VA 23 23 00-2010 REFRIGERANT PIPING.pdf

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1、02-10 23 23 00-1 SECTION 23 23 00 REFRIGERANT PIPING SPEC WRITER NOTE: 1. Delete between / - / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION /A. Field refrigerant piping for direct exp

2、ansion HVAC systems. / Field refrigerant piping and associated drain and condenser water piping for walk-in coolers and freezers, including required pipe insulation. / Field refrigerant piping and associated drain and condenser water piping for laboratory refrigerators, including required pipe insul

3、ation. / Field refrigerant piping and associated drain and condenser water piping for mortuary refrigerators, including required pipe insulation. / /B. Refrigerant piping shall be sized, selected, and designed either by the equipment manufacturer or in strict accordance with the manufacturers publis

4、hed instructions. The schematic piping diagram shall show all accessories such as, stop valves, level indicators, liquid receivers, oil separator, gauges, thermostatic expansion valves, solenoid valves, moisture separators and driers to make a complete installation. C. Definitions: 1. Refrigerating

5、system: Combination of interconnected refrigerant-containing parts constituting one closed refrigeration circuit in which a refrigerant is circulated for the purpose of extracting heat. a. Low side means the parts of a refrigerating system subjected to evaporator pressure. b. High side means the par

6、ts of a refrigerating system subjected to condenser pressure. 2. Brazed joint: A gas-tight joint obtained by the joining of metal parts with alloys which melt at temperatures higher than 449 degrees C (840 degrees F) but less than the melting temperatures of the joined parts. 1.2 RELATED WORK /A. Se

7、ction 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPOENTS: Seismic requirements for non-structural equipment./ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23 00-2 B. Section 13 21 29, CONSTENT TEMPERATURE ROOMS: Piping

8、requirements for laboratory equipment. C. Section 11 41 21, WALK-IN COOLERS and FREEZERS: Piping requirements for freezers and refrigerators. D. Section 11 53 23, LABORATORY REFRIGERATORS: Piping requirements for freezers and refrigerators. E. Section 11 78 13, MORTUARY REFRIGERATORS: Piping require

9、ments for freezers and refrigerators. F. Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION: General mechanical requirements and items, which are common to more than one section of Division 23. G. Section 23 07 11, HVAC, PLUMBING, and BOILER PLANT INSULATION: Requirements for piping

10、 insulation. H. Section 23 64 00, PACKAGED WATER CHILLERS: Piping requirements for air cooled chillers and condensing units. I. Section 23 21 13, HYDRONIC PIPING: Requirements for water and drain piping and valves. 1.3 QUALITY ASSURANCE A. Refer to specification Section 23 05 11, COMMON WORK RESULTS

11、 FOR HVAC and STEAM GENERATION. B. Comply with ASHRAE Standard 15, Safety Code for Mechanical Refrigeration. The application of this Code is intended to assure the safe design, construction, installation, operation, and inspection of every refrigerating system employing a fluid which normally is vap

12、orized and liquefied in its refrigerating cycle. C. Comply with ASME B31.5: Refrigerant Piping and Heat Transfer Components. D. Products shall comply with UL 207 “RefrigerantContaining Components and Accessories, “Nonelectrical“; or UL 429 “Electrical Operated Valves.“ 1.4 SUBMITTALS A. Submit in ac

13、cordance with specification Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Shop Drawings: 1. Complete information for components noted, including valves and refrigerant piping accessories, clearly presented, shall be included to determine compliance with drawings and specifications f

14、or components noted below: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23 00-3 a. Tubing and fittings b. Valves c. Strainers d. Moisture-liquid indicators e. Filter-driers f. Flexible metal hose g. Liquid-suction interchanges h. Oil sepa

15、rators (when specified) i. Gages j. Pipe and equipment supports k. Refrigerant and oil l. Pipe/conduit roof penetration cover m. Soldering and brazing materials 2. Layout of refrigerant piping and accessories, including flow capacities, valves locations, and oil traps slopes of horizontal runs, floo

16、r/wall penetrations, and equipment connection details. C. Certification: Copies of certificates for welding procedure, performance qualification record and list of welders names and symbols. D. Design Manual: Furnish two copies of design manual of refrigerant valves and accessories. 1.5 APPLICABLE P

17、UBLICATIONS A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only. B. Air Conditioning, Heating, and Refrigeration Institute (ARI/AHRI): 495-1999 (R2002) . Standard for Refrigerant Liquid

18、 Receivers 730-2005 . Flow Capacity Rating of Suction-Line Filters and Suction-Line Filter-Driers 750-2007 . Thermostatic Refrigerant Expansion Valves 760-2007 . Performance Rating of Solenoid Valves for Use with Volatile Refrigerants C. American Society of Heating Refrigerating and Air Conditioning

