to bottom plate,

N/A No Gauge
Well

C.2.11.1. f

Check operation of gauge well cover.

N/A No Gauge
Well

C.2.11.1. g

Check presence of a hold-off distance marker in well pipe and record
hold-off distance.

N/A No Gauge
Well

C.2.11.1. h

Identify and report size and pipe schedule, and whether pipe is solid orslotted. Report slot size.

N/A No Gauge
Well

C.2.11.1. i

Check that the hold-off distance plate is seal welded to the bottom andthat any gauge well supports are welded to the plate and not directly tothe bottom.

N/A No Gauge
Well

C.2.11.1. jInspect vapor control float and cable.

N/A No Gauge
Well

C.2.11.1. k

Check for presence and condition of gauge well washer.

N/A No Gauge
Well

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 14 of 17

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2C.2.11.1. l

Check for bull plug or plate blind on gauge well washer valve.

N/A No Gauge
Well

C.2.11.1. m

Inspect gauge well guide in floating roof for pitting and thinning.

N/A No Gauge
Well

C.2.11.1. n

Inspect the guide rollers and sliding plates for freedom of movement.

N/A No Gauge
Well

C.2.11.1. oInspect condition of gauge well pipe seal system.

N/A No Gauge
Well

C.2.11.1. p

On black oil and diesel services: if gauge well is also used for sampling,check for presence of a thief- and gauge-type hatch to avoid spillage.

N/A No Gauge
Well

C.2.11.1. q

Visually inspect inside of pipe for pipe weld protrusions which could
catch or damage vapor control float.

N/A No Gauge
Well

SAMPLING SYSTEMS: ROOF SAMPLE HATCHES
C.2.11.2. a

Inspect roof mounted sample hatches for reinforcing pads andcracking.

N/A

C.2.11.2. b

Inspect cover for operation.

N/A

C.2.11.2. c

For tanks complying with Air Quality Monitoring District rules, inspect
sample hatch covers for adequate sealing

C.2.11.2. dCheck horizontal alignment of internal floating roof sample hatches
under fixed roof hatches.

No Floating Roof

C.2.11.2. eInspect the sealing system on the internal floating roof sample hatch
cover.

No Floating Roof

C.2.11.2. f

Inspect floating roof sample hatch cover recoil reel and rope.

No Floating RoofN/ASHELL NOZZLES
C.2.11.3. a

Inspect shell nozzles for thinning and pitting.

See Report

C.2.11.3. b

Inspect hot tap nozzles for trimming of holes.

NA

C.2.11.3. c

Identify type of shell nozzles.

See Report

C.2.11.3. dIdentify and describe internal piping, including elbow up and elbow
down types.

Good

NOZZLES EXTENDED INTO THE TANK
C.2.11.4. a

Inspect pipe support pads welded to tank bottom.

None

C.2.11.4. b

Inspect to see that pipe is free to move along support without strain or
tearing action on bottom plate.

NA

C.2.11.4. c

Inspect nozzle valves for packing leaks and damaged flange faces.

NA

C.2.11.4. dInspect heater stream nozzle flanges and valves for wire cutting.

NA

C.2.11.4. e

Report which nozzles have thermal pressure relief bosses and valves.

None

C.2.11.4. f

In internal elbow-down fill line nozzles, inspect the wear plate on thetank bottom.

NA

C.2.11.4. g

On elbow-up fill lines in floating roof tanks, check that opening isdirected against underside of roof, not against vapor space. Inspect
impact are for erosion.

NA

DIFFUSERS AND AIR ROLLING SYSTEMS
C.2.11.5. a

Inspect diffuser pipe for erosion and thinning.

N/A No Diffuser

C.2.11.5. b

Check holes in diffuser for excessive wear and enlargement.

N/A No Diffuser

C.2.11.5. c

Inspect diffuser supports for damage and corrosion.

N/A No Diffuser

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 15 of 17

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2C.2.11.5. dCheck that diffuser supports restrain, not anchor, longitudinal line
movement.

