SECTION 23 3225

BAG-IN BAG-OUT HOUSINGS

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LANL MASTER SPECIFICATION

This template must be edited for each project.  In doing so, specifier
must add job-specific requirements.  Brackets are used in the text to
indicate designer choices or locations where text must be supplied by
the designer.  Once the choice is made or text supplied, remove the
brackets.  The specifications must also be edited to delete
specification requirements for processes, items, or designs that are not
included in the project \-- and specifier's notes such as these.  To
seek a variance from requirements in the specifications that are
applicable, contact the Engineering Standards Manual Mechanical
[POC](http://engstandards.lanl.gov/engrman/6mech/htmls/mechnew2.htm).
Please contact POC with suggestions for improvement as well.\
\
When assembling a specification package, include applicable
specifications from all Divisions, especially Division 1, General
requirements.\
\
Specification developed for ML-4 projects.  For ML-1, 2, and 3
applications, additional requirements and independent reviews should be
added if increased confidence in procurement or execution is desired;
see ESM Chapter 1 Section Z10 Specifications and Quality sections.\
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PART 1 GENERAL

1.1 SECTION INCLUDES

A. Fire Screens

B. Prefilters

C. Chemical Adsorbers

D. Filter Train

1.2 LANL PERFORMED WORK

A. LANL will do in-place testing of installed chemical adsorbers.

1.3 SUBMITTALS

> A. Submit the following in accordance with Section 01 3300, Submittal
> Requirements:

1\. Filters (fire screens, prefilters, chemical adsorbers)[^1].

a\. Catalog data indicating the filter efficiency and pressure drop at
rated capacity.

b\. Installation instructions.

2\. Filter Train

a\. Catalog data.

b\. Certifications that unit meets ASME N509-1989, and ASME N510-1989
requirements.

c\. Installation instructions.

d\. Materials/part lists.

e\. Shop drawings.

f\. Test report of pressure decay leak test for the entire housing and
each sub assembly.

g\. Warranties.

1.4 MAINTENANCE

A. Extra Materials: Furnish temporary prefilters to be used during
construction.

PART 2 PRODUCTS

2.1 Fire Screen

A. Manufacturer: Farr Co., Type 44G

B. Frame size 23 3/8 in. x 23 3/8 in. x 2 in., no gasket, all metal
filter with zinc plated steel screen media, initial pressure drop 0.06
in. w.c. at 1000 cfm. Filter not to be oiled.

2.2 Prefilter

A. Manufacturer: Farr Co., RIGA-FLO 15

B. Frame size 23 3/8 in. x 23 3/8 in. x 5 7/8 in., no gasket, UL Class
1, 65% efficiency per ASHRAE Standard 52-76, initial pressure drop 0.20
in. w.c. at 1000 cfm.

2.3 HEPA Filter (LANL FURNISHED AND INSTALLED)

A. Frame nominal size 24 in. x 24 in. x 12 in., nuclear grade, gasket
seal, UL Class 1, 99.97% efficient, initial pressure drop 1.0 in. w.c.
at \[1000 cfm, LANL Stock No. GS2724\] or \[1250 cfm, LANL Stock No.
GS2741\]^(1)^, fire-retardant wood frame or stainless steel frame
material, and guaranteed to operate up to 10 in. w.c. without failure.

2.4 CHEMICAL ADSORBER

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The following is a sample specification of a chemical adsorber. Consult
with IHP-05 and the user for specific criteria.

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A. Manufacturer

1\. Charcoal Service Corporation, Part No. CSC-18-62-AS

2\. Flanders Filters Inc., Part No. 2V-C63-G18

B. Type I (V-Bed) adsorber with 2 in. thick bed of 8 x 16 mesh activated
carbon made from coconut shell. Residence time 0.125 seconds at a flow
of 1250 cfm. Construct adsorber frame of 14 gage. 304 stainless steel
with 26 gage 304 stainless steel perforated screens. Provide adsorber
frame with 1/4 in. thick x 3/4 in. wide closed cell neoprene gasket on
the upstream flange. Adsorber shall meet the requirements of ASME
N509-1989 and shall be factory tested in accordance with IES‑RP‑CC‑008
(latest edition) to verify a minimum mechanical efficiency of 99.9%.
Adsorber nominal dimensions are 24 in. x 24 in. x 18 in..

