23 00 00.pdf

DD#2 Complex Amendment 2021-04-06 Portsmouth Naval Shipyard, Kittery, ME

SECTION 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS

08/10

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

AHRI 410 (2001; Addendum 1 2002; Addendum 2 2005;

Addendum 3 2011) Forced-Circulation Air-Cooling and Air-Heating Coils

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 62.1 (2010; Errata 2011; INT 3 2012; INT 4 2012; INT 5 2013) Ventilation for Acceptable Indoor Air Quality

ASHRAE 70 (2006; R 2011) Method of Testing for Rating the Performance of Air Outlets and Inlets

ASME INTERNATIONAL (ASME)

ASME AG 1 (2019) Code on Nuclear Air and Gas Treatment

ASTM INTERNATIONAL (ASTM)

ASTM A123/A123M (2013) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A924/A924M (2014) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM B117 (2011) Standard Practice for Operating Salt Spray (Fog) Apparatus

ASTM B766 (1986; R 2008) Standard Specification for Electrodeposited Coatings of Cadmium

ASTM D1654 (2008) Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

ASTM D3359 (2009; E 2010; R 2010) Measuring Adhesion by Tape Test

SECTION 23 00 00 Page 1

ASTM D520 (2000; R 2011) Zinc Dust Pigment

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 (2011; Errata 2012) Motors and Generators

NEMA MG 10 (2001; R 2007) Energy Management Guide for Selection and Use of Fixed Frequency Medium AC Squirrel-Cage Polyphase Induction Motors

NEMA MG 11 (1977; R 2012) Energy Management Guide for Selection and Use of Single Phase Motors

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1966 (2005) HVAC Duct Construction Standards Metal and Flexible, 3rd Edition

UNDERWRITERS LABORATORIES (UL)

UL 586 (2009) Standard for High-Efficiency Particulate, Air Filter Units

UL 6 (2007; reprint Nov 2014) Electrical Rigid Metal Conduit-Steel

UL 900 (2004; Reprint Feb 2012) Standard for Air Filter Units

UL Bld Mat Dir (2012) Building Materials Directory

DEPARTMENT OF ENERGY

HDBK 1169-2003 Nuclear Air Cleaning Handbook

1.2 SYSTEM DESCRIPTION

Furnish ductwork, piping offsets, fittings, and accessories as required to provide a complete installation. Coordinate the work of the different trades to avoid interference between piping, equipment, structural, and electrical work. Provide complete, in place, all necessary offsets in piping and ductwork, and all fittings, and other components, required to install the work as indicated and specified.

1.2.1 Mechanical Equipment Identification

Each space containing mechanical equipment will have diagrams of sufficient number to completely describe the equipment. The diagrams will include reference to other diagrams to which the enclosure's equipment is connected. Where more than one chart or diagram per space is required, mount these in edge pivoted, swinging leaf, extruded aluminum frame holders which open to 170 degrees.

1.2.1.1 Charts

Provide chart listing of equipment by designation numbers and capacities

SECTION 23 00 00 Page 2 such as flow rates, pressure and temperature differences, heating and cooling capacities, horsepower, pipe sizes, and voltage and current characteristics.

1.2.1.2 Diagrams

Submit proposed diagrams, at least 2 weeks prior to start of related testing. Provide neat mechanical drawings provided with laminated plastic, system diagrams that show the layout of equipment, piping, and ductwork, and typed condensed operation manuals explaining preventative maintenance procedures, methods of checking the system for normal, safe operation, and procedures for safely starting and stopping the system.

Coordinate exact location of diagrams with PNSY, outside of Radiologically Controlled Areas.

The following diagram submittals shall be provided for each separate enclosure:

Tower 5 Diagrams and charts Tower 6 Diagrams and charts Enclosure 6 Diagrams and charts Enclosure 8 Diagrams and charts Enclosure 5 and Enclosure 7 Diagrams and charts Enclosure 4 Diagrams and charts Ground Level Diagrams and charts

1.2.2 Service Labeling

Label all scheduled equipment, such as fans, air handlers, and terminal units. with labels constructed of engraved metal, or Metal Photo (anodized photosensitive aluminum) with no sharp edges or burrs. Labels shall be in accordance with the typical examples below and paragraph 2.2. Follow paragraph 2.2 for specifics of material, size, and letter height. Engraved aluminum or anodized photosensitive aluminum are both acceptable.

SERVICE LABEL AND TAG DESIGNATION

Filter Housing FH -

Fan F -

Heat Pump HP - _____

Ceiling Fan CF - _____

Electric Unit Heater EUH - _____

Rooftop Unit RTU -

Identify similar services with different temperatures or pressures. Where pressures could exceed 125 pounds per square inch, gage, include the maximum system pressure in the label. Label and arrow piping in accordance with the following:

a. Each point of entry and exit of pipe passing through walls.

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b. Each change in direction, such as elbows and tees.

c. In congested or hidden areas and at all access panels at each point required to clarify service or indicated hazard.

d. In long straight runs, locate labels at distances within eyesight of each other not to exceed 75 feet. All labels shall be visible and legible from the primary service and operating area.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only.

