| Cryptome DVDs. Donate $25 for two DVDs of the Cryptome collection of 47,000 files from June 1996 to January 2009 (~6.9 GB). Click Paypal or mail check/MO made out to John Young, 251 West 89th Street, New York, NY 10024. The collection includes all files of cryptome.org, cryptome.info, jya.com, cartome.org, eyeball-series.org and iraq-kill-maim.org, and 23,100 (updated) pages of counter-intelligence dossiers declassified by the US Army Information and Security Command, dating from 1945 to 1985.The DVDs will be sent anywhere worldwide without extra cost.

13 June 1997

Source: http://www.hnd.usace.army.mil/techinfo/cegssgml/13976.sec (SGML format)

    See Guide Specifications for Military Construction: http://jya.com/cegs.htm

    ------------------------------------------------------------------------------

      **************************************************************************  *
      DEPARTMENT OF THE ARMY                               CEGS-13976 (June 1991)
      U.S. ARMY CORPS OF ENGINEERS                         ----------------------
                                      GUIDE SPECIFICATION FOR MILITARY CONSTRUCTION
                              Includes note relocation Special change (August 1995)
             Includes Text Adjustment Change (Section 01300 Reference)(March 1995)
                                     Includes changes through Notice 4 (April 1995)
                                        Latest Notice change indicated by  tokens
      **************************************************************************  *
                                   SECTION 13976

                              SELF-ACTING BLAST VALVES
                                       06/91

      **************************************************************************  *
                    NOTE:  This guide specification covers the
                    requirements for self-acting blast valves used for
                    blast protection of supply and exhaust air
                    systems.  This guide specification is to be used
                    in the preparation of project specifications in
                    accordance with ER 1110-345-720.
      **************************************************************************  *

    PART 1   GENERAL

      **************************************************************************  *
                    NOTE: This guide specification covers self-acting
                    blast valves for facilities subjected to blast
                    overpressures from accidental explosions,
                    conventional weapons, explosion devices used by
                    terrorists, and nuclear weapons.

                    This guide specification is intended for procurement
                    of standard products that are readily available and
                    have the required performance characteristics.  This
                    guide specification is not intended for procurement
                    of blast valves having special performance
                    characteristics such as actuation by delay paths and
                    sensor actuation since they are not readily
                    available as standard products and may require long
                    lead times for development.
      **************************************************************************  *

    1.1   REFERENCES

      **************************************************************************  *
                    NOTE:  Issue (date) of references included in
                    project specifications need not be more current than
                    provided by the latest change (Notice) to this guide
                    specification.
      **************************************************************************  *

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

                AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

      AISC-01    (1993) Load & Resistance Factor design
        Manual Vol 1 - Structural Members,
        Specifications and Codes

      AISC-04    (1989) Specification for Structural
        Steel Buildings -  Allowable Stress Design
        and Plastic Design

      AISC S303    (1992) Code of Standard Practice for
        Steel Buildings and Bridges

                AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

      ASTM A 27    (1993) Steel Castings, Carbon, for
        General Application

      ASTM A 36    (1994) Carbon Structural Steel

      ASTM A 47    (1990) Ferritic Malleable Iron Castings

      ASTM A 48    (1994a) Gray Iron Castings

      ASTM A 108    (1993) Steel Bars, Carbon, Cold
        Finished, Standard Quality

      ASTM A 123    (1989a) Zinc (Hot-Dip Galvanized)
        Coatings on Iron and Steel Products

      ASTM A 148    (1993b) Steel Castings, High
        Strength, for Structural Purposes

      ASTM A 153    (1982; R 1987) Zinc Coating (Hot-Dip) on
        Iron and Steel Hardware

      ASTM A 159    (1983; R 1993) Automotive Gray Iron
        Castings

      ASTM A 167    (1993) Stainless and Heat-Resisting
        Chromium-Nickel Steel Plate, Sheet, and Strip

      ASTM A 176    (1994) Stainless and Heat-Resisting
        Chromium - Nickel Steel Plate, Sheet, and
        Strip

      ASTM A 220    (1988; R 1993) Pearlitic Malleable Iron

      ASTM A 276    (1994b) Stainless and Heat-Resisting
        Steel Bars and Shapes

      ASTM A 278    (1993) Gray Iron Castings for
        Pressure-Containing Parts for Temperatures Up
        to 650 Degrees F

