232300 REFRIGERANT PIPING seismic.pdf

UPGRADE EMERGENCY POWER IN BUILDING 138

VAMC, MARION, IN PROJECT: 610-16-104

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SECTION 23 23 00

REFRIGERANT PIPING

PART 1 - GENERAL

1.1 DESCRIPTION

A. Field refrigerant piping for direct expansion HV AC systems.

B. Refrigerant piping shall be sized, selected, and designed either by the equipment manufacturer or in strict accordance with the manufacturer’s published instructions. The schematic piping diagr am shall show all accessories such as, stop valves, level indicators, liquid receivers, oil separator, gauges, thermostatic expansion valve s, solenoid valves, moisture separators and driers to make a complete i nstallation.

C. Definitions:

1. Refrigerating system: Combination of interconnec ted refrigerant-containing parts constituting one close d refrigeration circuit in which a refrigerant is circulated for th e purpose of extracting heat.

a. Low side means the parts of a refrigerating syst em subjected to evaporator pressure.

b. High side means the parts of a refrigerating sys tem 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 tempera tures of the joined parts.

1.2 RELATED WORK

A. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, a nd SAMPLES.

E. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL

COMPONENTS.

B. Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

C. Section 23 07 11, HVAC, and BOILER PLANT INSULAT ION.

D. Section 23 21 13, HYDRONIC PIPING.

1.3 QUALITY ASSURANCE

A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

B. Comply with ASHRAE Standard 15, Safety Code for Mechanical

Refrigeration. The application of this Code is inte nded to assure the safe design, construction, installation, operation, and inspection of every refrigerating system employing a fluid which normally is vaporized and liquefied in its refrigerating cycle.

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C. Comply with ASME B31.5: Refrigerant Piping and H eat Transfer

Components.

D. Products shall comply with UL 207 "Refrigerant–C ontaining Components and Accessories, "Nonelectrical"; or UL 429 "Electr ical Operated

Valves."

1.4 SUBMITTALS

A. Submit in accordance with specification Section 01 33 23, SHOP

DRAWINGS, PRODUCT DATA, and SAMPLES.

B. Shop Drawings:

1. Complete information for components noted, inclu ding valves and refrigerant piping accessories, clearly presented, shall be included to determine compliance with drawings and specifica tions for components noted below:

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 separators (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, in cluding flow capacities, valves locations, and oil traps slopes of horizontal runs, floor/wall penetrations, and equipment connec tion details.

C. Certification: Copies of certificates for weldin g procedure, performance qualification record and list of welder s' names and symbols.

D. Design Manual: Furnish two copies of design manu al of refrigerant valves and accessories.

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of thi s specification to the extent referenced. The publications are referenced in the text by the basic designation only.

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B. Air Conditioning, Heating, and Refrigeration Ins titute (ARI/AHRI):

495-2005................Standard for Refrigerant Li quid Receivers

730-2013................Flow Capacity Rating of Suc tion-Line Filters and Suction-Line Filter-Driers

750-2016................Thermostatic Refrigerant Ex pansion Valves

760-2014................Performance Rating of Solen oid Valves for Use with Volatile Refrigerants

C. American Society of Heating Refrigerating and Ai r Conditioning

Engineers (ASHRAE):

15-2019.................Safety Standard for Refrige ration Systems

(ANSI)

17-2008.................Method of Testing Capacity of Thermostatic

Refrigerant Expansion Valves (ANSI)

63.1-2001...............Method of Testing Liquid Li ne Refrigerant

Driers (ANSI)

63.2-2010...............Method of Testing Liquid Li ne Filter Drier

Filtration Capability (ANSI)

D. American National Standards Institute (ANSI):

A13.1-2015Scheme for Identification of Piping Syste ms

Z535.1-2017.............Safety Color Code

E. American Society of Mechanical Engineers (ASME):

B16.22-2018 Wrought Copper and Copper Alloy Solder- Joint Pressure

Fittings (ANSI)

B16.24-2016Cast Copper Alloy Pipe Flanges and Flang ed Fittings, Class

150, 300, 400, 600, 900, 1500 and 2500 (ANSI)

B31.5-2013 Refrigeration Piping and Heat Transfer C omponents (ANSI)

B40.100-2013............Pressure Gauges and Gauge A ttachments

B40.200-2008............Thermometers, Direct Readin g and Remote Reading

F. American Society for Testing and Materials (ASTM )

A126-2014...............Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings

B32-08Standard Specification for Solder Metal

B88-2016................Standard Specification for Seamless Copper

Water Tube

B88M-2018...............Standard Specification for Seamless Copper

Water Tube (Metric)

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B280-2019...............Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field

Service

G. American Welding Society, Inc. (AWS):Brazing Han dbook

A5.8/A5.8M-2011.........Standard Specification for Filler Metals for

Brazing and Braze Welding

H. Underwriters Laboratories (U.L.):

U.L.207-2018............Standard for Refrigerant-Co ntaining Components and Accessories, Nonelectrical

U.L.429-2013............Standard for Electrically O perated Valves

PART 2 - PRODUCTS

2.1 PIPING AND FITTINGS

A. Refrigerant Piping: For piping up to 100 mm (4 i nch) use Copper refrigerant tube, ASTM B280, cleaned, dehydrated an d sealed, marked ACR on hard temper straight lengths. Coils shall be tag ged 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 Polypropylene plastic.