Approval by the Architect or Engineer of Record is required for submittals with an "AE" designation. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00

SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Tower 5 Detail Drawings Mechanical; G, AE Tower 6 Detail Drawings Mechanical; G, AE Tower Ground Level System Detail Drawings Mechanical; G, AE Enclosure 6 Detail Drawings Mechanical; G, AE Enclosure 8 Detail Drawings Mechanical; G, AE Enclosure 5 and Enclosure 7 Detail Drawings Mechanical; G, AE Enclosure 4 Detail Drawings Mechanical; G, AE Tower 5 Diagrams and charts ; G, AE Tower 6 Diagrams and charts ; G, AE Enclosure 6 Diagrams and charts ; G, AE Enclosure 8 Diagrams and charts ; G, AE Enclosure 5 and Enclosure 7 Diagrams and charts ; G, AE Enclosure 4 Diagrams and charts ; G, AE Ground Level Diagrams and charts ; G, AE

SD-03 Product Data

Tower Airflow Measuring Station; G, AE Enclosure 8 Airflow Measuring Station; G, AE Enclosure 5 and Enclosure 7 Airflow Measuring Station; G, AE Tower 5 Dampers And Actuators; G, AE Tower 6 Dampers And Actuators; G, AE Enclosure 6 Dampers And Actuators; G, AE Enclosure 8 Dampers and Actuators; G, AE Enclosure 5 and Enclosure 7 Dampers and Actuators; G, AE Diffusers; G, AE Registers and Grilles; G, AE Enclosure 4 Energy Recovery Ventilator; G, AE Flexible Duct Connectors; G, AE Identification Plates; G, AE Combination Pressure Gage/Sensor/Transmitters; G, AE Split System Air Conditioner; G, AE Adhesive-backed tape for SMACNA duct; G, AE Tubings and Fittings; G, AE

SD-06 Test Reports

SECTION 23 00 00 Page 4

Test Procedures; G, AE Performance Tests; G, AE

SD-08 Manufacturer's Instructions

Manufacturer's Installation Instructions; G Operation and Maintenance Training; G

SD-10 Operation and Maintenance Data

Enclosure 8 Operation and Maintenance Manuals; G Enclosure 5 and Enclosure 7 Operation and Maintenance Manuals; G Enclosure 4 Operation and Maintenance Manuals; G Enclosure 6 Operation and Maintenance Manuals; G Tower 5 Operation and Maintenance Manuals; G Tower 6 Operation and Maintenance Manuals; G Tower Ground Level Operation And Maintenance Manuals; G

1.4 QUALITY ASSURANCE

Except as otherwise specified, approval of materials and equipment is based on manufacturer's published data.

a. Where materials and equipment are specified to conform to the standards of the Underwriters Laboratories, the label of or listing with reexamination in UL Bld Mat Dir , and UL 6 is acceptable as sufficient evidence that the items conform to Underwriters Laboratories requirements. In lieu of such label or listing, submit a written certificate from any nationally recognized testing agency, adequately equipped and competent to perform such services, stating that the items have been tested and that the units conform to the specified requirements. Outline methods of testing used by the specified agencies.

b. Where materials or equipment are specified to be constructed or tested, or both, in accordance with the standards of the ASTM International (ASTM), the ASME International (ASME), or other standards, a manufacturer's certificate of compliance of each item is acceptable as proof of compliance.

c. Conformance to such agency requirements does not relieve the item from compliance with other requirements of these specifications.

1.4.1 Prevention of Corrosion

Protect metallic materials against corrosion. Manufacturer shall provide rust-inhibiting treatment and standard finish for the equipment enclosures. Do not use aluminum in contact with earth, and where connected to dissimilar metal. Protect aluminum by approved fittings, barrier material, or treatment. Ferrous parts such as anchors, bolts, braces, boxes, bodies, clamps, fittings, guards, nuts, pins, rods, shims, thimbles, washers, and miscellaneous parts not of corrosion-resistant steel or nonferrous materials shall be hot-dip galvanized in accordance with ASTM A123/A123M for exterior locations and cadmium-plated in conformance with ASTM B766 for interior locations.

Ductwork insulation shall be wrapped and sealed with a durable, weather proof material to prevent infiltration of moisture.

SECTION 23 00 00 Page 5

1.4.2 Asbestos Prohibition

Do not use asbestos and asbestos-containing products.

1.4.3 Detail Drawings

Submit detail drawings showing equipment layout, including assembly and installation details and electrical connection diagrams; tubing, fittings, ductwork layout showing the location of all supports and hangers, typical hanger details, gauge reinforcement, reinforcement spacing rigidity classification, and static pressure and seal classifications. Include any information required to demonstrate that the system has been coordinated and functions properly as a unit on the drawings and show equipment relationship to other parts of the work, including clearances required for operation and maintenance. Submit drawings showing bolt-setting information, and foundation bolts prior to concrete foundation construction for all equipment indicated or required to have concrete foundations. Submit function designation of the equipment and any other requirements specified throughout this Section with the shop drawings.

The following detailed drawings submittals shall be provided for each enclosure:

Tower 5 Detail Drawings Mechanical Tower 6 Detail Drawings Mechanical Tower Ground Level System Detail Drawings Mechanical Enclosure 8 Detail Drawings Mechanical Enclosure 5 and Enclosure 7 Detail Drawings Mechanical Enclosure 6 Detail Drawings Mechanical Enclosure 4 Detail Drawings Mechanical

The detail drawings shall include captivation measures for any equipment and associated fasteners installed within the captivation boundaries and these proposed captivation measures shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures, materials, and fasteners proposed shall be clearly indicated in the shop drawings for the associated enclosure and area.

1.4.4 Test Procedures

Submit proposed test procedures and test schedules for the ductwork leak test, and performance tests of systems, at least 2 weeks prior to the start of related testing incorporate the testing schedule into the 3-week lookahead . Refer to Specification 23 23 00 REFRIGERANT PIPING for testing of refigerant lines.

