Z10.2

Z10.2 Hull Surveys of Bulk Carriers

1992(cont’d)(Rev.1 1994)(Rev.2 1994)(Rev.3 1995)(Rev.4 1996)(Rev.5 1996)(Rev.6 1996)(Rev.7 1997)(Rev.8
April 1998)(Rev.9July 1999)(Rev.10
Sept. 2000)(Rev.10.1
Sept. 2000)(Rev.11
Nov. 2000)(Rev.11.1
June 2001)(Rev.12Mar. 2002)(Rev.13
Oct.2002)(Rev.14
August 2003)(Rev.15
Dec 2003)(Corr.1
Feb 2004)(Rev.16
Feb 2004)(Rev.17
June 2005)(Rev.18
Jan. 2006)(Corr.1
Jan 2006)(Rev.19
Jan 2006)(Rev.20
Feb 2006)(Rev.21
May 2006)(Rev.22
June 2006)(Rev.23
Feb 2007)(Rev.24
April 2007)(Rev.25
July 2007)(Rev.26
Nov 2007)(Rev.27
Mar 2009)(Rev.28
Mar 2011)(Rev.29
July 2011)(Rev.30
June 2013)(Rev.31
Jan 2014)(Rev.32
Feb 2015)(Rev.33
Nov 2016)(Rev.34
Aug 2017)(Rev.35
Jan 2018)(Rev.36
May 2019)(Rev.37
Feb 2023)

CONTENTS
1.
1.1
1.2
1.3
1.4

GeneralApplication
Definitions
Repairs
Thickness measurements and close-up surveys

2.
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.3
2.4
2.5
2.6

Special Survey
Schedule
Scope
GeneralDry Dock Survey
Tank Space Protection
Hatch Covers and Coamings
Extent of Overall and Close-up Survey
Extent of Thickness Measurement
Extent of Tank Testing
Additional special survey requirements after determining compliance with SOLAS
XII/12 and XII/13

3.
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.3

Annual Survey
Schedule
Scope
GeneralExamination of the Hull
Examination of weather decks, Hatch Covers and Coamings
Examination of Cargo holdExamination of Ballast Tanks
Additional annual survey requirements for the foremost cargo hold of ships subject to
SOLAS XII/9.1
Additional annual survey requirements after determining compliance with SOLAS
XII/12 and XII/13

3.4
4.
4.1
4.2
4.2.1
4.2.2
4.2.3
4.2.4

Intermediate Survey
Schedule
Scope
General
Bulk Carriers 5-10 Years of Age
Bulk Carriers 10-15 Years of Age
Bulk Carriers exceeding 15 Years of Age

5.
5.1
5.2
5.3
5.4
5.5
5.6
5.7

Preparation for Survey
Survey Programme
Conditions for Survey
Access to Structures
Equipment for Survey
Rescue and emergency response equipment
Survey at Sea or at Anchorage
Survey Planning Meeting

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Z10.2

Z10.2(cont’d)

6.
6.1
6.2
6.3
6.4

Documentation On Board
GeneralSurvey Report FileSupporting Documents
Review of Documentation on board

7.
7.1
7.2
7.3
7.4

Procedures for Thickness Measurement
GeneralCertification of Thickness Measurement Firm
Number and Locations of Measurements
Reporting

8.
8.1
8.2
8.3
8.4

Acceptance Criteria
General
Acceptance criteria for pitting corrosion of CSR ships
Acceptance criteria for edge corrosion of CSR ships
Acceptance criteria for grooving corrosion of CSR ships

9.
9.1
9.2

Reporting and Evaluation of Survey
Evaluation of Survey Report
Reporting

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Z10.2

Z10.2(cont’d)

ENCLOSURES:
Table I:

Minimum Requirement for Close-up Survey at Special Hull Surveys
of Bulk Carriers

Table II:

Minimum Requirements of Thickness Measurement at Special Hull Surveys
of Bulk Carriers

Table III:

Owners Inspection Report

Table IV:

(Superseded by Annex 1)

Table V:

Procedures for certification of Firms Engaged in Thickness Measurement of Hull
Structures

Table VI:

Survey Reporting Principles

Table VII: Executive Hull Summary
Table VIII: Requirements of extent of thickness measurements at those areas of substantial
corrosion

Annex I:IACS Guidelines for Technical Assessment in conjunction withplanning for Enhanced Survey for Bulk Carriers

Annex II:

IACS Recommended Procedures for Thickness Measurements of
Bulk Carriers
IACS Recommended Procedures for Thickness Measurements of
Bulk Carriers Built Under IACS Common Structural Rules

Annex III:

Guidelines for the Gauging of the Vertically Corrugated Transverse
Watertight Bulkhead between Holds Nos. 1 and 2

Annex IV:

Additional annual survey requirements for the foremost cargo hold ofships subject to SOLAS XII/9.1

Annex V:

Guidelines for the Gauging of the Side Shell Frames and Brackets in
Single Side Skin Bulk Carriers

Annex VIA:

Survey ProgrammeAppendix 1
Appendix 2
Appendix 3

Annex VIB:

List of Plans
Survey Planning Questionnaire
Other Documentation

Survey Planning Questionnaire

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Z10.2

Z10.2(cont’d)Notes:
1.

Revisions 4, 5 & 6 1996 of Unified Requirements Z10.2 have been approved byCouncil for application as soon as possible but not later than 1 January 1997.

2.

Changes introduced in Revision 8, 1998 of UR Z10.2, i.e. 1.1.4 and 2.4.1 and columns
for Special Surveys Nos. 3 and 4 of Table II as well as Annex III should be applied by
all Member societies and Associates not later than 1 July 1998.

3.

Changes introduced in Rev.9 to UR Z10.2 are to be applied by all Member Societies
and Associates from 1 September 1999.

4.

Changes introduced in Rev.10 to UR Z10.2 are to be applied by all Member Societies
and Associates from 1 July 2001.

5.

The introduction of Annex IV in Rev.10.2 is to maintain the intermediate survey
requirements invoked in SOLAS XII/9.1 to those of A.744(18) as amended as they
existed in September 2000 and to preclude the inadvertent extension of changes tointermediate survey introduced in Chapter 4 of Rev.10 of this UR from being applied toships subject to SOLAS XII/9.1.

6.

Changes introduced in Rev.11 & Rev.11.1 to UR Z10.2 are to be applied by all
Member Societies and Associates from 1 July 2001.

7.

The amendments to Table I and 4.2.3 introduced in Rev.12 are to further increase therequirements for close-up survey at Special Survey No.2 and to require the scope of
the Intermediate Survey therafter to have the scope of Special Survey No.2.
These requirements are to be implemented for any Special Survey No.2 or theIntermediate Survey subsequent to Special Survey No.2 commenced after 1 January
2003.
Paragraph 4.2.4.3 is newly introduced in Rev.12 in accordance with Res.MSC 105(73)and is to be implemented from 1 July 2002.
The other changes introduced in Rev.12 are to be implemented within one year of the
adoption by Council.

8.

Changes introduced in Rev.15 Corr.1 to UR Z10.2 are to be applied by all Member
Societies and Associates from 1 January 2004 in conjunction with UR S31.

9.

Changes introduced in Rev.16 are in para 1.1.4 and SS3 in Table 1 and are to be
applied by all Member Societies and Associates from 1 January 2005.

10.

Changes introduced in Rev.17 are to be uniformly implemented from 1 July 2006.

11.

Changes introduced in Rev.18 (para. 1.4, 5.5.4, 5.5.6 and 7.1.3) are to be uniformly
applied by IACS Societies on surveys commenced on or after 1 January 2007.

12.

Changes introduced in Rev.19 (para. 2.6 and 3.4) are to be uniformly applied by IACS
Societies on surveys commenced on or after 1 January 2007.

13.

Changes introduced in Rev. 20 (i.e. in para. 5.3.2 through 5.3.4) are to be uniformly
applied by IACS Societies on surveys commenced on or after 1 January 2007.

14.

Changes introduced in Rev.21 (Table 1) are to be uniformly applied by IACS Societies
on surveys commenced on or after 1 July 2007.

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Z10.2

Z10.2

15.

Changes introduced in Rev.22 are to be uniformly applied by IACS Societies on
surveys commenced on or after 1 July 2007.

16.

Changes introduced in Rev. 23 are to be uniformly implemented for surveys
commenced on or after 1 January 2008, whereas statutory requirements of IMO Res.
MSC197(80) apply on 1 January 2007.

17.

Changes introduced in Rev.24 are to be uniformly implemented by IACS Societies forsurveys commenced on or after 1 July 2008.

18.

Changes introduced in Rev.25 are to be uniformly implemented by IACS Societies forsurveys commenced on or after 1 July 2008.

19.

Changes introduced in Rev.26 are to be uniformly applied by IACS Societies forsurveys commenced on or after the 1 January 2009.

20.

Changes introduced in Rev.27 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 July 2010.

(cont’d)As for the requirements regarding semi-hard coatings, these coatings, if alreadyapplied, will not be accepted from the next special or intermediate survey commenced
on or after 1 July 2010, whichever comes first, with respect to waiving the annualinternal examination of the ballast tanks.
21.

Changes introduced in Rev.28 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 July 2012.

22.

Changes introduced in Rev.29 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 July 2012.

23.

The changes to section 6 introduced in Rev.30 are to be uniformly applied by IACS
Societies for surveys commenced on or after 1 July 2016.
The other changes introduced in Rev.30 are to be uniformly applied by IACS Societies
for surveys commenced on or after 1 July 2014.

24.

Changes introduced in Rev.31 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 January 2015.

25.

Changes introduced in Rev.32 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 July 2016.

26.

Changes introduced in Rev.33 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 January 2018.

27.

Changes introduced in Rev.34 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 January 2019.

28.

Changes introduced in Rev.35 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 January 2019.

29.

Changes introduced in Rev.36 are to be uniformly applied by IACS Societies forsurveys commenced on or after 1 July 2020.

30.

Changes introduced in Rev.37 are to be uniformly applied by IACS Societies forsurveys conmmended on or after 1 July 2024.
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Z10.2

Z10.2(cont’d)1.

GENERAL

1.1

Application

1.1.1 The requirements apply to all self-propelled Bulk Carriers other than Double Skin Bulk
Carriers as defined in 1.1.1 of UR Z10.5.
1.1.2 The Requirements apply to surveys of hull structure and piping systems in way of the
cargo holds, cofferdams, pipe tunnels, void spaces, fuel oil tanks within the cargo length area
and all ballast tanks. The requirements are additional to the classification requirements
applicable to the remainder of the ship. Refer to Z7.
1.1.3 The requirements contain the minimum extent of examination, thickness
measurement and tank testing. The survey is to be extended when Substantial Corrosion
and/or structural defects are found and include additional Close-Up Survey when necessary.
1.1.4 Ships which are required to comply with UR S19 are subject to the additional
thickness measurement guidance contained in Annex III with respect to the verticallycorrugated transverse watertight bulkhead between cargo holds Nos. 1 and 2 for purposes ofdetermining compliance with UR S19 prior to the relevant compliance deadline stipulated in
UR S23 and at subsequent intermediate surveys (for ships over 10 years of age) and special
surveys for purposes of verifying continuing compliance with UR S19.
1.1.5 Ships which are required to comply with UR S31 are subject to the additional
thickness measurement guidance contained in Annex V with respect to the side shell frames
and brackets for the purposes of determining compliance with UR S31 prior to the relevant
compliance deadline stipulated in UR S31 and at subsequent intermediate and special
surveys for purposes of verifying continuing compliance with UR S31.
1.1.6 For bulk carriers with hybrid cargo hold arrangements, e.g. with some cargo holds ofsingle side skin and others of double side skin, the requirements of UR Z10.5 are to apply tocargo holds of double side skin and associated wing spaces.
1.2

Definitions

1.2.1 Bulk Carrier
A Bulk Carrier is a ship which is constructed generally with single deck, double bottom,
topside tanks and hopper side tanks in cargo spaces, and is intended primarily to carry dry
cargo in bulk. Combination carriers are included.1 Ore and combination carriers are notcovered by the IACS Common Structural Rules.

1.

For single skin combination carriers additional requirements are specified in UR Z10.1.

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Z10.2

Z10.2(cont’d)1.2.2 Ballast Tank
A Ballast Tank is a tank which is used solely primarily for salt water ballast, or, whereapplicable, a space which is used for both cargo and salt water ballast will be treated as a
Ballast tank when substantial corrosion has been found in that space.
1.2.3 Spaces
Spaces are separate compartments including holds, tanks, cofferdams and void spacesbounding cargo holds, decks and the outer hull.
1.2.4 Overall Survey
An Overall Survey is a survey intended to report on the overall conditions of the hull structureand determine the extent of additional Close-Up Surveys.
1.2.5 Close-Up Survey
A Close-Up Survey is a survey where the details of structural components are within theclose visual inspection range of the surveyor i.e. normally within reach of hand.
1.2.6 Transverse Section
A Transverse Section includes all longitudinal members such as plating, longitudinals andgirders at the deck, sides, bottom; inner bottom hopper sides, longitudinal bulkheads andbottom in top wing tanks. For transversely framed vessels, a transverse section includes
adjacent frames and their end connections in way of transverse sections.
1.2.7 Representative Spaces
Representative Spaces are those which are expected to reflect the condition of other Spacesof similar type and service and with similar corrosion prevention systems. When selecting
Representative Spaces account is to be taken of the service and repair history on board andidentifiable Critical Structural Areas and/or Suspect Areas.
1.2.8 Suspect Areas
Suspect Areas are locations showing Substantial Corrosion and/or are considered by theSurveyor to be prone to rapid wastage.
1.2.9 Critical Structural Area
Critical Structural Areas are locations which have been identified from calculations to requiremonitoring or from the service history of the subject ship or from similar or sister ships (ifavailable) to be sensitive to cracking, buckling or corrosion which would impair the structural
integrity of the ship.
1.2.10 Renewal Thickness
Renewal thickness (tren) is the minimum allowable thickness, in mm, below which renewal ofstructural members is to be carried out.
1.2.11 Substantial Corrosion
Substantial Corrosion is an extent of corrosion such that assessment of corrosion patternindicates a wastage in excess of 75% of allowable margins, but within acceptable limits.
For vessels built under the IACS Common Structural Rules, substantial corrosion is an extent
of corrosion such that the assessment of the corrosion pattern indicates a measured
thickness between tren + 0.5mm and tren.
1.2.12 Corrosion Prevention System
A Corrosion Prevention System is normally considered a full hard protective coating.
Hard Protective Coating is usually to be epoxy coating or equivalent. Other coating systems,
which are neither soft nor semi-hard coatings, may be considered acceptable as alternatives
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Z10.2

Z10.2(cont’d)provided that they are applied and maintained in compliance with the manufacturer’s
specifications.
1.2.13 Coating Condition
Coating Condition is defined as follows:
GOOD

condition with only minor spot rusting.

FAIR

condition with local breakdown at edges of stiffeners and weld
connection and/or light rusting over 20% or more of areas underconsideration, but less than as defined for POOR condition.

POOR

condition with general breakdown of coating over 20% or more, or
hard scale at 10% or more, of areas under consideration.

1.2.14 Cargo Length Area
Cargo Length Area is that part of the ship which includes cargo holds and adjacent areas
including fuel tanks, cofferdams, ballast tanks and void spaces.
1.2.15 Special consideration
Special consideration or specially considered (in connection with close-up surveys andthickness measurements) means sufficient close-up inspection and thickness measurements
are to be taken to confirm the actual average condition of the structure under the coating.
1.2.16 Prompt and Thorough Repair
A Prompt and Thorough Repair is a permanent repair completed at the time of survey to thesatisfaction of the Surveyor, therein removing the need for the imposition of any associatedcondition of class.
1.2.17 Pitting Corrosion
Pitting corrosion is defined as scattered corrosion spots/areas with local material reductions
which are greater than the general corrosion in the surrounding area. Pitting intensity isdefined in Figure 1.
1.2.18 Edge Corrosion
Edge corrosion is defined as local corrosion at the free edges of plates, stiffeners, primary
support members and around openings. An example of edge corrosion is shown in Figure 2.
1.2.19 Grooving Corrosion
Grooving corrosion is typically local material loss adjacent to weld joints along abutting
stiffeners and at stiffener or plate butts or seams. An example of groove corrosion is shown in
Figure 3.

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Z10.2

Z10.2(cont’d)Figure 1 - Pitting intensity diagrams

Figure 2 - Edge corrosion

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Z10.2

Z10.2(cont’d)Figure 3 - Grooving corrosion
1.3

Repairs

1.3.1 Any damage in association with wastage over the allowable limits (including buckling,
grooving, detachment or fracture), or extensive areas of wastage over the allowable limits,which affects or, in the opinion of the Surveyor, will affect the vessel’s structural, watertight orweathertight integrity, is to be promptly and thoroughly (see 1.2.16) repaired. Areas to beconsidered include:- bottom structure and bottom plating- side structure and side plating- deck structure and deck plating- inner bottom structure and inner bottom plating- inner side structure and inner side plating- watertight or oiltight bulkheads- hatch covers or hatch coamings- items in 3.2.3.10.

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Z10.2

Z10.2(cont’d)For locations where adequate repair facilities are not available, consideration may be given to
allow the vessel to proceed directly to a repair facility. This may require discharging the cargo
and/or temporary repairs for the intended voyage.
1.3.2 Additionally, when a survey results in the identification of structural defects or corrosion,
either of which, in the opinion of the Surveyor, will impair the vessel’s fitness for continued
service, remedial measures are to be implemented before the ship continues in service.
1.3.3 Where the damage found on structure mentioned in Para. 1.3.1 is isolated and of a
localised nature which does not affect the ship's structural integrity, consideration may be
given by the surveyor to allow an appropriate temporary repair to restore watertight orweather tight integrity and impose a condition of class in accordance with IACS PR 35, with a
specific time limit.
1.4

Thickness measurements and close-up surveys

In any kind of survey, i.e. special, intermediate, annual or other surveys having the scope ofthe foregoing ones, thickness measurements, when required by Table II, of structures inareas where close-up surveys are required shall be carried out simultaneously with close-up
surveys.

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Z10.2

Z10.2(cont’d)2.

SPECIAL SURVEY1

2.1

Schedule

2.1.1 Special Surveys are to be carried out at a 5 year intervals to renew the Classification
certificate.
2.1.2 The first Special Survey is to be completed within 5 years from the date of the initialclassification survey and thereafter within 5 years from the credited date of the previous
Special Survey. However, an extension of class of 3 months maximum beyond the 5th year
can be granted in exceptional circumstances. In this case, the next period of class will startfrom the expiry date of the Special Survey before the extension was granted.
2.1.3 For surveys completed within 3 months before the expiry date of the Special Survey,
the next period of class will start from the expiry date of the Special Survey. For surveys
completed more than 3 months before the expiry date of the Special Survey, the period ofclass will start from the survey completion date. In cases where the vessel has been laid up
or has been out of service for a considerable period because of a major repair or modificationand the owner elects to only carry out the overdue surveys, the next period of class will startfrom the expiry date of the special survey. If the owner elects to carry out the next due special
survey, the period of class will start from the survey completion date.
2.1.4 The Special Survey may be commenced at the 4th Annual Survey and be progressedwith a view to completion by the 5th anniversary date. When the Special Survey iscommenced prior to the 4th Annual Survey, the entire survey is to be completed within 15
months if such work is to be credited to the Special Survey.
2.1.5 Concurrent crediting to both Intermediate Survey (IS) and Special Survey (SS) for
surveys and thickness measurements of spaces are not acceptable.
2.2

Scope

2.2.1 General
2.2.1.1 The Special Survey is to include, in addition to the requirements of the Annual Survey,
examination, tests, and checks of sufficient extent to ensure that the hull and related piping
as required in 2.2.1.3, is in a satisfactory condition and is fit for its intended purpose for the
new period of class of 5 years to be assigned subject to proper maintenance and operationand to periodical surveys being carried out at the due dates.
2.2.1.2 All cargo holds, Ballast Tanks, including double bottom tanks, pipe tunnels,
cofferdams and void spaces bounding cargo holds, decks and outer hull are to be examined,
and this examination is to be supplemented by thickness measurement and testing as
required in 2.4 and 2.5, to ensure that the structural integrity remains effective. The aim of theexamination is to discover Substantial Corrosion, significant deformation, fractures, damages
or other structural deterioration, that may be present.
2.2.1.3 All piping systems within the above Spaces are to be examined and operationallytested to working pressure to attending Surveyor’s satisfaction to ensure that tightness andcondition remain satisfactory.