      ASTM A 297    (1993) Steel Castings, Iron-Chromium
        and Iron-Chromium-Nickel, Heat Resistant, for
        General Application

      ASTM A 307    (1994) Carbon Steel Bolts and Studs,
        60 000 psi Tensile Strength

      ASTM A 313    (1992) Chromium-Nickel Stainless and
        Heat-Resisting Steel Spring Wire

      ASTM A 351    (1993) Castings, Austenitic,
        Austenitic-Ferritic (Duplex), for Pressure -
        Containing Parts

      ASTM A 439    (1983; R 1994) Austenitic Ductile Iron
        Castings

      ASTM A 447    (1993) Steel Castings,
        Chromium-Nickel-Iron Alloy (25-12 Class), for
        High-Temperature Service

      ASTM A 536    (1984; R 1993) Ductile Iron Castings

      ASTM A 560    (1993) Castings, Chromium - Nickel
        Alloy

      ASTM A 564    (1992a) Hot-Rolled and Cold-Finished
        Age-Hardening Stainless and Heat-Resisting
        Steel Bars and Shapes

      ASTM A 666    (1994) Austenitic Stainless Steel
        Sheet, Strip, Plate, and Flat Bar

      ASTM B 85    (1992a) Aluminum-Alloy Die Castings

      ASTM B 108    (1992a) Aluminum-Alloy Permanent Mold
        Castings

      ASTM B 209    (1992a) Aluminum and Aluminum-Alloy Sheet
        and Plate

      ASTM B 211    (1993) Aluminum and Aluminum-Alloy
        Bar, Rod, and Wire

      ASTM B 221    (1993) Aluminum and Aluminum-Alloy
        Extruded Bars, Rods, Wire, Shapes, and Tubes

                AMERICAN WELDING SOCIETY (AWS)

      AWS A2.4    (1993) Standard Symbols for Welding,
        Brazing and Nondestructive Examination

      AWS A5.4    (1992) Stainless Steel Electrodes for
        Shielded Metal Arc Welding

      AWS B2.1    (1992) Welding Procedure and
        Performance Qualification

      AWS D1.1    (1994) Structural Welding Code -
        Steel

                STEEL STRUCTURES PAINTING COUNCIL (SSPC)

      SSPC Paint 25    (1991) Red Iron Oxide, Zinc Oxide, Raw
        Linseed Oil and Alkyd Primer (without Lead
        and Chromate Pigments)

    1.2   SYSTEMS DESCRIPTION

      This section specifies self-acting blast valve systems consisting of blast
      valve units and mountings.  All valve units and valve mountings shall be
      provided by one manufacturer.

    1.2.1   Contractor Design of Structural Supports

      **************************************************************************  *
                    NOTE:  Delete reference to structural steel when
                    valve casings are cast directly into concrete.
      **************************************************************************  *

      In lieu of the concrete openings and supports indicated the Contractor may
      design openings and supports to accommodate the proposed valve system.
      Openings and framing shall be designed using loads computed from the blast
      overpressures specified or indicated.  Structural steel mechanical
      properties such as minimum yield stress and tensile strength and member
      section properties shall be determined based on the proposed framing
      system.  Dynamic increase factors shall be based on applicable strain rates
      and the concrete unconfined compressive strength, concrete reinforcement
      yield stress, and structural steel yield stress.  Flexural analyses shall
      be performed using equivalent single degree of freedom or other approved
      dynamic analysis methods.  Deformation limits shall be selected by the
      Contractor such that ultimate deflections do not inhibit proper valve unit
      operation.

    1.2.2   Sustained Blast Overpressures

      **************************************************************************  *
                    NOTE:  Delete this paragraph when only triangular
                    overpressure waveforms are specified.

                    Blast overpressure waveforms may be specified or
                    indicated as sustained (infinite duration)
                    overpressures, triangular waveforms with peak
                    overpressures and finite durations, or other
                    pressure versus time histories.  When the blast
                    overpressures are low, a sustained overpressure can
                    be specified or indicated conveniently without loss
                    of economy.  When the blast overpressures are high,
                    specifying or indicating triangular waveforms will
                    enhance economy and availability.  The sustained
                    overpressures shown in the text cover tested
                    commercial products that are readily available.
                    Some triangular waveform peak overpressures and
                    durations for tested commercial products are shown
                    below.