1.5 DELIVERY, STORAGE, AND HANDLING

Protect stored equipment at the jobsite from the weather, humidity and temperature variations, dirt and dust, or other contaminants.

Additionally, cap or plug all pipes until installed.

PART 2 PRODUCTS

2.1 STANDARD PRODUCTS

Except for the fabricated duct, plenums and casings specified in paragraphs "Metal Ductwork" and "Plenums and Casings for Field-Fabricated

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Units", provide components and equipment that are standard products of manufacturers regularly engaged in the manufacturing of products that are of a similar material, design and workmanship. This requirement applies to all equipment, including diffusers, registers, and balancing dampers.

a. Standard products are defined as components and equipment that have been in satisfactory commercial or industrial use in similar applications of similar size for at least two years before bid opening.

b. Prior to this two year period, these standard products shall have been sold on the commercial market using advertisements in manufacturers' catalogs or brochures. These manufacturers' catalogs, or brochures shall have been copyrighted documents or have been identified with a manufacturer's document number.

c. Provide equipment items that are supported by a service organization.

Where applicable, provide equipment that is an ENERGY STAR Qualified product or a Federal Energy Management Program (FEMP) designated product.

2.2 IDENTIFICATION PLATES

In addition to standard manufacturer's identification plates, provide identification plates for each piece of mechanical equipment. Engraved aluminum and anodized photosensitive aluminum are both acceptable.

Paragraph 1.2.2 indicates examples of tag designation. Identification plates are to designate the function of the equipment. Submit designation with the shop drawings to be approved by PNS. Letters shall be upper case. Identification plates 1-1/2-inches high and smaller shall be 1/16-inch thick, with engraved lettering 1/8-inch high; identification plates larger than 1-1/2-inches high shall be 1/8-inch thick, with engraved lettering of suitable height. Identification plates 1-1/2-inches high and larger shall have beveled edges. Install identification plates using mechancial fasteners in a manner that does not jeopardize the equipment housing for which it serves.

The product data for the identification plates shall include proposed captivation measures and these shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures, materials, and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

2.3 EQUIPMENT GUARDS AND ACCESS

Fully enclose or guard belts, pulleys, chains, gears, couplings, projecting setscrews, keys, and other rotating parts exposed to personnel contact according to OSHA requirements. Properly guard or cover with insulation of a type specified, high temperature equipment and piping exposed to contact by personnel or where it creates a potential fire hazard. The requirements for catwalks, operating platforms, ladders, and guardrails are specified in Section 05 50 13 MISCELLANEOUS METAL

FABRICATIONS.

2.4 ELECTRICAL WORK

a. Provide motors, controllers, integral disconnects, contactors, and controls with their respective pieces of equipment, except controllers indicated as part of motor control centers. Provide electrical

SECTION 23 00 00 Page 7 equipment, including motors and wiring, as specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Provide manual or automatic control and protective or signal devices required for the operation specified and control wiring required for controls and devices specified, but not shown. For packaged equipment, include manufacturer provided controllers with the required monitors and timed restart.

b. For single-phase motors, provide high-efficiency type, fractional-horsepower alternating-current motors, including motors that are part of a system, in accordance with NEMA MG 11. Integral size motors shall be the premium efficiency type in accordance with

NEMA MG 1.

c. For polyphase motors, provide squirrel-cage medium induction motors, including motors that are part of a system, and that meet the efficiency ratings for premium efficiency motors in accordance with NEMA MG 1. Select premium efficiency polyphase motors in accordance with NEMA MG 10.

d. Provide motors in accordance with NEMA MG 1 and of sufficient size to drive the load at the specified capacity without exceeding the nameplate rating of the motor. Provide motors rated for continuous duty with the enclosure specified. Provide motor duty that allows for maximum frequency start-stop operation and minimum encountered interval between start and stop. Provide motor torque capable of accelerating the connected load within 20 seconds with 80 percent of the rated voltage maintained at motor terminals during one starting period. Provide motor starters complete with thermal overload protection and other necessary appurtenances. Fit motor bearings with grease supply fittings and grease relief to outside of the enclosure.

All motors shall be direct-drive.

e. Where two-speed or variable-speed motors are indicated, solid-state variable-speed controllers are allowed to accomplish the same function. Use solid-state variable-speed controllers for motors rated 10 hp or less and adjustable frequency drives for larger motors.

2.5 ANCHOR BOLTS

Provide anchor bolts for equipment placed on concrete equipment pads or on concrete slabs. Bolts to be of the size and number recommended by the equipment manufacturer and located by means of suitable templates.

Installation of anchor bolts shall not degrade the surrounding concrete.

Provide anchor bolts recommended by the equipment manufacturer for equipment placed on structural steel supports.

2.6 INDOOR AIR QUALITY

Provide equipment and components that comply with the requirements of ASHRAE 62.1 unless more stringent requirements are specified herein.

2.7 DUCT SYSTEMS

2.7.1 Metal Ductwork

Provide metal ductwork construction, including all fittings and components, that complies with SMACNA 1966, ASME AG 1 , and HDBK 1169-2003 as supplemented and modified by this specification.