N/A No Diffuser

C.2.11.5. eInspect air spiders on bottom of lube oil tanks for plugging anddamaged or broken threaded joints

N/A No Diffuser

C.2.11.6. aInspect flexible joint for cracks and leaks.

No Swing Line
Present

C.2.11.6. b

Scribe the flexible joint across the two moving faces and raise end ofswing line to check the joint's freedom of movement, indicated byseparation of scribe marks.

No Swing Line
Present

C.2.11.6. c

Check that flexible joints over six inches are supported.

No Swing LineSWING LINES

Present
C.2.11.6. dInspect the swing pipe for deep pitting and weld corrosion.

No Swing Line
Present

C.2.11.6. e

Loosen the vent plugs in the pontoons and listen for a vacuum. Lack ofa vacuum indicates a leaking pontoon.

No Swing Line
Present

C.2.11.6. f

Check the results of air test on pontoons during repairs.

No Swing Line
Present

C.2.11.6. g

Inspect the pontoons for pitting.

No Swing Line
Present

C.2.11.6. h

Inspect the pull-down cable connections to the swing

No Swing Line
Present

C.2.11.6. i

Inspect the condition of the bottom-mounted support, fixed roof limiting
bumper, or shell mounted limiting bumper for wood condition, weld andbolt corrosion, and seal welding to bottom or shell.

No Swing Line
Present

C.2.11.6. j

Inspect safety hold-down chain for corrosion and weak links.

No Swing Line
Present

C.2.11.6. k

Check that there is a welded reinforcing pad where the chain connects
to the bottom.

No Swing Line
Present

C.2.11.6. l

If the floating swing in a floating or internal floating roof tank does nothave a limiting device preventing the swing from exceeding 60 degrees,measure and calculate the maximum angle possible with the roof on
overflow. Max. angle on overflow (If the cNo Swing Line
Present

C.2.11.6. m

Inspect pull down cable for fraying.

No Swing Line
Present

C.2.11.6. n

Inspect for three cable clamps where cable attaches to end of swing
line (single reeved) or to roof assembly (double-reeved). Inspect
sheaves for freedom of movement.

No Swing Line
Present

C.2.11.6. oInspect winch operation and check the height indicator for legibility andaccuracy.

C.2.11.6. p

Inspect bottom-mounted sheave assembly at end of pontoon for
freedom of rotation of sheave.

C.2.11.6. q

Inspect shell-mounted lower sheave assembly for freedom of rotation ofsheave, corrosion thinning, and pitting of sheave housing.

C.2.11.6. r

Inspect upper sheave assembly for freedom of movement of sheave.

C.2.11.6. s

Inspect the cable counterbalance assembly for corrosion and freedomof operation.

No Swing Line
Present
No Swing Line
Present
No Swing Line
Present
No Swing Line
Present
No Swing Line
Present

MANWAY HEATER RACKSAWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 16 of 17

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONCOLONIA, YAP

Tank 2C.2.11.7. a

Inspect the manway heater racks for broken welds and bending of thesliding rails.

No Floating Roof

C.2.11.7. b

Measure and record the length of the heater and length of the track.

No Floating RoofMIXER WEAR PLATES AND DEFLECTOR STANDS
C.2.11.8. a

Inspect bottom and shell plates and deflector stands.

N/A No Mixer

C.2.11.8. b

Inspect for erosion and corrosion on the wear plates. Inspect for
rigidity, structural soundness, corrosion, and erosion of deck plates andreinforcing pads that are seal welded to the bottom under the deflector
stand legs.

N/A No Mixer

C.2.11.8. c

Measure for propeller clearance between the bottom of deflector standand roof when the roof is on low legs.

AWWA D101-53 INSPECTION CHECKLIST, YSPSC OCTOBER 2019
© 2019 PE&I Inc.