                     Peak Overpressure  MPa (psi)      Duration (milliseconds)
                     ___________________________      _________________________

                            12.41 (1800)                         0.64
                             3.31 (480)                          3
                             2.59 (375)                         5
                             2.41 (350)                        15

                    Sustained or triangular blast overpressure waveforms
                    may be either specified or indicated on blast valve
                    schedules shown on the drawings.  Other waveforms
                    should be shown on the drawings using waveform
                    diagrams.
      **************************************************************************  *

      Casing mounted [supply valve] [exhaust valve] [valve] units shall operate
      under a zero rise time, sustained (infinite duration) blast overpressure of
      [1.793 MPa (260 psi)] [1.103 MPa (160 psi)] [276 kPa (40 psi)] [_____]
      kPa ([_____] psi) [260] [160] [40] [_____] psi [, and casing mounted
      exhaust valve units shall operate under a zero rise time, sustained
      (infinite duration) blast overpressure of [1.793 MPa (260 psi)] [1.103
      MPa (160 psi)] [276 kPa (40 psi)] [_____] kPa([_____] psi). [260] [160]
      [40] [_____] psi]].  [Valve units mounted in [supply] [exhaust] [diesel
      engine exhaust] piping or ducts shall operate under a zero rise time,
      sustained (infinite duration) blast overpressure of [1.793 MPa (260 psi)]
      [1.103 MPa (160 psi)] [276 kPa (40 psi)] [_____] kPa([_____] psi).
      [260] [160] [40] [_____] psi].

    1.2.3   Blast Overpressure Waveforms

      **************************************************************************  *
                    NOTE:  Delete this paragraph when only sustained
                    overpressures are specified.  Coordinate with
                    paragraph SUSTAINED BLAST OVERPRESSURES.
      **************************************************************************  *

      Casing mounted [supply valve] [exhaust valve] [valve] units shall operate
      under a triangular blast overpressure waveform having a zero rise time and
      a peak overpressure and duration of [_____] kPa ([_____] psi) [_____]
      psi and [_____] milliseconds [, and casing mounted exhaust valve units
      shall operate under a triangular blast overpressure waveform having a zero
      rise time and a peak overpressure and duration of [_____] kPa ([_____]
      psi) [_____] psi and [_____] milliseconds]].  [Valve units mounted in
      [supply] [exhaust] [diesel engine exhaust] piping or ducts shall operate
      under a triangular blast overpressure waveform having a zero rise time and
      a peak overpressure and duration of [_____] kPa ([_____] psi) [_____]
      psi and [_____] milliseconds.]  [Valve units shall operate under
      triangular blast overpressure waveforms having a zero rise time and the
      peak overpressures and durations indicated.]  [Valve units shall operate
      under the blast waveforms indicated.]

    1.2.4   Performance Requirements

    1.2.4.1   Field Removable Valve Units

      Blast valve units shall be completely removable from casings or other
      mountings.

    1.2.4.2   Penetrations

      Except for air flow openings, any penetrations through the valve system
      shall be sealed against blast leakage through the penetration.

    1.3   SUBMITTALS

      **************************************************************************  *
                    NOTE:  Submittals must be limited to those necessary
                    for adequate quality control.  The importance of an
                    item in the project should be one of the primary
                    factors in determining if a submittal for the item
                    should be required.

                    Indicate submittal classification in the blank space
                    using "GA" when the submittal requires Government
                    approval or "FIO" when the submittal is for
                    information only.
      **************************************************************************  *

      Government approval is required for submittals with a "GA" designation;
      submittals having an "FIO" designation are for information only.  The
      following shall be submitted in accordance with Section 01300 SUBMITTAL
      PROCEDURES:

      SD-01 Data

      Self-Acting Blast Valves; [_____].

      Valve unit data consisting of catalog cuts, brochures, circulars,
      specifications, and product data that shows complete dimensions and
      completely describe overpressure ratings, pass-through impulse leakage
      ratings, air flow rates, actuation mechanisms, and materials.  When this
      data shows several products, the actual products proposed shall be clearly
      identified.

      Contractor Design of Structural Supports; [_____].

