SECTION 15535-REFRIGERANT PIPING AND SPECIALTIES FOR HVAC by 0vb89c4

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                                            SECTION 23 23 00

                                 REFRIGERANT PIPING FOR HVAC
                                  (Edited from DeCA September 2011 Design Criteria)



PART 1 - GENERAL


1.1        SUMMARY

      A.   Section Includes:

           1.    Piping.
           2.    Refrigerant.
           3.    Flexible connections.

      B.   Related Sections:

           1.    Division 01 Section Mechanical, Refrigeration, Food Service Equipment and Electrical
                 Coordination.
           2.    Division 01 Section Environmental Procedures for Refrigerants.
           3.    Division 01 Section Quality Control.
           4.    Division 01 Section Closeout Procedures.
           5.    Division 23 Section Hangers and Supports for HVAC Piping and Equipment.
           6.    Division 23 Section Vibration and Seismic Controls for HVAC Piping and Equipment.
           7.    Division 23 Section HVAC Piping Insulation.
           8.    Division 23 Section Instrumentation and Control Devices for HVAC.
           9.    Division 26 Electrical.


1.2        QUALITY CONTROL

      A.   The following publications form a part of this specification to the extent they are applicable:


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           1.    Division 01 Section Quality Control.
           2.    ARI 710 - Liquid Line Dryers.
           3.    ARI 730 - Flow-Capacity Rating and Application of Suction-Line Filters and Filter-Driers
           4.    ASHRAE 15 - Safety Standard for Refrigeration Systems.
           5.    ASHRAE 34 - Number Designation and Safety Classifications of Refrigerants.
           6.    ASME B16.22 - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.
           7.    ASME B16.26 - Cast Copper Alloy Fittings For Flared Copper Tubes.
           8.    ASME B31.5 - Refrigeration Piping and Heat Transfer Components.
           9.    ASME B31.9 - Building Services Piping.
           10.   ASTM B88 - Seamless Copper Water Tube.
           11.   ASTM B280 - Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.
           12.   ASTM F708 - Design and Installation of Rigid Pipe Hangers.
           13.   AWS A5.8 - Brazing Filler Metal - Specification for Filler Metals for Brazing and Braze
                 Welding.
           14.   MSS SP58 - Pipe Hangers and Supports - Materials, Design, Manufacturer, Selection,
                 Application and Installation.
           15.   MSS SP69 - Pipe Hangers and Supports - Selection and Application.
           16.   MSS SP89 - Pipe Hangers and Supports - Fabrication and Installation Practices.


1.3        SUBMITTALS

      A.   Submittals for Review:

           1.    Submit under provisions of Division 01 Section Quality Control.

      B.   Indicate schematic layout of system, including equipment, critical dimensions, and sizes developed
           by the Condensing Unit Manufacture Submittals At Project Closeout:

           1.    Division 01 Section Closeout Procedures.
           2.    Project Record Documents: Record actual locations of components.
           3.    Operation and Maintenance Data: Include operation, maintenance, and inspection data,
                 replacement part numbers and availability, and service depot location and telephone number.
           4.    Warranty: Submit compressor manufacturer warranty and ensure forms have been
                 completed in Government's name and registered with manufacturer.
           5.    The Contractor shall submit all certifications and testing data as a supplement to previously
                 submitted O & M manuals at contract closeout.


1.4        DELIVERY, STORAGE, AND HANDLING

      A.   Deliver and store piping and specialties in shipping containers with labeling in place.

      B.   Protect piping and specialties from entry of contaminating material by leaving end caps and plugs in
           place until installation.

      C.   Dehydrate and charge components such as piping and receivers, seal prior to shipment, until
           connected into system.




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1.5        QUALIFICATIONS

      A.   Installer: Company specializing in performing the work of this Section with minimum three years
           documented experience.

      B.   Design piping system under direct supervision of a Professional Engineer experienced in design of
           this work, licensed in one of the states of the United States of America, and employed or approved
           by the manufacturer of the equipment.


1.6        REGULATORY REQUIREMENTS

      A.   Conform to IMC ASME B31.9 for installation of piping system.

      B.   Products Requiring Electrical Connection: Listed and classified by UL, as suitable for the purpose
           indicated.


PART 2 - PRODUCTS


2.1        PIPING

      A.   Copper Tubing: ASTM B280, Type ACR hard drawn.

           1.    Fittings: ASME B16.22 wrought copper.
           2.    Joints: Braze, AWS A5.8 BCuP silver/phosphorus/copper alloy with melting range 1190 to
                 1480 deg F.

      B.   Copper Tubing to 7/8 inch OD: ASTM B88, Type K, annealed.

           1.    Fittings: ASME B16.26 cast copper.
           2.    Joints: Flared.

      C.   Pipe Supports and Anchors:

           1.    See Division 23 Section Hangers and Supports for HVAC Piping and Equipment.


2.2        REFRIGERANT

      A.   Refrigerant: ASHRAE 34:

           1.    R-410A.


2.3        FLEXIBLE CONNECTORS

      A.   500 psig minimum operating pressure; seamless tin-bronze core, high-tensile bronze-braid
           covering, and solder-joint end connections: dehydrated, pressure tested, minimum 7 inches long.