SECTION 23 00 00 Page 8

a. Unless otherwise specified, duct and housings upstream and downstream of the Recirculation fan shall be designed, fabricated, installed and tested in accordance with the Nuclear Air Cleaning Handbook (DOEHDBK-1169-2003), with the exception of the Enclosure 4 and Tower 5 and 6 Ground Level, and Interior Supply Ductwork for all Enclosures, which shall be constructed in accordance with SMACNA Industrial Duct Standards. Ductwork upstream of HEPA filters (including factory supplied welded transition pieces) shall be constructed to Level 4 standards, and tested to Level 4 leakage criteria. Ductwork downstream of the welded HEPA filter transition piece shall be constructed to Level 4 standards in accordance with the Nuclear Air Cleaning Handbook DOEHDBK-1169-2003, and tested to the less stringent Level 2 leakage criteria. Ductwork shall be constructed meeting the requirements for the duct system static pressure specified in APPENDIX D of Section 23 05 93 TESTING, ADJUSTING AND BALANCING FOR HVAC.

b. Provide ductwork that meets the requirements of SMACNA Seal Class A, for Enclosure 4 and Tower 5 and 6 Ground Level, and Interior Supply Ductwork for all Enclosures. Sealing requirements include all transverse joints, longitudinal seams, and duct wall penetrations. The resulting leakage seal class is 64 for rectangular metal ducts, and 32 for round and oval metal ducts. Flanges and gaskets are required at transverse joints.

2.7.1.1 Ductwork Sheet-Metal Thickness and Reinforcement:

a. Duct, housings and equipment upstream of the Recirculation Fan shall be designed to withstand negative fan pressure as indicated on the design drawings. Choose gage thickness of interior return ductwork to minimize the need for reinforcements. Reinforcements on Interior return ductwork shall be fully welded to the ductwork (on each side of the reinforcement flange) to eliminate crevices between the reinforcement and duct.

1. Rectangular Ductwork under Negative Pressure

A. For rectangular ductwork under negative pressure, sheet metal thickness shall be as specified in Table 5.3 of DOE HDBK 1169-2003 and no less than 16 gauge.

The typographical errors in Table 5.3 shall be taken into account. Take into account the error at the top (header) of Table

5.3. "14 in." should be "24 in."

B. For rectangular duct under negative pressure, reinforcement shall be as specified in Table 5.4 of DOE-HDBK 1169-2003 and no less than 16 gauge.

The typographical errors in Table 5.4 shall be taken into account.

On Table 5.4, the "12 in. by" column heading covers 12 inches to 60 inches, and the "24 in. by" column heading covers 24 inches to 60 inches. The note "E = 1 x 1 x 1 3/16" should read "E = 1 x 1 x 3/16".

A flange may be counted as a reinforcement if it meets the strength requirements of a reinforcement as defined in DOE HDBK 1169 2003.

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C. Duct flanges to connect sections of duct must be 1/4 inch thick minimum.

2. Round Ductwork under Negative Pressure

A. For round ductwork under negative pressure, sheet-metal thickness shall be as specified in Table 5.1 of DOE HDBK 1169-2003, and no less than 16 gauge.

B. For round ductwork under negative pressure, reinforcement shall be as specified in Table 5.2 of DOE-HDBK 1169-2003 and no less than 16 gauge. A flange may be counted as a reinforcement if it meets the strength requirements of a reinforcement as defined in

DOE HDBK 1169 2003.

3. Grille Plenums: Build to the ratings in Tables 5.3 and 5.4 of the DOE HNBK 1169-2003, to meet the negative fan pressure as indicated on the drawings, and at least 16 gauge for good welding results.

The return grille shall also meet this rating, to not collapse or be damaged during the DALT process.

b. For round ductwork under positive pressure, sheet-metal thickness shall be no less than 16 gauge. For rectangular ductwork under positive pressure, sheet-metal thickness shall be no less than 16 gauge.

c. Duct, housings and equipment downstream of the Recirculation Fan shall be designed to withstand positive fan pressure as indicated on the design drawings.

1. Follow SMACNA Round Industrial Duct Construction Standards, and SMACNA Rectangular Industrial Duct Construction Standards.

A. For guidance on loads, refer to Chapters 4 and 5 in both the Round and Rectangular Industrial Duct Construction Standards.

B. For round stainless industrial duct tables, see SMACNA Round Industrial Duct Construction Standards, Chapter 9.

C. For rectangular stainless industrial duct tables, see SMACNA Rectangular Industrial Duct Construction Standards, Chapter 7.

D. See Structural drawings for wind and snow loading. Ice loading shall be per ASCE 7-10

d. Exhaust duct and components shall be designed to withstand positive fan pressure as indicated on the design drawings.

2.7.1.2 Ductwork Details

a. Sealants are not allowed. RTV caulking, adhesives, sealant, or other similar products are not permitted to be used to smooth or seal any duct surface or joint. A minimal amount of adhesive is permitted to adhere flanged gaskets to a flanged face to facilitate joint makeup;

however application is limited to mating surface between the flange and gasket such that it does not aid in sealing the joint. Adhesive backed tape may be used on external duct surfaces to seal longitudinal seams on SMACNA ductwork.

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The special case is a Level 4 flange that cannot be fully welded on the external surface. Approval is required to allow these flanges.

After successful DALT results, the external weld on each Level 4 component flange shall be sealed with 3M Marine Grade Silicone Sealant. The sealant shall cover the entire exterior seam, not just the gaps between stitch welds. This is intended to prevent water from pooling or collecting between the exterior stitch welds. This includes dampers, filter housings, and air flow measuring stations.

Request written approval before applying sealant.

b. Material for ductwork and ductwork supports shall be capable of meeting all requirements of Article SA-4000 of ASME AG-1-2019.

