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HomeMy WebLinkAbout23 23 00 - Refrigerant PipingBEARDSLEY DESIGN ASSOCIATES CORNELL – NCP REFRIGERANT PIPING STANDARD SPECIFICATIONS 23 23 00 – PAGE 1 OF 4 NOVEMBER 2, 2012 SECTION 232300 REFRIGERANT PIPING PART 1 GENERAL 1.1 SUBMITTALS A. Product Data: Provide for each type of valve and refrigerant piping specialty indicated. Include pressure drop, based on manufacturer's test data, for the following: 1. Copper tube. 1.2 QUALITY ASSURANCE A. Welding: Qualify procedures and personnel according to ASME Boiler and Pressure Vessel Code: Section IX, "Welding and Brazing Qualifications." B. Comply with ASHRAE 15, "Safety Code for Refrigeration Systems." C. Comply with ASME B31.5, "Refrigeration Piping and Heat Transfer Components." 1.3 PRODUCT STORAGE AND HANDLING A. Store piping in a clean and protected area with end caps in place to ensure that piping interior and exterior are clean when installed. 1.4 COORDINATION A. Coordinate size and location of roof curbs, equipment supports, and roof penetrations. PART 2 PRODUCTS 2.1 PERFORMANCE REQUIREMENTS A. Line Test Pressure for Refrigerant R=410A: 1. Suction Lines for Air=Conditioning Applications: 300 psig (2068 kPa). 2. Suction Lines for Heat=Pump Applications: 535 psig (3689 kPa). 3. Liquid Lines: 535 psig (3689 kPa). 2.2 REFRIGERANTS A. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1. Atofina Chemicals, Inc. 2. DuPont Company; Fluorochemicals Div. 3. Honeywell, Inc.; Genetron Refrigerants. 4. INEOS Fluor Americas LLC. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP REFRIGERANT PIPING STANDARD SPECIFICATIONS 23 23 00 – PAGE 2 OF 4 NOVEMBER 2, 2012 B. ASHRAE 34, R=410A: Pentafluoroethane/Difluoromethane. 2.3 COPPER TUBE AND FITTINGS A. Copper Tube: ASTM B 280, Type ACR. B. Wrought=Copper Fittings: ASME B16.22. C. Wrought=Copper Unions: ASME B16.22. D. Brazing Filler Metals: AWS A5.8. E. Flexible Connectors: 1. Body: Tin=bronze bellows with woven, flexible, tinned=bronze=wire= reinforced protective jacket. 2. End Connections: Socket ends. 3. Offset Performance: Capable of minimum 3/4=inch (20=mm) misalignment in minimum 7=inch= (180=mm=) long assembly. 4. Pressure Rating: Factory test at minimum 500 psig (3450 kPa). 5. Maximum Operating Temperature: 250 deg F (121 deg C). PART 3 EXECUTION 3.1 PIPING APPLICATIONS FOR REFRIGERANT R=410A A. Suction Lines NPS 1=1/2 (DN 40) and Smaller Copper, Type ACR, annealed=temper tubing and wrought=copper fittings with brazed joints. B. Liquid Lines Copper, Type ACR, annealed= or drawn=temper tubing and wrought=copper fittings with brazed joints. 3.2 PIPING INSTALLATION A. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems; indicated locations and arrangements were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviations to layout are approved on Shop Drawings. B. Install refrigerant piping according to ASHRAE 15. C. Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas. D. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise. E. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal. BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP REFRIGERANT PIPING STANDARD SPECIFICATIONS 23 23 00 – PAGE 3 OF 4 NOVEMBER 2, 2012 F. Install piping adjacent to machines to allow service and maintenance. G. Install piping free of sags and bends. H. Install fittings for changes in direction and branch connections. I. Select system components with pressure rating equal to or greater than system operating pressure. J. Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings. K. Arrange piping to allow inspection and service of refrigeration equipment. Install valves and specialties in accessible locations to allow for service and inspection. Install access doors or panels if valves or equipment requiring maintenance is concealed behind finished surfaces. L. Install refrigerant piping in protective conduit where installed belowground. M. Install refrigerant piping in rigid or flexible conduit in locations where exposed to mechanical injury. N. Slope refrigerant piping as follows: 1. Install horizontal suction lines with a uniform slope downward to compressor. 2. Install traps and double risers to entrain oil in vertical runs. 3. Liquid lines may be installed level. O. Install piping with adequate clearance between pipe and adjacent walls and hangers or between pipes for insulation installation. P. Install sleeves for piping penetrations of walls, ceilings, and floors. Q. Install sleeve seals for piping penetrations of concrete walls and slabs. 3.3 HANGERS AND SUPPORTS A. Install the following pipe attachments: 1. Adjustable steel clevis hangers for individual horizontal runs less than 20 feet (6 m) long. 2. Roller hangers and spring hangers for individual horizontal runs 20 feet (6 m) or longer. 3. Pipe Roller: MSS SP=58, Type 44 for multiple horizontal piping 20 feet (6 m) or longer, supported on a trapeze. 4. Spring hangers to support vertical runs. B. Install hangers for copper tubing with the following maximum spacing and minimum rod sizes: 1. NPS 1/2 (DN 15): Maximum span, 60 inches (1500 mm); minimum rod size, 1/4 inch (6.4 mm). BEARDSLEY DESIGN ASSOCIATES CORNELL – NCP REFRIGERANT PIPING STANDARD SPECIFICATIONS 23 23 00 – PAGE 4 OF 4 NOVEMBER 2, 2012 2. NPS 5/8 (DN 18): Maximum span, 60 inches (1500 mm); minimum rod size, 1/4 inch (6.4 mm). 3. NPS 1 (DN 25): Maximum span, 72 inches (1800 mm); minimum rod size, 1/4 inch (6.4 mm). C. Support multifloor vertical runs at least at each floor. 3.4 FIELD QUALITY CONTROL A. Perform tests and inspections and prepare test reports. B. Tests and Inspections: 1. Comply with ASME B31.5, Chapter VI. 2. Test refrigerant piping, specialties, and receivers. Isolate compressor, condenser, evaporator, and safety devices from test pressure if they are not rated above the test pressure. 3. Test high= and low=pressure side piping of each system separately at not less than the pressures indicated in Part 1 "Performance Requirements" Article. a. Fill system with nitrogen to the required test pressure. b. System shall maintain test pressure at the manifold gage throughout duration of test. c. Test joints and fittings with electronic leak detector or by brushing a small amount of soap and glycerin solution over joints. d. Remake leaking joints using new materials, and retest until satisfactory results are achieved. 3.5 SYSTEM CHARGING A. Charge system per manufacturer’s written instructions END OF SECTION 23 23 00