SECTION 15535

REFRIGERATION PIPING AND SPECIALTIES

PART 1 GENERAL

SECTION INCLUDES

Piping.

Refrigerant.

Moisture and liquid indicators.

Valves.

Strainers.

Check valves.

Pressure relief valves.

Filter-driers.

Solenoid valves.

Expansion valves.

Receivers.

Flexible connections.

RELATED SECTIONS

Section 08305 - Access Doors.

Section 09900 - Painting.

Section 15260 - Piping Insulation.

Section 15280 - Equipment Insulation.

Section 15623 - Forced Air Furnaces.

Section 15658 - Reciprocating Compressor.

Section 15671 - Air Cooled Condensing Units.

Section 15742 - Air Cooled Refrigerant Condensers.

Section 15784 - Unit Air Conditioners.

Section 15785 - Computer Room Air Conditioning Units.

Section 15790 - Air Coils.

Section 15952 - Controls and Instrumentation.

Section 16180 - Equipment Wiring Systems.

REFERENCES

ANSI/ARI 495 - Refrigerant Liquid Receivers.

ANSI/ARI 710 - Liquid Line Dryers.

ANSI/ASHRAE 15 - Safety Code for Mechanical Refrigeration.

ANSI/ASHRAE 34 - Number Designation of Refrigerants.

ANSI/ASME SEC 8D - Boilers and Pressure Vessels Code, Rules for Construction of Pressure Vessels.

ANSI/ASME SEC 9 - Boilers and Pressure Vessels Code, Welding and Brazing Qualifications.

ANSI/ASME B16.22 - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.

ANSI/ASME B16.26 - Cast Copper Alloy Fittings For Flared Copper Tubes.

ANSI/ASME B31.5 - Refrigeration Piping.

ANSI/ASME B31.9 - Building Services Piping.

ANSI/ASTM B32 - Solder Metal.

ANSI/ASTM B88 - Seamless Copper Water Tube.

ANSI/AWS A5.8 - Brazing Filler Metal.

ANSI/AWS D1.1 - Structural Welding Code, Steel.

ANSI/UL 429 - Electrically Operated Valves.

ARI 750 - Thermostatic Refrigerant Expansion Valves.

ARI 760 - Solenoid Valves for Use With Volatile Refrigerants.

ASTM A53 - Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.

ASTM A120 - Pipe, Steel, Black and Hot-Dipped, Zinc-Coated (Galvanized), Welded and Seamless, for Ordinary Uses.

ASTM A234 - Pipe Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures.

ASTM B280 - Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.

MIL-I-631C - (Construction at Solenoid Valve Coils)

MIL-V-23450C - Valves, Expansion, Thermostatic, Refrigerant 12 and Refrigerant 22.

SUBMITTALS

Submit shop drawings under provisions of Section [01300.] [01340.]

Submit shop drawings indicating schematic layout of system, including equipment, critical dimensions, and sizes.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating general assembly of specialties, including manufacturers catalogue information.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

Submit welders certification of compliance with [ANSI/ASME Sec 9.] [ANSI/AWS D1.1.]

Submit design data as a submittal under provisions of Section [01300.] [01340.]

Submit data indicating pipe sizing.

Submit test reports under provisions of Section [01400.] [01405.]

Submit Test reports indicating results of leak test, acid test.

PROJECT RECORD DOCUMENTS

Submit documents under provisions of Section [01700.] [01720.]

Accurately record exact locations of equipment and refrigeration accessories on record drawings.

REGULATORY REQUIREMENTS

Conform to ANSI/ASME B31.9.

Welding Materials and Procedures: Conform to ANSI/ASME SEC 9[.] [and applicable state labor regulations.]

Welders Certification: In accordance with [ANSI/ASME SEC 9.] [ANSI/AWS D1.1.] [____________________.]

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section

[01600.] [01610.]

Deliver and store piping and specialties in shipping containers with labelling in place.

Store and protect products under provisions of Section [01600.] [01620.]

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

PART 2 PRODUCTS

PIPING

Copper Tubing: ASTM B280, Type ACR hard drawn [or annealed].

Fittings: ANSI/ASME B16.22 wrought copper.

Joints: [ANSI/ASTM B32, solder Grade 95TA.] [ANSI/AWS A5.8 BCup silver braze.]

Copper Tubing to 7/8 inch (22mm) OD: ANSI/ASTM B88, Type K, annealed.

Fittings: ANSI/ASME B16.26 cast copper.

Joints: Flared.

Steel Pipe: ASTM A53 or A120, Schedule 40, [0.365 inch (10 mm) wall for sizes 12 inch (300 mm) and over,] black.

Fittings: ASTM A234, forged steel welding type.

Joints: ANSI/AWS D1.1, welded.

REFRIGERANT

Refrigerant: ANSI/ASHRAE 34; [R-12: Dichlorodifluoromethane.] [R-21: Dichloromonofluoromethane.] [R-22 : Monochlorodifluoromethane.] [R30: Dichloromethane (Methylene Chloride).] [R-290: Propane.] [R-500: 73.8% Dichlorodifluoromethane and 26.2% Ethylidene Fluoride.] [R-600: Butane.] [R-717: Ammonia.] [R-744: Carbon Dioxide.] [R-764: Sulphur Dioxide.]

MANUFACTURERS

[___________________________________.]

[___________________________________.]

[___________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MOISTURE AND LIQUID INDICATORS

Indicators: [Single] [Double] port type, UL listed, with copper or brass body, flared or solder ends, sight glass, color coded paper moisture indicator [with removable element cartridge] and plastic cap; for maximum working pressure of [500] [460] [430] psi ([3450] [3170] [2960] kPa), and maximum temperature of 200 degrees F (93 degrees C).

VALVES

Diaphragm Packless Valves: UL listed, globe or angle pattern, forged brass body and bonnet, phosphor bronze and stainless steel diaphragms, rising stem and handwheel, stainless steel spring, nylon seat disc, solder or flared ends, with positive backseating; for maximum working pressure of 500 psi (3450 kPa) and maximum temperature of 275 degrees F (135 degrees C).

Packed Angle Valves: Forged brass [or nickel plated forged steel], forged brass seal caps with copper gasket, rising stem and seat [with backseating], molded stem packing, solder or flared ends; for maximum working pressure of 500 psi (3450 kPa) and maximum temperature of 275 degrees F (135 degrees C).

Packed Ball Valves: Two piece [bolted] forged brass Body with teflon ball seals and copper tube extensions, brass [bonnet and] seal cap, chrome plated ball, stem with neoprene ring stem seals; for maximum working pressure of 500 psi (3450 kPa) and maximum temperature of [300] [325] degrees F ([149] [163] degrees C).

STRAINERS

Straight Line or Angle Line Type: Brass or steel shell, steel cap and flange, and replaceable cartridge, with screen of stainless steel wire or monel reinforced with brass; for maximum working pressure of 430 psi (2960 kPa).

Straight Line, Non-Cleanable Type: Steel shell, copper plated fittings, stainless steel wire screen, for maximum working pressure of [_____] psi ([_____] kPa).

CHECK VALVES

Globe Type: Cast bronze or forged brass body, forged brass cap with neoprene seal, brass guide and disc holder, phosphor-bronze or stainless steel spring, teflon seat disc; for maximum working pressure of [425] [450] [500] psi ([2930] [3100] [3450] kPa) and maximum temperature of 300 degrees F (149 degrees C).

Straight Thru Type: Brass body and disc, phosphor-bronze or stainless steel spring, neoprene seat; for maximum working pressure of 500 psi (3450 kPa) and maximum temperature of [200] [250] degrees F ([93] [121] degrees C).

PRESSURE RELIEF VALVES

Straight Thru or Angle Type: Brass body and disc, neoprene seat, factory sealed and stamped with ASME UV and National Board Certification NB; for standard [235] [300] [350] [400] [425] [450] psi ([1620] [2070] [2410] [2760] [2930] [3100] kPa) setting; selected to ANSI/ASHRAE 15.

FILTER-DRIERS

Replaceable Cartridge Angle Type: ANSI/ARI 710, UL listed, brass shell and bronze cap, perforated brass shell and molded desiccant filter core; for maximum working pressure of 350 psi (2410 kPa).

Permanent Straight Thru Type: ANSI/ARI 710, UL listed, steel shell with molded desiccant filter core, for maximum working pressure of [350] [400] [500] psi ([2410] [2760] [3450] kPa).

SOLENOID VALVES

Valve: ARI 760, pilot operated, copper or brass [or steel] body and internal parts, synthetic seat, stainless steel stem and plunger assembly, with flared, solder, or threaded ends; for maximum working pressure of [500] [450] psi ([3450] [3100] kPa). Stem shall permit manual operation in case of coil failure.

Coil Assembly: UL listed, replaceable with molded electomagnetic coil, moisture and fungus proof, with surge protector and color coded lead wires, integral junction box [with pilot light] [; MIL-I-631C.] [; ANSI/UL 429.]

EXPANSION VALVES

Angle or Straight Thru Type: [ARI 750;] [MIL-I-23450C;] design suitable for refrigerant, brass body, internal or external equalizer, [bleed hole,] [adjustable] [non-adjustable] superheat setting, replaceable inlet strainer, with [non-replaceable] [replaceable] capillary tube and remote sensing bulb [and remote bulb well.]

Selection: Evaluate refrigerant pressure drop through system to determine available pressure drop across valve. Select valve for maximum load at design operating pressure and minimum 10 degrees F (6 degrees C) superheat. Select to avoid being undersized at full load and excessively oversized at part load.

RECEIVERS

Internal Diameter 6 inch (150 mm) and Smaller: ANSI/ARI 495, UL listed, steel, brazed; [400] [___] psi ([2760] [____] kPa) maximum pressure rating, with tappings for inlet, outlet, and pressure relief valve.

Internal Diameter Over 6 inch (150 mm): ANSI/ARI 495, welded steel, tested and stamped in accordance with Section 8D of the ANSI/ASME Boiler and Pressure Vessels Code; [400] [___] psi ([2760] [____] kPa) with tappings for inlet, outlet and pressure relief valve.

FLEXIBLE CONNECTORS

Corrugated [stainless steel] [bronze] hose with single layer of [stainless steel] exterior braiding, minimum 9 inches (230 mm) long with copper tube ends; for maximum working pressure [500] [400] 350] [300] psi ([3450] [2760] [2410] [2070] kPa).

PART 3 EXECUTION

PREPARATION

Ream pipe and tube ends.	Remove burrs. [Bevel plain end ferrous pipe.]

Remove scale and dirt on inside and outside before assembly.

Prepare piping connections to equipment with flanges or unions.

INSTALLATION

Install refrigeration specialties in accordance with manufacturer's instructions.

Route piping in orderly manner, with plumbing parallel to building structure, and maintain gradient.

Install piping to conserve building space and not interfere with use of space.

Group piping whenever practical at common elevations and locations. Slope piping one percent in direction of oil return.

Provide non-conducting dielectric connections when joining dissimilar metals.

Install piping to allow for expansion and contraction without stressing pipe, joints, or connected equipment.

Provide clearance for installation of insulation and access to valves and fittings.

Provide access to concealed valves and fittings. [Coordinate size and location of access doors with Section 08305.]

Where pipe support members are welded to structural building frame, brush clean, and apply one coat of zinc rich primer to welding.

Prepare pipe, fittings, supports, and accessories not prefinished, ready for finish painting. Refer to Section 09900.

Insulate piping [and equipment]; refer to Section 15260 [and 15280].

Locate expansion valve sensing bulb immediately downstream or evaporator on suction line.

Provide external equalizer piping on expansion valves with refrigerant distributor connected to evaporator.

Install flexible connectors at right angles to axial movement of compressor.

Fully charge completed system with refrigerant after testing.

Provide electrical connection to solenoid valves. Refer to Section 16180.

APPLICATION

Provide line size liquid indicators in main liquid line leaving condenser, or if receiver is provided, in liquid line leaving receiver.

Provide line size strainer upstream of each automatic valve. Where multiple expansion valves with integral strainers are used install single main liquid line strainer.

On steel piping systems, provide strainer in suction line.

Provide shut-off valve on each side of strainer.

Provide permanent filter-driers in [low temperature systems] [and] [systems utilizing hermetic compressors].

Provide replaceable cartridge filter-driers vertically in liquid line adjacent to receivers with three valve bypass assembly to permit isolation of driers for servicing.

Provide replaceable cartridge filter-driers, with three-valve bypass assembly. Provide filter-driers for each solenoid valve.

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

Provide refrigerant charging (packed angle) valve connections in liquid line between receiver shut-off valve and expansion valve.

Utilize flexible connectors at or near compressors where within piping configuration does not absorb vibration.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [01410.]

Test refrigeration system in accordance with ANSI/ASME B31.5.

Pressure test system with dry nitrogen to 200 psig (1470 kPa). [Perform final tests at 27 inches (92 kPa) vacuum and 200 psig (1470) kPa) using [halide torch] [electronic leak detector.]] Test to no leakage.

END OF SECTION