Materials shall be in conformance with the ASTM materials listed in Table AA-3100 of ASME AG-1-2019. Materials selected shall be evaluated for suitability with service conditions and compatibility with other materials used in duct construction.

c. Duct shall be fabricated from unpainted Type 304 stainless steel sheet / plate / shapes meeting ASTM A240 or ASTM A276, as applicable.

d. A grade designation is usually required to determine the minimum strength of the material. If the specific grade material has an assigned minimum yield and tensile strength, these values shall be used for design purposes. If values have not been established and assigned, then tests in accordance with the procedures outlined in Article AA-3000 of ASME AG-1-2019 shall be performed to ensure that the strength of the material meets the required design stress values.

e. Ductwork and ductwork supports shall be designed in accordance with the requirements of Article AA-4000 and SA-4000 of ASME AG-1-2019.

f. Measures shall be established for controlling and identifying material substitutions throughout the manufacturing and installation process.

Substitute materials shall be equivalent, or exceed the requirements of Table AA-3100 of ASME AG-1-2019, as determined by the Government.

g. Where space permits, round duct is preferred over rectangular duct because round duct is stronger (particularly under negative or collapsing pressure); is more economical for the high-pressure construction often required for nuclear applications; provides more uniform airflow; and is easier to join and seal than a rectangular duct.

h. Provide radius type elbows with a centerline radius of 1.5 times the width or diameter of the duct where space permits. Otherwise, elbows having a minimum radius equal to the width or diameter of the duct are allowed.

i. Duct branches shall turn through no more than 45º.

j. Duct transitions shall be symmetrical about the axis of air flow , except for the filter housings .

k. If symmetrical duct transitions are not possible due to interference with other equipment, smooth duct wall contours, or other design features shall be used to maintain even air distribution within the duct.

l. The pressure boundary portion of duct transitions shall be designed

SECTION 23 00 00 Page 11 with internal angles less than or equal to 45º when measured from a plane parallel to the direction of air flow.

m. Duct shall be fabricated from unpainted Type 304 stainless steel sheet / plate / shapes meeting ASTM A240 or ASTM A276, as applicable.

n. Duct shall be continuously welded on all pressure boundary joints and seams in accordance with American Welding Society (AWS) procedure D9.1-1990, “Sheet Metal Welding Code”.

o. All welders shall be qualified to AWS D9.1 and all welds shall meet the workmanship standards of AWS D9.1.

p. Joints and seams requiring only intermittent welds, such as reinforcement members or splitter vanes, shall be intermittently welded.

q. All weld joints and seams that are a portion of any gasket seating surface shall be ground smooth and flush with adjacent base metals.

r. All burrs and weld spatter shall be removed.

s. A grade designation is usually required to determine the minimum strength of the material. If the specific grade material has an assigned minimum yield and tensile strength, these values shall be used for design purposes. If values have not been established and assigned, then tests in accordance with the procedures outlined in Article AA-3000 of ASME AG-1-2019 shall be performed to ensure that the strength of the material meets the required design stress values.

t. Ductwork and ductwork supports shall be designed in accordance with the requirements of Article AA-4000 and SA-4000 of ASME AG-1-2019.

u. Measures shall be established for controlling and identifying material substitutions throughout the manufacturing and installation process.

Substitute materials shall be equivalent, or exceed the requirements of Table AA-3100 of ASME AG-1-2019, as determined by the government.

w. Ducting section interface joints may be straight welded joints which are assembled onsite, forming a continuous ducting section or fabricated as sections with welded flanges to be assembled on site.

All welded joints shall be included in the DALT and therefore welding for each test section must be complete prior to performing DALT.

Sealing of test boundaries for each section is only permitted at flanged joints.

x. Ducting section interface joints may be straight welded joints which are assembled onsite, forming a continuous ducting section or fabricated as sections with welded flanges to be assembled on site.

All welded joints shall be included in the DALT and therefore welding for each test section must be complete prior to performing DALT.

Sealing of test boundaries for each section is only permitted at flanged joints.

y. xProvide duct test ports that can be accessed without disturbing the duct insulation. No test ports shall be created without Shipyard approval of the test port location, and design.

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2.7.1.3 Flanged Joint Requirements:

a. At a minimum, flanged joints must be present, adjacent to the exterior wall surface of each ducting wall penetration, with adequate clearance around joint to access all fastening hardware once wall construction and insulated panel installation is complete. Refer to design drawings for minimum mandatory flanged joint locations. Duct-to-Facility connections/joint make-up shall be independent of the fasteners that are used for ductwork joint make-up (i.e., Removal of fasteners that secure ductwork to the facility shall not result in a breach of the ductwork). Duct-to-Facility connections/joint make-up shall facilitate removal of the ductwork from the facility walls without the need to disturb the facility walls (excluding insulation/cladding).

b. Where ducting wall penetrations exist such that ducting continues into interior of the enclosure, a flanged joint must also be present, adjacent to the interior wall, with adequate clearance around joint to access all fastening hardware once wall construction and plascore wall installation is complete.

c. Ducting sections shall also have bolted flanges at convenient locations such that once the system is installed it can later be disassembled into manageable sections to be rigged away without the need for cutting.

d. All transverse duct joints shall have continuous 1-1/2 inch wide flanges that turn outside of the air stream. All flanged joints shall have a minimum thickness of 1/4". In cases where ductwork components have flanges less than 1/4 inch thick, a 1/4 inch thick backing flange shall be included in the joint make-up.

e. The flange design shall provide access to all flange fasteners from the exterior of the duct. Flange material shall be structural flat bar or angle.

f. All flanges shall be drilled or punched with equally spaced 1/2 inch diameter bolt holes. Center of the bolt hole pattern shall be 9/16 inch from the outside edge of the flange. Bolt hole spacing on centers shall be 4" maximum, and uniformly spaced. Hole clearance shall be per ASME AG-1-2019.

g. All flanged joints must be continuously welded around the entire perimeter of the interior and exterior seams where the flange meets the duct (per Figure 5.2 - Acceptable Transverse Joints of the DOE

HDBK 1169-2003).

h. Mating flanges must be straight and parallel, and maintain "duct-flange perpendicularity" such that flanges are square and uniformly compress the gasket after fasteners are tightened (per Article SA-6000 of ASME AG-1-2019).

