Loading...
HomeMy WebLinkAbout232300 REFRIGERANT PIPING AND SPECIALTIESTHE KENT 23 23 00 - 1 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT SECTION 23 23 00 - REFRIGERANT PIPING AND SPECIALTIES PART 1 - GENERAL 1.01 RELATED SECTIONS: A. Drawings, general provisions of the Contract, including General and Supplementary Conditions, and Division-1 Specification Sections and Division 20, 23 and 28 Specification Sections, apply to work of this Section. 1.02 SUMMARY: A. This Section includes refrigerant piping used for air conditioning applications. This Section includes: 1. Pipes, tubing, fittings, and specialties. 2. Special duty valves. 3. Refrigerants. B. Products installed but not furnished under this Section include pre-charged tubing, refrigerant specialties, and refrigerant accessories furnished as an integral part of or separately with packaged air conditioning equipment. 1.03 SUBMITTALS: A. Product data for the following products: 1. Piping, tubing, and fittings. 2. Each type valve specified. 3. Each type refrigerant piping specialty specified. B. Shop Drawings showing layout of refrigerant piping, specialties, and fittings including, but not necessarily limited to, pipe and tube sizes, valve arrangements and locations, slopes of horizontal runs, wall and floor penetrations, and equipment connection details. Show interface and spatial relationship between piping and proximate to equipment. 1.04 QUALITY ASSURANCE: A. Qualify brazing processes and brazing operators in accordance with ASME "Boiler and Pressure Vessel Code," Section IX, "Welding and Brazing Qualifications". B. Regulatory Requirements: Comply with provisions of the following codes: 1. ANSI B31.5: ASME Code for Pressure Piping - Refrigerant Piping. 2. ANSI/ASHRAE Standard 15: Safety Code for Mechanical Refrigeration. 3. International Mechanical Code with Indiana Amendments. THE KENT 23 23 00 - 2 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT 1.05 SEQUENCING AND SCHEDULING: A. Coordinate the installation of roof piping supports, and roof penetrations. Roof specialties are specified in Division 07. PART 2 - PRODUCTS 2.01 MANUFACTURERS: A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products which may be incorporated in the Work include, but are not limited to, the following. B. Refrigerant Valves and Specialties: 1. Alco Controls Div, Emerson Electric. 2. Danfoss Electronics, Inc. 3. EATON Corporation, Control Div. 4. Henry Valve Company. 5. Parker-Hannifin Corporation, Refrigeration and Air Conditioning Division. 6. Sporlan Valve Company. 2.02 PIPE AND TUBING MATERIALS: A. General: Refer to Part 3, Article "PIPE APPLICATION" for identification of systems where the below specified pipe and fitting materials are used. B. Copper Tubing: ASTM B 280, Type ACR, hard-drawn straight lengths, and soft-annealed coils, seamless copper tubing. Tubing shall be factory cleaned, ready for installation, and have ends capped to protect cleanliness of pipe interiors prior to shipping. 2.03 FITTINGS: A. Wrought-Copper Fittings: ANSI B16.22, streamlined pattern. 2.04 JOINING MATERIALS: A. Brazing Filler Metals: AWS A5.8, Classification BAg-1 (Silver). 2.05 VALVES: A. General: Complete valve assembly shall be UL-listed and designed to conform to ARI 760. B. Globe: 450 psig maximum operating pressure, 275 deg. F maximum operating temperature; cast bronze body, with cast bronze or forged brass wing cap and bolted bonnet; replaceable resilient seat disc; plated steel stem. Valve shall be capable of being repacked under pressure. Valve shall be straight through or angle pattern, with solder-end connections. C. Check Valves - Smaller Than 7/8 inch: 500 psig maximum operating pressure, 300 deg. F maximum operating temperature; cast brass body, with removable piston, Teflon seat, and stainless steel spring; straight through globe design. Valve shall be straight through pattern, with solder-end connections. THE KENT 23 23 00 - 3 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT D. Check Valves - 7/8 inch and Larger: 450 psig maximum operating pressure, 300 deg. F maximum operating temperature; cast bronze body, with cast bronze or forged brass bolted bonnet; floating piston with mechanically retained Teflon seat disc. Valve shall be straight through or angle pattern, with solder-end connections. E. Solenoid Valves: 250 deg. F temperature rating, 400 psig working pressure; forged brass, with Teflon valve seat, two-way straight through pattern, and solder end connections. Provide manual operator to open valve. Furnish complete with NEMA 1 solenoid enclosure with 1/2 inch conduit adapter, and 24 volt, 60 Hz. normally closed holding coil. F. Evaporator Pressure Regulating Valves: Pilot-operated, forged brass or cast bronze; complete with pilot operator, stainless steel bottom spring, pressure gage tappings, 24 volts DC, 50/60 Hz, standard coil; and wrought copper fittings for solder end connections. G. Thermal Expansion Valves: Thermostatic adjustable, modulating type; size as required for specific evaporator requirements, and factory set for proper evaporator superheat requirements. Valves shall have copper fittings for solder end connections; complete with sensing bulb, a distributor having a side connection for hot gas bypass line, and an external equalizer line. H. Hot Gas Bypass Valve: Adjustable type, sized to provide capacity reduction beyond the last step of compressor unloading; and wrought copper fittings for solder end connections. 