      Design and analysis calculations showing concrete opening and framing
      systems requiring changes to accommodate the proposed valve casings.  When
      applicable, analysis and calculations shall include a narrative discussion
      of the analysis techniques used; sketches showing the design overpressure
      loadings, member cross-sections, layouts and dimensions; elastic and
      plastic section properties for all load-carrying members; minimum yield and
      tensile strengths for steel materials; plastic moment capacities for
      load-carrying members; resistance function sketches showing equivalent
      ultimate resistance and elastic deflections; and design deformation limits
      and response values for maximum deflections, ductility ratios, and support
      rotations.  Design and analysis calculations shall be stamped by a
      Registered Professional Engineer experienced in dynamic analysis and design
      methods.

      SD-04 Drawings

      Contractor Design of Structural Supports; [_____].

      Fabrication, erection, and installation drawings when concrete opening and
      framing systems require changes to accommodate proposed valve casings.
      These drawings shall show framing layouts, elevations, sections, enlarged
      details, casing locations with dimensions, connections, and material
      designations.  Weld symbols used shall conform to AWS A2.4.

      SD-06 Instructions

      Self-Acting Blast Valves; [_____].

      Manufacturer's instructions for valve unit and casing installation and
      field testing.

      SD-08 Statements

      Manufacturer's Field Service; [_____].

      Information describing training to be provided, training aids to be used,
      and a description of the training.

      SD-09 Reports

      Blast Tests on Prototype Valve Units; [_____].  Factory Air Flow
      Tests; [_____].  Tests; [_____].

      Certified blast and air flow test reports for valve units, including the
      name and location of the testing agency or laboratory, the date of the
      tests, a description of the valve units tested, the overpressure waveforms,
      and the testing apparatus.  The test reports shall document the
      pass-through impulse leakage, the ability of the valve units to resist the
      specified loads, and the air flow rate versus pressure loss characteristics
      over the operating pressures.  Test reports shall include an analysis and
      interpretation of test results.

      SD-13 Certificates

      Self-Acting Blast Valves; [_____].

      Certificates stating that the valves provided were manufactured using the
      same materials, dimensions and tolerances as blast tested prototype valve
      units and that air flow and pressure drop rating meet specification
      requirements.  Each certificate shall be signed by an official authorized
      to certify in behalf of the manufacturer and shall identify the quantity
      and date of shipment or delivery to which the certificate applies.

      SD-19 Operation and Maintenance Manuals

      Self-Acting Blast Valves; [_____].

      Information bound in manual format consisting of manufacturer's safety
      precautions, preventative maintenance and schedules, troubleshooting
      procedures, special tools, parts list, and spare parts data.  All data
      shall be edited to cover only the valves furnished.

    1.4   QUALIFICATIONS

      Welders, welding operators, welding procedures, and weld inspectors shall
      be qualified in accordance with AWS B2.1 or AWS D1.1, as
      applicable.

    1.5   DELIVERY AND STORAGE

      Valve units, casings, and accessories delivered and placed in storage shall
      be protected from weather, excessive humidity and temperature variation,
      and dirt, dust, or other contaminants.

    1.6   WARRANTY

      Manufacturer's written warranty covering valve units for 2 years after
      installation and acceptance by the Government shall be furnished.  This
      warranty shall provide for repair or replacement of the valve units in the
      event of malfunction due to defects in materials or workmanship except that
      finishes need only be warranted for 1 year and the warranty need not cover
      cleaning and other normal maintenance.

    PART 2   PRODUCTS

    2.1   MATERIALS

    2.1.1   Iron Castings

      Iron castings shall conform to ASTM A 47, ASTM A 48, ASTM A
      159, ASTM A 220, ASTM A 278, ASTM A 439, or ASTM A 536.

    2.1.2   Steel Castings

      Carbon and alloy steel castings shall conform to ASTM A 27 Grades
      U-60-30, 65-35, 70-36 or 70-40, or ASTM A 148.

    2.1.3   Corrosion Resistant Alloy Steel Castings

      Corrosion resistant alloy steel castings shall conform to ASTM A 297,
      ASTM A 351, ASTM A 447, or ASTM A 560.

    2.1.4   Structural Steel

      Structural steel shall conform to ASTM A 36.

    2.1.5   Stainless Steel

    2.1.5.1   Plate, Sheet, and Strip

      Stainless steel plate, sheet, and strip shall conform to ASTM A 167,
      ASTM A 176, or ASTM A 666.