2.7.1.4 Gaskets & Joint Makeup:

a. All transverse flange joints shall be joined using gaskets and fasteners (bolts, nuts with nylon inserts, and washers). Washers shall be used on both external faces of each bolt hole along each flanged joint, that is, one washer captured by the bolt head, and the other washer captured by the nut on the other end. A flange may be counted as a reinforcement if it meets the strength requirements of a

SECTION 23 00 00 Page 13 reinforcement as defined in DOE HDBK 1169 2003.

b. Gasket tape or other sealant compounds are not acceptable to be used as a gasket for Level 2 or Level 4 joint makeup. RTV caulking, adhesives, sealant, or other similar products are not permitted to be used to smooth or seal any duct surface or joint. A minimal amount of adhesive is permitted to adhere flanged gaskets to a flanged face to facilitate joint makeup, however application is limited to mating surface between the flange and gasket such that it does not aid in sealing the joint.

c. Gaskets for flanged joints must have a matching bolting pattern such that the gasket material is fully captured by the fastening hardware.

d. Gasket dimensions shall be ¼ inch thick x 1-1/2 inches wide.

e. Gaskets shall be continuous or have tightly interlocking (dove tailed) seams.

f. If gasket seams are necessary, the seams shall be located so that bolt holes through the gaskets do not intersect a seam.

g. Gasket material shall be closed cell solid neoprene meeting Grade 2C5, 30-40 durometer, Shore-A. SMACNA duct flange gasket material shall be closed cell neoprene.

h. Flange fasteners shall be 3/8 inch diameter, non-plated, corrosion resistant, and self locking. Apply anti-seize lubricant to protect against rust, corrosion, seizing and galling.

i. Bolts shall be sized to provide at least two full thread protrusions past the nut end when the gasket is properly compressed. Nuts shall include a nylon insert to prevent backing out.

j. Prior to bolting of flanges: gaskets shall be visually examined to ensure conformance with specified dimensional tolerances and be verified free of cracks, tears, breaks, or any other defect.

k. Bolts shall be tightened in an alternating opposed pattern until uniform gasket compression can be visually verified.

l. Following bolting of flanges: flanges shall be examined to ensure bolts are in place. Gasket material shall be inspected and verified for uniform compression to ensure leak tightness. Gaskets shall be free of cracks, tears, breaks, or any other defects. The Government shall be present and take part in the flange inspections.

2.7.1.5 Flexible Duct Connectors

a. Provide flexible duct connections at both up and downstream interface connections of the Enclosure 5 and Enclosure 7 Ventilation skid and where specified on the design drawings in accordance to DOE-HDBK-1169-2003 section 5.4.2.3 to widthstand system pressures of +/- 20" w.g. Solid neoprene or EPDM, 2-ply, 1/4" thick, Holz Rubber Company Model 900 Series, or approved equal. Equivalent flexible materials reinforced with fiberglass qualified for the temperature, pressure, relative humidity of the environment may be substituted and submitted for approval. Utilize a stainless steel bolted retaining ring to the mating flange with bolt spacing 4" max on center and

SECTION 23 00 00 Page 14 corrosion resistant stainless steel bolts, nuts and washers. Nuts must contain nylon insert to prevent backing off and loosening over time.

Washers shall be installed to be captured by the bolt head and nut.

Flexible duct connectors shall be free of cracks, tears, breaks, or any other defects.

All fasteners associated with the flexible duct connectors that are located in areas within the captivation boundaries and exposed shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

2.7.1.6 Insulated Nonmetallic Flexible Duct Runouts

Flexible duct runouts shall not be used.

2.7.1.7 Adhesive-backed tape for SMACNA duct

a. Pressure sensitive rolled mastic sealant. Backing: 2 mil aluminum.

Thickness ASTM D3652, 17 mils. Peel strength ASTM D3330-83, 10 lb/linear inch. Tensile strength ASTM D412, 20 pli/1400 psi.

Elongation ASTM D412, 560%. Flexibility ASTM C765, pass. Water resistance CSTM RA 8.0, pass. VOC EPA Method #2, 0 g/l. Flame/Smoke ASTM E84/UL 723, 5/25. Service Temperature ASTM D2485/D2243, -20F to 200F. Pressure test (Independent 24 hour test up to 5/8 inch diameter), 30 in. wc. Weather Resistance ASTM G53, Pass, 2,000 QUV.

Bond time, Immediate/full bond: 15 minutes. UL 181B-FX, UL 181 tested, Passes/Listed. NFPA 90A & 90B, Class 1.

2.7.2 Dampers and Actuators

a. Damper housings and actuator shaft seals shall be selected with consideration to being capable of withstanding the max operating pressure and rated for minimal frame leakage during operation. This leakage is with concern to pressure boundary leakage which is independent of damper shutoff leakage. Shaft seals shall be provided for all dampers.

b. Dampers must be capable of being remotely manually operated remote manual unless otherwise specified.

c. Provide dampers with flanged connections to adapt to connecting duct work and so that they may be removed for maintenance as necessary.

d. Dampers must be of the correct design function per DA-1320 of ASME AG-1-2019 to suit each dampers intended purpose.

e. Mount an automated actuator on each damper shaft. Electrical connections for actuator to be installed by the Contractor. Actuator shall be proportional control, non-spring return, non-fail safe, direct coupled, 24V power supply, electronic overload protection, 2 to 10VDC and 4 to 20 milliamp input, with 2 to 10 VDC feedback signal.