2.06 REFRIGERANT PIPING SPECIALTIES: A. General: Complete refrigerant piping specialty assembly shall be UL-listed and designed to conform to ARI 760. B. Strainers: 500 psig maximum working pressure; forged brass body with monel 80-mesh screen, and screwed cleanout plug; Y-pattern, with solder end connections. C. Moisture/liquid Indicators: 500 psig maximum operation pressure, 200 deg. F maximum operating temperature; forged brass body, with replaceable polished optical viewing window, and solder end connections. D. Permanent Filter-Drier: 350 psig maximum operation pressure, 225 deg. F maximum operating temperature; steel shell, and wrought copper fittings for solder end connections. Permanent filter element shall be molded felt core surrounded by a desiccant. for removal of acids and moisture for refrigerant vapor. E. Replaceable Core Filter-Drier: 500 psig maximum operation pressure; steel shell, flange ring, and spring, ductile iron cover plate with steel capscrews, and wrought copper fittings for solder end connections. Furnish complete with replaceable filter core kit, including gaskets, as follows: 1. Standard capacity desiccant sieves to provide micronic filtration, ARI 730 rated for capacity. F. Flanged Unions: 400 psig maximum working pressure, 330 deg. F maximum operating temperature; two brass tailpiece adapters for solder end connections to copper tubing; flanges for 7/8 inch through 1-5/8 inch unions shall be forged steel, and for 2-1/8 inch through 3-1/8 inch shall be ductile iron; four plated steel bolts, with silicon bronze nuts and fiber gasket. THE KENT 23 23 00 - 4 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT Flanges and bolts shall have factory-applied rust-resistant coating. G. Flexible Connectors: 500 psig maximum operating pressure; seamless tin bronze or stainless steel core, high tensile bronze braid covering, solder connections, and synthetic covering; dehydrated, pressure tested, minimum 7 inch in length. 2.07 REFRIGERANT: A. Refrigerant R-410, in accordance with ASHRAE Standard 34. PART 3 - EXECUTION 3.01 EXAMINATION: A. Examine rough-in for refrigerant piping systems to verify actual locations of piping connections prior to installation. 3.02 PIPE APPLICATIONS: A. Use Type K, or Type ACR drawn copper tubing with wrought copper fittings and brazed joints above ground, within building. Use Type K, annealed temper copper tubing for 2 inch and smaller without joints, below ground and within slabs. Mechanical fittings (crimp or flair) are not permitted. B. If other than Type ACR tubing is used, clean and protect inside of tubing as specified in Article "CLEANING" below. 3.03 PIPING INSTALLATIONS: A. General: Install refrigerant piping in accordance with ASHRAE Standard 15 - "The Safety Code for Mechanical Refrigeration." B. Arrange piping to allow normal inspection and servicing of compressor and other equipment. Install valves and specialties in accessible locations to allow for servicing and inspection. C. Provide adequate clearance between pipe and adjacent walls and hanger, or between pipes for insulation installation. Use sleeves through floors, walls, or ceilings, sized to permit installation of full thickness insulation. D. Insulate suction lines. Liquid line are not required to be insulated, except where they are installed adjacent and clamped to suction lines, where both liquid and suction lines shall be insulated as a unit. 1. Do not install insulation until system testing has been completed and all leaks have been eliminated. E. Install branch tie-in lines to parallel compressors equal length, and pipe identically and symmetrically. F. Install copper tubing in rigid or flexible conduit in locations where copper tubing will be exposed to mechanical injury. THE KENT 23 23 00 - 5 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT G. Install exposed piping at right angles or parallel to building walls. Diagonal runs are not permitted, unless expressly indicated. H. Exterior Wall Penetrations: Seal pipe penetrations through exterior walls using sleeves and mechanical sleeve seals. Pipe sleeves smaller than 6 inch shall be steel; pipe sleeves 6 inch and larger shall be sheet metal. I. Fire Barrier Penetrations: Where pipes pass through fire rated walls, partitions, ceilings, and floors, maintain the fire rated integrity. Refer to Division 7 for special sealers and materials. J. Roof Penetrations: Pipes shall penetrate roof through a pipe curb assembly like Pate, (insulated) with thermoplastic cover, sleeves scored for pipe sizes, graduated water-tight boots, and steel clamps. Roof warranty must be maintained. K. Install moisture/liquid indicators in liquid lines between filter/dryers and thermostatic expansion valves and in liquid line to receiver. 