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2.4        DRAIN PIPING

      A.   Type DWV copper with wrought, copper fittings.


PART 3 - EXECUTION


3.1        SYSTEM DESCRIPTION

      A.   Where more than one piping system material is specified ensure system components are
           compatible and joined to ensure the integrity of the system is not jeopardized. Provide necessary
           joining fittings. Ensure flanges, union, and couplings for servicing are consistently provided.

      B.   Provide pipe hangers and supports in accordance with MSS SP69 unless indicated otherwise.

      C.   Solenoid Valves:

           1.    Use in liquid line of systems operating with single pump-out or pump-down compressor
                 control.
           2.    Use in liquid line of single or multiple evaporator systems.
           3.    Use in oil bleeder lines from flooded evaporators to stop flow of oil and refrigerant into the
                 suction line when system shuts down.

      D.   Flexible Connectors: Utilize at or near condensing units or coils in resiliently mounted equipment
           where piping configuration does not absorb vibration.


3.2        FIELD QUALITY CONTROL

      A.   Pressure test system with dry nitrogen to 200 psig. Perform final tests at 27 inches vacuum and
           200 psig using electronic leak detector. Test to no leakage.


3.3        PREPARATION

      A.   Ream pipe and tube ends. Remove burrs.

      B.   Remove scale and dirt on inside and outside before assembly.

      C.   Prepare piping connections to equipment with flanges or unions.


3.4        INSTALLATION

      A.   Install refrigerant piping according to ASHRAE 15.

      B.   Basic piping installation requirements are specified in Division 23 Section Common Work Results
           for HVAC.

      C.   Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings.



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      D.   Arrange piping to allow inspection and service of compressor and other equipment. Install valves
           and specialties in accessible locations to allow for service and inspection.

      E.   Install piping with adequate clearance between pipe and adjacent walls and hangers or between
           pipes for insulation installation. Use sleeves through floors, walls, or ceilings, sized to permit
           installation of full-thickness insulation.

      F.   Below ground, install copper tubing in protective PVC Pipe. Install copper tubing in rigid or flexible
           conduit in locations where copper tubing will be exposed to mechanical injury.

      G.   Slope refrigerant piping as follows:

           1.    Install horizontal hot-gas discharge piping with a uniform slope of 1 inch for every 20 feet
                 downward away from compressor.
           2.    Install horizontal suction lines with a uniform slope of 1 inch for every 20 feet downward to
                 compressor.
           3.    Install traps and double risers where required to entrain oil in vertical runs.
           4.    Liquid lines may be installed level.

      H.   Install bypass around moisture-liquid indicators in lines larger than NPS 2 inch.

      I.   Install unions to allow removal of solenoid valves, pressure-regulating valves, and expansion valves
           and at connections to compressors and evaporators.

      J.   When brazing, remove solenoid-valve coils and sight glasses; also remove valve stems, seats, and
           packing, and accessible internal parts of refrigerant specialties. Do not apply heat near expansion
           valve bulb.

      K.   Hanger, support, and anchor products are specified in Division 23 Section Hangers and Supports
           for HVAC Piping and Equipment.

      L.   Install hangers for copper tubing with the following maximum spacing and minimum rod sizes:

           1.    NPS 1/2: Maximum span, 60 inches; minimum rod size, 1/4-inch.
           2.    NPS 5/8: Maximum span, 60 inches; minimum rod size, 1/4-inch.
           3.    NPS 1: Maximum span, 72 inches; minimum rod size, 1/4-inch.
           4.    NPS 1-1/4: Maximum span, 96 inches; minimum rod size, 3/8-inch.
           5.    NPS 1-1/2: Maximum span, 96 inches; minimum rod size, 3/8-inch.
           6.    NPS 2: Maximum span, 96 inches; minimum rod size, 3/8-inch.
           7.    NPS 2-1/2: Maximum span, 108 inches; minimum rod size, 3/8-inch.
           8.    NPS 3: Maximum span, 10 feet; minimum rod size, 3/8-inch.
           9.    NPS 4: Maximum span, 12 feet; minimum rod size, 1/2-inch.

      M.   Support vertical runs at each floor.


3.5        PIPE JOINT CONSTRUCTION

      A.   Braze joints according to Division 23 Section Common Work Results for HVAC.

      B.   Fill pipe and fittings with an inert gas (nitrogen or carbon dioxide) during brazing to prevent scale
           formation.



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3.6        FIELD QUALITY CONTROL

      A.   Test and inspect refrigerant piping according to ASME B31.5, Chapter VI.

           1.    Test refrigerant piping, specialties, and receivers.     Isolate compressor, condenser,
                 evaporator, and safety devices from test pressure.

           2.    Test high- and low-pressure side piping of each system with dry nitrogen to 200 psig.
                 Perform final tests at 27 inches vacuum and 200 psig using electronic leak detector. Test to
                 no leakage.


                                            END OF SECTION




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