1

Some member Societies use the term "Special Periodical Survey" others use the term "Class Renewal
Survey" instead of the term "Special Survey".

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Z10.2

Z10.2(cont’d)2.2.1.4 The survey extent of ballast tanks converted to void spaces is to be speciallyconsidered in relation to the requirements for ballast tanks.
2.2.2 Dry dock Survey
2.2.2.1 A survey in dry dock is to be a part of the Special Survey. The overall and close-up
surveys and thickness measurements, as applicable, of the lower portions of the cargo holds
and ballast tanks are to be carried out in accordance with the applicable requirements for
special surveys, if not already performed.
Note: Lower portions of the cargo holds and ballast tanks are considered to be the parts
below light ballast water line.
2.2.3 Tank Space Protection
2.2.3.1 Where provided, the condition of the corrosion prevention system of Ballast Tanks is
to be examined. For ballast tanks, excluding double bottom tanks, where a hard protective
coating is found in POOR to be in less than GOOD condition and it is not renewed, or where
soft or semi-hard coating has been applied, or where a hard protective coating has not been
applied from the time of construction, the tanks in question are to be examined at annualintervals. Thickness measurements are to be carried out as deemed necessary by thesurveyor.
When such breakdown of hard protective coating is found in water ballast double bottom
tanks and it is not renewed, where a soft or semi-hard coating has been applied, or where ahard protective coating has not been applied from the time of construction, the tanks inquestion may be examined at annual intervals. When considered necessary by the surveyor,or where extensive corrosion exists, thickness measurements are to be carried out.
2.2.3.2 Where a hard protective coating is provided in cargo holds, as defined by Z9 and isfound in GOOD condition, the extent of close-up surveys and thickness measurements may
be specially considered.
2.2.4 Hatch Covers and Coamings
The hatch covers and coamings are to be surveyed as follows:
2.2.4.1 A thorough inspection of the items listed in 3.2.3 is to be carried out, in addition to all
hatch covers and coamings.
2.2.4.2 Checking of the satisfactory operation of all mechanically operated hatch covers is to
be made, including:-stowage and securing in open condition;
proper fit and efficiency of sealing in closed condition;
operational testing of hydraulic and power components, wires, chains, and link drives.

2.2.4.3 Checking the effectiveness of sealing arrangements of all hatch covers by hosetesting or equivalent.
2.2.4.4 Close-up survey and thickness measurement2 of the hatch cover and coaming plating
and stiffeners is to be carried out as given in Table I and Table II.
2

Subject to cargo hold hatch covers of approved design which structurally have no access to the internals,
close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.

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Z10.2

Z10.2(cont’d)

2.3

Extent of Overall and Close-up Survey

2.3.1 An Overall Survey of all tanks and spaces is to be carried out at each Special Survey.
Fuel oil tanks in the cargo length area are to be surveyed as follows:
Special Survey
No.1
Age ≤ 5Special Survey
No.2
5 < Age ≤ 10

Special Survey
No.3
10 < Age ≤ 15

None

One

Two

Special Survey
No.4
and Subsequent
15 < AgeHalf, minimum two

Notes
1. These requirements apply to tanks of integral (structural) type.
2. If a selection of tanks is accepted to be examined, then different tanks are to be examinedat each special survey, on a rotational basis.
3. Peak tanks (all uses) are subject to internal examination at each special survey.
4. At special survey No.3 and subsequent special surveys, one deep tank for fuel oil in the
cargo area is to be included, if fitted.
2.3.2 The minimum requirements for close-up surveys at special survey are given in Table I.
2.3.3 The Surveyor may extend the close-up survey as deemed necessary taking into
account the maintenance of the spaces under survey, the condition of the corrosion
prevention system and where spaces have structural arrangements or details which havesuffered defects in similar spaces or on similar ships according to available information.
2.3.4 For areas in spaces where hard protective coatings are found to be in a GOOD
condition, the extent of close-up surveys according to Table I may be specially considered.
Refer also to 2.2.3.2.
2.4

Extent of Thickness Measurement

2.4.1 The minimum requirements for thickness measurement at Special Survey are given in
Table II.
For additional thickness measurement guidelines applicable to the vertically corrugatedtransverse watertight bulkhead between cargo hold Nos. 1 and 2 on ships subject tocompliance with URs S19 and S23, reference is to be made to 1.1.4 and Annex III.
For additional thickness measurement guidelines applicable to the side shell frames andbrackets on ships subject to compliance with UR S31, reference is to be made to 1.1.5 andAnnex V.
2.4.2 Provisions for extended measurements for areas with Substantial Corrosion are given
in Table VIII and as may be additionally specified in the Survey Programme as required by
5.1. These extended thickness measurements are to be carried out before the survey iscredited as completed. Suspect Areas identified at previous surveys are to be examined.
Areas of substantial corrosion identified at previous surveys are to have thickness
measurements taken.

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Z10.2

Z10.2(cont’d)

For vessels built under IACS Common Structural Rules, the identified substantial corrosion
areas may be:a) protected by coating applied in accordance with the coating manufacturer’s requirements
and examined at annual intervals to confirm the coating in way is still in good condition, or
alternativelyb) required to be measured at annual intervals.
2.4.3 The Surveyor may further extend the thickness measurements as deemed necessary.
2.4.4 For areas in tanks where hard protective coatings are found to be in a GOOD
condition, the extent of thickness measurement according to Table II may be speciallyconsidered. Refer also to 2.2.3.2
2.4.5 Transverse sections are to be chosen where largest reductions are suspected tooccur or are revealed from deck plating measurements, one of which is to be in the amidships
area.
2.4.6 Representative thickness measurement to determine both general and local levels ofcorrosion in the shell frames and their end attachments in all cargo holds and water ballast
tanks is to be carried out. Thickness measurement is also to be carried out to determine thecorrosion levels on the transverse bulkhead plating. The extent of thickness measurements
may be specially considered provided the Surveyor is satisfied by the close-up survey, that
there is no structural diminution, and the hard protective coating where applied remains
efficient.
2.5

Extent of Tank Testing

2.5.1 All boundaries of water ballast tanks, deep tanks and cargo holds used for waterballast within the cargo length area are to be pressure tested. For Fuel Oil Tanks, only
representative tanks are to be pressure tested.
2.5.2 The Surveyor may extend the tank testing as deemed necessary
2.5.3 Boundaries of ballast tanks are to be tested with a head of liquid to the top of air pipes.
2.5.4 Boundaries of ballast holds are to be tested with a head of liquid to near to the top of
hatches.
2.5.5 Boundaries of fuel oil tanks are to be tested with a head of liquid to the highest pointthat liquid will rise under service conditions. Tank testing of fuel oil tanks may be speciallyconsidered based on a satisfactory external examination of the tank boundaries, and aconfirmation from the Master stating that the pressure testing has been carried out according
to the requirements with satisfactory results.
2.5.6 The testing of double bottom tanks and other spaces not designed for the carriage ofliquid may be omitted, provided a satisfactory internal examination together with an
examination of the tanktop is carried out.

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Z10.2(cont’d)2.6

Additional special survey requirements after determining compliance withSOLAS XII/12 and XII/13

2.6.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry
space water level detectors, the special survey is to include an examination and a test of thewater ingress detection systems and of their alarms.
2.6.2 For ships complying with the requirements of SOLAS XII/13 for the availability ofpumping systems, the special survey is to include an examination and a test of the means fordraining and pumping ballast tanks forward of the collision bulkhead and bilges of dry spaces
any part of which extends forward of the foremost cargo hold, and of their controls.

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Z10.2

Z10.2(cont’d)3.

ANNUAL SURVEY

3.1

Schedule

3.1.1 Annual Surveys are to be held within 3 months before or after anniversary date fromthe date of the initial classification survey or of the date credited for the last Special Survey.
3.2

Scope

3.2.1 General
3.2.1.1 The survey is to consist of an examination for the purpose of ensuring, as far aspracticable, that the hull, weather decks, hatch covers, coamings and piping are maintainedin a satisfactory condition and should take into account the service history, condition andextent of the corrosion prevention system of ballast tanks and areas identified in the survey
report file.
3.2.2 Examination of the Hull
3.2.2.1 Examination of the hull plating and its closing appliances as far as can be seen.
3.2.2.2 Examination of watertight penetrations as far as practicable.
3.2.3 Examination of weather decks, Hatch covers and coamings
3.2.3.1 Confirmation is to be obtained that no unapproved changes have been made to thehatch covers, hatch coamings and their securing and sealing devices since the last survey.
3.2.3.2 A thorough survey of cargo hatch covers and coamings is only possible byexamination in the open as well as closed positions and should include verification of proper
opening and closing operation. As a result, the hatch cover sets within the forward 25% of
the ship’s length and at least one additional set, such that all sets on the ship are assessed atleast once in every 5-year period, are to be surveyed open, closed and in operation to the full
extent on each direction at each annual survey, including:.1

stowage and securing in open condition;.2

proper fit and efficiency of sealing in closed condition; and.3

operational testing of hydraulic and power components, wires, chains, and link
drives.

The closing of the covers is to include the fastening of all peripheral, and cross joint cleats orother securing devices. Particular attention is to be paid to the condition of the hatch covers
in the forward 25% of the ship’s length, where sea loads are normally greatest.
3.2.3.3 If there are indications of difficulty in operating and securing hatch covers, additional
sets above those required by 3.2.3.2, at the discretion of the surveyor, are to be tested inoperation.
3.2.3.4 Where the cargo hatch securing system does not function properly, repairs are to be
carried out under the supervision of the Classification Society. Where hatch covers or
coamings undergo substantial repairs, the strength of securing devices should be upgradedto comply with S21.5 of UR S21

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Z10.2(cont’d)3.2.3.5 For each cargo hatch cover set, at each annual survey, the following items are to be
surveyed:
1. Cover panels, including side plates, and stiffener attachments that may beaccessible in the open position by close-up survey (for corrosion, cracks,
deformation);
2. sealing arrangements of perimeter and cross joints (gaskets for condition andpermanent deformation, flexible seals on combination carriers, gasket lips,
compression bars, drainage channels and non return valves);
3. clamping devices, retaining bars, cleating (for wastage, adjustment, andcondition of rubber components);
4.

closed cover locating devices (for distortion and attachment);

5.

chain or rope pulleys;6.

guides;7.

guide rails and track wheels;

8.

stoppers;

9.

wires, chains, tensioners, and gypsies;

10. hydraulic system, electrical safety devices and interlocks; and11. end and interpanel hinges, pins and stools where fitted.
3.2.3.6 At each hatchway, at each annual survey, the coamings, with plating, stiffeners andbrackets are to be checked for corrosion, cracks and deformation, especially of the coaming
tops, including close-up survey.
3.2.3.7 Where considered necessary, the effectiveness of sealing arrangements may be
proved by hose or chalk testing supplemented by dimensional measurements of seal
compressing components.
3.2.3.8 Where portable covers, wooden or steel pontoons are fitted, checking the satisfactory
condition, where applicable, of:-wooden covers and portable beams, carriers or sockets for the portable beam, andtheir securing devices;-

steel pontoons, including close-up survey of hatchcover plating.

-tarpaulins;-

cleats, battens and wedges;-

hatch securing bars and their securing devices;-loading pads/bars and the side plate edge;-

guide plates and chocks;-

compression bars, drainage channels and drain pipes (if any).

3.2.3.9 Examination of flame screens on vents to all bunker tanks.

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Z10.2(cont’d)3.2.3.10 Examination of bunker and vent piping systems, including ventilators.
3.2.4 Examination of Cargo Holds
3.2.4.1a)Bulk Carriers 10-15 years of age, the following is to apply:
Overall Survey of all cargo holds.

b)
Close-up survey of sufficient extent, minimum 25% of frames, to establish thecondition of the lower region of the shell frames including approx. lower one third length ofside frame at side shell and side frame end attachment and the adjacent shell plating in theforward cargo hold. Where this level of survey reveals the need for remedial measures, thesurvey is to be extended to include a Close-up Survey of all of the shell frames and adjacentshell plating of that cargo hold as well as a Close-up survey of sufficient extent of allremaining cargo holds.
c)When considered necessary by the surveyor, or where extensive corrosion exists,
thickness measurement is to be carried out. If the results of these thickness measurements
indicate that Substantial Corrosion is found, the extent of thickness measurements is to be
increased in accordance with Table VIII. These thickness measurements are to be carried out
before the annual survey is credited as completed. Suspect Areas identified at previous
surveys are to be examined. Areas of substantial corrosion identified at previous surveys areto have thickness measurements taken.
For vessels built under the IACS Common Structural Rules, the annual thickness gauging
may be omitted where a protective coating has been applied in accordance with the coating
manufacturer’s requirements and is maintained in good condition.
d)Where the protective coating in cargo holds, as defined by Z9 is found to be in GOOD
condition, the extent of close-up surveys and thickness measurements may be speciallyconsidered.
e)
All piping and penetrations in cargo holds, including overboard piping, are to be
examined.
3.2.4.2 Bulk Carriers over 15 years of age, the following is to apply:a)Overall Survey of all cargo holds.

b)
Close-up survey of sufficient extent, minimum 25% of frames, to establish thecondition of the lower region of the shell frames including approx. lower one third length ofside frame at side shell and side frame end attachment and the adjacent shell plating in theforward cargo hold and one other selected cargo hold. Where this level of survey reveals theneed for remedial measures, the survey is to be extended to include a Close-up Survey of allof the shell frames and adjacent shell plating of that cargo hold as well as a Close-up Surveyof sufficient extent of all remaining cargo holds.
c)When considered necessary by the surveyor, or where extensive corrosion exists,
thickness measurement is to be carried out. If the results of these thickness measurements
indicate that Substantial Corrosion is found, the extent of thickness measurements is to be
increased in accordance with Table VIII. These extended thickness measurements are to be
carried out before the annual survey is credited as completed. Suspect Areas identified at
previous surveys are to be examined. Areas of substantial corrosion identified at previous
surveys are to have thickness measurements taken.

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Z10.2(cont’d)

For vessels built under the IACS Common Structural Rules, the annual thickness gauging
may be omitted where a protective coating has been applied in accordance with the coating
manufacturer’s requirements and is maintained in good condition.
d)Where a hard protective coating is fitted in cargo holds, as defined by Z.9 and is foundin GOOD condition, the extent of close-up surveys and thickness measurements may be
specially considered.
e)
All piping and penetrations in cargo holds, including overboard piping, are to be
examined.
3.2.5 Examination of Ballast Tanks
3.2.5.1 Examination of Ballast Tanks when required as a consequence of the results of theSpecial Survey and Intermediate Survey is to be carried out. When considered necessary by
the surveyor, or where extensive corrosion exists, thickness measurements are to be carriedout. If the results of these thickness measurements indicate that Substantial Corrosion isfound, the extent of thickness measurements is to be increased in accordance with Table VIII.
These extended thickness measurements are to be carried out before the survey is credited
as completed. Suspect Areas identified at previous surveys are to be examined. Areas of
substantial corrosion identified at previous survey are to have thickness measurements taken.
For vessels built under the IACS Common Structural Rules, the annual thickness gauging
may be omitted where a protective coating has been applied in accordance with the coating
manufacturer’s requirements and is maintained in good condition.
3.3
Additional annual survey requirements for the foremost cargo hold of ships
subject to SOLAS XII/9.1
3.3.1 Ships subject to SOLAS XII/9.1 are those meeting all the following conditions:-

Bulk Carriers of 150m in length and upwards of single side skin construction,
carrying solid bulk cargoes having a density of 1780 kg/m3 and above,
contracted for construction (see Note 1) before 1 July 1999, andconstructed with an insufficient number of transverse watertight bulkheads to enable
them to withstand flooding of the foremost cargo hold in all loading conditions andremain afloat in a satisfactory condition of equilibrium as specified in SOLAS XII/4.3.

3.3.2 In accordance with SOLAS XII/9.1, for the foremost cargo hold of such ships, theadditional survey requirements listed in Annex IV shall apply.
3.4

Additional annual survey requirements after determining compliance withSOLAS XII/12 and XII/13

3.4.1 For ships complying with the requirements of SOLAS XII/12 for hold, ballast and dry
space water level detectors, the annual survey is to include an examination and a test, at
random, of the water ingress detection systems and of their alarms.
3.4.2 For ships complying with the requirements of SOLAS XII/13 for the availability ofpumping systems, the annual survey is to include an examination and a test, of the means fordraining and pumping ballast tanks forward of the collision bulkhead and bilges of dry spaces
any part of which extends forward of the foremost cargo hold, and of their controls.
Note 1:“The “contracted for construction” date means the date on which the contract to build the vessel issigned between the prospective owner and the shipbuilder. For further details regarding the date of“contract for construction”, refer to IACS Procedural Requirement (PR) No.29.”

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Z10.2(cont’d)4.

INTERMEDIATE SURVEY

4.1

Schedule

4.1.1 The intermediate Survey is to be held at or between either the 2nd or 3rd Annual
Survey.
4.1.2 Those items which are additional to the requirements of the Annual Survey may besurveyed either at or between the 2nd and 3rd Annual Survey.
4.1.3 Concurrent crediting to both Intermediate Survey (IS) and Special Survey (SS)for surveys and thickness measurements of spaces are not acceptable.
4.2

Scope

4.2.1 General
4.2.1.1 The survey extent is dependent on the age of the vessel as specified in 4.2.2 to 4.2.4.
4.2.2 Bulk Carriers 5 -10 years of age. The following is to apply:
4.2.2.1 Ballast Tanksa)

For tanks used for water ballast, an overall survey of representative spaces
selected by the Surveyor is to be carried out. The selection is to include fore and aftpeak tanks and a number of other tanks, taking into account the total number and typeof ballast tanks. If such overrall survey reveals no visible structural defects, theexamination may be limited to verification that the corrosion prevention systemremains efficient.

b)

Where POOR coating a hard coating is found to be in less than GOOD condition,
corrosion or other defects are found in water Ballast tanks, or where a hard Protective
Coating was not applied from the time of construction, the examination is to beextended to other Ballast tanks of the same type.

c)

In ballast tanks other than double bottom tanks, where a hard Protective Coating isfoundin POOR to be in less than GOOD condition, and it is not renewed, or where softor semi-hard coating has been applied, or where a hard protective coating was notapplied from the time of construction, the tanks in question are to be examined andthickness measurements carried out as considered necessary at annual intervals.
When such breakdown of hard protective coating is found in ballast double bottom
tanks, or where a soft or semi-hard coating has been applied, or where a hardprotective coating has not been applied, the tanks in question may be examined atannual intervals. When considered necessary by the Surveyor, or where extensive
corrosion exists, thickness measurements are to be carried out.

d)In addition to the requirements above, suspect areas identified at previous surveys areto be overall and close-up surveyed.

4.2.2.2 Cargo Holdsa)

An overall survey of all cargo holds, including close-up survey of sufficient extent,
minimum 25 % of frames, is to be carried out to establish the condition of:Page 21 of 139

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Z10.2-

Shell frames including their upper and lower end attachments, adjacent shell
plating, and transverse bulkheads in the forward cargo hold and one otherselected cargo hold;-Areas found suspect at previous surveys.

(cont’d)b)

Where considered necessary by the surveyor as a result of the overall and close-up
survey as described in 4.2.2.2a, the survey is to be extended to include a close-up
survey of all of the shell frames and adjacent shell plating of that cargo hold as well asa close-up survey of sufficient extent of all remaining cargo holds.

4.2.2.3 Extent of Thickness Measurementsa)Thickness measurements are to be carried out to an extent sufficient to determine
both general and local corrosion levels at areas subject to close-up survey as
described in 4.2.2.2a. The minimum requirement for thickness measurements at theIntermediate Survey are areas found to be Suspect Areas at previous surveys.

b)

The extent of thickness measurement may be specially considered provided theSurveyor is satisfied by the close-up survey, that there is no structural diminution andthe hard protective coatings are found to be in a GOOD condition.

c)

Where Substantial Corrosion is found, the extent of thickness measurements is toincreased in accordance with the requirements of Table VIII. These extended
thickness measurements are to be carried out before the survey is credited ascompleted. Suspect Areas identified at previous surveys are to be examined. Areas of
substantial corrosion identified at previous surveys are to have thickness
measurements taken.
For vessels built under IACS Common Structural Rules, the identified substantial
corrosion areas may be:a) protected by coating applied in accordance with the coating manufacturer’s
requirements and examined at annual intervals to confirm the coating in way is still ingood condition, or alternativelyb) required to be measured at annual intervals.

d)Where the hard protective coating in cargo holds, as defined by Z9 is found to be in
GOOD condition, the extent of close-up surveys and thickness measurements may be
specially considered.
Explanatory note:
For existing bulk carriers, where owners may elect to coat or recoat cargo holds as
noted above, consideration may be given to the extent of the close-up and thickness
measurement surveys. Prior to the coating of cargo holds of existing ships, scantlings
should be ascertained in the presence of a surveyor.

4.2.3 Bulk Carriers 10 - 15 years of age. The following is to apply:
4.2.3.1 The requirements of the Intermediate Survey are to be to the same extent to theprevious Special Survey as required in 2 and 5.1. However, internal examination offuel tanks and pressure testing of all tanks are not required unless deemed necessary
by the attending surveyor.

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Z10.2(cont’d)4.2.3.2 In application of 4.2.3.1, the intermediate survey may be commenced at the second
annual survey and be progressed during the succeeding year with a view tocompletion at the third annual survey in lieu of the application of 2.1.4.
4.2.3.3 In application of 4.2.3.1, an under water survey may be considered in lieu of therequirements of 2.2.2.
4.2.4. Bulk Carriers over 15 years of age. The following is to apply:
4.2.4.1 The requirements of the Intermediate Survey are to be to the same extent to theprevious Special Survey as required in 2 and 5.1. However, internal examination offuel tanks and pressure testing of all tanks are not required unless deemed necessary
by the attending surveyor.
4.2.4.2 In application of 4.2.4.1, the intermediate survey may be commenced at the second
annual survey and be progressed during the succeeding year with a view tocompletion at the third annual survey in lieu of the application of 2.1.4.
4.2.4.3 In application of 4.2.4.1, a survey in dry dock is to be part of the intermediate survey.
The overall and close-up surveys and thickness measurements, as applicable, of thelower portions of the cargo holds and water ballast tanks are to be carried out inaccordance with the applicable requirements for intermediate surveys, if not alreadyperformed.
Note: Lower portions of the cargo holds and ballast tanks are considered to be the parts
below light ballast water line.

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Z10.2(cont’d)5

PREPARATION FOR SURVEY

5.1

Survey Programme

5.1.1 The Owner in cooperation with the Classification Society is to work out a specificSurvey Programme prior to the commencement of any part of:-

the Special Survey-

the Intermediate Survey for bulk carriers over 10 years of age.

The Survey Programme is to be in a written format based on the information in Annex VIA.
The survey is not to commence until the Survey programme has been agreed.
5.1.1.1 Prior to the development of the survey programme, the survey planning questionnaire
is to be completed by the owner based on the information set out in Annex VIB, andforwarded to the Classification Society.
5.1.1.2 The Survey Programme at Intermediate Survey may consist of the Survey Programme
at the previous Special Survey supplemented by the Executive Hull Summary of thatSpecial Survey and later relevant survey reports.
The Survey Programme is to be worked out taking into account any amendments to thesurvey requirements after the last Special Survey carried out.
5.1.2 In developing the Survey Programme, the following documentation is to be collected
and consulted with a view to selecting tanks, holds, areas, and structural elements to be
examined:-

Survey status and basic ship information,-

Documentation on-board, as described in 6.2 and 6.3,-

Main structural plans (scantlings drawings), including information regarding use ofhigh tensile steels (HTS),-

Relevant previous survey and inspection reports from both Classification Society andthe Owner,-

Information regarding the use of the ship’s holds and tanks, typical cargoes and otherrelevant data,-

Information regarding corrosion prevention level on the newbuilding,-

Information regarding the relevant maintenance level during operation.

5.1.3 The submitted Survey Programme is to account for and comply, as a minimum, withthe requirements of Tables I, II and paragraph 2.5 for close-up survey, thickness
measurement and tank testing, respectively, and is to include relevant information including
at least :-Basic ship information and particulars,-

Main structural plans (scantling drawings), including information regarding use of hightensile steels (HTS)Page 24 of 139

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Z10.2(cont’d)-Plan of holds and tanks,-

List of holds and tanks with information on use, protection and condition of coating,-Conditions for survey (e.g., information regarding hold and tank cleaning, gas freeing,
ventilation, lighting, etc.),-

Provisions and methods for access to structures,-

Equipment for surveys,-

Nomination of holds and tanks and areas for close-up survey (per 2.3),-

Nominations of sections for thickness measurement (per 2.4),-

Nomination of tanks for tank testing (per 2.5),-

Damage experience related to the ship in question.

5.1.4 The Classification Society will advise the Owner of the maximum acceptable structural
corrosion diminution levels applicable to the vessel.
5.1.5 Use may also be made of the Guidelines for Technical Assessment in Conjunction
with Planning for Enhanced Surveys of Bulk Carriers Special Survey - Hull, contained in
Annex I. These guidelines are a recommended tool which may be invoked at the discretionof the Classification Society, when considered necessary and appropriate, in conjunction withthe preparation of the required Survey Programme.
5.2

Conditions for Survey

5.2.1 The owner is to provide the necessary facilities for a safe execution of the survey.
5.2.1.1 In order to enable the attending surveyors to carry out the survey, provisions forproper and safe access, are to be agreed between the owner and the Classification society
are to be in accordance with IACS PR 37.
5.2.1.2 Details of the means of access are to be provided in the survey planningquestionnaire.
5.2.1.3 In cases where the provisions of safety and required access are judged by theattending surveyor(s) not to be adequate, the survey of the spaces involved is not to proceed.
5.2.2 Cargo holds, tanks and spaces are to be safe for access. Cargo holds, tanks andspaces are to be gas free and properly ventilated. Prior to entering a tank, void or enclosed
space, it is to be verified that the atmosphere in the tank is free from hazardous gas andcontains sufficient oxygen.
5.2.3 In preparation for survey and thickness measurements and to allow for a thoroughexamination, all spaces are to be cleaned including removal from surfaces of all loose
accumulated corrosion scale. Spaces are to be sufficiently clean and free from water, scale,dirt, oil residues etc. to reveal corrosion, deformation, fractures, damages, or other structural
deterioration as well as the condition of the coating. However, those areas of structure whose
renewal has already been decided by the owner need only be cleaned and descaled to theextent necessary to determine the limits of the areas to be renewed.

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Z10.2(cont’d)5.2.4 Sufficient illumination is to be provided to reveal corrosion, deformation, fractures,
damages or other structural deterioration as well as the condition of the coating.
5.2.5 Where soft or semi-hard coatings have been applied, safe access is to be provided forthe surveyor to verify the effectiveness of the coating and to carry out an assessment of theconditions of internal structures which may include spot removal of the coating. When safe
access cannot be provided, the soft or semi-hard coating is to be removed.
5.3

Access to Structures

5.3.1 For overall surveys, means are to be provided to enable the surveyor to examine thehull structure in a safe and practical way.
5.3.2 For close-up surveys of the hull structure, other than cargo hold shell frames, one ormore of the following means for access, acceptable to the Surveyor, is to be provided:-

permanent staging and passages through structures;-

temporary staging and passages through structures;-

hydraulic arm vehicles such as conventional cherry pickers, lifts and movable
platforms;-

portable ladders;-boats or rafts;-

other equivalent means.

5.3.3 For close-up surveys of the cargo hold shell frames of bulk carriers less than 100,000
dwt, one or more of the following means for access, acceptable to the Surveyor, is to beprovided:-permanent staging and passages through structures;-

temporary staging and passages through structures;-

portable ladder restricted to not more than 5 m in length may be accepted for surveys
of lower section of a shell frame including bracket;-

hydraulic arm vehicles such as conventional cherry pickers, lifts and movable
platforms;-

boats or rafts provided the structural capacity of the hold is sufficient to withstandstatic loads at all levels of water;-other equivalent means.

5.3.4 For close-up surveys of the cargo hold shell frames of bulk carriers 100,000 dwt andabove, the use of portable ladders is not accepted, and one or more of the following means
for access, acceptable to the surveyor, is to be provided:
Annual Surveys, Intermediate Survey under 10 years of age and Special Survey No. 1-

permanent staging and passages through structures;
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Z10.2(cont’d)-temporary staging and passages through structures;-

hydraulic arm vehicles such as conventional cherry pickers, lifts and movable
platforms;-

boats or rafts provided the structural capacity of the hold is sufficient to withstandstatic loads at all levels of water;-other equivalent means.

Subsequent Intermediate Surveys and Special Surveys:-

Either permanent or temporary staging and passage through structures for close-up
survey of at least the upper part of hold frames;-

Hydraulic arm vehicles such as conventional cherry pickers for surveys of lower andmiddle part of shell frames as alternative to staging;-

lifts and movable platforms;-

boats or rafts provided the structural capacity of the hold is sufficient to withstandstatic loads at all levels of water;-other equivalent means.

Notwithstanding the above requirements:a) The use of a portable ladder fitted with a mechanical device to secure the upper end of
the ladder is acceptable for the "close-up examination of sufficient extent, minimum 25%
of frames, to establish the condition of the lower region of the shell frames including
approx. lower one third length of side frame at side shell and side frame end attachment
and the adjacent shell plating of the forward cargo hold" at Annual Survey, required in
3.2.4.1.b, and the “one other selected cargo hold" required in 3.2.4.2.b.
b) The use of hydraulic arm vehicles or aerial lifts (“Cherry picker”) may be accepted by theattending surveyor for the close-up survey of the upper part of side shell frames or otherstructures in all cases where the maximum working height is not more than 17 m.
5.4

Equipment for Survey

5.4.1 Thickness measurement is normally to be carried out by means of ultrasonic test
equipment. The accuracy of the equipment is to be proven to the Surveyor as required.
5.4.2 One or more of the following fracture detection procedures may be required if deemednecessary by the Surveyor:-

radiographic equipment-

ultrasonic equipment-

magnetic particle equipment-

dye penetrant

5.4.3 Explosimeter, oxygen-meter, breathing apparatus, lifelines, riding belts with rope andhook and whistles together with instructions and guidance on their use are to be madeavailable during the survey. A safety check-list should be provided.
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Z10.2(cont’d)5.4.4 Adequate and safe lighting is to be provided for the safe and efficient conduct of thesurvey.
5.4.5 Adequate protective clothing is to be made available and used (e.g. safety helmet,
gloves, safety shoes, etc.) during the survey.
5.5

Rescue and emergency response equipment

If breathing apparatus and/or other equipment is used as ‘Rescue and emergency response
equipment’ then it is recommended that the equipment should be suitable for theconfiguration of the space being surveyed.
5.6

Survey at Sea or at Anchorage

5.6.1 Surveys at sea or at anchorage may be accepted provided the Surveyor is given thenecessary assistance from the personnel on board. Necessary precautions and proceduresfor carrying out the survey are to be in accordance with 5.1, 5.2, 5.3, and 5.4.
5.6.2 A communication system is to be arranged between the survey party in the spaces
under examination and the responsible officer on deck. This system is to also include thepersonnel in charge of ballast pump handling if boats or rafts are used.
5.6.3 Surveys of tanks or applicable holds by means of boats or rafts may only beundertaken with the agreement of the Surveyor, who is to take into account the safety
arrangements provided, including weather forecasting and ship response under foreseeableconditions and provided the expected rise of water within the tank does not exceed 0.25m.
5.6.4 When rafts or boats will be used for close-up survey the following conditions are to beobserved:.1 only rough duty, inflatable rafts or boats, having satisfactory residual buoyancy
and stability even if one chamber is ruptured, are to be used;.2 the boat or raft is to be tethered to the access ladder and an additional person is
to be stationed down the access ladder with a clear view of the boat or raft;.3 appropriate lifejackets are to be available for all participants;.4 the surface of water in the tank or hold is to be calm (under all foreseeableconditions the expected rise of water within the tank is to not exceed 0.25 m) andthe water level stationary. On no account is the level of the water to be rising while
the boat or raft is in use;
.5 the tank, hold or space must contain clean ballast water only. Even a thin sheenof oil on the water is not acceptable; and.6 at no time is the water level to be allowed to be within 1 m of the deepest underdeck web face flat so that the survey team is not isolated from a direct escape routeto the tank hatch. Filling to levels above the deck transverses is only to becontemplated if a deck access manhole is fitted and open in the bay being
examined, so that an escape route for the survey party is available at all times.
Other effective means of escape to the deck may be considered.
5.6.5 Rafts or boats alone may be allowed for inspection of the under deck areas for tanks
or spaces, if the depth of the webs is 1.5 m or less.
5.6.6 If the depth of the webs is more than 1.5 m, rafts or boats alone may be allowed only:
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Z10.2Z10.2.1(cont’d).2

when the coating of the under deck structure is in GOOD condition and there isno evidence of wastage; orif a permanent means of access is provided in each bay to allow safe entry andexit.
This means:i.

access direct from the deck via a vertical ladder and a small platform
fitted approximately 2 m below the deck in each bay; orii.

access to deck from a longitudinal permanent platform having ladders to deckin each end of the tank. The platform shall, for the full length of the tank, bearranged in level with, or above, the maximum water level needed for rafting ofunder deck structure. For this purpose, the ullage corresponding to the
maximum water level is to be assumed not more than 3m from the deck platemeasured at the midspan of deck transverses and in the middle length of thetank.

If neither of the above conditions are met, then staging or an “other equivalent means”
is to be provided for the survey of the under deck areas.
5.6.7 The use of rafts or boats alone in paragraphs 5.6.5 and 5.6.6 does not preclude theuse of boats or rafts to move about within a tank during a survey.
Reference is made to IACS Recommendation 39 - Guidelines for the use of Boats or Rafts for
Close-up surveys.
5.7

Survey Planning Meeting

5.7.1 The establishment of proper preparation and the close co-operation between theattending surveyor(s) and the owner’s representatives onboard prior to and during the survey
are an essential part in the safe and efficient conduct of the survey. During the survey onboard safety meetings are to be held regularly.
5.7.2 Prior to commencement of any part of the renewal and intermediate survey, a survey
planning meeting is to be held between the attending surveyor(s), the owner’s representativein attendance, the TM firm representative, where involved, and the master of the ship or an
appropriately qualified representative appointed by the master or Company for the purpose toascertain that all the arrangements envisaged in the survey programme are in place, so as toensure the safe and efficient conduct of the survey work to be carried out. See also 7.1.2.
5.7.3 The following is an indicative list of items that are to be addressed in the meeting:.1

schedule of the vessel (i.e. the voyage, docking and undocking manoeuvres,periods alongside, cargo and ballast operations, etc.).2

provisions and arrangements for thickness measurements (i.e. access,cleaning/de-scaling, illumination, ventilation, personal safety);.3extent of the thickness measurements;.4

acceptance criteria (refer to the list of minimum thicknesses);.5

extent of close-up survey and thickness measurement considering the coating
condition and suspect areas/areas of substantial corrosion;
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Z10.2(cont’d).6

execution of thickness measurements;.7

taking representative readings in general and where uneven corrosion/pitting
is found;.8

mapping of areas of substantial corrosion; and.9communication between attending surveyor(s) the thickness measurement
firm operator(s) and owner representative(s) concerning findings.

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Z10.2

Z10.2(cont’d)

6.

DOCUMENTATION ON BOARD

6.1

General6.1.1 The Owner is to obtain, supply and maintain on board documentation as specified in
6.2 and 6.3, which is to be readily available for the surveyor.
6.1.2 The documentation is to be kept on board for the life time of the ship.
6.1.3 For tankers and bulk carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10,
the Owner is to arrange the updating of the Ship Construction File (SCF) throughout the
ship’s life whenever a modification of the documentation included in the SCF has taken place.
Documented procedures for updating the SCF are to be included within the Safety
Management System.
6.2

Survey Report File

6.2.1 A Survey Report File is to be a part of the documentation on board consisting of-Reports of structural surveys-

Executive Hull Summary-

Thickness measurement reports

6.2.2 The Survey Report File is to be available also in the Owner’s and the Classification
Society's management offices.
6.3

Supporting Documents

6.3.1 The following additional documentation is to be available on board:-

Survey Programme as required by 5.1 until such time as the Special Survey orIntermediate Survey, as applicable, has been completed-

Main structural plans of cargo holds and Ballast Tanks (for CSR ships these plans are
to include for each structural element both the as-built and renewal thickness. Any
thickness for voluntary addition is also to be clearly indicated on the plans. The
midship section plan to be supplied on board the ship is to include the minimum
allowable hull girder sectional properties for hold transverse section in all cargo holds)-

Previous repair history-

Cargo and ballast history-

Inspection by ship's personnel with reference to
•
•
•
•

-

structural deterioration in generalleakages in bulkheads and piping
condition of corrosion prevention system, if any
A guidance for reporting is shown in Table III.

Any other information that will help identify critical structural areas and/or Suspect
Areas requiring inspection.
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Z10.2(cont’d)6.3.2 For tankers and bulk carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10,
the Ship Construction File (SCF), limited to the items to be retained on board, is to beavailable on board.
6.4

Review of Documentation On Board

6.4.1 Prior to survey, the Surveyor is to examine the completeness of the documentation on
board, and its contents as a basis for the survey.
6.4.2 For tankers and bulk carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10,
on completion of the survey, the surveyor is to verify that the update of the Ship Construction
File (SCF) has been done whenever a modification of the documentation included in the SCF
has taken place.
6.4.2.1 For the SCF stored on board ship, the surveyor is to examine the information on
board ship.
In cases where any major event, including, but not limited to, substantial repair andconversion, or any modification to the ship structures, the surveyor is to also verify that the
updated information is kept on board the ship.
If the updating of the SCF onboard is not completed at the time of survey, the Surveyor
records it and requires confirmation at the next periodical survey.
6.4.2.2 For the SCF stored on shore archive, the surveyor is to examine the list of information
included on shore archive.
In cases where any major event, including, but not limited to, substantial repair andconversion, or any modification to the ship structures, the surveyor is to also verify that the
updated information is stored on shore archive by examining the list of information included
on shore archive or kept on board the ship.
In addition, the surveyor is to confirm that the service contract with of the Archive Center isvalid.
If the updating of the SCF Supplement ashore is not completed at the time of survey, theSurveyor records it and requires confirmation at the next periodical survey.
6.4.3 For tankers and bulk carriers subject to SOLAS Chapter II-1 Part A-1 Regulation 3-10,
on completion of the survey, the surveyor is to verify any addition and/or renewal of materials
used for the construction of the hull structure are documented within the Ship Construction
File list of materials.

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Z10.2(cont’d)

7.

PROCEDURES FOR THICKNESS MEASUREMENT

7.1

General7.1.1 The required thickness measurements, if not carried out by the Society itself, are to bewitnessed by a surveyor of the Society. The surveyor is to be on board to the extent
necessary to control the process.
7.1.2 The thickness measurement firm is to be part of the survey planning meeting to beheld prior to commencing the survey.
7.1.3 Thickness measurements of structures in areas where close-up surveys are required
shall be carried out simultaneously with close-up surveys.
7.1.4 In all cases the extent of thickness measurements is to be sufficient as to represent
the actual average condition.
7.2

Certification of Thickness Measurement Firm

7.2.1 The thickness measurement is to be carried out by a qualified firm certified by theClassification Society according to principles stated in Table V.
7.3

Number and Locations of Measurements

7.3.1

Application

The item 7.3 only applies to vessels built under the IACS Common Structural Rules 1. For
vessels not built under IACS Common Structural Rules, the requirements for number andlocations of measurements are according to the Rules of the individual Classification Society
and/or specific IACS URs depending on ship’s age and structural elements concerned.
7.3.2

Number of measurements

Considering the extent of thickness measurements according to the different structuralelements of the ship and surveys (special, intermediate and annual), the locations of thepoints to be measured are given for the most important items of the structure.
7.3.3

Locations of measurements

Table 1 provides explanations and/or interpretations for the application of those requirements
indicated in the Rules, which refer to both systematic thickness measurements related to thecalculation of global hull girder strength and specific measurements connected to close-up
surveys.
Fig 4 to Fig 9 are provided to facilitate the explanations and/or interpretations given in Table 1,
to show typical arrangements of single side skin bulk carriers.

1 IACS Common Structural Rules mean IACS Common Structural Rules for Bulk Carriers (IACS CSR for Bulk
Carriers) or IACS Common Structural Rules for Bulk Carriers and Oil Tankers (IACS CSR BC&OT).

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Z10.2(cont’d)

Table 1: Interpretations of rule requirements for the locations and number of points tobe measured for CSR bulk carriers (single skin)
Item
Selected plates on deck,tank top, bottom, double
bottom and wind-andwater area
All deck, tank top andbottom plates and windand-water strakes

Transverse section

All cargo hold hatch
covers and coamings
Transverse section ofdeck plating outside line ofcargo hatch openings

All deck plating andunderdeck structure inside
line of hatch openings
between cargo holdhatchesInterpretation«Selected» means at leasta single point on one outof three plates, to bechosen on representative
areas of average corrosion
At least two points oneach plate to be taken
either at each 1/4
extremity of plate or atrepresentative areas of
average corrosion
A transverse section
includes all longitudinal
members such as plating,longitudinals and girders
at the deck, side, bottom;
inner bottom and hopperside plating, longitudinalbulkhead and bottom
plating in top wing tanks.
Including plates andstiffeners
Two single points on eachdeck plate (to be taken
either at each 1/4
extremity of plate or atrepresentative areas of
average corrosion)
between the ship sides
and hatch coamings in thetransverse section
concerned«All deck plating» means
at least two points on eachplate to be taken either at
each 1/4 extremity of plateor at representative areasof average corrosion.
“Under deck structure”: ateach short longitudinal
girder: three points for web
plating (fwd/middle/aft),single point for face plate,
one point for web plating
and one point for faceplating of transverse beam
in way. At each ends oftransverse beams, one
point for web plating andone point for face plating
Page 34 of 139

Figure reference

Fig 4

Locations of points are
given in Fig 5

Extent of areas is shownin Annex II Sheet 14
Location of points are
given in Fig 9

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Z10.2

Z10.2(cont’d)Item
Selected side shell frames
in cargo holds

Interpretation
Includes side shell frame,
upper and lower end
attachments and adjacentshell plating.
25% of frames: one out offour frames should
preferably be chosen
throughout the cargo holdlength on each side.

Figure reference
Extent of areas is shownin Annex II Sheet 14
Locations of points are
given in Fig 6

50% of frames: one out of
two frames should
preferably be chosen
throughout the cargo holdlength on each side.

Transverse bulkheads incargo holds

One transverse bulkheadin each cargo holdTransverse bulkheads in
one topside, hopper anddouble bottom ballast tank

«Selected frames» means
at least 3 frames on eachside of cargo holds
Includes bulkhead plating,stiffeners and girders,
including internal structureof upper and lower stools,
where fitted. Two selectedbulkheads: one is to be
the bulkhead between thetwo foremost cargo holds
and the second may bechosen in other positions
This means that the closeup survey and related
thickness measurements
are to be performed on
one side of the bulkhead;
the side is to be chosen
based on the outcome ofthe overall survey of bothsides. In the event of
doubt, the Surveyor may
also require (possibly
partial) close-up survey on
the other side
Includes bulkhead andstiffening systems.

Areas of measurements
are shown in Annex II
Sheet 14
Locations of points are
given in Fig 7

Areas of measurements
are shown in Annex II
Sheet 14
Locations of points are
given in Fig 7

Locations of points are
given in Fig 8

The ballast tank is to bechosen based on thehistory of ballasting among
those prone to have themost severe conditions

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Z10.2(cont’d)

Item
Transverse webs in ballast
tanks

Interpretation
Includes web plating, faceplates, stiffeners andassociated plating andlongitudinals.
One of the representative
tanks of each type (i.e.
topside or hopper or sidetank) is to be chosen in
the forward part

Figure reference
Areas of measurements
are shown in Annex II
Sheet 14
Locations of points are
given in Fig 6

Note: Measurements are to be taken on both port and starboard sides of the selectedtransverse section.
Figure 4 - Transverse section of a single skin bulk carrier

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Z10.2

Z10.2(cont’d)Notes:
1.

Three sections at L/4, L/2, 3L/4 of hatch cover length, including:• one measurement of each hatch cover plate and skirt plate• measurements of adjacent beams and stiffeners• one measurement of coaming plates and coaming flange, each side2.

Measurements of both ends of hatch cover skirt plate, coaming plate and coaming
flange3.

One measurement (two points for web plate and one point for face plate) of one out of
three hatch coaming brackets and bars, on both sides and both ends
Figure 5 - Locations of measurements on hatch covers and coamings

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Z10.2

Z10.2(cont’d)Note: The gauging pattern for web plating is to be a three point pattern for zones A, C and D,
and a two point pattern for zone B (see figure). The gauging report is to reflect the
average reading. The average reading is to be compared with the allowable thickness.
If the web plating has general corrosion then this pattern is to be expanded to a fivepoint pattern.
Figure 6 - Locations of measurements on structural members in cargo holds andballast tanks of single side skin bulk carriers

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Z10.2

Z10.2(cont’d)Note: Measurements to be taken in each shaded area as per views A - A and B - B
Figure 7 - Locations of measurements on cargo hold transverse bulkheads(additional measurements to internal structure of upper and lower stools to be added,
e. g. two points in the upper and two points in the lower stools to be indicated in
section A - A)

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Z10.2

Z10.2(cont’d)Note: Measurements to be taken in each vertical section as per view A - A
Figure 8 - Locations of measurements on transverse bulkheads of topside, hopper anddouble bottom tanks (two additional measurements to internal structure of double
bottom tank to be added at midspan)

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Z10.2

Z10.2(cont’d)Figure 9 - Locations of measurements on underdeck structure
7.4

Reporting

7.4.1 A thickness measurement report is to be prepared. The report is to give the location of
measurement, the thickness measured as well as corresponding original thickness.
Furthermore, the report is to give the date when the measurement was carried out, type ofmeasuring equipment, names of personnel and their qualifications and has to be signed by
the operator.
The thickness measurement report is to follow the principles as specified in the
Recommended Procedures for Thickness Measurement of Bulk Carriers, contained in Annex
II.
7.4.2 The Surveyor is to review the final thickness measurement report and countersign the
cover page.

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Z10.2

Z10.2(cont’d)

8.

ACCEPTANCE CRITERIA

8.1

General8.1.1 For vessels built under IACS Common Structural Rules, the Acceptance Criteria is
according to IACS Common Structural Rules 1 and as specified in 8.2, 8.3 and 8.4.
8.1.2 For vessels not built under IACS Common Structural Rules, the Acceptance Criteria
are according to the Rules of the individual Classification Society and/or specific IACS URs
depending on ship’s age and structural elements concerned, e.g UR S18 for corrugatedtransverse watertight bulkheads, UR S19 for the transverse watertight corrugated bulkhead
between Cargo Holds Nos. 1 and 2, and URS21 for all cargo hatch covers and hatch forward
and side coamings on exposed decks in position 1 (as defined in ILLC), UR S31 for side shellframes, as applicable.
8.2

Acceptance criteria for pitting corrosion of CSR ships

8.2.1 Side structures
If pitting intensity in an area where coating is required, according to IACS Common Structural
Rules 2 is higher than 15% (see Figure 1), thickness measurements are to be performed tocheck the extent of pitting corrosion. The 15% is based on pitting or grooving on only one
side of a plate.
In cases where pitting is exceeding 15%, as defined above, an area of 300 mm or more, atthe most pitted part of the plate, is to be cleaned to bare metal and the thickness is to bemeasured in way of the five deepest pits within the cleaned area. The least thickness
measured in way of any of these pits is to be taken as the thickness to be recorded.
The minimum remaining thickness in pits, grooves or other local areas is to be greater than
the following without being greater than the renewal thickness (tren):•

75% of the as-built thickness, in the frame and end brackets webs and flanges•

70% of the as-built thickness, in the side shell, hopper tank and topside tank plating
attached to the each side frame, over a width up to 30 mm from each side of it.

8.2.2 Other structures
For plates with pitting intensity less than 20%, see Figure 1, the measured thickness, tm of
any individual measurement is to meet the lesser of the following criteria:
tm ≥ 0.7 (tas-built - tvol add) mm
tm ≥ tren - 1 mm
Where:
tas-built

As-built thickness of the member, in mm

tvol add

Voluntary thickness addition; thickness, in mm, voluntarily added as the Owner’s
extra margin for corrosion wastage in addition to tC

1 Ch.13 of IACS CSR for Bulk Carriers, or Ch. 13, Part 1 of IACS CSR BC&OT

2 Sec. 5, Ch. 3 of IACS CSR for Bulk Carriers, or Sec. 4, Ch. 3, Part 1 of IACS CSR BC&OT

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Z10.2

tren

Renewal thickness; minimum allowable thickness, in mm, below which renewal ofstructural members is to be carried outtC

Total corrosion addition, in mm, defined in IACS Common Structural Rules 1

tm

Measured thickness, in mm, on one item, i.e. average thickness on one item
using the various measurements taken on this same item during periodical ship’s
in service surveys(cont’d)

The average thickness across any cross section in the plating is not to be less than the
renewal criteria for general corrosion given in IACS Common Structural Rules 2.
8.3

Acceptance criteria for edge corrosion of CSR ships

8.3.1 Provided that the overall corroded height of the edge corrosion of the flange, or web in
the case of flat bar stiffeners, is less than 25%, see Figure 2, of the stiffener flange breadth or
web height, as applicable, the measured thickness, tm, is to meet the lesser of the following
criteria:
tm ≥ 0.7 (tas-built - tvol add) mm
tm ≥ tren - 1 mm
8.3.2 The average measured thickness across the breadth or height of the stiffener is not tobe less than that defined in IACS Common Structural Rules2.
8.3.3 Plate edges at openings for manholes, lightening holes etc. may be below theminimum thickness given in IACS Common Structural Rules2 provided that:(a)the maximum extent of the reduced plate thickness, below the minimum given in
IACS Common Structural Rules2, from the opening edge is not more than 20% of thesmallest dimension of the opening and does not exceed 100mm.

(b)rough or uneven edges may be cropped-back provided that the maximum dimensionof the opening is not increased by more than 10% and the remaining thickness of the
new edge is not less than tren - 1 mm.

8.4

Acceptance criteria for grooving corrosion of CSR ships

8.4.1 Where the groove breadth is a maximum of 15% of the web height, but not more than
30mm, see Figure 3, the measured thickness, tm, in the grooved area is to meet the lesser ofthe following criteria:
tm ≥ 0.75 (tas-built - tvol add) mm
tm ≥ tren - 0.5 mm
but is not to be less thantm = 6 mm

1 Sec. 3, Ch. 3 of IACS CSR for Bulk Carriers, or Sec. 3, Ch. 3, Part 1of IACS CSR BC & OT
2 Ch. 13 of IACS CSR for Bulk Carriers, or Ch. 13, Part 1 of IACS CSR BC & OT

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Z10.2

Z10.2(cont’d)8.4.2 Structural members with areas of grooving greater than those in 8.4.1 above are to beassessed based on the criteria for general corrosion as defined in IACS Common Structural
Rules 1 using the average measured thickness across the plating/stiffener.

1 Ch. 13 of IACS CSR for Bulk Carriers, or Ch. 13, Part 1 of IACS CSR BC & OT

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Z10.2

Z10.2(cont’d)9.

REPORTING AND EVALUATION OF SURVEY

9.1

Evaluation of Survey Report

9.1.1 The data and information on the structural condition of the vessel collected during thesurvey is to be evaluated for acceptability and continued structural integrity of the vessel.
9.1.1.1 For CSR bulk carriers, the ship’s longitudinal strength is to be evaluated by using the
thickness of structural members measured, renewed and reinforced, as appropriate, during
the special surveys carried out after the ship reached 15 years of age (or during the special
survey no. 3, if this is carried out before the ship reaches 15 years) in accordance with thecriteria for longitudinal strength of the ship’s hull girder for CSR bulk carriers specified in IACS
Common Structural Rules 1.
9.1.1.2 The final result of evaluation of the ship’s longitudinal strength required in 9.1.1.1,
after renewal or reinforcement work of structural members, if carried out as a result of initial
evaluation, is to be reported as a part of the Executive Hull Summary.
9.2

Reporting9.2.1 Principles for survey reporting are shown in table VI.
9.2.2 When a survey is split between different survey stations, a report is to be made foreach portion of the survey. A list of items examined and / or tested (pressure testing,thickness measurements etc.) and an indication of whether the item has been credited, are to
be made available to the next attending surveyor(s), prior to continuing or completing thesurvey.
9.2.3 An Executive Hull Summary of the survey and results is to be issued to the Owner asshown in table VII and placed on board the vessel for reference at future surveys. The
Executive Hull Summary is to be endorsed by the Classification Society's head office orregional managerial office.

1 Ch. 13 of IACS CSR for Bulk Carriers, or Ch. 13, Part 1 of IACS CSR BC & OT

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Z10.2(cont’d)

TABLE ITABLE OF MINIMUM REQUIREMENT FOR CLOSE-UP SURVEY AT
SPECIAL HULL SURVEYS OF BULK CARRIERSSpecial Survey No. 1
Age ≤ 5(A)

- 25% of shell frames in
the forward cargo hold at
representative positions.

(A)- Selected frames inremaining cargo holds.

(B)- One transverse web withassociated plating andlongitudinals in two
representative waterballast tanks of each type(i.e. topside, or hopperside tank).

(C)- Two selected cargo holdtransverse bulkheads,
including internal structureof upper and lower stools,
where fitted.

(D)- All cargo hold hatch
covers and coamings(plating and stiffeners).

Special Survey No. 2
5 < Age ≤ 10
(A)

Special Survey No. 3
10 < Age ≤ 15

- All shell frames in theforward cargo hold and
25% of shell frames ineach of the remaining
cargo holds, including
upper and lower end
attachments andadjacent shell plating.
For Bulk Carriers
100,000 DWT andabove, all shell frames
in the forward cargohold and 50% of shellframes in each of theremaining cargo holds,
including upper andlower end attachments
and adjacent shell
plating.

(A)- All shell frames in theforward and one otherselected cargo hold and
50% of frames in eachof the remaining cargoholds, including upperand lower end
attachments andadjacent shell plating.

(B)- One transverse web
with associated plating
and longitudinals ineach water ballasttank.

Areas (C), (D) and (E) as forSpecial Survey No. 2(B)- Forward and afttransverse bulkhead in
one ballast tank,including stiffening
system.

(C)- All cargo holdtransverse bulkheads,
including internal
structure of upper andlower stools, where
fitted.

(D)- All cargo hold hatch
covers and coamings(plating and stiffeners).

(E)- All deck plating andunder deck structure
inside line of hatch
openings between all
cargo hold hatches.

(B)- All transverse webs
with associated plating
and longitudinals ineach water ballast tank.

(B)- All transverse
bulkheads in ballast
tanks, including
stiffening system.

Special Survey No. 4 andSubsequent
Age > 15(A)
- All shell frames in all
cargo holds including
upper and lower end
attachments and adjacentshell plating.
Areas (B) - (E) as for Special
Survey No. 3(A) - Cargo hold transverse frames(B) - Transverse web frame or watertight transverse bulkhead in water ballast tanks(C) - Cargo hold transverse bulkheads plating, stiffeners and girders(D) - Cargo hold hatch covers and coamings. Subject to cargo hold hatch covers of approved design which structurally have noaccess to the internals, close-up survey/thickness measurement shall be done of accessible parts of hatch covers structures.
(E) - Deck plating and under deck structure inside line of hatch openings between cargo hold hatches
See sketches of sheet 14 for the areas corresponding to (A), (B), (C), (D) and (E)See also sketch in Annex V for zones of side shell frames for ships subject to compliance with UR S31
Note:
Close-up Survey of transverse bulkheads to be carried out at four levels:
Level (a)Immediately above the inner bottom and immediately above the line of gussets (if fitted) and shedders for ships without
lower stool.
Level (b)Immediately above and below the lower stool shelf plate (for those ships fitted with lower stools), and immediately above
the line of the shedder plates.
Level (c)About mid-height of the bulkhead.
Level (d)Immediately below the upper deck plating and immediately adjacent to the upper wing tank, and immediately below theupper stool shelf plate for those ships fitted with upper stools, or immediately below the topside tanks.

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Z10.2

Z10.2(cont’d)

TABLE IIMINIMUM REQUIREMENTS FOR THICKNESS MEASUREMENTS AT SPECIAL HULLSURVEY OF BULK CARRIERSSpecial Survey
No. 1
Age ≤ 5Suspect areas

Special Survey No. 2
5 < Age ≤ 10

Special Survey No. 3
10 < Age ≤ 15

Suspect areas
Within the cargo length:
Two transverse
sections of deck
plating outside line ofcargo hatch openings

Suspect areas
Within the cargo length:- each deck plateoutside line ofcargo hatch
openings

Wind and water strakes in
way of the two transverse
sections considered
above
Selected wind and water
strakes outside the cargo
length area
Measurements, forgeneral assessment andrecording of corrosion
pattern, of those structuralmembers subject to closeup survey according toTable I

See 1.1.5 and Annex V for
additional thickness
measurement guidelines
applicable to the side shellframes and brackets onships subject tocompliance with UR S31.

Special Survey No. 4
and Subsequent
Age > 15
Suspect areas
Within the cargo length:- each deck plateoutside line ofcargo hatch
openings-

two transverse
sections, one in
the amidshiparea, outside lineof cargo hatch
openings-

three transverse
sections, one in
the amidshiparea, outside lineof cargo hatch
openings-

all wind andwater strakes-

each bottom plate

Selected wind and water
strakes outside the cargo
length area

All wind and water
strakes, full length

Measurements, forgeneral assessment andrecording of corrosion
pattern, of those structuralmembers subject to closeup survey according toTable I
See 1.1.4 and Annex III
for additional thickness
measurement guidelines
applicable to the verticallycorrugated transverse
watertight bulkhead
between cargo hold Nos.
1 and 2 on ships subject
to compliance with URs
S19 and S23.
See 1.1.5 and Annex V
for additional thickness
measurement guidelines
applicable to the side
shell frames and brackets
on ships subject tocompliance with UR S31.

Measurements, forgeneral assessment andrecording of corrosion
pattern, of those structuralmembers subject toclose-up survey according
to Table I
See 1.1.4 and Annex III
for additional thickness
measurement guidelines
applicable to the verticallycorrugated transverse
watertight bulkhead
between cargo hold Nos.
1 and 2 on ships subject
to compliance with URs
S19 and S23.
See 1.1.5 and Annex V
for additional thickness
measurement guidelines
applicable to the side
shell frames and brackets
on ships subject tocompliance with UR S31.

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Z10.2(cont’d)

TABLE III
Ship Name: ................................
OWNERS INSPECTION REPORT - Structural Condition
For Tank/Hold No: .......................
Grade of Steel:

Deck
Bottom: .................
: .................

Elements
Other

BucklesCorrosion

CracksSide
Long. Bhd
Coating
cond.

Pitting: .................
: .................
Mod.
/Rep.

Deck:

Bottom:

Side:

Long.
Bulkheads:
Transv.
Bulkheads:
Repairs carried out due to:Thickness measurements carried out, dates:
Results in General:
Overdue Surveys:
Outstanding Conditions of class:Comments:*Repairs are to be surveyed by the classification society

Date ofInspection:
Inspected by:
Signature:

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Z10.2

Z10.2(cont’d)

TABLE IV
PRINCIPLES FOR PLANNING DOCUMENT
Note: Table IV is superseded by Annex I: Guidelines for Technical Assessment inconjunction with planning for Enhanced Surveys of Bulk Carriers Special Survey - Hull.

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Z10.2

Z10.2

TABLE V

(cont’d)

PROCEDURES FOR CERTIFICATION OF FIRMS ENGAGED IN THICKNESSMEASUREMENT OF HULL STRUCTURES
1.

Application
This guidance applies for certification of the firms which intend to engage in the
thickness measurement of hull structures of the vessels.

2.

Procedures for Certification(1)

Submission of Documents:
Following documents are to be submitted to the society for approval:
a)
b)
c)
d)
e)
f)
g)

(2)

Outline of firms, e.g. organisation and management structure.
Experiences of the firms on thickness measurement inter alia of hull structuresof the vessels.
Technicians careers, i.e. experiences of technicians as thickness
measurement operators, technical knowledge of hull structure etc. Operators,
are to be qualified according to a recognized industrial NDT Standard.
Equipment used for thickness measurement such as ultra-sonic testingmachines and its maintenance/calibration procedures.
A guide for thickness measurement operators.
Training programmes of technicians for thickness measurement.
Measurement record format in accordance with the Recommended
Procedures for Thickness Measurements of Bulk Carriers, contained in Annex
II.

Auditing of the firms:
Upon reviewing the documents submitted with satisfactory results, the firm is audited
in order to ascertain that the firm is duly organized and managed in accordance withthe documents submitted, and eventually is capable of conducting thickness
measurement of the hull construction of the ships.

(3)

Certification is conditional on an onboard demonstration at thickness measurements
as well as satisfactory reporting.

3.

Certification(1)

Upon satisfactory results of both the audit of the firm in 2(2) and the demonstration
tests in 2(3) above, the Society will issue a Certificate of Approval as well as a noticeto the effect that the thickness measurement operation system of the firm has beencertified by the Society.

(2)

Renewal/endorsement of the Certificate is to be made at intervals not exceeding 3
years by verification that original conditions are maintained.

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Z10.2

Z10.2

4.

(cont’d)Information of any alteration to the Certified Thickness Measurement Operation
SystemIn case where any alteration to the certified thickness measurement operation systemof the firm is made, such an alteration is to be immediately informed to the Society.
Re-audit is made where deemed necessary by the Society.

5.

Cancellation of Approval
Approval may be cancelled in the following cases:(1)

Where the measurements were improperly carried out or the results were improperly
reported.

(2)

Where the Society's surveyor found any deficiencies in the approved thickness
measurement operation systems of the firm.

(3)

Where the firm failed to inform of any alteration in 4 above to the Society.

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Z10.2

Z10.2

TABLE VI

(cont’d)SURVEY REPORTING PRINCIPLESAs a principle, for bulk carriers subject to ESP, the surveyor is to include the following content
in his report for survey of hull structure and piping systems, as relevant for the survey.
The structure of the reporting content may be different, depending on the report system forthe respective Societies.
1. General
1.1 A survey report is to be generated in the following cases:- In connection with commencement, continuation and / or completion of periodical hullsurveys, i.e. annual, intermediate and special surveys, as relevant-

When structural damages / defects have been found
When repairs, renewals or modifications have been carried out
When condition of class has been imposed or deleted

1.2 The purpose of reporting is to provide:-

Evidence that prescribed surveys have been carried out in accordance with applicableclassification rules
Documentation of surveys carried out with findings, repairs carried out and conditionof class imposed or deleted
Survey records, including actions taken, which shall form an auditable documentary
trail. Survey reports are to be kept in the survey report file required to be on board
Information for planning of future surveys
Information which may be used as input for maintenance of classification rules andinstructions

1.3 When a survey is split between different survey stations, a report is to be made for eachportion of the survey. A list of items surveyed, relevant findings and an indication of whether
the item has been credited, are to be made available to the next attending surveyor, prior tocontinuing or completing the survey. Thickness measurement and tank testing carried out isalso to be listed for the next surveyor.
2. Extent of the survey
2.1 Identification of compartments where an overall survey has been carried out.
2.2 Identification of locations, in each ballast tank and cargo hold including hatch covers andcoamings, where a close-up survey has been carried out, together with information of themeans of access used.
2.3 Identification of locations, in each ballast tank and cargo hold including hatch covers andcoamings, where thickness measurement has been carried out.
Note:

As a minimum, the identification of location of close-up survey and thickness
measurement is to include a confirmation with description of individual structuralmembers corresponding to the extent of requirements stipulated in UR Z10.2 basedon type of periodical survey and the ship's age.

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Z10.2

Z10.2(cont’d)Where only partial survey is required, i.e. 25% of shell frames, one transverse web, twoselected cargo hold transverse bulkheads, the identification is to include location within eachballast tank and cargo hold by reference to frame numbers.
2.4 For areas in ballast tanks and cargo holds where protective coating is found to be in
GOOD condition and the extent of close-up survey and / or thickness measurement has been
specially considered, structures subject to special consideration are to be identified.
2.5 Identification of tanks subject to tank testing.
2.6 Identification of piping systems on deck and within cargo holds, ballast tanks, pipe tunnels,
cofferdams and void spaces where:-

Examination including internal examination of piping with valves and fittings andthickness measurement, as relevant, has been carried out-

Operational test to working pressure has been carried out

3. Result of the survey
3.1 Type, extent and condition of protective coating in each tank, as relevant (rated GOOD,
FAIR or POOR).
3.2 Structural condition of each compartment with information on the following, as relevant:-Identification of findings, such as:
•
•
•
•
•

-

Corrosion with description of location, type and extent
Areas with substantial corrosion
Cracks / fractures with description of location and extent
Buckling with description of location and extent
Indents with description of location and extent

Identification of compartments where no structural damages / defects are foundThe report may be supplemented by sketches / photos.
3.3 Thickness measurement report is to be verified and signed by the surveyor controlling themeasurements on board.
4. Actions taken with respect to findings
4.1 Whenever the attending surveyor is of the opinion that repairs are required, each item tobe repaired is to be identified in the survey report. Whenever repairs are carried out, details of
the repairs effected are to be reported by making specific reference to relevant items in thesurvey report.
4.2 Repairs carried out are to be reported with identification of:-Compartment
Structural member
Repair method (i.e. renewal or modification) including:- steel grades and scantlings (if different from the original);- sketches/photos, as appropriate;
Repair extent
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Z10.2

Z10.2(cont’d)-NDT / Tests

4.3 For repairs not completed at the time of survey, condition of class is to be imposed with a
specific time limit for the repairs. In order to provide correct and proper information to thesurveyor attending for survey of the repairs, condition of class is to be sufficiently detailed
with identification of each item to be repaired. For identification of extensive repairs, reference
may be given to the survey report.

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Z10.2

Z10.2

TABLE VII (i)(cont’d)

IACS UNIFIED REQUIREMENTS FOR ENHANCED SURVEYSEXECUTIVE HULL SUMMARY
Issued upon Completion of Special Survey
GENERAL PARTICULARSSHIP’S NAME:

CLASS IDENTIFY NUMBER:
IMO IDENTIFY NUMBER:

PORT OF REGISTRY:NATIONAL FLAG:

DEADWEIGHT (M. TONNES):GROSS TONNAGE:
NATIONAL:
ITC (69):

DATE OF BUILD:

CLASSIFICATION NOTATION:DATE OF MAJOR CONVERSION:
TYPE OF CONVERSION:a)

The survey reports and documents listed below have been reviewed by theundersigned and found to be satisfactoryb)

A summary of the survey is attached herewith on sheet 2c)

The hull special survey has been completed in accordance with the Regulations on[date]

Executive Summary
Report completed by:
OFFICE
Executive Summary
Report verified by:
OFFICE

Name

Title

Signature
DATE
Name

Title

Signature
DATE

Attached reports and documents:
1)
2)
3)
4)
5)
6)

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Z10.2

Z10.2

TABLE VII (ii)(cont’d)

EXECUTIVE HULL SUMMARYA)

General Particulars: -Ref.Table VII (i)B)

Report Review:-

Where and how survey was done

C)

Close-up Survey:-

Extent (Which tanks)

D)

Thicknessmeasurements:-

Reference to Thickness Measurement report-

Summary of where measured-

Separate form indicating the tanks/areas with
Substantial Corrosion, and corresponding-

Thickness diminution-

Corrosion pattern-

Separate form indicating:-Location of coating-

Condition of coating (if applicable)-

Identification of tanks/areas-

Acceptable defects-

Any points of attention for future surveys, e.g. forSuspect Areas.

-

Extended Annual/Intermediate survey Examination ofballast tanks at annual surveys due to coating
breakdown-

Statement on evaluation/verification of survey report

E)

Tank Protection:F)

Repairs:

G)

Conditions of Class:

H)

Memoranda:

I)

Conclusion:

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Z10.2

Z10.2

TABLE VII (iii) A – non CSR vessels(cont’d)

EXTRACT OF THICKNESS MEASUREMENT
Reference is made to the thickness measurements report:
1)

2)

Position ofsubstantiallycorroded
Tanks/Areas or
Areas with deep
pitting

Thicknessdiminution[%]Corrosion pattern

Remarks:e.g. Ref. attachedsketches

Remarks
1)

Substantial corrosion, i.e. 75 – 100% of acceptable margins wasted.

2)

P = Pitting
C = Corrosion in General
Any bottom plating with a pitting intensity of 20% or more, with wastage in thesubstantial corrosion range or having an average depth of pitting of 1/3 or more ofactual plate thickness is to be noted.

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Z10.2

Z10.2

TABLE VII (iii) B – CSR vessels(cont’d)

EXTRACT OF THICKNESS MEASUREMENTS
Reference is made to the thickness measurements report:
1)

2)

Position ofsubstantiallycorroded
Tanks/Areas or
Areas with deep
pittingtm – tren (mm)Corrosion pattern

Remarks: e.g. Ref.
Attached sketches

Remarks
1)

Substantial corrosion, an extent of corrosion such that the assessment of the corrosion
pattern indicates a measured thickness between tren + 0.5mm and tren.

2)

P = Pitting
C = Corrosion in General
Areas with deep pitting assessed according to 8.2 are to be recorded in this column.

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Z10.2

Z10.2

TABLE VII (iv)(cont’d)TANK SPACE PROTECTION
1)

2)

3)

Tank/hold Nos.

Tank/hold protection

Coating condition

Remarks

Remarks:
1)

All ballast tanks and cargo holds to be listed.

2)

C = Coating

3)

Coating condition according to the following standard

NP = No Protection

GOOD

condition with only minor spot rusting.

FAIR

condition with local breakdown at edges of stiffeners and weld
connections and/or light rusting over 20% or more of areas underconsideration, but less than as defined for POOR condition.

POOR

condition with general breakdown of coating over 20% or more of areasor hard scale at 10% or more of areas under consideration.

For ballast tanks, if coating condition less than “GOOD” "POOR" is given, tanks are to be
examined at annual surveys. extended annual surveys are to be introduced. This is to be
noted in part H) of the Executive Hull Summary.

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Z10.2

Z10.2

TABLE VIII
Sheet 1

(cont’d)

REQUIREMENTS FOR EXTENT OF THICKNESS MEASUREMENT AT THOSE
AREAS OF SUBSTANTIAL CORROSIONSPECIAL SURVEY OF BULK CARRIERS WITHIN THE CARGO AREA
SHELL STRUCTURESSTRUCTURAL MEMBER
1. Bottom and Side Shellplating

EXTENT OF
MEASUREMENT
a. Suspect plate, plus four
adjacent platesb. See other tables forparticulars on gauging in
way of tanks and cargoholds

2. Bottom/Side Shelllongitudinals

Minimum of threelongitudinals in way ofsuspect areas

Page 60 of 139

PATTERN OFMEASUREMENT
a. 5 point pattern for eachpanel between
longitudinals

3 measurements in line
across web
3 measurements on flange

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Z10.2

Z10.2

TABLE VIII
Sheet 2

(cont’d)

REQUIREMENTS FOR EXTENT OF THICKNESS MEASUREMENT AT THOSE
AREAS OF SUBSTANTIAL CORROSIONSPECIAL SURVEY OF BULK CARRIERS WITHIN THE CARGO AREA
TRANSVERSE BULKHEADS IN CARGO HOLDSSTRUCTURAL MEMBER
1. Lower Stool

2. Transverse Bulkhead

EXTENT OF
MEASUREMENT
a. Transverse band within
25mm of welded
connection to inner
bottoma.

PATTERN OFMEASUREMENT
5 point between
stiffeners over 1 metre
lengthb. Transverse band within
25 mm of welded
connection to shelf plate

b.

Ditto

a. Transverse band at
approximately mid heighta.

5 point pattern over 1 sq.
metre of platingb. Transverse band at partb.
of bulkhead adjacent toupper deck or below
upper stool shelf plate(for those ships fitted withupper stools)

5 point pattern over 1 sq.
metre of plating

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Z10.2

Z10.2

TABLE VIII
Sheet 3

(cont’d)

REQUIREMENTS FOR EXTENT OF THICKNESS MEASUREMENT AT THOSE
AREAS OF SUBSTANTIAL CORROSIONSPECIAL SURVEY OF BULK CARRIERS WITHIN THE CARGO AREA
DECK STRUCTURE INCLUDING CROSS STRIPS, MAIN CARGO HATCHWAYS, HATCH
COVERS, COAMINGS AND TOPSIDE TANKSSTRUCTURAL MEMBER
1.

Cross Deck Strip plating

EXTENT OF
MEASUREMENT
Suspect cross deck strip plating

2.

Underdeck Stiffenersa.

Transverse membersa.

5 point pattern at each end and mid
span

b.

Longitudinal memberb.

5 point pattern on both web and flangea.

Side and end skirts, each 3
locationsa.

5 point pattern at each locationb.

3 longitudinal bands outboard
strakes (2) and centreline strake(1)b.

5 point measurement each band

3.

Hatch Coversa.

PATTERN OFMEASUREMENT
5 point pattern between underdeck
stiffeners over 1 metre length

4.

Hatch Coamings

Each side and end coaming, one band
lower 1/3, one band upper 2/3 ofcoaming

5 point measurement each band i.e. end orside coaming

5.

Topside Water Ballast Tanksa.

Watertight transverse bulkheadsi.

lower 1/3 of bulkheadi.

5 point pattern over 1 sq. metre ofplatingii.

upper 2/3 of bulkheadii.

5 point pattern over 1 sq. metre ofplatingiii.

stiffenersiii

5 point pattern over 1 metre lengthb.

2 representative swash transverse
bulkheadsi.

lower 1/3 of bulkheadi.

5 point pattern over 1 sq. metre ofplatingii.

upper 2/3 of bulkheadii.

5 point pattern over 1 sq. metre ofplatingiii.

stiffenersiii.

5 point pattern over 1 metre lengthc.

3 representative bays of slope
platingi.

lower 1/3 of tanki.

5 point pattern over 1 sq. metre ofplatingii.

upper 2/3 of tankii.

5 point pattern over 1 sq. metre ofplatingd.

Longitudinals, suspect andadjacentd.

5 point pattern both web and flangeover 1 metre length

6.

Main Deck Plating

Suspect plates and adjacent (4)5 point pattern over 1 sq. metre of plating

7.

Main Deck Longitudinals

Minimum of 3 longitudinals where plating
measured

5 point pattern on both web and flange over
1 metre length8.

Web frames/Transverses

Suspect plates

5 point pattern over 1 sq. metre

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Z10.2

Z10.2(cont’d)

TABLE VIII
Sheet 4REQUIREMENTS FOR EXTENT OF THICKNESS MEASUREMENT AT THOSE
AREAS OF SUBSTANTIAL CORROSIONSPECIAL SURVEY OF BULK CARRIERS WITHIN THE CARGO AREA
DOUBLE BOTTOM AND HOPPER STRUCTURE
STRUCTURAL MEMBER
1. Inner/Double Bottom
Plating

EXTENT OF
MEASUREMENT
Suspect plate plus all
adjacent plates

PATTERN OFMEASUREMENT
5 point pattern for each panel
between longitudinals over 1
metre length

2. Inner/Double Bottom
Longitudinals

Three longitudinals whereplates measured+3 measurements in line
across web and 3
measurements on flange

3. Longitudinal Girders orTransverse floorsb.

Suspect platesb.

5 point pattern overabout 1 sq. metre

4. Watertight Bulkheads(WT Floors)a.

lower 1/3 of tanka.

5 point pattern over 1 sq.
metre of platingb.

upper 2/3 of tankb.

5 point pattern alternate
plates over 1 sq. metre ofplating

5. Web Frames

Suspect plate

5 point pattern over 1 sq.
metre of plating

6. Bottom/side shelllongitudinals

Minimum of threelongitudinals in way ofsuspect areas

3 measurements in line
across web
3 measurements on flange

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Z10.2

Z10.2

TABLE VIII
Sheet 5

(cont’d)

REQUIREMENTS FOR EXTENT OF THICKNESS MEASUREMENT AT THOSE
AREAS OF SUBSTANTIAL CORROSIONSPECIAL SURVEY OF BULK CARRIERS WITHIN THE CARGO AREACARGO HOLDSSTRUCTURAL MEMBER
1. Side Shell frames

EXTENT OF
MEASUREMENT
Suspect frame and eachadjacenta.
b.

PATTERN OFMEASUREMENT
At each end and mid span:
5 point pattern of both web andflange5 point pattern within 25 mm ofwelded attachment to both shelland lower slope plate

End ofMain Section
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Z10.2 Annex I

Z10.2

ANNEX I

(cont’d)

GUIDELINES FOR TECHNICAL ASSESSMENT IN CONJUNCTION WITH
PLANNING FOR ENHANCED SURVEYS OF BULK CARRIERSSPECIAL SURVEY - HULL
Contents:
1.

INTRODUCTION

2.

PURPOSE AND PRINCIPLES

3.

2.1

Purpose

2.2

Minimum Requirements

2.3

Timing2.4

Aspects to be Considered

TECHNICAL ASSESSMENT
3.1

General

3.2

Methods

3.2.1

Design Details

3.2.2

Corrosion

3.2.3

Locations for Close-up Survey and Thickness Measurement

REFERENCES
1. IACS Unified Requirement Z10.2, "Hull Surveys of Bulk Carriers."
2.TSCF, "Guidance Manual for the Inspection and Condition Assessment of Tanker
Structures, 1986."
23.TSCF, "Condition Evaluation and Maintenance of Tanker Structures, 1992."
34. IACS Recommendation 76, "Bulk Carriers: Guidelines for Surveys, Assessment andRepair of Hull Structures – Bulk Carriers, 2007 1994."
1.

INTRODUCTION

These guidelines contain information and suggestions concerning technical assessments
which may be of use in conjunction with the planning of enhanced special surveys of bulk
carriers. As indicated in section 5.1.5 of IACS Unified Requirement Z10.2, "Hull Surveys of
Bulk Carriers," (Ref. 1), the guidelines are a recommended tool which may be invoked at thediscretion of an IACS Member Society, when considered necessary and appropriate, in
conjunction with the preparation of the required Survey Programme.

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Z10.2 Annex I

Z10.2(cont’d)2.

PURPOSE AND PRINCIPLES

2.1
PurposeThe purpose of the technical assessments described in these guidelines is to assist in
identifying critical structural areas, nominating suspect areas and in focusing attention on
structural elements or areas of structural elements which may be particularly susceptible to,or evidence a history of, wastage or damage. This information may be useful in nominating
locations, areas, holds and tanks for thickness measurement, close-up survey and tanktesting.
Critical Structural Areas are locations which have been identified from calculations to requiremonitoring or from the service of the subject ship or from similar or sister ships (if available) tobe sensitive to cracking, buckling or corrosion which would impair the structural integrity ofthe ship.
2.2
Minimum Requirements
However, these guidelines may not be used to reduce the requirements pertaining tothickness measurement, close-up survey and tank testing contained in Tables I, II andparagraph 2.5, respectively, of Z10.2; which are, in all cases, to be complied with as aminimum.
2.3
TimingAs with other aspects of survey planning, the technical assessments described in theseguidelines should be worked out by the Owner or operator in cooperation with theClassification Society well in advance of the commencement of the Special Survey, i.e., prior
to commencing the survey and normally at least 12 to 15 months before the survey's
completion due date.
2.4
Aspects to be ConsideredTechnical assessments, which may include quantitative or qualitative evaluation of relative
risks of possible deterioration, of the following aspects of a particular ship may be used as abasis for the nomination of holds, tanks and areas for survey:*Design features such as stress levels on various structural elements, design details
and extent of use of high tensile steel.
*Former history with respect to corrosion, cracking, buckling, indents and repairs forthe particular ship as well as similar vessels, where available.
*Information with respect to types of cargo carried, protection of tanks, and conditionof coating, if any, of holds and tanks.
Technical assessments of the relative risks of susceptibility to damage or deterioration ofvarious structural elements and areas are to be judged and decided on the basis ofrecognized principles and practices, such as may be found in the IACS publication "Bulk
Carriers: Guidelines for Surveys, Assessment and Repair of Hull Structure," (Ref. 43).
3.

TECHNICAL ASSESSMENT

3.1

GeneralThere are three basic types of possible failure which may be the subject of technicalassessment in connection with planning of surveys; corrosion, cracks and buckling. Contact
damages are not normally covered by the survey plan since indents are usually noted inmemoranda and assumed to be dealt with as a normal routine by Surveyors.
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Z10.2 Annex I

Z10.2(cont’d)Technical assessments performed in conjunction with the survey planning process are, in
principle, to be as shown schematically in Figure 1 depicts, schematically, how technicalassessments can be carried out in conjunction with the survey planning process.
The approach is basically an evaluation of the risk based on the knowledge and experience
related to design and corrosion.
The design is to be considered with respect to structural details which may be susceptible tobuckling or cracking as a result of vibration, high stress levels or fatigue.
Corrosion is related to the ageing process, and is closely connected with the quality ofcorrosion protection at newbuilding, and subsequent maintenance during the service life.
Corrosion may also lead to cracking and/or buckling.
3.2

Methods

3.2.1

Design Details

Damage experience related to the ship in question and similar ships, where available, is themain source of information to be used in the process of planning. In addition, a selection of
structural details from the design drawings is to be included.
Typical damage experience to be considered will consist of:-

Number, extent, location and frequency of cracks.

-

Location of buckles.

This information may be found in the survey reports and/or the Owner's files, including theresults of the Owner's own inspections. The defects are to be analyzed, noted and marked on
sketches.
In addition, general experience is to be utilized. For example, Figure 2 shows typical locations
in bulk carriers which experience has shown may be susceptible to structural damage. Also,
reference is to be made to IACS's "Bulk Carriers: Guidelines for Survey, Assessment andRepair," (Ref. 43) which contains a catalogue of typical damages and proposed repair
methods for various bulk carrier structural details.
Such figures are to be used together with a review of the main drawings, in order to comparewith the actual structure and search for similar details which may be susceptible to damage.
An example is shown in Figure 3.
The review of the main structural drawings, in addition to using the above mentioned figures,is to include checking for typical design details where cracking has been experienced. The
factors contributing to damage are to be carefully considered.
The use of high tensile steel (HTS) is an important factor. Details showing good service
experience where ordinary, mild steel has been used may be more susceptible to damage
when HTS, and its higher associated stresses are utilized. There is extensive and, in general,
good experience, with the use of HTS for longitudinal material in deck and bottom structures.
Experience in other locations, where the dynamic stresses may be higher, is less favorable,
e.g. side structures.
In this respect, stress calculations of typical and important components and details, inaccordance with the latest Rules or other relevant methods, may prove useful and are to beconsidered.
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Z10.2 Annex I

Z10.2(cont’d)The selected areas of the structure identified during this process are to be recorded andmarked on the structural drawings to be included in the Survey Programme.
3.2.2 Corrosion
In order to evaluate relative corrosion risks, the following information is generally to beconsidered:-

Usage of Tanks, Holds and Spaces-

Condition of Coatings-

Cleaning Procedures-

Previous Corrosion Damage-

Ballast use and time for Cargo Holds-

Risk of Corrosion in Cargo Holds and Ballast Tanks-

Location of Ballast Tanks Adjacent to Heated Fuel Oil Tanks

Ref. 32 gives definitive examples which can be used for judging and describing coating
condition, using typical pictures of conditions.
For bulk carriers, Ref. 43 is to be used as the basis for the evaluation, together with relevant
information on the anticipated condition of the ship as derived from the information collected
in order to prepare the Survey Programme and the age of the ship.
The various tanks, holds and spaces are to be listed with the corrosion risks nominatedaccordingly.
3.2.3 Locations for Close-up Survey and Thickness Measurement
On the basis of the table of corrosion risks and the evaluation of design experience, thelocations for initial close-up survey and thickness measurement (sections) may be nominated.
The sections subject to thickness measurement are to normally be nominated in tanks, holds
and spaces where corrosion risk is judged to be the highest.
The nomination of tanks, holds and spaces for close-up survey is to, initially, be based onhighest corrosion risk, and is to always include ballast tanks. The principle for the selection
should be that the extent is increased by age or where information is insufficient or unreliable.

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Z10.2 Annex I

Z10.2(cont’d)Input:
Drawings, Reports,
Acceptable Corrosion
Allowance

Collection of Information

Coating Condition
Usage of Tanks

Corrosion Risk

Design Related Risk
Analyse:Hull Damage
This Ship

Coating condition
Usage of Tanks

Corrosion
Damage This
Ship

Analyse:Hull Damage
for Similar Ships
Where Available

Corrosion
Damage Similar
Ship where
Available

Hull Damage:
General Experience
Present Areas
where Damage has
been found andRisks consideredhigh. Mark Sketches
or Drawings

Location for Thickness Measurement and Close-Up Survey

SurveyProgramme

Acceptance byClass & Owner

SurveyFigure 1: Technical Assessment & the Survey Planning Process
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Z10.2 Annex I

Z10.2(cont’d)Figure 2: Typical Locations Susceptible to Structural Damage or Corrosion

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Z10.2 Annex I

Z10.2(cont’d)Figure 3: Typical Damage and Repair Example (Reproduced from Ref: 43)

End ofAnnex I
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Z10.2 Annex II

Z10.2

ANNEX II

(cont’d)

Sheet 1

IACS RECOMMENDED PROCEDURES FOR THICKNESS MEASUREMENTS
OF BULK CARRIERS**
Note: Annex II is recomendatory.

Page 72 of 139

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Z10.2 Annex II

Z10.2

1.

This document is to be used for recording thickness measurements as required by the
IACS Unified Requirement Z10.2.

2.

Reporting forms TM1-BC, TM2-BC, TM3-BC, TM4-BC, TM5-BC, TM6-BC and TM7BC (sheets 4-11) are to be used for recording thickness measurements and the
maximum allowable diminution is to be stated.
The maximum allowable diminution could be stated in an attached document.

3.

The remaining sheets 12-14 are guidance diagrams and notes relating to the reporting
forms and the IACS Unified Requirements for thickness measurement.

4.

The reporting forms shall where appropriate, be supplemented by data presented on
structural sketches.

(cont’d)Page 73 of 139

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Z10.2 Annex II

Z10.2(cont’d)

CONTENTS

Sheet 2

Sheet 1-

Front cover

Sheet 2-

Contents

Sheet 3-General particulars

Sheet 4-

Report TM1-BC for recording the thickness measurement of all deck
plating, all bottom shell plating and side shell plating.

Sheet 5-

Report TM2-BC (i) for recording the thickness measurement of shelland deck plating at transverse sections - strength deck andsheerstrake plating.

Sheet 6-

Report TM2-BC (ii) for recording the thickness measurement of shelland deck plating at transverse sections - shell plating.

Sheet 7-

Report TM3-BC for recording the thickness measurement of
longitudinal members at transverse sections.

Sheet 8-

Report TM4-BC for recording the thickness measurement of transverse
structural members.

Sheet 9-

Report TM5-BC for recording the thickness measurement of cargo holdtransverse bulkheads.

Sheet 10-

Report TM6-BC for recording the thickness measurement of
miscellaneous structural members.

Sheet 11-

Report TM7-BC for recording the thickness measurement of cargo holdtransverse frames.

REPORTS

Sheet 11 bis -Report TM7-BC S31 for recording thickness measurement of cargohold side shell frames under UR S31.

GUIDANCE
Sheet 12-

Bulk Carrier typical transverse section. The diagram includes details of
the items to be measured and the report forms to be used.

Sheet 13-

Transverse section outline. This diagram may be used for those ships
where the diagram on sheet 12 is not suitable.

Sheet 14-

Sketches of bulk carrier showing typical areas for thickness
measurement of cargo hold frames, structural members and transverse
bulkheads in association with close-up survey requirements.

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Z10.2 Annex II
Sheet 3

Z10.2

GENERAL PARTICULARS(cont’d)Ship’s name:IMO number:Class identity number:Port of registry:Gross tons:Deadweight:Date of build:Classification Society:-

Name of Firm performing thickness measurement:Thickness measurement firm certified by:Certificate No:Certificate valid from..................to................
Place of measurement:First date of measurement:Last date of measurement:Special survey/intermediate survey due:-*
Details of measurement equipment:Qualification of operators:Report Number:-consisting of

SheetsNames of operator:-........................

Name of surveyor:-........................

Signature of operator:-........................

Signature of surveyor:-........................

Firm official stamp:-

Classification Society
Official Stamp:-* Delete as appropriate

Page 75 of 139

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Z10.2 Annex II

Z10.2(cont’d)TM1-BC

Report on THICKNESS MEASUREMENT of ALL DECK PLATING, ALL BOTTOM SHELL PLATING
or SIDE SHELL PLATING*(* - delete as appropriate)

Ship’s name.........................
STRAKEPOSITIONPLATE
POSITION
12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

No.
or
Letter

Org.
Thk.
mm

Class Identity No. .........................

Report No. .........................

GaugedForward Reading
Diminution P
Diminution S

GaugedAft Reading
Diminution P

Diminution S

P

mm

P

mm

mm

S

%

mm

Operators Signature.............................................

Page 76 of 139%

Sheet 4S%%

Mean Diminution%
P

S

Maximum
Allowable
Diminutionmm

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II

Z10.2(cont’d)

NOTES
1.

2.

This report is to be used for recording the thickness measurement of:A-

All strength deck plating within cargo length area.

B-

Keel, bottom shell plating and bilge plating within the cargo length area.

C-

Side shell plating that is all wind and water strakes within the cargo length area.

D-

Side shell plating that is selected wind and water strakes outside the cargo
length area.

The strake position is to be cleared indicates as follows:2.1

For strength deck indicate the number of the strake of plating inboard from thestringer plate.

2.2

For bottom plating indicate the number of the strake of plating outboard fromthe keel plate.

2.3

For side shell plating give number of the strake of plating sheerstrake andletter as shown on shell expansion.

3.

Only the deck plating strakes outside line of openings are to be recorded.

4.

Measurements are to be taken at the forward and aft areas of all plates and the single
measurements recorded are to represent the average of multiple measurements.

5.

The maximum allowable diminution could be stated in an attached document.

Page 77 of 139

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Z10.2 Annex II

Z10.2 TM2-BC (I)(cont’d)Report on THICKNESS MEASUREMENT OF SHELL AND DECK PLATING(one, two or three transverse sections)

Ship’s name.........................

Sheet 5Class Identity No. .........................

Report No. .........................

STRENGTH DECK AND SHEERSTRAKE PLATINGFIRST TRANSVERSE SECTION AT FRAME NUMBER
STRAKEPOSITION
StringerPlate
1st strake
inboard
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
centrestrakesheerstrakeTOPSIDE
TOTAL

No.
or
LetterSECOND TRANSVERSE SECTION AT FRAME NUMBER

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

%

No.
or
Letter

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

Operators Signature.............................................

Page 78 of 139

S

%

%

THIRD TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023%

Z10.2 Annex II

Z10.2(cont’d)NOTES
1.

This report is to be used for recording the thickness measurement of:Strength deck plating and sheerstrake plating transverse sections:Two or three section within the cargo length area, comprising of the structural
items (1), (2) and (3) as shown on the diagram of typical transverse section.

2.

Only the deck plating strakes outside the line of openings are to be recorded.

3.

The topside area comprises deck plating, stringer plate and sheerstrake (including
rounded gunwales).

4.

The exact frame station of measurement is to be stated.

5.

The single measurements recorded are to represent the average of multiple
measurements.

6.

The maximum allowable diminution could be stated in an attached document.

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Z10.2 Annex II

Z10.2(cont’d)TM2-BC (II)

Report on THICKNESS MEASUREMENT OF SHELL AND DECK PLATING(one, two or three transverse sections)

Ship’s name.........................

Sheet 6Class Identity No. .........................

Report No. .........................

SHELL PLATINGFIRST TRANSVERSE SECTION AT FRAME NUMBER
STRAKEPOSITION
1st below
sheer
strake
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
keel strake
BOTTOM
TOTAL

No.
or
LetterSECOND TRANSVERSE SECTION AT FRAME NUMBER

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

%

No.
or
Letter

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

Operators Signature.............................................

Page 80 of 139

S

%

%

THIRD TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023%

Z10.2 Annex II

Z10.2(cont’d)NOTES
1.

This report is to be used for recording the thickness measurement of:Shell plating transverse sections:Two or three sections within cargo length area comprising of the structural
items (4), (5), (6) and (7) as shown on the diagram of typical transverse
section.

2.

The bottom area comprises keel, bottom and bilge plating.

3.

The exact frame station of measurement is to be stated.

4.

The single measurements recorded are to represent the average of multiple
measurements.

5.

The maximum allowable diminution could be stated in an attached document.

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Z10.2 Annex II

Z10.2(cont’d)TM3-BC

Report on THICKNESS MEASUREMENT OF LONGITUDINAL MEMBERS(one, two or three transverse sections)

Ship’s name.........................

Class Identity No. .........................

FIRST TRANSVERSE SECTION AT FRAME NUMBER
STRUCTURAL
MEMBER

Item
No.

Sheet 7

SECOND TRANSVERSE SECTION AT FRAME NUMBER

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

Report No. ........................

%

Item
No.

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

Operators Signature.............................................

S

%

%

THIRD TRANSVERSE SECTION AT FRAME NUMBER
Item
No.

Org.
Thk.

Max.
Alwb.
Dim.

GaugedDiminution
P

Diminution
S

mm

mm

P

mm

mm

S

%

NOTES – See Reverse

Page 82 of 139

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Z10.2 Annex II

Z10.2(cont’d)NOTES
1.

This report is to be used for recording the thickness measurement of:Longitudinal Members at transverse sections:Two, or three sections within the cargo length area, comprising of the appropriate
structural items (8) to (20) as shown on diagram of typical transverse section.

2.

The exact frame station of measurement is to be stated.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The maximum allowable diminution could be stated in an attached document.

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Z10.2 Annex II

Z10.2TM4-BC(cont’d)Report on THICKNESS MEASUREMENT OF TRANSVERSE STRUCTURAL MEMBERS
In the double bottom, hopper side and topside water ballast tanks

Ship’s name.........................

Class Identity No. .........................

Sheet 8

Report No. ........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE:
STRUCTURAL MEMBER

ITEM

Original
Thickness
mm

Max.
Alwb.
Dim.
mm

Operators Signature.............................................

Page 84 of 139

GaugedP

Diminution
P
S

mm

Diminution
S
%

mm

%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II

Z10.2(cont’d)NOTES
1.

This report is to be used for recording the thickness measurement of transverse
structural members, comprising of the appropriate structural items (23) to (25) asshown on diagram of typical transverse section, sheet 12 of this document.

2.

Guidance for areas if measurement is indicated on the diagrams shown on sheet 14of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The maximum allowable diminution could be stated in an attached document.

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Z10.2 Annex II

Z10.2 TM5-BC(cont’d)Report on THICKNESS OF CARGO HOLD TRANSVERSE BULKHEADS

Ship’s name.........................

Sheet 9Class Identity No. .........................

LOCATION OF STRUCTURE:

Report No. ........................
FRAME NO.:STRUCTURAL COMPONENT (PLATING/STIFFENER)
Original
Thickness
mm

Max.
Alwb.
Dim.
mm

Operators Signature.............................................

Page 86 of 139

GaugedPort

Starboard

Diminution
P
mm

Diminution
S
%

mm

%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II

Z10.2

NOTES

(cont’d)1.

This report form is to be used for recording the thickness measurement of cargo holdtransverse bulkheads.

2.

Guidance for areas of measurement is indicated on the diagrams shown on sheet 14of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The maximum allowable diminution could be stated in an attached document.

Page 87 of 139

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Z10.2 Annex II

Z10.2 TM6-BC(cont’d)Report on THICKNESS MEASUREMENT OF MISCELLANEOUS STRUCTURAL MEMBERS

Ship’s name.........................

Class Identity No. .........................

Sheet 10
Report No. ........................

STRUCTURAL MEMBER:

SKETCHLOCATION OF STRUCTURE:
Description

Org.
Thk.
mm

Max.
Alwb.
Dim.
mm

GaugedDiminution
P

Diminution
S

P

mm

mm

S

Operators Signature.............................................