    2.1.5.2   Bars and Shapes

      Stainless steel bars and shapes shall conform to ASTM A 276 or ASTM A
      564.

    2.1.5.3   Spring Wire

      Stainless steel spring wire shall conform to ASTM A 313.

    2.1.6   Aluminum

    2.1.6.1   Castings

      Aluminum-alloy castings shall conform to ASTM B 85 or ASTM B 108.

    2.1.6.2   Sheet and Plate

      Aluminum sheet and plate shall conform to ASTM B 209.

    2.1.6.3   Bars and Rods

      Aluminum bars and rods shall conform to ASTM B 211 or ASTM B 221.

    2.1.7   Anchors

      Concrete anchors shall conform to ASTM A 36, ASTM A 108 or ASTM A
      307.

    2.1.8   Primer

      **************************************************************************  *
                    NOTE:  Delete paragraph on primer when casing
                    supports are galvanized and when valves are mounted
                    in piping or ducts.
      **************************************************************************  *

      Primer shall conform to SSPC Paint 25.

    2.2   COMPONENTS

      **************************************************************************  *
                    NOTE:  Except for diesel exhaust piping, select
                    single-acting nonlatching, double-acting nonlatching
                    or latching type valves.  Double-acting nonlatching
                    valves are the least expensive.
      **************************************************************************  *

      Valves shall close under the positive blast overpressures specified or
      indicated and shall be fully operational after the blast.

    2.2.1   Blast Operation of Valves Mounted in Casing Supports

      [[Supply valves] [Valves] shall be the single-acting nonlatching type that
      automatically return to the open position except that double-acting valves
      that close under both positive and negative overpressure may be substituted
      for single-acting valves.]  [[Supply valves] [Valves] shall be the
      double-acting nonlatching type that close under both positive and negative
      blast pressure and automatically return to the open position.]  [[Supply
      valves] [Valves] shall be the latching type that remain in the closed
      position until manually released.]  [Exhaust valves shall be the
      single-acting nonlatching type that automatically return to the open
      position except that double-acting valves that close under both positive
      and negative overpressure may be substituted for single-acting valves.]
      [Exhaust valves shall be the double-acting nonlatching type that close
      under both positive and negative blast pressure and automatically return to
      the open position.]  [Exhaust valves shall be the latching type that remain
      in the closed position until manually released.]

    2.2.2   Blast Operation of Valves Mounted in Piping or Ducts

      [Valves mounted in diesel engine exhaust piping or ducts shall be the
      single-acting nonlatching type that return to the open position under the
      diesel exhaust pressure.]  [[Supply valves] [Valves] mounted in piping or
      ducts shall be the single-acting nonlatching type that automatically return
      to the open position except that double-acting valves that close under both
      positive and negative overpressure may be substituted for single-acting
      valves.]  [[Supply valves] [Valves] mounted in piping or ducts shall be the
      double-acting nonlatching type that close under both positive and negative
      blast pressure and automatically return to the open position.]  [[Supply
      valves] [Valves] mounted in piping or ducts shall be the latching type that
      remain in the closed position until manually released.]  [Exhaust valves
      mounted in piping or ducts shall be the single-acting nonlatching type that
      automatically return to the open position except that double-acting valves
      that close under both positive and negative overpressure may be substituted
      for single-acting valves.]  [Exhaust valves mounted in piping or ducts
      shall be the double-acting nonlatching type that close under both positive
      and negative blast pressure and automatically return to the open position.]
      [Exhaust valves mounted in piping or ducts shall be the latching type that
      remain in the closed position until manually released.]

    2.2.3   Pass Through Impulse

      **************************************************************************  *
                    NOTE:  Specify low pass-through impulse when valves
                    are in close proximity to filters and higher
                    pass-through impulse when valves vent to expansion
                    chambers or other open unoccupied areas.
      **************************************************************************  *

      The incident pass-through impulse leakage behind the valve shall not exceed
      [48.3 kPa-milliseconds (7 psi-milliseconds)] [137.9 kPa-milliseconds (20
      psi-milliseconds)] [_____] kPa-milliseconds ([_____] psi-milliseconds)
      [7] [20] [_____] psi-milliseconds [for supply valves nor [48.3
      kPa-milliseconds (7 psi-milliseconds)] [137.9 kPa-milliseconds (20
      psi-milliseconds)] [_____] kPa-milliseconds ([_____] psi-milliseconds)
      [7] [20] [_____] psi-milliseconds for exhaust valves].