Page 17 of 17

N/A No Mixer

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2SIGNIFICANT PHOTOS

Photo A
Typical Failed Coating on Bottom Welds

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 1 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo B
Slight Bow in Roof Rafters

Photo C
Typical Vertical Weld Pitting

Photo D
Typical Shell Plate Pitting
SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 2 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo ENo Wear Plate Present

Photo F
General Thinning of Crow's FootSIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 3 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo G
Typical Cathodic Protection Disconnection

Photo H
Pitting on Manway Neck

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 4 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo I
Corroded Internal Ladder

Photo J
Bottom Butt-Weld Corrosion

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 5 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo J2
Under Bottom Suction Weld Corrosion

Photo K
Center Column Pitting

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 6 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo LNo Fall Restrain System on Vertical Ladder

Photo M
Level Float Disconnected

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 7 of 8

Date Printed: 10/28/19

YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: SIGNIFICANT PHOTOSAWWA D101-53 INTERNALINSPECTION
COLONIA, YAP

Tank 2

Photo N
Missing Anchor Bolt

SIGNIFICANT PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 8 of 8

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

GENERAL PHOTOSALL

ACCESS STRUCTURE

Corroded Internal Ladder

No Fall Restrain System on Vertical
Ladder

APPURTENANCES

Pitting on Manway Neck

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 1 of 10

Under Bottom Suction Weld Corrosion

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

Level Float Disconnected

BOTTOM

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 2 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

Typical Failed Coating on Bottom Welds

COLONIA, YAP

Tank 2

Typical Cathodic Protection
Disconnection

Bottom Butt-Weld Corrosion

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 3 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2CORNER WELD

FOUNDATIONGENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 4 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

Missing Anchor Bolt

GENERALPIPING

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 5 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

ROOF

Slight Bow in Roof Rafters

No Wear Plate Present

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 6 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

General Thinning of Crow's Foot

Center Column Pitting

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 7 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOSCOLONIA, YAP

Tank 2

SHELL

Typical Vertical Weld Pitting

Typical Shell Plate Pitting

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 8 of 10

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 9 of 10

COLONIA, YAP

Tank 2

Date Printed: 10/28/19

AWWA D101-53 INTERNAL INSPECTION
YAP STATE PUBLIC SERVICECORPORATIONAPPENDIX B: GENERAL PHOTOS

GENERAL PHOTOS YAP STATE PUBLIC SERVICE SORPORATION TKNO 2 COLONIA, YAP
2019© 2019 PE&I Inc.

Page 10 of 10

COLONIA, YAP

Tank 2

Date Printed: 10/28/19

Appendix C

NDE or UT Report
Report Prepared For

PROJECT MANAGEMENTOFFICEYAP STATE PUBLICSERVICE CORPORATIONYAP STATE, FEDERATEDSTATES OF MICRONESIA
WATER
Tank Number

2
NDE Conducted on

OCTOBER 2, 2019

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2

Appendix C
Shell Thickness UT Table ........................................................................................................................... 3
Bottom Thickness UT Table ......................................................................................................................... 4
Roof Thickness UT Table ............................................................................................................................. 5
Nozzle Thickness UT Table ......................................................................................................................... 6
Equipment Calibration .................................................................................................................................. 7
POWERS Engineering and Inspection, Inc. was contracted by Central Pacific Tank (CPT) to provide NonDestructive Examination (NDE) services for Tank 2 at the Yap State Public Service Corporation in
Colonia, Yap. The services include, Ultrasonic Testing (UT), Visual Examination.
The following equipment was utilized:

Panametrics DL-36 Plus Thickness Gauge sn:992097204
Panametrics DL-36 Plus Thickness Gauge sn:992157166
Panametrics EPOCH III sn:94085612
Standard UT couplant suitable for temp to 300 deg F.
UT thickness probe Panametrics D790 5Mhz sn:602600
UT thickness probe Panametrics D790 5Mhz sn:603918
UT thickness probe FH2E-WR sn:00W6XP
Calibration Block Panametrics 2214E sn:6182
B&W Gas Alert Max XT II Multi-Gas Detector with Pump