19、 Engineers (ASHRAE): ANSI/ASHRAE 15-2007 Safety Standard for Refrigeration Systems (ANSI) ANSI/ASHRAE 17-2008 Method of Testing Capacity of Thermostatic Refrigerant Expansion Valves (ANSI) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23 0

20、0-4 63.1-95 (RA 01) Method of Testing Liquid Line Refrigerant Driers (ANSI) D. American National Standards Institute (ANSI): ASME (ANSI)A13.1-2007 Scheme for Identification of Piping Systems Z535.1-2006 Safety Color Code E. American Society of Mechanical Engineers (ASME): ANSI/ASME B16.22-2001 (R200

21、5) Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings (ANSI) ANSI/ASME B16.24-2006 Cast Copper Alloy Pipe Flanges and Flanged Fittings, Class 150, 300, 400, 600, 900, 1500 and 2500 (ANSI) ANSI/ASME B31.5-2006 . Refrigeration Piping and Heat Transfer Components (ANSI) ANSI/ASME B40.100-20

22、05 . Pressure Gauges and Gauge Attachments ANSI/ASME B40.200-2008 . Thermometers, Direct Reading and Remote Reading F. American Society for Testing and Materials (ASTM) A126-04 Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe FittingsB32-08Standard Specification for Solder

23、 Metal B88-03 . Standard Specification for Seamless Copper Water Tube B88M-05 Standard Specification for Seamless Copper Water Tube (Metric) B280-08 Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service G. American Welding Society, Inc. (AWS): Brazing H

24、andbook A5.8/A5.8M-04 Standard Specification for Filler Metals for Brazing and Braze Welding H. Federal Specifications (Fed. Spec.) Fed. Spec. GG I. Underwriters Laboratories (U.L.): U.L.207-2009 . Standard for Refrigerant-Containing Components and Accessories, Nonelectrical U.L.429-99 (Rev.2006) St

25、andard for Electrically Operated Valves Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23 00-5 PART 2 - PRODUCTS SPEC WRITER NOTE: Make material requirements agree with applicable requirements specified in the referred publications. Update

26、and specify only that material which applies to the project. 2.1 PIPING AND FITTINGS SPEC WRITER NOTE: Copper tubing is limited to sizes up to DN 100 (NPS 4). A. Refrigerant Piping: For piping up to 100 mm (4 inch) use Copper refrigerant tube, ASTM B280, cleaned, dehydrated and sealed, marked ACR on

27、 hard temper straight lengths. Coils shall be tagged ASTM B280 by the manufacturer. For piping over 100 mm (4 inch) use A53 Black SML steel. B. Water and Drain Piping: Copper water tube, ASTM B88M, Type B or C (ASTM B88, Type M or L). Optional drain piping material: Schedule 80 flame retardant Polyp

28、ropylene plastic. C. Fittings, Valves and Accessories: 1. Copper fittings: Wrought copper fittings, ASME B16.22. a. Brazed Joints, refrigerant tubing: Cadmium free, AWS A5.8/A5.8M, 45 percent silver brazing alloy, Class BAg-5. b. Solder Joints, water and drain: 95-5 tin-antimony, ASTM B32 (95TA). 2.

29、 Steel fittings: ASTM wrought steel fittings. a. Refrigerant piping Welded Joints. 3. Flanges and flanged fittings: ASME B16.24. 4. Refrigeration Valves: a. Stop Valves: Brass or bronze alloy, packless, or packed type with gas tight cap, frost proof, back seating. b. Pressure Relief Valves: Comply w

30、ith ASME Boiler and Pressure Vessel Code; UL listed. Forged brass with nonferrous, corrosion resistant internal working parts of high strength, cast iron bodies conforming to ASTM A126, Grade B. Set valves in accordance with ASHRAE Standard 15. c. Solenoid Valves: Comply with ARI 760 and UL 429, UL-

31、listed, two-position, direct acting or pilot-operated, moisture and vapor-proof type of corrosion resisting materials, designed for intended service, and solder-end connections. Fitted with Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23

32、00-6 suitable NEMA 250 enclosure of type required by location and normally / open / closed / holding coil. d. Thermostatic Expansion Valves: Comply with ARI 750. Brass body with stainless-steel or non-corrosive non ferrous internal parts, diaphragm and spring-loaded (direct-operated) type with sensi

33、ng bulb and distributor having side connection for hot-gas bypass and external equalizer. Size and operating characteristics as recommended by manufacturer of evaporator and factory set for superheat requirements. Solder-end connections. Testing and rating in accordance with ASHRAE Standard 17. e. C