    2.2.4   Minimum Operating Overpressure

      **************************************************************************  *
                    NOTE:  Insert appropriate minimum blast
                    overpressure.
      **************************************************************************  *

      Valves shall completely close under a minimum blast overpressure of [4.1
      kPa (0.6 psi)] [_____] kPa ([_____] psi). [0.6] [_____] psi.

    2.2.5   Operating Temperatures

      **************************************************************************  *
                    NOTE:  Edit appropriate temperature requirements.
                    Do not include temperature ranges in the
                    specifications when operating temperatures are shown
                    on a valve schedule.
      **************************************************************************  *

      Valve units shall be fully operational over [a temperature range from
      [minus 20 to plus 77 degrees C (minus 4 to plus 170 degrees F)] [_____]
      to [_____] degrees C ([_____] to [_____] degrees F) [-4] [_____] to
      [170] [_____] degrees F] [a temperature range from [minus 20 to plus 77
      degrees C (minus 4 to plus 170 degrees F)] [_____] to [_____] degrees C
      ([_____] to [_____] degrees F) [-4] [_____] to [170] [_____] degrees
      F for supply valves and [minus 20 to plus 149 degrees C (minus 4 to
      plus 300 degrees F)] [_____] to [_____] degrees C ([_____] to [_____]
      degrees F) [-4] [_____] to [300] [_____] degrees F for exhaust
      valves] [the temperature ranges indicated] [except that the maximum
      operating temperature for valves mounted in diesel exhaust piping or ducts
      shall not be less than [454 degrees C (850 degrees F)] [649 degrees C
      (1200 degrees F)] [_____] degrees C ([_____] degrees F). [850] [1200]
      [_____] degrees F].

    2.2.6   Air Flow Capacity

      **************************************************************************  *
                    NOTE:  Edit value of air flow pressure drop.  Delete
                    pressure drop in the specifications when pressure
                    drops are shown on a valve schedule.
      **************************************************************************  *

      Valves shall meet the air flow rates [and pressure drops] indicated on the
      valve schedules.  [The total pressure drop across each casing mounted
      supply and exhaust valve shall not exceed [254 Pa (1 inch of water)]
      [_____] Pa ([_____] inch of water) [1] [_____] inch of water gage at
      the air flows indicated.]  [The total pressure drop across each valve
      mounted in [diesel engine exhaust] [supply and exhaust] piping or ducts
      shall not exceed [_____] Pa ([_____] inch of water)] [_____] inch of
      water gage at the flows indicated.]

    2.3   ACCESSORIES

      Blast valve systems shall be complete with valve units, casings, fasteners,
      anchors, and all other accessories required to provide a complete, operable
      installation.

    2.4   FABRICATION

      Valve units and mountings shall be factory fabricated units.  Valve units
      shall be connected to mountings using approved bolts, nuts, and washers.
      Welding shall be in accordance with AWS D1.1.  Stainless steel shall be
      welded using electrodes conforming to AWS A5.4.

    2.4.1   Valve Units

      Valve units shall be atmospheric corrosion resistant.  Valve bodies shall
      be fabricated from iron, steel or aluminum-alloy castings except that
      bodies for valves mounted in diesel engine exhaust piping or ducts shall be
      fabricated from corrosion resistant alloy steel castings.  Internal parts
      such as spindles and pressure disks shall be fabricated from stainless
      steel or aluminum.  Helical springs shall be fabricated from stainless
      steel spring wire.  Special iron, steel and aluminum-alloy castings used to
      fabricate valve bodies, and special stainless steels and aluminum-alloys
      used to fabricate internal parts will be permitted when the materials used
      in the valve units provided are the same as those used in blast tested
      prototype valve units.  Valve surfaces that contact to prevent blast
      leakage shall be machined or fitted with approved neoprene gaskets to
      ensure a tight fit.