C. Fittings, Valves and Accessories:

1. Copper fittings: Wrought copper fittings, ASME B 16.22.

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-antimon y, ASTM B32

(95TA).

2. 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 with ASME Boiler and Pressure

Vessel Code; UL listed. Forged brass with nonferro us, 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-listed, two-position, direct acting or pilot-operated, moisture and

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23 23 00-5 vapor-proof type of corrosion resisting materials, designed for intended service, and solder-end connections. Fitte d with suitable NEMA 250 enclosure of type required by loc ation and normally open holding coil.

d. Thermostatic Expansion Valves: Comply with ARI 7 50. Brass body with stainless-steel or non-corrosive nonferrous in ternal parts, diaphragm and spring-loaded (direct-operated) type with sensing bulb and distributor having side connection for hot -gas bypass and external equalizer. Size and operating characte ristics as recommended by manufacturer of evaporator and facto ry set for superheat requirements. Solder-end connections. Tes ting and rating in accordance with ASHRAE Standard 17.

e. Check Valves: Brass or bronze alloy with swing o r 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 removing screen wi thout removing strainer from piping system, and provided with scre ens 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 suc tion lines.

Provide strainers in liquid line serving each therm ostatic expansion valve, and in suction line serving each refrigerant compressor not equipped with integral strainer.

6. Refrigerant Moisture/Liquid Indicators: Double-p orted type having heavy sight glasses sealed into forged bronze body and incorporating means of indicating refrigerant charge and moisture indication.

Provide screwed brass seal caps.

7. Refrigerant Filter-Dryers: UL listed, angle or i n-line type, as shown on drawings. Conform to ARI Standard 730 and ASHRAE Standard

63.1. Heavy gage steel shell protected with corrosi on-resistant paint; perforated baffle plates to prevent desiccan t bypass. Size as recommended by manufacturer for service and capacit y of system with connection not less than the line size in which ins talled. Filter driers with replaceable filters shall be furnished with one spare element of each type and size.

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8. Flexible Metal Hose: Seamless bronze corrugated hose, covered with bronze wire braid, with standard copper tube ends. Provide in suction and discharge piping of each compressor.

9. Oil Separators: Provide for condensing units, as shown. All welded steel construction with capacity to eliminate a min imum of 95 percent of the oil from the hot gas flowing through it. Provide manufacturer's published ratings for minimum and ma ximum refrigeration tonnage corresponding to this oil sep arating efficiency. Separator shall be equipped with a floa t valve to prevent return of the hot gas to crankcase, and sha ll have isolating stop valves so it can be opened and services withou t pumping out any other part of the system. ASME construction or UL l isted.

2.2 PIPE SUPPORTS

A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

2.3 REFRIGERANTS AND OIL

A. Provide EPA approved refrigerant and oil for pro per system operation.

2.4 PIPE INSULATION FOR DX HVAC SYSTEMS

Refer to specification Section 23 07 11, HVAC, PLU MBING, and BOILER

PLANT INSULATION.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install refrigerant piping and refrigerant conta ining parts in accordance with ASHRAE Standard 15 and ASME B31.5

1. Install piping as short as possible, with a mini mum number of joints, elbow and fittings.

2. Install piping with adequate clearance between p ipe and adjacent walls and hangers to allow for service and inspecti on. Space piping, including insulation, to provide 25 mm (1 inch) min imum clearance between adjacent piping or other surface. Use pipe sleeves through walls, floors, and ceilings, sized to permit instal lation of pipes with full thickness insulation.

3. Locate and orient valves to permit proper operat ion and access for maintenance of packing, seat and disc. Generally lo cate valve stems in overhead piping in horizontal position. Provide a union adjacent to one end of all threaded end valves. Control valv es usually require reducers to connect to pipe sizes shown on the drawing.

4. Use copper tubing in protective conduit when ins talled below ground.

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5. Install hangers and supports per ASME B31.5 and the refrigerant piping manufacturer's recommendations.