34、heck Valves: Brass or bronze alloy with swing or lift type, with tight closing resilient seals for silent operation; designed for low pressure drop, and with solder-end connections. Direction of flow shall be legibly and permanently indicated on the valve body. 5. Strainers: Designed to permit remov

35、ing screen without removing strainer from piping system, and provided with screens 80 to 100 mesh in liquid lines DN 25 (NPS 1) and smaller, 60 mesh in liquid lines larger than DN 25 (NPS 1), and 40 mesh in suction lines. Provide strainers in liquid line serving each thermostatic expansion valve, an

36、d in suction line serving each refrigerant compressor not equipped with integral strainer. 6. Refrigerant Moisture/Liquid Indicators: Double-ported type having heavy sight glasses sealed into forged bronze body and incorporating means of indicating refrigerant charge and moisture indication. Provide

37、 screwed brass seal caps. 7. Refrigerant Filter-Dryers: UL listed, angle or in-line type, as shown on drawings. Conform to ARI Standard 730 and ASHRAE Standard 63.1. Heavy gage steel shell protected with corrosion-resistant paint; perforated baffle plates to prevent desiccant bypass. Size as recomme

38、nded by manufacturer for service and capacity of system with connection not less than the line size in which installed. Filter driers with replaceable filters shall be furnished with one spare element of each type and size. 8. Flexible Metal Hose: Seamless bronze corrugated hose, covered with bronze

39、 wire braid, with standard copper tube ends. Provide in suction and discharge piping of each compressor. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 23 00-7 SPEC WRITER NOTE: Discuss the use of heat exchanger with the VA. 9. Water Piping

40、 Valves and Accessories: Refer to specification Section 23 21 13, HYDRONIC PIPING. SPEC WRITER NOTE: Oil separators are required only in special situations. These may include systems with long suction lines or other oil return issues. Confirm application of oil separators with equipment manufacturer

41、. /10. Oil Separators: Provide for condensing units, as shown. All welded steel construction with capacity to eliminate a minimum of 95 percent of the oil from the hot gas flowing through it. Provide manufacturers published ratings for minimum and maximum refrigeration tonnage corresponding to this

42、oil separating efficiency. Separator shall be equipped with a float valve to prevent return of the hot gas to crankcase, and shall have isolating stop valves so it can be opened and services without pumping out any other part of the system. ASME construction or UL listed. SPEC WRITER NOTE: Required

43、only to accommodate pump-down charge. /11. Receivers: Conform to AHRI 495, steel construction, equipped with tappings for liquid inlet and outlet valves, pressure relief valve and liquid level indicator./ 2.2 GAGES A. Temperature Gages: Comply with ASME B40.200. Industrial-duty type and in required

44、temperature range for service in which installed. Gages shall have Celsius scale in 1-degree (Fahrenheit scale in 2-degree) graduations and with black number on a white face. The pointer shall be adjustable. Rigid stem type temperature gages shall be provided in thermal wells located within 1525 mm

45、(5 feet) of the finished floor. Universal adjustable angle type or remote element type temperature gages shall be provided in thermal wells located 1525 to 2135 mm (5 to 7 feet) above the finished floor. Remote element type temperature gages shall be provided in thermal wells located 2135 mm (7 feet

46、) above the finished floor. B. Vacuum and Pressure Gages: Comply with ASME B40.100 and provide with throttling type needle valve or a pulsation dampener and shut-off valve. Gage shall be a minimum of 90 mm (3-1/2 inches) in diameter with Provided by IHSNot for ResaleNo reproduction or networking per

47、mitted without license from IHS-,-,-02-10 23 23 00-8 a range from 0 kPa (0 psig) to approximately 1.5 times the maximum system working pressure. Each gage range shall be selected so that at normal operating pressure, the needle is within the middle-third of the range. 1. Suction: 101 kPa (30 inches

48、Hg) vacuum to 1723 kPa (gage) (250 psig). 2. Discharge: 0 to 3445 kPa (gage) (0 to 500 psig). 2.3 THERMOMETERS AND WELLS A. Refer to specification Section 23 21 13, HYDRONIC PIPING. 2.4 PIPE SUPPORTS A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. 2.5 E

49、LECTRICAL HEAT TRACING SYSTEM A. Refer to specification Section 23 21 13, HYDRONIC PIPING. Provide for freezer unit cooler drain piping. 2.6 REFRIGERANTS AND OIL A. Provide EPA approved refrigerant and oil for proper system operation. 2.7 PIPE/CONDUIT ROOF PENETRATION COVER A. Prefabricated Roof Curb: Galvanized steel or extruded aluminum 300 mm (12 inches) overal