    2.4.2   Casing Supports

      **************************************************************************  *
                    NOTE:  Specify ground smooth welds when appearance
                    is important.
      **************************************************************************  *

      Valve casing supports shall be structural steel fabricated in accordance
      with either AISC-04 or AISC-01.  Groove welds used to splice
      face plates shall be complete penetration welds with complete joint fusion.
      In order to reduce distortion and residual stresses, a welding sequence
      shall be used.  All welds shall be stress relieved, and welded casings
      shall be post weld straightened.  Fabricated steel shall be well-formed to
      shape and size, with sharp lines and angles.  Intermediate and corner
      joints shall be coped or mitered.  Exposed welds other than fillet welds
      shall be ground smooth.

    2.4.3   Pipe Mountings

      Valves indicated for installation in piping systems shall be flange
      connected.  Flange dimension shall be compatible with the piping specified
      or indicated or companion flanges shall be provided and welded to the
      adjacent piping.

    2.4.4   Surface Preparations, Coatings, and Finishes

      The coatings and finishes used shall be suitable for preventing atmospheric
      corrosion and shall be resistant to heat damage under the operating
      temperatures specified.

    2.4.4.1   Valve Unit Finishes

      All ferrous metal surfaces other than stainless steel shall be prepared and
      factory coated and finished using the manufacturer's standard process.

    2.4.4.2   Casing Support Finishes

      **************************************************************************  *
                    NOTE:  Edit option for galvanizing or priming and
                    painting.  Priming and painting is recommended for
                    most applications.
      **************************************************************************  *

      [Valve support casings shall be galvanized in accordance with ASTM A
      123 except that surfaces that will be embedded in concrete need not be
      galvanized.  Exposed portions of concrete anchors, fasteners that connect
      casing parts, and fasteners that connect valve units to casings shall be
      galvanized in accordance with ASTM A 153.]  [Valve support casings
      shall be prepared for priming in accordance with either AISC-04 or
      AISC-01 and factory primed and finish painted, except that surfaces
      that will be embedded in concrete need not be primed and shall not be
      finish painted.  Finish painting shall be the manufacturer's standard.]

    2.5   TESTS, INSPECTIONS, AND VALIDATIONS

    2.5.1   Blast Tests on Prototype Valve Units

      Validation of valve performance under blast shall be accomplished by blast
      tests performed on prototype valve units.  Such tests shall validate that
      the specified pass-through impulse leakage is not exceeded and that the
      valve unit is fully operational after blast loading.  When finite duration
      overpressure waveforms are specified, the overpressure waveforms used in
      the prototype test shall exceed the specified waveforms in both
      overpressure and impulse.

    2.5.2   Factory Air Flow Tests

      **************************************************************************  *
                    NOTE:  Edit air flow test requirements.
      **************************************************************************  *

      Valve units shall be factory air flow tested to ensure that assembled valve
      units meet the air flow rates and pressure drops specified or indicated.
      Product sampling and air flow testing methods and procedures shall be the
      manufacturer's standard except that at least [5] [_____] percent of the
      total number of each valve type shall be tested.

    2.5.3   Verification Inspection of Welds

      Verification inspection of welds shall be performed by the Contractor in
      accordance with AWS D1.1.

    PART 3   EXECUTION

    3.1   INSTALLATION

    3.1.1   Valve Units

      Valve units shall be installed in accordance with the valve manufacturer's
      written instructions.

    3.1.2   Casing Supports

      Structural steel casing supports shall be erected in accordance with the
      manufacturer's instructions, AISC S303 and either AISC-04 or
      AISC-01.

    3.2   TESTS

      Field tests on valve units shall be performed in accordance with the valve
      manufacturer's written instructions and the testing requirements specified
      in other specification sections.

    3.3   MANUFACTURER'S FIELD SERVICE

      **************************************************************************  *
                    NOTE:  Specify field service for large valve
                    installations.  Edit instruction period duration and
                    instruction videotape requirements.
      **************************************************************************  *

      Upon completion of the work, and at a time designated by the Contracting
      Officer, the services of one engineer and other technical personnel as
      required shall be provided for a period of not less than [4] [_____] hours
      to instruct Government personnel in the operation and maintenance of the
      blast valves and all other items furnished under this specification
      section.  The instructions shall also include use of the operation and
      maintenance manual.  The instructions shall include videotapes.  An
      instruction outline and procedure shall be submitted and approved prior to
      scheduling the instruction.  One copy of all instruction material including
      videotapes shall be provided at the time of instruction.

              -- End of Section --