1. Install moisture/liquid indicators in lines larger than 2-1/8 inch OD, using a bypass line. L. Install unions to allow removal of solenoid valves, pressure regulating valves, expansion valves, and at connections to compressors and evaporators. 3.04 HANGERS AND SUPPORTS: A. General: Hangers, supports, and anchors are specified in Section 20 01 40 "SUPPORTS AND ANCHORS." Conform to the table below for maximum spacing of supports: B. Install hangers with the following minimum rod sizes and maximum spacing: COPPER STEEL PIPE SIZE SPACING ROD SIZE SPACING ROD SIZE 1/2 5’ 3/8 5/8 5’ 3/8 1 6’ 3/8 1-1/4 8’ 3/8 1-1/2 8’ 3/8 2 8’ 3/8 10’ 3/8 2-1/2 9’ 3/8 11’ 3/8 3 10’ 3/8 12’ 3/8 4 12 1/2 14’ 1/2 Support vertical runs at each floor 3.05 PIPE JOINT CONSTRUCTION: A. Brazed Joints: Comply with the procedures contained in the AWS "Brazing Manual." 1. WARNING: Some filler metals contain compounds which produce highly toxic fumes when heated. Avoid breathing fumes. Provide adequate ventilation. THE KENT 23 23 00 - 6 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT 2. CAUTION: When solenoid valves are being installed, remove the coil to prevent damage. When sight glasses are being installed, remove the glass. Remove stems, seats, and packing of valves, and accessible internal parts of refrigerant specialties before brazing. Do not apply heat near the bulb of the expansion valve. B. Fill the pipe and fittings during brazing, with an inert gas (ie., nitrogen or carbon dioxide) to prevent formation of scale. C. Heat joints using oxy-acetylene torch. Heat to proper and uniform brazing temperature. 3.06 VALVE INSTALLATIONS: A. General: Install refrigerant valves where indicated, and in accordance with manufacturer's instructions. B. Install globe valves on each side of strainers and dryers, in liquid and suction lines at evaporators, and elsewhere as indicated. C. Install a full sized, 3-valve bypass around each drier. D. Install solenoid valves ahead of each expansion valve and hot-gas bypass valve. Install solenoid valves in horizontal lines with coil at the top. 1. Electrical wiring for solenoid valves is specified in Division 26. Coordinate electrical requirements and connections. E. Thermostatic expansion valves may be mounted in any position, as close as possible to the evaporator. 1. Where refrigerant distributors are used, mount the distributor directly on the expansion valve outlet. 2. Install the valve in such a location so that the diaphragm case is warmer than the bulb. F. Install pressure regulating and relieving valves as required by ASHRAE Standard 15. 3.07 EQUIPMENT CONNECTIONS: A. The Drawings indicate the general arrangement of piping, fittings, and specialties. B. Install piping adjacent to machine to allow servicing and maintenance. C. Install flexible pipeline connectors in all field installed refrigerant lines connecting condensing units and compressors to remote evaporators. 3.08 FIELD QUALITY CONTROL: A. Inspect, test, and perform corrective action of refrigerant piping in accordance with ASME Code B31.5, Chapter VI. B. Repair leaking joints using new materials, and retest for leaks. THE KENT 23 23 00 - 7 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT 3.09 CLEANING: A. Before installation of copper tubing other than Type ACR tubing, clean the tubing and fitting using following cleaning procedure: 1. Draw a clean lint-less cloth saturated with trichloroethylene through the tube or pipe. Continue this procedure until cloth is not discolored by dirt. 2. Finally, draw a clean dry, lint-less cloth through the tube or pipe. 3.10 ADJUSTING AND CLEANING: A. Verify actual evaporator applications and operating conditions, and adjust thermostatic expansion valve to obtain proper evaporator superheat requirements. B. Adjust controls and safeties. Replace damaged or malfunctioning controls and equipment with new materials and products. 3.11 COMMISSIONING: A. Charge system using the following procedure: 1. Install core in filter dryer after leak test but before evacuation. 2. Evacuate refrigerant system with a reclaim vacuum pump until temperature of 35 deg F is indicated on vacuum dehydration indicator. 3. During evacuation, apply heat to pockets, elbows, and low spots in piping. 4. Maintain vacuum on system for minimum of 5 hours after closing valve between vacuum pump and system. 5. Break the vacuum with refrigerant gas and allow pressure to build up to 2 psig. 6. Complete charging of system, using new filter dryer core in charging line. Provide full operating charge. B. Train Owner's maintenance personnel on procedures and schedules related to start-up and shut-down, troubleshooting, servicing, and preventative maintenance of refrigerant piping valves and refrigerant piping specialties. Schedule training with Owner through the Architect, with at least 7 days advance notice. C. Review data in Operating and Maintenance Manuals. END OF SECTION THE KENT 23 23 00 - 8 THE KENT Issue Date 05.09.18 REFRIGERANT PIPING AND SPECIALTIES THE KENT THIS PAGE IS LEFT INTENTIONALLY BLANK