SECTION 15183 - REFRIGERANT PIPING

1 October 15, 2001 CONSTRUCTION STANDARD SPECIFICATION SECTION 15183 REFRIGERANT SYSTEMS PART 1 - GENERAL Quality PART 2 - PRODUCTS Copper Tube And REFRIGERANT PIPING PART 3 - EXECUTION System Design PIPING Hangers And Anchors:..8 Brazed Joints:..9 Leak Testing Of Refrigeration PIPING Evacuation And Vibration Test And 15183 - 1 REFRIGERANT PIPING October 15, 2001 CONSTRUCTION STANDARD SPECIFICATION SECTION 15183 REFRIGERANT SYSTEMS PART 1 - GENERAL SUMMARY A.

2 Materials and operations required for the installation of built-up and packaged split system refrigeration systems, including PIPING , fittings, equipment, refrigeration ac-cessories, refrigerants, and lubricating oil, joints, testing, evacuation and charging, and vibration isolators. B. Recovery and reclamation of refrigerants from equipment that is to be removed or modified shall be by SNL personnel only. The contractor shall schedule such work through the Sandia Construction Observer (SCO). C. Related Sections: Refer the to following sections for related work; SECTION 01330, "Submittal Procedures SECTION 07270, Firestop and Smokestop Systems SECTION 09900, Painting SECTION 13943, Facilities Control Systems SECTION 15050, Basic Mechanical Materials and Methods SECTION 15083, Pipe and Equipment Insulation SECTION 15200, Vibration Limits and Control SECTION 15901, Systems Component Checkout and Balance REFERENCES The current editions of the following codes and standards are a part of this specification.

3 American Society of Mechanical Engineers Standards and American National Standards (ASME/ANSI): 15183 - 2 REFRIGERANT PIPING October 15, 2001 ANSI Wrought Copper and Copper Alloy Solder-joint Pressure Fit-tings ANSI Refrigeration PIPING ASME Sec. VIII Boiler and Pressure Vessel Code - Unfired Pressure Vessels American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE): ANSI/ASHRAE 15 Safety Code for Mechanical Refrigeration American Society for Testing and Materials (ASTM): ASTM B280 Seamless Copper Tube for Air Conditioning and Refrigeration Field Service American Welding Society (AWS): AWS Specification for Brazing Filler Metal SUBMITTALS A.

4 All required submittals shall be per SECTION 01330, "Submittal Procedures . B. Built-Up Systems: Product Data: Provide submittals for all PIPING materials, each type of valve and REFRIGERANT PIPING specialty indicated. C. Packaged Split Systems: REFRIGERANT PIPING indicated is schematic only. Provide the equipment manufacturer s Installation Manual including required PIPING schematic. Size PIPING and design the actual PIPING layout, including oil traps, double risers, specialties, slopes of runs, required controls, and pipe and tube sizes, to ensure proper operation and compliance with warranties of connected equipment.

5 QUALITY ASSURANCE ASHRAE Standard: Comply with ASHRAE 15, "Safety Code for Mechanical Refrigeration." ASME Standard: Comply with ASME , "Refrigeration PIPING ." PART 2 - PRODUCTS COPPER TUBE AND FITTINGS A. Drawn-Temper Copper Tube: ASTM B 280, Type ACR, clean, dry and capped. B. Annealed-Temper Copper Tube: ASTM B 280, Type ACR, clean, dry and capped. Annealed copper tubing shall not be used for PIPING larger than 15183 - 3 REFRIGERANT PIPING October 15, 2001 C. Wrought-Copper Fittings: ASME D. Bronze Filler Metals: AWS , Classification BAg-7 (50 % silver), BCuP5 (15% Silver) valves A.

6 Lines 1 or smaller: Diaphragm Packless valves : 500-psig working pressure and 275 deg F working temperature; globe design with straight-through or angle pattern; forged-brass or bronze body and bonnet, phosphor bronze and stainless-steel diaphragms, rising stem and hand-wheel, stainless-steel spring, nylon seat disc, with solder-end connections. B. Lines 1-1/8 or larger: Wing Cap Packed valves : 450-psig working pressure and 275 deg F working temperature; straight-through or angled, forged-brass or bronze body, forged-brass seal caps with copper gasket, back seating, rising stem and seat, molded stem packing, with solder-end connections.

7 C. Check valves Smaller Than NPS 1: 500-psig operating pressure and 285 deg F operating temperature; cast-brass body, with removable piston, polytetrafluoroethylene seat, and stainless-steel spring; globe design. Valve shall be straight-through pattern, with solder-end connections. D. Check valves , NPS 1 and Larger: 400-psig operating pressure and 285 deg F operating temperature; cast-bronze body, with cast-bronze or forged-brass bolted bonnet; floating piston with mechanically retained polytetrafluoroethylene seat disc. Valve shall be straight-through or angle pattern, with solder-end connections.

8 E. Service valves : 500-psig pressure rating; forged-brass body with copper stubs, brass caps, removable valve core, integral ball check valve, and with solder-end connections. F. Three-way dual shut-off valves for use with pressure relief valves . Henry Type 92. G. Solenoid valves : Comply with ARI 760; 250 deg F temperature rating and 400-psig working pressure; forged brass, with polytetrafluoroethylene valve seat, 2-way, straight-through pattern, and solder-end connections; manual operator; fitted with suitable NEMA 250 enclosure of type required by location, with 1/2-inch conduit adapter, and voltage and normal holding coil position as indicated on the drawings.

9 H. Pressure Relief valves : Straight-through or angle pattern, brass body and disc, neoprene seat, and factory sealed and ASME labeled for standard pressure setting. valves shall be factory set to maintain an operating or standby pressure per ASHRAE 15 and not to exceed the receiver design pressure or pressure of the lowest rated PIPING component in the system. 15183 - 4 REFRIGERANT PIPING October 15, 2001 I. Thermostatic Expansion valves : Comply with ARI 750; brass body with stainless-steel parts; thermostatic-adjustable, modulating type; size and operating characteristics as recommended by manufacturer of evaporator, and factory set for superheat requirements; solder-end connections; with sensing bulb, distributor having side connection for hot-gas bypass line, and external equalizer line.

10 J. Capillary tubes are only allowed in packaged units, less than 10 tons. K. Hot-Gas Bypass Valve: Pulsating-dampening design, stainless-steel bellows and polytetrafluoroethylene valve seat; adjustable; sized for capacity equal to last step of compressor unloading; with solder-end connections. REFRIGERANT PIPING SPECIALITIES A. Straight- or Angle-Type Strainers: 350-psig working pressure; forged-brass or steel body with stainless-steel wire or brass-reinforced Monel screen of 80 to 100 mesh in liquid lines up to 1-1/8 inches, 60 mesh in larger liquid lines, and 40 mesh in suction lines; with screwed cleanout plug and solder-end connections.