Actuator shall be NEMA 4X for locations exterior of the buildings, and NEMA 2 for locations interior to the buildings. Actuator shall be motorized and capable of manual override. Actuator shall not automatically close upon loss of power or signal, unless otherwise specified on the design drawing. All dampers must have their feedback tied into the PLC. The actuator torque capacity shall meet the damper

SECTION 23 00 00 Page 15 torque requirement.

f. All fasteners associated with the dampers/actuators that are located in areas within the captivation boundaries and exposed shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

2.7.2.1 Square or Rectangular Dampers

a. Duct Height 16 inches and Less, Greenheck HCD-330, or approved equal

(1) Frames

Damper frame shall be a minimum of 10 ga. Type 304 stainless steel formed into a 8" x 2" channel with 1-1/2" flanges. Damper shall be rated at 25 in. wg. Flanges must be continuously welded around the entire perimeter of the interior and exterior seams where the flange meets the body of the damper. Flanges must be 1/4 inch thick.

(2) Blades

Damper blades shall be 12 ga. airfoil shape Type 304 stainless steel. Each blade shall be symmetrical relative to its axle pivot point, presenting identical performance characteristics with air flowing in either direction through the damper. Provide symmetrical blades of varying size as required to completely fill the damper opening. Blade orientation is horizontal. Blade operation is opposed. Provide EPDM or Silicone blade seals. Each blade stop (at top and bottom of damper frame) shall occupy no more than 3/4" of the damper opening area to allow for maximum free area and to minimize pressure loss across the damper. Dampers shall have a maximum leakage based on the damper width. At a differential pressure of 1 in. wg. the permissable leakage of an 18" wide damper is 7.7 CFM/SF, and a 14" wide damper is 9.5 CFM/SF.

(3) Blade Axles: To support the blades of dampers, provide Type 304 stainless steel round shafts supporting the blade. Axle shafts shall extend through standoff bracket. Round shafts are acceptable. Stub axles are acceptable for square or rectangular dampers. Provide double-gland shaft seal. Single gland with double wrap packing is not acceptable.

(4) Axle Bearings: Support the shaft on each end at the frames with shaft bearings. Shaft bearings shall be Type 304 stainless steel, bolted on externally, with shaft seal. Shafts seals shall be leak tight.

2.7.2.2 Round Dampers, Greenheck HCDR-350, or approved equal

a. Frames: Damper frame shall be a minimum of 14 ga. Type 304 stainless steel formed into a rolled channel frame with a minimum 1-1/2 inch flange. Damper shall be rated for 25 in. wg. maximum pressure differential with maximum velocity rating of 6400 fpm. Flanges must be continuously welded around the entire perimeter of the interior and exterior seams where the flange meets the body of the damper. Flanges must be 1/4 inch thick.

SECTION 23 00 00 Page 16

b. Blades: Damper blades shall be a minimum 10 ga. Type 304 stainless steel blade and reinforced as required to meet the system pressures it will be installed in. Blade orientation is horizontal.Blade seal is EPDM. Dampers shall have a maximum leakage based on the damper diameter. At a differential pressure of 1 in. wg. the permissable leakage of a 12" diameter damper is 1.5 CFM/SF, and a 36" diameter damper is 4 CFM/SF.

c. Blade Axles: To support the blades of dampers, provide Type 304 stainless steel shafts supporting the blade the entire duct diameter frame-to-frame. Axle shafts shall extend through standoff bracket.

Round shafts are acceptable. Axles for round dampers shall be full-length. Provide double-gland shaft seal. Single gland with double wrap packing is not acceptable.

Size Shaft Size and Shape

4 to 14 inches Minimum 3/4 inch round

17 to 24 inches Minimum 1 inch round

32 inches Minimum 1-1/2 inch round

d. Axle Bearings: Support the shaft on each end at the frames with bolt-on relubricable steel ball bearings. Shaft seals shall be adjustable packing gland type.

e. Submittals: The following submittals shall be provided for each enclosure:

Tower 5 Dampers and Actuators Tower 6 Dampers and Actuators Enclosure 6 Dampers and Actuators Enclosure 8 Dampers and Actuators Enclosure 5 and Enclosure 7 Dampers and Actuators

2.7.3 Bubbletight Dampers, Greenheck HBTR-451, or approved equal

a. Dampers shall be butterfly type consisting of circular blade, mounted to axle within formed flanged frame. Frame shall be constructed of Type 304 stainless steel channel with a clean and smooth interior surface. Blade shall be not less than 1/4 inch thick stainless steel and be complete with full circumference silicone blade seal mechanically attached to blade with full circumference retainer ring.

Damper shaft shall be continuous solid round Type 304 stainless steel extending through the entire damper diameter and extending beyond damper bearing a minimum of 6 inches. The axle shall be supported by sealed, relubricable, ball bearings mounted outboard of frame and be complete with standoff bracket and double gland axle shaft seals.

Flanges must be continuously welded around the entire perimeter of the interior and exterior seams where the flange meets the body of the damper. Flanges must be 1/4 inch thick, fully welded inside and outside. Provide double-gland shaft seal. Single gland with double wrap packing is not acceptable.

b. Provide full open and full close stops.