2.5 FILTER TRAIN

A. Manufacturers

1\. Flanders, E6 housing, gasket seal.

2\. Charcoal Services Corp.

3\. AAF/Snyder General, 6119 Series.

B. Filter Train Assembly

> Arrangement: Provide a \[ \] high x \[ \] wide filter train assembly
> with side access doors on \[the left or right or both sides\]^(1)(2)^
> looking in direction of air flow, transitions on both ends, and with
> housings assembled in direction of air flow as follows; \[2 in. fire
> screen, 6 in. prefilter, test section, 12 in. HEPA filter, test
> section, 18 in. chemical adsorber, test section, 18 in. chemical
> adsorber, test section, 12 in. HEPA filter, and test section.\]^(1)^
> The filter train assembly shall be built up of factory leak tested
> subsection housings that are no larger than 1 high x 3 wide. Join
> housings together vertically, in parallel and/or in series to make up
> a filter train. Weld joints airtight and conform to standard welding
> procedures.

C. Containment Housing \[(for HEPA filters, prefilters, adsorbers and
fire screens)\]^(1)^

1\. Construction: Construct housing from \[Type 304 and 304L\]^(4)^
stainless steel with a 2B mill finish. Provide housing with 100%
seam-welds in accordance with ASME N509-89, paragraph 7.3 on joints
across the pressure boundaries and reinforce to withstand up to \[10
in.\]^(8)^ w.g. \[positive\]^(1)(3)^ or \[negative\]^(1)(3)^ pressure.
Wire brush and clean welds to remove discoloration and weld splatter.
Joints and seams which are part of the filter sealing surface, flange
connections and bag-out rings shall be ground smooth and free of burrs
and sharp edges. Factory weld housings, transitions, base, lifting lugs,
and weather cap to form one unit. \[Weld a sampling port, 3/4 in.
Schedule 40 pipe, to the top of the HEPA housing, upstream of the
filter.\]^(5)^ Provide type 300 series stainless steel miscellaneous
mechanical components. Manufacture housings in accordance with ASME
N509-89-Nuclear Power Plant Air-Cleaning Units and Components.

2\. Access Doors: Provide removable, separate, access doors for each
tier of filters \[(HEPA filters, prefilters, adsorbers, and fire
screen)\]^(1)^. Use solid silicone or neoprene gaskets that seal the
door to the housing wall while maintaining clearance between the bag-out
flange and the inside door surface. Door gasket shall be a molded gasket
fitted to the door. Use door gasket material of extra firm (21-29 PSI by
compression/deflection) density closed cell silicone sponge conforming
to MIL-R-46089 with skin surface finish or ASTM D1056 grade SCE-45 or
30-40 Shore-A-durometer neoprene. Provide stainless steel door latches
that pivot away after release and remain attached to the housing or
door. Use 300 series s.s. bolts with nuts made from a precipitation
hardening (PPH) grade of stainless steel, treated substantially harder
than the bolt. Metal pockets for instruction manuals are optional.

3\. Smooth Inlet Design: On the upstream side of each prefilter and
filter position, provide a smooth inlet design with a minimum 3/4 in.
deep recess around the upstream perimeter of the prefilter or filter to
limit the buildup of contaminants in crevices or filter frames.

4\. Filter Locking Mechanism: Provide a filter locking mechanism with a
replaceable locking tray in the HEPA housing \[and chemical adsorber
housing\]^(1)^ having a total clamping load of about 1400 lbs. per 24
in. by 24 in. HEPA filter (per ERDA 76-21 4.3.4).