B. Joint Construction:

1. Brazed Joints: Comply with AWS "Brazing Handbook " and with filler materials complying with AWS A5.8/A5.8M.

a. Use Type BcuP, copper-phosphorus alloy for joini ng copper socket fittings with copper tubing.

b. Use Type BAg, cadmium-free silver alloy for join ing copper with bronze or steel.

c. Swab fittings and valves with manufacturer's rec ommended cleaning fluid to remove oil and other compounds prior to in stallation.

d. Pass nitrogen gas through the pipe or tubing to prevent oxidation as each joint is brazed. Cap the system with a reus able plug after each brazing operation to retain the nitrogen and prevent entrance of air and moisture.

C. Protect refrigerant system during construction a gainst entrance of foreign matter, dirt and moisture; have open ends o f piping and connections to compressors, condensers, evaporators and other equipment tightly capped until assembly.

D. Pipe relief valve discharge to outdoors for syst ems containing more than 45 kg (100 lbs) of refrigerant.

E. Firestopping: Fill openings around uninsulated p iping penetrating floors or fire walls, with firestop material. For f irestopping insulated piping refer to Section 23 07 11, HVAC, a nd BOILER PLANT

INSULATION.

F. Seismic Bracing: Refer to specification Section 13 05 41, SEISMIC

RESTRAINTS REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS, for bracing of piping in seismic areas.

3.2 PIPE AND TUBING INSULATION

A. Refer to specification Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

B. Apply two coats of weather-resistant finish as r ecommended by the manufacturer to insulation exposed to outdoor weath er.

3.3 SIGNS AND IDENTIFICATION

A. Each refrigerating system erected on the premise s shall be provided with an easily legible permanent sign securely atta ched and easily accessible, indicating thereon the name and address of the installer, the kind and total number of pounds of refrigerant required in the system for normal operations, and the field test pr essure applied.

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B. Systems containing more than 50 kg (110 lb) of r efrigerant shall be provided with durable signs, in accordance with ANS I A13.1 and ANSI

Z535.1, having letters not less than 13 mm (1/2 inc h) in height designating:

1. Valves and switches for controlling refrigerant flow, the ventilation and the refrigerant compressor(s).

2. Signs on all exposed high pressure and low press ure piping installed outside the machinery room, with name of the refrig erant and the letters "HP" or "LP."

3.4 FIELD QUALITY CONTROL

A. Prior to initial operation examine and inspect p iping system for conformance to plans and specifications and ASME B3 1.5. Correct equipment, material, or work rejected because of de fects or nonconformance with plans and specifications, and A NSI codes for pressure piping.

B. After completion of piping installation and prio r to initial operation, conduct test on piping system according to ASME B31 .5. Furnish materials and equipment required for tests. Perform tests in the presence of COR. If the test fails, correct defects and perform the test again until it is satisfactorily done and all joints are proved tight.

1. Every refrigerant-containing parts of the system that is erected on the premises, except compressors, condensers, evapo rators, safety devices, pressure gages, control mechanisms and sys tems that are factory tested, shall be tested and proved tight af ter complete installation, and before operation.

2. The high and low side of each system shall be te sted and proved tight at not less than the lower of the design pres sure or the setting of the pressure-relief device protecting th e high or low side of the system, respectively, except systems er ected on the premises using non-toxic and non-flammable Group A1 refrigerants with copper tubing not exceeding DN 18 (NPS 5/8). T his may be tested by means of the refrigerant charged into the system at the saturated vapor pressure of the refrigerant at 20 degrees C ( 68 degrees F) minimum.

C. Test Medium: A suitable dry gas such as nitrogen or shall be used for pressure testing. The means used to build up test p ressure shall have either a pressure-limiting device or pressure-reduc ing device with a

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23 23 00-9 pressure-relief device and a gage on the outlet sid e. The pressure relief device shall be set above the test pressure but low enough to prevent permanent deformation of the system compone nts.

3.5 SYSTEM TEST AND CHARGING

A. System Test and Charging: As recommended by the equipment manufacturer or as follows:

1. Connect a drum of refrigerant to charging connec tion and introduce enough refrigerant into system to raise the pressur e to 70 kPa (10 psi) gage. Close valves and disconnect refrigerant drum. Test system for leaks with halide test torch or other approved method suitable for the test gas used. Repair all leaking joints an d retest.

2. Connect a drum of dry nitrogen to charging valve and bring test pressure to design pressure for low side and for hi gh side. Test entire system again for leaks.

3. Evacuate the entire refrigerant system by the tr iplicate evacuation method with a vacuum pump equipped with an electron ic gage reading in mPa (microns). Pull the system down to 665 mPa (500 microns) 665 mPa (2245.6 inches of mercury at 60 degrees F) and hold for four hours then break the vacuum with dry nitrogen (or r efrigerant).

Repeat the evacuation two more times breaking the t hird vacuum with the refrigeration to be charged and charge with the proper volume of refrigerant.

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