SECTION 23 00 00 Page 17

c. Dampers shall be designed and tested for bubbletight leakage performance at 20 in. wg. Each damper shall be tested for leakage in conformance to AMCA Standard 500-D-98; Section 8.2.3.2.

d. Temperature rating shall be 250 deg F.

2.7.4 Engineered Vent Lines

a. Connections: Provide connection as shown on the design drawings for each location where a flexible vent line will be attached per design drawings. Flow stations and dampers shall be installed at each location to support engineered vent line installation as indicated on the design drawings.

b. Airflow Measuring Stations: Provide quantity air flow measuring station with combination upstream honeycomb air equalizer and straightener with automatic averaging pitot tubes that measure static and total pressure components of airflow, 0-2,000 CFM capacity.

The airflow measuring station shall contain multiple total and static pres sure sensors positioned in a log-Tchebycheff pattern.

Locate the airflow station as shown on the design drawings.

Consult the manufacturer's literature for minimum installation requirements for locating the air flow measuring station in relation to other air stream disturbances such as elbows, branches, or transitions.

The casing shall be stainless steel with custom continuously welded 1-1/2 inch flanges 1/4 inch thick, stainless steel headers, and female NPT process connections. Flanges must be continuously welded around the entire perimeter of the interior and exterior seams where the flange meets the body of the measuring station.

Stations shall be AMCA certified and be capable of measuring airflow rates within accuracy of +/- 2%.

The maximum allowable unrecovered pressure drop caused by the station shall not exceed 0.085 inches w.g. at 2,000 FPM,or 0.30 inches w.g. at

4,000 FPM.

Provide Paragon FE-1500-FX or equivalent air flow measuring station (as evidenced with supportive product specifications).

Airflow station components must be rated for the anticipated structural capability pressure and leak tightness at the DALT pressure. Refer to specification section 23 74 00 paragraph 2.2.6.5 for Combination Pressure Gage/Sensor/Transmitters required for each airflow station. Submit for approval.

Flow stations must be able to withstand and be leak tight at the max operating pressure at each component's respective location in the system as specified by the Government.

Tubings and Fittings: Connect the airflow measuring station to the corresponding differential pressure sensor/transmitter using 3/16 ID Tygon tubing, UV resistant and vacuum rated. Provide Swagelok

SECTION 23 00 00 Page 18 fittings as shown on the drawing detail "Airflow Measuring Station Tubing Detail" Volume 2 detail D3/M-504 and Volume 3 detail D3/M-505.

All fasteners associated with the pressure gage/sensor/transmitters that are located in areas within the captivation boundaries and exposed shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

The following separate submittals for equipment shall be provided:

Tower Airflow Measuring Station Enclosure 8 Airflow Measuring Station Enclosure 5 and Enclosure 7 Airflow Measuring Station

c. Dampers and Actuators: Each engineered vent line shall be equipped with a round isolation and control damper and actuator. Damper shall be a heavy-duty industrial control damper with bolted flanged style frame rated at 20 in. wg. Frame shall be 304 stainless steel with stainless steel blade and EPDM seals. Provide Type 304 stainless steel shafts supporting the blade the entire duct diameter frame-to-frame. Axle shafts extend through standoff bracket. Support the shaft on each end with bolt-on relubricable steel ball bearings.

Shaft seals shall be adjustable packing gland type.

All fasteners associated with the dampers and actuators that are located in areas within the captivation boundaries and exposed shall meet the captivation requirements outlined in 01 11 00 Summary of Work. The specific captivation measures and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

2.7.5 Diffusers, Registers, and Grilles

Provide factory-fabricated units of corrosion-resistant steel with powder coat finish that distribute the specified quantity of air evenly over space intended without causing noticeable drafts, air movement faster than 50 fpm in occupied zone, or dead spots anywhere in the conditioned area.

Provide outlets for diffusion, spread, throw, and noise level as required for specified performance. Certify performance according to ASHRAE 70.

Provide sound rated and certified inlets and outlets according to ASHRAE 70.

Provide sound power level as indicated.

2.7.5.1 Diffusers

For Enclosure 4 provide duct diffuser types indicated on the drawings and schedules.

For supply diffusers in the towers and Enclosure 5 provide supply grilles of the sizes and mounting types indicated on the drawings and schedules.

Grilles shall be adjustable double deflection type with two sets of fully adjustable deflection blades spaces 3/4 inch on center. The front set of blades shall run parallel to the proper dimension of the grille (long or short) to direct the air flow as indicated on the drawings. Furnish with white powder coat finish. Fasteners must be permenantly secured in accordance with captivation requirements.

All fasteners associated with the diffusers that are located in areas within the captivation boundaries and exposed shall meet the captivation

SECTION 23 00 00 Page 19 requirements outlined in 01 11 00 Summary of Work. The specific captivation measures and fasteners proposed shall be clearly indicated in the product data for the associated enclosure and area.

Diffusers/grilles on supply headers shall have collars to make them flush with the outside surface of the duct insulation.

Duct openings 96 square inches and larger shall have security bars, 9 gauge steel minimum. The resulting openings between bars shall be less than 96 square inches.

2.7.5.2 Registers and Grilles

Furnish and install supply and return grilles of the sizes, materials, thickness, and mounting types indicated on the plans and grille schedule.

Tower 5 and 6 and Enclosure 8 general area return grilles shall consist of minimum 9 gauge wire mesh secured by welded angles behind the faceplate.

If 9 gauge stainless steel mesh is not available in this size, a smaller gauge can be used, with added security…