5\. Filter Rails: Provide filter rails in the \[fire screen and\]^(1)^
prefilter housings, \[2 1/8 in. wide for the fire screen\]^(1)^ and 6
in. wide for the prefilter.

6\. Filter Removal Rod: Provide housings with two or more filters per
access door with a replaceable removal rod to draw the filters to the
change out position.

7\. Bag In/Out: Provide each filter access door with a bag-out port
inside the access door which is hemmed on its outer edges to prevent
tearing of the bag. Provide two continuous ribs on the outside of the
port to hold the bag's elastic shock cord and the safety strap during
the bag-out operation. The turned edge on the port is not considered a
rib. Provide each housing with two, 8 mil, transparent PVC glove bags
for each bag-out port. Incorporate mittens into the bag. Provide bag
with stock number rolled into the hem for easy identification when
reordering. Provide bag with a smooth finish to prevent from sticking to
itself and provide a nylon safety strap with each bag-out port to
prevent the bag from slipping off during the bag-out procedure. Provide
a cinching strap with each bag-out port to tie off the slack in the bag
while the exhaust system is operating. Provide a banding kit to
facilitate in the secure clamping off of the bag between the housing and
the spent filter.

8\. Filter Removal Tray: Provide one filter removal tray for each size
of HEPA filter \[and chemical adsorber\]^(1)^ to aid in the change-out
operation.

D. Test Sections:

1\. Construct test section in such a manner that adjoining test chambers
are isolated from each other to permit individual testing of each HEPA
filter \[and chemical adsorber\]^(1)^ and its pressure boundary for its
efficiency per ASME-N510-1989.

2\. Provide test section with separate aerosol mixing devices, sample
ports, and inlet ports to allow individual in-place testing of the HEPA
filters \[and chemical adsorbers\]^(1)^ per ASME N510-89. Upstream
sampling sections, and downstream sampling sections that require the use
of external power, e.g., compressed air, are not acceptable. The
pressure drop through each test section during testing and normal
operation is not to exceed 0.25 in. w.g. at 1000 cfm per filter. Provide
2 in. Schedule 40 injection ports and 1/2 in. Schedule 40 sampling
ports. Identify each test section with a model number and label all test
equipment such as operational handles, injection and sample ports.
Provide a DOP injection manifold and a sampling manifold on a multiple
high or wide filter train. Manifold all test sections per stage together
in order that each stage of HEPA filter \[and chemical adsorber\]^(1)^
can be treated as a single unit. Provide a stainless steel manifold that
has valves located to isolate individual HEPA filters and \[chemical
adsorbers\]^(1)^ in the event the system fails the in-place LANL testing
criteria at the job site. Provide one external connection for each
manifold and locate 30 in. - 60 in. above the filter train base. Ship
the manifold loose for installation by others. Provide a union at each
break point. Position each manifold to allow for the change out of all
filters without causing interference.

a\. DOP Injection Manifold: Construct the manifold of 1 in. Schedule 40
pipe or 3/4 in. OD tubing and provide a full port ball valve, 1 in. male
NPT end, at the inlet port of the manifold.

b\. Sampling Manifold: Construct the manifold of 1/2 in. Schedule 40
pipe or 5/8 in. OD tubing and provide a full port ball valve, 1/2 in.
male NPT end, at the outlet port of the manifold. Install ball valves on
each manifold branch line to allow each HEPA filter \[and chemical
adsorber\]^(1)^ to be individually tested.

E. Pressure Decay Leak Test:

1\. Factory leak test each subsection housing and the completed filter
train assembly by the pressure decay method to \[plus 10 in. w.g.\]^(8)^
\[minus 10 in. w.g.\]^(8)^ in accordance with ASME N510-89-Testing of
Nuclear Air Cleaning Systems. Leak test to acceptance criteria of a
maximum of 0.2 percent of housing volume per hour at \[design
pressure\]^(8)^. Rectify and retest any deficiency and work effected by
such deficiency. Submit certifications of leak test.