Page 88 of 139%%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II

Z10.2(cont’d)NOTES
1.

This report is to be used for recording the thickness measurement of miscellaneous
structural members including the structural items (28), (29) and (30) as shown on
diagram of typical transverse section, sheet 12 of this document.

2.

Guidance for areas of measurement is indicated on sheet 14 of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The maximum allowable diminution could be stated in an attached document.

Page 89 of 139

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Z10.2 Annex II

Z10.2 TM7-BC(cont’d)Report on THICKNESS MEASUREMENT OF CARGO HOLD TRANSVERSE FRAMES

Ship’s name.........................

Sheet 11Class Identity No. .........................

Report No. ........................

CARGO HOLD NO.
UPPER PARTFRAME
NUMBER

Org.
Thk.
mm

Max.
Alwb.
Dim.
mm

MID PART

GaugedDiminution
P

Diminution
S

Org.
Thk.

P

mm

mm

mm

S

%

%

Operators Signature.............................................

Page 90 of 139

Max.
Alwb.
Dim.
mm

LOWER PART

GaugedDiminution
P

Diminution
S

Org.
Thk.

P

mm

mm

mm

S

%

%

Max.
Alwb.
Dim.
mm

GaugedDiminution
P

Diminution
S

P

mm

mm

S

%

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023%

Z10.2 Annex II

Z10.2

NOTES

(cont’d)1.

This report is to be used for recording the thickness measurement of:Cargo Hold Transverse Frames
Structural item number 34 as shown on the diagram of typical transverse section,
sheet 12 of this document.

2.

Guidance for areas of measurement is indicated on the diagrams shown on sheet 14of this document.
The single measurements recorded are to represent the average of multiple
measurements.

3.

The location and pattern of measurements is to be indicated on the sketches of holdframes shown below.

4.

The maximum allowable diminution could be stated in an attached document.

Page 91 of 139

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Z10.2 Annex II

Z10.2(cont’d)TM7-BC S31

Report on THICKNESS MEASUREMENT OF CARGO HOLD SIDE SHELL FRAMES

Ship’s name.........................

Class Identity No. .........................

Report No. ........................

CARGO HOLD NO.:
ZONE A
FRAME
NO

Org.
Thk.
mm

Side:

ZONE B

tREN

tCOAT

tM

Diminution

mm

mm

mm

mm

%

Org.
Thk.
mm

tCOAT

tM

Diminution

mm

mm

mm

mm

Page 92 of 139(Port / stb.)

ZONE CtREN

Operators Signature.............................................

Sheet 11 bis

%

Org.
Thk.
mm

ZONE D

tREN

tCOAT

tM

Diminution

mm

mm

mm

mm

%

Org.
Thk.
mm

tREN

tCOAT

tM

Diminution

mm

mm

mm

mm

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023%

Z10.2 Annex II

Z10.2

NOTES

(cont’d)1.

This report is to be used for recording the thickness measurement of:Cargo Hold Transverse Frames for application of UR S31

2.

Guidance for areas of measurement is provided in Annex V.

3.

The maximum allowable diminution could be stated in an attached document.

Page 93 of 139

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Z10.2 Annex II
Sheet 12Z10.2
(cont’d)Page 94 of 139

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II
Sheet 13

Z10.2
(cont’d)Page 95 of 139

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II

Z10.2

Sheet 14(cont’d)Page 96 of 139

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II (CSR)

Z10.2

ANNEX II (CSR)(cont’d)

Sheet 1

IACS RECOMMENDED PROCEDURES FOR THICKNESS MEASUREMENTS
OF BULK CARRIERS BUILT UNDER IACS COMMON STRUCTURAL RULES**
Note: Annex II (CSR) is recomendatory.

Page 97 of 139

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Z10.2 Annex II (CSR)

Z10.2 1.
(cont’d)This document is to be used for recording thickness measurements of bulk carriers
built under IACS Common Structural Rules as required by the IACS Unified
Requirement Z10.2.

2.

Reporting forms TM1-BC(CSR), TM2-BC(CSR) (i) and (ii), TM3-BC(CSR), TM4BC(CSR), TM5-BC(CSR), TM6-BC(CSR) and TM7-BC(CSR) (sheets 4-11) are to be
used for recording thickness measurements. The as-built thickness and the voluntary
thickness addition and renewal thickness (minimum allowable thickness) are to bestated in the said forms.

3.

The remaining sheets 12-14 are guidance diagrams and notes relating to the reporting
forms and the IACS Unified Requirements for thickness measurement.

Page 98 of 139

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Z10.2 Annex II (CSR)

Z10.2(cont’d)

CONTENTS

Sheet 2

Sheet 1-

Front cover

Sheet 2-

Contents

Sheet 3-General particulars

Sheet 4-

Report TM1-BC(CSR) for recording the thickness measurement of alldeck plating, all bottom plating and side shell plating.

Sheet 5-

Report TM2-BC(CSR) (i) for recording the thickness measurement ofshell and deck plating at transverse sections - strength deck andsheerstrake plating.

Sheet 6-

Report TM2-BC(CSR) (ii) for recording the thickness measurement ofshell plating at transverse sections.

Sheet 7-

Report TM3-BC(CSR) for recording the thickness measurement of
longitudinal members at transverse sections.

Sheet 8-

Report TM4-BC(CSR) for recording the thickness measurement oftransverse structural members.

Sheet 9-

Report TM5-BC(CSR) for recording the thickness measurement ofcargo hold transverse bulkheads.

Sheet 10-

Report TM6-BC(CSR) for recording the thickness measurement of
miscellaneous structural members.

Sheet 11-

Report TM7-BC(CSR) for recording the thickness measurement ofcargo hold transverse frames.

Sheet 12-

Bulk Carrier typical transverse section. The diagram includes details of
the items to be measured and the report forms to be used.

Sheet 13-

Transverse section outline. This diagram may be used for those ships
where the diagram on sheet 12 is not suitable.

Sheet 14-

Sketches of bulk carrier showing typical areas for thickness
measurement of cargo hold frames, structural members and transverse
bulkheads in association with close-up survey requirements.

REPORTSGUIDANCE

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Z10.2 Annex II (CSR)
Sheet 3

Z10.2

GENERAL PARTICULARS(cont’d)Ships name:IMO number:Class identity number:Port of registry:Gross tons:Deadweight:Date of build:Classification Society:-

Name of Firm performing thickness measurement:Thickness measurement firm certified by:Certificate No:Certificate valid from..................to................
Place of measurement:First date of measurement:Last date of measurement:Special survey/intermediate survey due:-*
Details of measurement equipment:Qualification of operators:Report Number:-consisting of

SheetsNames of operator:-........................

Name of surveyor:-........................

Signature of operator:-........................

Signature of surveyor:-........................

Firm official stamp:-

Classification Society
Official Stamp:-* Delete as appropriate

Page 100 of 139

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Z10.2 Annex II (CSR)
TM1-BC(CSR)

Z10.2(cont’d)Report on THICKNESS MEASUREMENT of ALL DECK PLATING, ALL BOTTOM PLATING
or SIDE SHELL PLATING*(* - delete as appropriate)

Ship’s name.........................
STRAKEPOSITIONPLATE
POSITION

No.
or
LetterAs Built
Thk.
mm

Class Identity No.........................

Voluntary
Thickness
Additionmm

RenewalThicknessmm

12th forward
11th
10th
9th
8th
7th
6th
5th
4th
3rd
2nd
1st
Amidships
1st aft
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th

(a)

Forward Reading
Gauged Thk.
Remaining Corr.
mm
Addition, mm(b1)(c1)=(b1)-(a)P
S
PS

Operators Signature.............................................

Sheet 4

Report No.........................

Gauged Thk.
mm
(b2)
P
S

Aft Reading
Remaining Corr.
Addition, mm(c2)=(b2)-(a)P
S

Mean Remaining Corr.
Addition, mm[(c1)+(c2)]/2
PS

NOTES – See Reverse

Page 101 of 139

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Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM1-BC(CSR)
1.

2.

This report is to be used for recording the thickness measurement of:A-

All strength deck plating within cargo length area.

B-

Keel, bottom shell plating and bilge plating within the cargo length area.

C-

Side shell plating that is all wind and water strakes within the cargo length area.

D-

Side shell plating that is selected wind and water strakes outside the cargo
length area.

The strake position is to be clearly indicated as follows:2.1

For strength deck indicate the number of the strake of plating inboard from thestringer plate.

2.2

For bottom plating indicate the number of the strake of plating outboard fromthe keel plate.

2.3

For side shell plating give number of the strake of plating sheerstrake andletter as shown on shell expansion.

3.

Only the deck plating strakes outside line of openings are to be recorded.

4.

Measurements are to be taken at the forward and aft areas of all plates and the single
measurements recorded are to represent the average of multiple measurements.

5.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

Page 102 of 139

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM2-BC(CSR) (i)Report on THICKNESS MEASUREMENT OF SHELL AND DECK PLATING(one, two or three transverse sections)

Ship’s name.........................

Sheet 5Class Identity No. .........................

Report No. .........................

STRENGTH DECK AND SHEERSTRAKE PLATINGFIRST TRANSVERSE SECTION AT FRAME NUMBER
STRAKEPOSITION
StringerPlate
1st strake
inboard
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
centrestrakesheerstrakeTOPSIDE
TOTAL

No.
or
Letter

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

SECOND TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

As
Built
Thk.
mm

Operators Signature.............................................

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

THIRD TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)NOTES – See Reverse

Page 103 of 139

IACS Req. 1992/Rev.37 2023

S

Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM2-BC(CSR) (i)1.

This report is to be used for recording the thickness measurement of:Strength deck plating and sheerstrake plating transverse sections:One, two or three sections within the cargo length area, comprising of thestructural items (1), (2) and (3) as shown on the diagram of typical transverse
section.

2.

Only the deck plating strakes outside the line of openings are to be recorded.

3.

The topside area comprises deck plating, stringer plate and sheerstrake (including
rounded gunwales).

4.

The exact frame station of measurement is to be stated.

5.

The single measurements recorded are to represent the average of multiple
measurements.

6.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM2-BC(CSR) (ii)

Report on THICKNESS MEASUREMENT OF SHELL PLATING(one, two or three transverse sections)

Ship’s name.........................

Sheet 6Class Identity No. .........................

Report No. .........................

SHELL PLATINGFIRST TRANSVERSE SECTION AT FRAME NUMBER
STRAKEPOSITION
1st below
sheer
strake
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
11th
12th
13th
14th
15th
16th
17th
18th
19th
20th
Keel strake
BOTTOM
TOTAL

No.
or
Letter

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

SECOND TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

As
Built
Thk.
mm

Operators Signature.............................................

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

THIRD TRANSVERSE SECTION AT FRAME NUMBER
No.
or
Letter

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)NOTES – See Reverse

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S

Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM2-BC(CSR) (ii)1.

This report is to be used for recording the thickness measurement of:Shell plating transverse sections:One, two or three sections within cargo length area comprising of the structural
items (4), (5), (6) and (7) as shown on the diagram of typical transverse
section.

2.

The bottom area comprises keel, bottom and bilge plating.

3.

The exact frame station of measurement is to be stated.

4.

The single measurements recorded are to represent the average of multiple
measurements.

5.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM3-BC(CSR)

Report on THICKNESS MEASUREMENT OF LONGITUDINAL MEMBERS(one, two or three transverse sections)

Ship’s name.........................

Class Identity No. .........................

FIRST TRANSVERSE SECTION AT FRAME NUMBER
STRUCTURAL
MEMBER

Item
No.

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

Report No. ........................

SECOND TRANSVERSE SECTION AT FRAME NUMBER
Item
No.

As
Built
Thk.
mm

Operators Signature.............................................

Vol.
Thk.
Add.
mm

Sheet 7

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)S

THIRD TRANSVERSE SECTION AT FRAME NUMBER
Item
No.

As
Built
Thk.
mm

Vol.
Thk.
Add.
mm

Ren.
Thk.
mm
(a)

Gauged
Thk.
mm
(b)

P

S

Remaining Corr.
Addition, mm

P(b)-(a)NOTES – See Reverse

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Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM3-BC(CSR)
1.

This report is to be used for recording the thickness measurement of:Longitudinal Members at transverse sections:One, two, or three sections within the cargo length area, comprising of theappropriate structural items (8) to (20) as shown on diagram of typicaltransverse section.

2.

The exact frame station of measurement is to be stated.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM4-BC(CSR)

Report on THICKNESS MEASUREMENT OF TRANSVERSE STRUCTURAL MEMBERS
In the double bottom, hopper side and topside water ballast tanks

Ship’s name.........................

Class Identity No. .........................

Sheet 8

Report No. ........................

TANK DESCRIPTION:
LOCATION OF STRUCTURE
STRUCTURAL MEMBERITEM

As Built
Thicknessmm

Voluntary
Thickness
Additionmm

Operators Signature.............................................

RenewalThicknessmm(a)Gauged Thickness
mm
(b)

P

S

Remaining Corr. Additionmm(b)-(a)PS

NOTES – See Reverse

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Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM4-BC(CSR)
1.

This report is to be used for recording the thickness measurement of transverse
structural members, comprising of the appropriate structural items (23) to (25) asshown on diagram of typical transverse section.

2.

Guidance for areas if measurement is indicated on the diagrams shown on sheet 14of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM5-BC(CSR)

Report on THICKNESS OF CARGO HOLD TRANSVERSE BULKHEADS

Ship’s name.........................

Sheet 9Class Identity No. .........................

Report No. ........................

HOLD DESCRIPTION:
LOCATION OF STRUCTURE:
STRUCTURAL COMPONENT(PLATING/STIFFENER)

FRAME NO.:As Built
Thicknessmm

Voluntary
Thickness
Additionmm

Operators Signature.............................................

RenewalThicknessmm(a)Gauged Thickness
mm
(b)

P

S

Remaining Corr. Additionmm(b)-(a)PS

NOTES – See Reverse

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Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM5-BC(CSR)
1.

This report form is to be used for recording the thickness measurement of cargo holdtransverse bulkheads.

2.

Guidance for areas of measurement is indicated on the diagrams shown on sheet 14of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM6-BC(CSR)

Report on THICKNESS MEASUREMENT OF MISCELLANEOUS STRUCTURAL MEMBERS

Ship’s name.........................

Class Identity No. .........................

Sheet 10
Report No. ........................

STRUCTURAL MEMBER:

SKETCHLOCATION OF STRUCTURE:
Description

As
Built
Thk.
mm

Voluntary
Thickness
Additionmm

Renewal Gauged Thickness
Thickness
mm
mm
(b)
(a)

P

Operators Signature.............................................

Page 113 of 139

S

Remaining Corr. Additionmm(b)-(a)PS

NOTES – See Reverse

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Z10.2 Annex II (CSR)

Z10.2(cont’d)NOTES TO REPORT TM6-BC(CSR)
1.

This report is to be used for recording the thickness measurement of miscellaneous
structural members including the structural items (28), (29) and (30) as shown on
diagram of typical transverse section, sheet 12 of this document.

2.

Guidance for areas of measurement is indicated on sheet 14 of this document.

3.

The single measurements recorded are to represent the average of multiple
measurements.

4.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)TM7-BC(CSR)

Report on THICKNESS MEASUREMENT OF CARGO HOLD TRANSVERSE FRAMES

Ship’s name.........................

Class Identity No. .........................

Sheet 11
Report No. ........................

CARGO HOLD NO.
UPPER PARTFRAME
NUMBER

As
Built
Thk
mm

Volun.
Thk.
Add.
mm

MID PART

Renewal Gauged
Thickness Thickness
mm
mm
(b)
(a)

P

S

Remaining Corr.
Additionmm(b)-(a)

P

S

As
Built
Thk
mm

Operators Signature.............................................

Page 115 of 139

Volun.
Thk.
Add.
mm

LOWER PART

Renewal Gauged
Thickness Thickness
mm
mm
(b)
(a)

P

S

Remaining Corr.
Additionmm(b)-(a)PS

As Volun.
Built Thk.
Add.
Thk
mm
mm

Renewal Gauged
Thickness Thickness
mm
mm
(b)
(a)

P

S

Remaining Corr.
Additionmm(b)-(a)PS

NOTES – See Reverse

IACS Req. 1992/Rev.37 2023

Z10.2 Annex II (CSR)

Z10.2

NOTES TO REPORT TM7-BC(CSR)

Sheet 11 bis(cont’d)1.

This report is to be used for recording the thickness measurement of:Cargo Hold Transverse Frames
Structural item number 34 as shown on the diagram of typical transverse section.

2.

Guidance for areas of measurement is indicated on the diagrams shown on sheet 14of this document.
The single measurement recorded are to represent the average of multiple
measurements.

3.

The location and pattern of measurements is to be indicated on the sketches of holdframes shown below.

4.

The remaining corrosion addition is to be recorded with result of gauged thickness
minus renewal thickness. If the result is negative, the structure in way shall berenewed, and the mark “R” is to be indicated in the right-hand column. If the result is
between 0 and 0.5 mm (0 included), the structure in way shall be additional gauged,
and the mark “S” is to be indicated in the right-hand column.

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Z10.2 Annex II (CSR)

Z10.2

Sheet 12

Thickness Measurement - Bulk Carriers(cont’d)Typical transverse section including longitudinal and transverse members

Report on TM2-BC(CSR) (i) & (ii)

Report on TM3-BC(CSR)

Report on TM6-BC(CSR)

1. Strength deck plating

8. Deck longitudinals

17. Inner bottom plating

28. Hatch coamings

2. Stringer plate

9. Deck girders

18. Inner bottom longitudinals

29. Deck plating between
hatches

3. Sheerstrake

10. Sheerstrake longitudinals

19. Hopper plating

30. Hatch covers

20. Hopper longitudinals

31.

21.

32.
33.

4. Side shell plating
5. Bilge plating

11. Topside tank sloping
plating
12. Topside tank sloping
plating longitudinals

6. Bottom plating

13. Bottom longitudinals

22.

7. Keel plate

14. Bottom girders

Report on TM4-BC(CSR)

15. Bilge longitudinals
16. Side shell longitudinals, ifany

23. Double bottom tankfloors
24. Top side tanktransverses
25. Hopper side tanktransverses
26.

Report on TM7-BC(CSR)
34.Cargo hold frames

27.

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Z10.2 Annex II (CSR)
Sheet 13

Z10.2

Thickness Measurement - Bulk Carriers(cont’d)

Transverse section outline: The diagram may be used for those ships where thediagrams on sheet 12 are not suitable.

Report on TM2-BC(CSR) (i) & (ii)

Report on TM3-BC(CSR)

Report on TM6-BC(CSR)

1. Strength deck plating

8. Deck longitudinals

17. Inner bottom plating

28. Hatch coamings

2. Stringer plate

9. Deck girders

18. Inner bottom longitudinals

29. Deck plating between
hatches

3. Sheerstrake

10. Sheerstrake longitudinals

19. Hopper plating

30. Hatch covers

20. Hopper longitudinals

31.

21.

32.
33.

4. Side shell plating
5. Bilge plating

11. Topside tank sloping
plating
12. Topside tank sloping
plating longitudinals

6. Bottom plating

13. Bottom longitudinals

22.

7. Keel plate

14. Bottom girders

Report on TM4-BC(CSR)

15. Bilge longitudinals
16. Side shell longitudinals, ifany

23. Double bottom tankfloors
24. Top side tanktransverses
25. Hopper side tanktransverses
26.

Report on TM7-BC(CSR)
34.Cargo hold frames

27.

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Z10.2 Annex II (CSR)

Z10.2(cont’d)Close-up Survey and Thickness Measurement Areas

Sheet 14

Typical transverse section
Areas A, B and D

Thickness to be reported on TM3-BC(CSR), TM4-BC(CSR),
TM6-BC(CSR) and TM7-BC(CSR) as appropriate
Thickness to be reported on TM3-BC(CSR), TM4-BC(CSR),
TM6-BC(CSR) and TM7-BC(CSR) as appropriate

A cargo hold, transverse bulkhead
Area C

Thickness to be reported on TM5-BC(CSR)

Typical areas of deck plating inside lineof hatch openings between cargo hold hatches
Area E

Thickness to be reported on TM6-BC(CSR)

Page 119 of 139

End ofAnnex II
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Z10.2 Annex III

Z10.2(cont’d)

ANNEX IIIGUIDELINES FOR THE GAUGING OF THE VERTICALLY CORRUGATED TRANSVERSE
WATERTIGHT BULKHEAD BETWEEN HOLDS NOS. 1 AND 2
1.

Gauging is necessary to determine the general condition of the structure and to define
the extent of possible repairs and/or reinforcements of the vertically corrugatedtransverse watertight bulkhead for verification of the compliance with UR S19.

2.

Taking into account the buckling model applied in UR S19 in the evaluation ofstrength of the bulkhead, it is essential to determine the thickness diminution at thecritical levels shown in Figures 1 and 2.

3.

The gauging is to be carried out at the levels as described below. To adequately
assess the scantlings of each individual vertical corrugation, each corrugation flange,
web, shedder plate and gusset plate within each of the levels given below are to begauged.
Level (a)Ships without lower stool (see Figure 1):

Locations:•
The mid-breadth of the corrugation flanges at approximately 200 mm above
the line of shedder plates;•
The middle of gusset plates between corrugation flanges, where fitted;•
The middle of the shedder plates;•
The mid-breadth of the corrugation webs at approximately 200 mm above theline of shedder plates.
Level (b)Ships with lower stool (see Figure 2):

Locations:•
The mid-breadth of the corrugation flanges at approximately 200 mm above
the line of shedder plates;•
The middle of gusset plates between corrugation flanges, where fitted;•
The middle of the shedder plates;•
The mid-breadth of the corrugation webs at approximately 200 mm above theline of shedder plates.
Level (c)Ships with or without lower stool (see Figures 1 and 2):

Locations:•
The mid-breadth of the corrugation flanges and webs at about the mid-heightof the corrugation.
4.

Where the thickness changes within the horizontal levels, the thinner plate is to begauged.

5.

Steel renewal and/or reinforcement is to comply with S19.

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Z10.2 Annex III

Z10.2(cont’d)

End ofAnnex III

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Z10.2 Annex IV

Z10.2

ANNEX IV

(cont’d)

ADDITIONAL ANNUAL SURVEY REQUIREMENTS FOR THE FOREMOSTCARGO HOLD OF SHIPS SUBJECT TO SOLAS XII/9.1
1

General

1.1
In the case of Bulk Carrier over 5 years of age, the Annual Survey is to include, in
addition to the requirements of the Annual Surveys prescribed in chapter 3, an examination of
the following items:
1.2

Extent of Survey

1.2.1

For bulk carriers of 5 - 15 years of age:a)
An Overall Survey of the foremost cargo hold, including Close-up Survey of sufficient
extent, minimum 25% of frames, is to be carried out to establish the condition of:-

Shell frames including their upper and lower end attachments, adjacent shell plating,and transverse bulkheads.

-

Suspect areas identified at previous surveys (see 1.2.9 of UR Z10.2).

b)Where considered necessary by the surveyor as a result of the Overall and Close-up
Survey as described in a) above, the survey is to be extended to include a Close-up Surveyof all of the shell frames and adjacent shell plating of the cargo hold.
1.2.2

For bulk carriers exceeding 15 years of age:a)
An Overall Survey of the foremost cargo hold, including Close-up Survey is to be
carried out to establish the condition of:-

All shell frames including their upper and lower end attachments, adjacent shell
plating, and transverse bulkheads.

-

Suspect areas identified at previous surveys (see 1.2.9 of UR Z10.2).

1.3

Extent of Thickness Measurement

1.3.1 Thickness measurement is to be carried out to an extent sufficient to determine bothgeneral and local corrosion levels at areas subject to Close-up Survey, as described in 1.2.1a) and 1.2.2. a) above.
The minimum requirement for thickness measurements are suspect areas identified at
previous surveys (see 1.2.9 of UR Z10.2).
Where Substantial Corrosion as defined in chapter 1.2.9 is found, the extent of thickness
measurements should be increased with the requirements of Table VIII.
1.3.2 The thickness measurement may be dispensed with provided the surveyor is satisfied
by the Close-up Survey, that there is no structural diminution and the Protective Coatingwhere fitted remains effective.

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Z10.2 Annex IV

Z10.2 1.4
(cont’d)Special Consideration

1.4.1 Where the protective coating in the foremost cargo hold, as defined by Z.9 is found to
be in GOOD condition, the extent of close-up surveys and thickness measurements may be
specially considered.
Explanatory note:
For existing bulk carriers, where owners may elect to coat or recoat cargo holds as noted
above, consideration may be given to the extent of the close-up and thickness measurement
surveys. Prior to the coating of cargo holds of existing ships, scantlings should be ascertainedin the presence of a surveyor.

End ofAnnex IV

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Z10.2 Annex V

Z10.2

ANNEX V

(cont’d)

GUIDELINES FOR THE GAUGING OF SIDE SHELL FRAMES AND BRACKETS
IN SINGLE SIDE SKIN BULK CARRIERS REQUIRED TO COMPLY WITH UR S31
1.

GeneralGauging is necessary to determine the general condition of the structure and to define theextent of possible steel renewals or other measures for the webs and flanges of side shellframes and brackets for verification of the compliance with UR S31.
2.

Zones of Side Shell Frames and Brackets

For the purpose of steel renewal, sand blasting and coating, four zones A, B, C and D are
defined, as shown in Figure 1.
Zones A & B are considered to be the most critical zones.

Figure 1
3.

Zones of Side Shell Frames and Brackets

Pitting and grooving

Pits can grow in a variety of shapes, some of which would need to be ground before
assessment.
Pitting corrosion may be found under coating blisters, which must be removed before
inspection.
To measure the remaining thickness of pits or grooving the normal ultrasonic transducer(generally 10mm diameter) will not suffice. A miniature transducer (3 to 5 mm diameter) must
be used. Alternatively the gauging firm must use a pit gauge to measure the depth of the pits
and grooving and calculate the remaining thickness.

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Z10.2 Annex V

Z10.2 3.1
(cont’d)Assessment based upon Area

This is the method specified in S31.2.5 and is based upon the intensity determined from
Figure 2 below.

Figure 2

Pitting intensity diagrams (from 5% to 25% intensity)

If pitting intensity is higher than 15% in an area (see Figure 2), then thickness measurements
are to be taken to check the extent of the pitting corrosion. The 15% is based upon pitting or
grooving on only one side of the plate.
In cases where pitting is evident as defined above (exceeding 15 %) then an area of 300mm
diameter or more (or, where this is impracticable on the frame flange or the side shell, hoppertank plating or topside tank plating attached to the side frame, an equivalent rectangular area),at the most pitted part, is to be cleaned to bare metal, and the thickness measured in way of
the five deepest pits within the cleaned area. The least thickness measured in way of any ofthese pits is to be taken as the thickness to be recorded.
The minimum acceptable remaining thickness in any pit or groove is equal to:-

75% of the as built thickness, for pitting or grooving in the cargo hold side frame webs
and flanges.
70% of the as built thickness, for pitting or grooving in the side shell, hopper tank andtopside tank plating attached to the cargo hold side frame, over a width up to 30mm
from each side of it.

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Z10.2 Annex V

Z10.2 4.
(cont’d)Gauging methodology

Numbers of side frames to be measured are equivalent to those of Special Survey orIntermediate Survey corresponding to the ship’s age. Representative thickness
measurements are to be taken for each zone as specified below.

Special consideration to the extent of the thickness measurements may be given by theClassification Society, if the structural members show no thickness diminution with respect tothe as built thicknesses and the coating is found in "as-new" condition (i.e., without
breakdown or rusting).
Where gauging readings close to the criteria are found, the number of hold frames to bemeasured is to be increased.
If renewal or other measures according to S31 are to be applied on individual frames in ahold, then all frames in that hold are to be gauged.
There is a variety of construction methods used for side shell frames in bulk carriers. Somehave faceplates (T sections) on the side shell frames, some have flanged plates and somehave bulb plates. The use of faceplates and flanged sections is considered similar for
gauging purposes in that both the web and faceplate or web and flange plate are to begauged. If bulb plate has been used, then web of the bulb plate is to be gauged in the normalmanner and the sectional modulus has to be specially considered if required.
4.1

Gaugings for Zones A, B & D

Web plating
The gauging pattern for Zones A, B & D are to be a five point pattern. See Figure 3. The 5
point pattern is to be over the depth of the web and the same area vertically. The gauging
report is to reflect the average reading.

Figure 3

Typical 5 point pattern on the web plate

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Z10.2 Annex V

Z10.2 4.2
(cont’d)Gaugings for Zone C

Web plating
Depending upon the condition of the web in way of Zone C, the web may be measured bytaking 3 readings over the length of Zone C and averaging them. The average reading is tobe compared with the allowable thickness. If the web plating has general corrosion then thispattern should be expanded to a five point pattern as noted above.
4.3

Gaugings for section a) and b) (flanges and side shell plating)

Where the lower bracket length or depth does not meet the requirements in UR S12(Rev.3),
gaugings are to be taken at sections a) and b) to calculate the actual section modulus
required in UR S31.3.4. See Figure 4. At least 2 readings on the flange/faceplate are to betaken in way of each section. At least one reading of the attached shell plating is to be taken
on each side of the frame (i.e. fore and aft) in way of section a) and section b).

Figure 45Sections a) and b)

Report on Thickness Measurement of Cargo Hold Frames

See form TM7-BC S31 (sheet 11 bis).

End ofAnnex V
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Z10.2 Annex VI

Z10.2(cont’d)

ANNEX VI

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Z10.2 Annex VIA

Z10.2

ANNEX VIA

(cont’d)SURVEY PROGRAMME
Basic information and particulars
Name of ship:
IMO number:
Flag State:
Port of registry:
Gross tonnage:
Deadweight (metric tonnes):
Length between perpendiculars (m):Shipbuilder:
Hull number:Classification Society:
Class ID:
Date of build of the ship:
Owner:
Thickness measurement firm:
1

Preamble

1.1

Scope

1.1.1 The present survey programme covers the minimum extent of overall surveys, close-up
surveys, thickness measurements and pressure testing within the cargo length area, cargoholds, ballast tanks, including fore and aft peak tanks, required by UR Z10.2.
1.1.2 The arrangements and safety aspects of the survey are to be acceptable to theattending surveyor(s).
1.2Documentation

All documents used in the development of the survey programme are to be available
onboard during the survey as required by section 6.
2

Arrangement of cargo holds, tanks and spaces

This section of the survey programme is to provide information (either in the form of plans ortext) on the arrangement of cargo holds, tanks and spaces that fall within the scope of thesurvey.
3

List of cargo holds, tanks and spaces with information on their use, extent of
coatings and corrosion prevention system

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section of the survey programme is to indicate any changes relating to (and is to update)
Z10.2 This
the information on the use of the holds and tanks of the ship, the extent of coatings and the(cont’d)corrosion prevention system provided in the Survey Planning Questionnaire.
4

Conditions for survey

This section of the survey programme is to provide information on the conditions for survey,
e.g. information regarding cargo hold and tank cleaning, gas freeing, ventilation, lighting, etc.
5

Provisions and method of access to structures

This section of the survey programme is to indicate any changes relating to (and is to update)the information on the provisions and methods of access to structures provided in the Survey
Planning Questionnaire.
6

List of equipment for survey

This section of the survey programme is to identify and list the equipment that will be madeavailable for carrying out the survey and the required thickness measurements.
7

Survey requirements

7.1

Overall survey

This section of the survey programme is to identify and list the spaces that should undergo an
overall survey for this ship in accordance with 2.3.1.
7.2

Close-up survey

This section of the survey programme is to identify and list the hull structures that are toundergo a close-up survey for this ship in accordance with 2.3.2.
8Identification of tanks for tank testingThis section of the survey programme is to identify and list the cargo holds and tanks that are
to undergo tank testing for this ship in accordance with 2.5.
9Identification of areas and sections for thickness measurements

This section of the survey programme is to identify and list the areas and sections where
thickness measurements are to be taken in accordance with 2.2.4.4 and 2.4.1.
10

Minimum thickness of hull structures

This section of the survey programme is to specify the minimum thickness for hull structuresof this ship that are subject to survey, (indicate either (a) or preferably (b), if such information
is available):(a)

Determined from the attached wastage allowance table and the original
thickness to the hull structure plans of the ship;(b)

Given in the following table(s):Page 130 of 139

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Z10.2(cont’d)Area or location

Deck
Plating
Longitudinals
Longitudinal girders
Cross deck plating
Cross deck stiffeners
BottomPlating
Longitudinals
Longitudinal girders
Inner bottom
Plating
Longitudinals
Longitudinal girders
Floors
Ship side in way of topside tanks
Plating
Longitudinals
Ship side in way of hopper side tanks
Plating
Longitudinals
Ship side in way of tanks (if applicable)
Plating
Longitudinals
Longitudinal stringers
Ship side in way of cargo holds
Plating
Side frames webs
Side frames flanges
Upper brackets webs
Upper brackets flanges
Lower brackets webs
Lower brackets flanges
Longitudinal bulkhead (if applicable)
Plating
Longitudinals (if applicable)
Longitudinal girders (if applicable)
Transverse bulkheads
Plating
Stiffeners (if applicable)
Upper stool plating
Upper stool stiffeners
Lower stool plating
Lower stool stiffeners
Transverse web frames in topside tanks
Plating
Flanges
Stiffeners
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Original asbuilt
thickness(mm)

Minimum
thickness(mm)

Substantial
corrosion
thickness(mm)

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web frames in hopper tanks
Z10.2 Transverse
Plating(cont’d)Flanges
Stiffeners
Plating
Stiffeners
Plating
Stiffeners

Hatch Covers
Hatch Coamings

Note: The wastage allowance tables are to be attached to the survey programme.
For vessels built under IACS Common Structural Rules, the renewal thickness of the hull
structure elements is indicated in the appropriate drawings.
11

Thickness Measurement Firm

This section of the survey programme is to identify changes, if any, relating to theinformation on the thickness measurement firm provided in the Survey Planning
Questionnaire.
12

Damage experience related to the ship

This section of the survey programme is to, using the tables provided below, provide detailsof the hull damages for at least the last three years in way of the cargo holds, ballast tanks
and void spaces within the cargo length area. These damages are subject to survey.
Hull damages sorted by location for this ship
Cargo hold,tank or
space
number or
area

Possiblecause, if
known

Descriptionof thedamages

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Location

RepairDate ofrepair

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Z10.2

Hull damages for sister or similar ships (if available) in the case ofdesign related damage(cont’d)Cargo hold,tank or
space
number or
area

13

Possiblecause, if
known

Descriptionof thedamages

Location

RepairDate ofrepairAreas identified with substantial corrosion from previous surveys

This section of the survey programme is to identify and list the areas of substantial corrosion
from previous surveys.
14

Critical structural areas and suspect areas

This section of the survey programme is to identify and list the critical structural areas andthe suspect areas, when such information is available.
15

Other relevant comments and information

This section of the survey programme is to provide any other comments and information
relevant to the survey.

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Z10.2 Appendices(cont’d)Appendix 1 - List of plans
Paragraph 5.1.3 requires that main structural plans of cargo holds and ballast tanks (scantling
drawings), including information regarding use of high tensile steel (HTS) are to be available.
This Appendix of the survey programme is to identify and list the main structural plans which
form part of the survey programme.
Appendix 2 - Survey Planning Questionnaire
The Survey Planning Questionnaire (annex VIB), which has been submitted by the owner, is
to be appended to the survey programme.
Appendix 3 - Other documentation
This part of the survey programme is to identify and list any other documentation that forms
part of the plan.
Prepared by the owner in co-operation with the Classification Society for compliance with
5.1.3:
Date:…………………………………(name and signature of authorized owner’s representative)
Date:…………………………………(name and signature of authorized representative of theClassification Society)

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Z10.2

ANNEX VIB

(cont’d)SURVEY PLANNING QUESTIONNAIRE
1 The following information will enable the owner in co-operation with the Classification
Society to develop a Survey Programme complying with the requirements of UR Z10.2. It isessential that the owner provides, when completing the present questionnaire, up-to-date
information. The present questionnaire, when completed, shall provide all information andmaterial required by UR Z10.2.
Particulars
Ship’s name:
IMO number:
Flag State:
Port of registry:
Owner:Classification Society:
Class ID:
Gross tonnage:
Deadweight (metric tonnes):
Date of build:

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Z10.2 Information on access provision for close-up surveys and thickness measurement(cont’d)

Hold/
Tank
No.

2 The owner is to indicate, in the table below, the means of access to the structures subject
to close-up survey and thickness measurement. A close-up survey is an examination where
the details of structural components are within the close visual inspection range of theattending surveyor, i.e. preferably within reach of hand.
Structure

Permanent
Means ofAccessTemporary Rafts Ladders
staging

F.P.
A.P.
CARGO
HOLDS

Fore Peak
Aft PeakHatch side coamings
Topside sloping plate
Upper stool plating
Cross deck
Side shell, frames &brackets
Transverse bulkhead
Hopper tank plating
Lower stool plating
Tank top
TOPSIDE Underdeck structure
TANKS
Side shell & structure
Sloping plate &structure
Webs & bulkheads
HOPPER Hopper sloping plate
TANKS& structure
Side shell & structure
Bottom structure
Webs & bulkheads
Double bottom
structure
Upper stool internal
structure
Lower stool internal
structure

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DirectaccessOther
means(pleasespecify)

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Z10.2 History of bulk cargoes of a corrosive nature (e.g. high sulphur content)(cont’d)Owner’s inspections
3 Using a format similar to that of the table below (which is given as an example), the owneris to provide details of the results of their inspections, for the last 3 years - in accordance with
the Guidelines - on all CARGO holds and BALLAST tanks and VOID spaces within the cargo
area.
Tank/HoldNo.

Corrosion
protection(1)

Coating
extent(2)

Coating
condition(3)

Structural
deterioration(4)

Hold andtank history(5)

Cargo holds
Topside tanks
Hopper tanks
Doublebottom tanks
Upper stools
Lower stools
Fore peak
Aft peakMiscellaneous
other spaces:
Note: Indicate tanks which are used for oil/ballast

1)

HC=hard coating; SC=soft coating;SH=semi-hard coating; NP=no protection

2)

U=upper part; M=middle part;
L=lower part; C=complete

3)

G=good; F=fair; P=poor;
RC=recoated (during the last 3 years)

4)

N=no findings recorded; Y=findings recorded,
description of findings is to be attached to this questionnaire

5)

DR=Damage & Repair; L=Leakages;
CV= Conversion(Description to be attached to this questionnaire)

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Z10.2 Name of owner’s representative:(cont’d)Signature:
Date:

Reports of Port State Control inspections

List the reports of Port State Control inspections containing hull structural related
deficiencies, relevant information on rectification of the deficiencies:

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Z10.2 Safety Management System(cont’d)

List non-conformities related to hull maintenance, including the associated corrective
actions:

Name and address of the approved thickness measurement firm:

Annex VI end
Document end
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