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 2 of 7

Date Printed: 12/27/19 12:16 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2SHELL THICKNESS UT TABLE.
UT thickness readings of the butt-welded shell plate were conducted through the coatings utilizing the
Panametrics DL-36 Thickness Gauge in ‘echo to echo’ mode to compensate for the sound path throughthe coatings. UT readings were performed along to circumference of the lower two courses in twelve
vertical locations, see Shell Rollout drawing for location of upper course readings.
D rop
S he ll
Course Loca tion
T op
U ppe r2
Lowe r
Bo ttom
T op
U ppe r1
Lowe r
Bo ttom

D rop

1
0.259
0.251
0.249
0.255
0.261
0.249
0.248
0.257

2
0.247
0.247
0.249
0.247
0.248
0.247
0.247
0.253

3
0.255
0.248
0.247
0.249
0.251
0.249
0.248
0.255

Course 5 S he ll U T R e a ding s T o p to
Bottom
Lo ca tion
R e a ding Course D ista nce (in)
1
5
59
2
5
53
3
5
47
4
5
41
5
5
35
6
5
29
7
5
23
8
5
17
9
5
11
10

5

5

4
0.247
0.247
0.249
0.253
0.255
0.249
0.248
0.249

5
0.251
0.249
0.248
0.248
0.261
0.247
0.248
0.248

6
0.247
0.248
0.247
0.247
0.257
0.247
0.248
0.249

D ro p

7
0.258
0.249
0.248
0.251
0.248
0.248
0.247
0.254

Course 4 S he ll U T R e a ding s T op to
BottomLoca tion

8
0.257
0.248
0.250
0.249
0.247
0.249
0.248
0.247

9
0.250
0.247
0.251
0.250
0.247
0.247
0.247
0.248

10
0.251
0.247
0.248
0.248
0.250
0.248
0.248
0.247

11
0.248
0.248
0.256
0.250
0.254
0.248
0.247
0.247

Course 3 S he ll U T R e a dings T op to
Bottom
Lo ca tion

U T (in) R e a ding Course D ista nce (in)
0.248
1
4
59
0.256
2
4
53
0.256
3
4
47
0.247
4
4
41
0.253
5
4
35
0.250
6
4
29
0.247
7
4
23
0.250
8
4
17
0.249
9
4
11

U T (in) R e a ding Course D ista nce (in)
0.247
1
3
59
0.249
2
3
53
0.247
3
3
47
0.259
4
3
41
0.249
5
3
35
0.255
6
3
29
0.248
7
3
23
0.249
8
3
17
0.248
9
3
11

U T (in)
0.248
0.248
0.249
0.247
0.251
0.247
0.252
0.251
0.249

0.261

0.247

0.255

10

4

5

10

3

5

Course 6 S he ll U T R e a dings T op to
Bottom
Lo ca tion
R e a ding Course D ista nce (in)
1
6
44
2
6
38
3
6
32
4
6
26
5
6
20
6
6
14
7
6
8
8
6
2

Appendix C – Tank 20106© 2019 PE&I Inc.

12
0.247
0.250
0.249
0.247
0.252
0.247
0.249
0.249

U T (in)
0.247
0.249
0.248
0.254
0.251
0.248
0.248
0.259

Page 3 of 7

Date Printed: 12/27/19 12:16 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2

BOTTOM THICKNESS UT TABLE
Systematic bottom UT measurements were difficult to obtain through the rough surface of the bottom
coatings. UT readings were conducted in a formation of eight radial lines (see Bottom Layout) with 10
measurements recorded per radial line.

R e a ding
1
2
3
4
5
6
7
8
9
10

Appendix C – Tank 20106© 2019 PE&I Inc.

1
0.246
0.247
0.249
0.244
0.242
0.249
0.241
0.243
0.241
0.247

Bottom U T T hickne ss R e a ding s (in)R a dia l S ta tion
2
3
4
5
6
0.248
0.249
0.249
0.248
0.248
0.243
0.244
0.243
0.247
0.244
0.248
0.241
0.246
0.244
0.247
0.245
0.246
0.245
0.247
0.245
0.248
0.242
0.241
0.241
0.245
0.243
0.243
0.242
0.243
0.241
0.245
0.245
0.245
0.248
0.243
0.241
0.242
0.246
0.242
0.243
0.242
0.241
0.244
0.248
0.241
0.246
0.247
0.241
0.245
0.244

Page 4 of 7

7
0.248
0.244
0.244
0.246
0.241
0.242
0.241
0.242
0.247
0.249

8
0.249
0.246
0.243
0.241
0.246
0.247
0.246
0.245
0.246
0.245

Date Printed: 12/27/19 12:16 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2

ROOF THICKNESS UT TABLE
Random UT thickness readings of the 3/16-in nominal lap-welded cone roof plates were conductedutilizing the Panametrics DL-36 Thickness Gauge in ‘echo to echo’ mode to compensate for the soundpath through the coatings. Due to limited safe access at the time of inspection UT reading wereconducted from a manlift near the roof manway (see Cone Roof Layout).

P la te25
26

Appendix C – Tank 20106© 2019 PE&I Inc.

R oof U T T hickne ss R e a ding (in)
1
2
3
4
0.185
0.176
0.186
0.181
0.181
0.180
0.179
0.180

Page 5 of 7

5
0.185
0.180

Date Printed: 12/27/19 12:16 PM

NDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2NOZZLE THICKNESS UT TABLE
Tank Shell Nozzle & Appurtenances Table with Geometry API 650 and Weld Spacing Check API 653

20

53

0.25

>=
49.5
Ok
18
<
19
Not Ok

>=
0.247
Ok
0.25
>=
0.247
Ok

A

OK

Ok

A

OK

Some of the repad geometry or w eld spacings is less than required.
Because, these items have most likely been in service during a hydrotest, or in low temp service, API 653 w ould consider the brittle
f racture risk low and theref ore, no action is req'd.

Comments

0.247

63
>=
60
Ok
22
<
23.25
Not OkDoes Repad meetrequirements of
API 650 5.7.2?

8

0.732
>=
A
0.1875
Ok
0.321
<
A
0.5
Not Okre f AP I 650 tbl 5-6b

Weld Detail nozzle
neck
to shell and repad

Nozzle

0.732
0.733
0.741
0.748
0.321
0.322
0.322
0.323

>=
29
Ok
24.00
<
13.75
Ok

Repad Thickness (in)

B

38.00

Height (in)26

Width (in)

0.247

Repad

Shape

24

Min, API 650, OK?

Bottom of Nozzle to
BottomManwayField UT Data
top, bottom, left andright

Course Thickness (in)A

Nozzle Thickness (in)Nozzle Centerline to
BottomDescription

Diameter (in)Nozzle Height (in)

Item

Shell

© POW ER S Enginee ring and I nspe ction, I nc . 2 01 9

AP I 650 5.7.2

REPAD
WIDTH

shell

W IDTH

DIAMET ER

repadnozzleREPA D
HEIGH TNOZ ZLEHEIGHTAPIAPI SQDIAMOND

DOG

API
DOG

OVAL

SQ

DOOR

SQ RND

A

B

C

D

E

F

G

H

I

A

B

C

LOC ATION

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 6 of 7

Date Printed: 12/27/19 12:16 PMJNOZZLE WELD DETAILSNDE Report
PROJECT MANAGEMENT OFFICE

COLONIA, YAP

Tank 2EQUIPMENT CALIBRATION
Date
October 2, 2019
(Daily Calibration)

Equipment
Panametrics DL-36 Plus
Thickness Gauge

October 2, 2019
(Daily Calibration)

B&W Gas Alert Max XT
II Multi-Gas Detector

Appendix C – Tank 20106© 2019 PE&I Inc.

Page 7 of 7

Calibration Tool
Calibration using 5-step
block (0.1, 0.2, 0.3, 0.4,
0.5-in) in accordancewith ASTM E 797-05.
Calibration performed inaccordance with PEI
NDE Manual.
Bump tested prior toeach use. Calibration
performed using CH4
Calibration Gas BW
CG-Q34-4

Calibrated By
DMDM

Date Printed: 12/27/19 12:16 PM

Appendix 4

Tank 2 Site Photo (Aerial View)

Appendix 5