F. Miscellaneous

1\. Static-Pressure Ports: Locate static-pressure ports on the front or
top of the housing upstream and downstream of each filter bank. Provide
1/4 in. NPT ports with cap, type 304 stainless steel.

2\. Base: Provide a 6 in. high stainless steel channel base on four
sides welded to the unit and with predrilled mounting holes.

3\. Quality Assurance: Comply with ANSI/ASME NQA-1.

4\. Lifting Lugs: Provide type 304 stainless steel lifting lugs with a 2
in. diameter lifting eye.

5\. Custom-Engraved Plates: Include plates with the housing model
number, and the original order number with minimum 1/8 in. letter
height. Fabricate custom-engraved plates from polished stainless steel
and permanently weld to the housing.

6\. Seismic Qualification: \[Consult with ESH personnel and the design
team structural engineer for the specific project requirements that will
govern the seismic criteria to be used.\]

7\. Weather/Housekeeping Cap: Provide a continuously welded weather cap
to the top of each housing and sloped to prevent accumulation of
liquids.

8\. Transition to Ductwork: Provide \[24 or 36 in. long\]^(1)(6)^ inlet
and outlet transitions welded or bolted to the housing with a 2 in. x 2
in. x 3/16 in. minimum x \[ \] I.D.^(7)^ angle ring flange with
predrilled mounting holes and shipped with gaskets. If the transition is
bolted, the spacing shall be the manufacturer's standard bolt-hole
pattern, not to exceed 4 in. between bolt holes on center. Transition to
be capable of withstanding up to \[10 in. w.g. negative or
positive\]^(1)^ pressure. Provide gasket materials of closed cell
neoprene, 1/4 in. thick, ASTM D1056 Specification for Flexible Cellular
Materials - Sponge or Expanded Rubber, Grade SCE-45 or 30-40 Shore-A
durometer.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Field Conditions: Examine areas and conditions under which air
filters and filter housings will be installed. Do not proceed with work
until unsatisfactory conditions have been corrected in manner acceptable
to Installer.

3.2 INSTALLATION

A. Filter Train: Install per manufacturer's instructions. Secure filter
train to concrete pad with concrete anchors. Drill to match holes in
base.

B. Filters: Install in accordance with manufacturer's instructions and
recognized industry practices. LANL will furnish, test, and install HEPA
filters.

C. Fan Operation: Do not operate fan system until filters are in place.
Replace temporary filters used during construction.

END OF SECTION

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Do not delete the following reference information:

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FOR LANL USE ONLY

This project specification is based on LANL Master Specification 23
3225, Rev. 1, dated June 11, 2008.

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Superscript Notes

^(1)^ Edit to suit job requirements.

^(2)^ Specify doors on both sides when there are more than 3 filters
wide in a bank.

^(3)^ Consult with the manufacturer if a higher pressure system (greater
than ± 10 in. w.g.) is required (additional bracing may be necessary).

^(4)^ Specify 316/316L material for high corrosive air stream.

^(5)^ Provide an upstream sampling port with the filter housing only
when the train assembly consists of a 1 high x 1 wide HEPA filter and a
test inlet section is not provided.

^(6)^ Specify 36 in. long transitions for 3 high x 3 wide assemblies and
24 in. long transition for assemblies less than 3 high x 3 wide.

^(7)^ Edit to suit when upstream or downstream duct sizes are different
or if rectangular duct is used.

^(8)^ Edit operation pressure to suit. The plenum must be tested at the
maximum pressure it could possibly see during service. A housing that is
normally under a negative pressure but could see a positive pressure
during an upset condition, e.g., fan failure, must be tested for both a
positive and a negative pressure of the expected magnitude. As a
minimum, use a test pressure of ±10 in. w.g.

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[^1]: