SECTION 23 21 13 HYDRONIC PIPING PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section includes piping, special-duty valves, and hydronic specialties for hot-water heating and chilled-water cooling systems; makeup water for these systems; blowdown drain lines; and condensate drain piping. B. Related Sections include the following: 1. Division 23 Section "Common Work Results for HVAC" for general piping materials and installation requirements. 2. Division 23 Section "Hangers and Supports for HVAC Piping and Equipment" for pipe supports, product descriptions, and installation requirements. Hanger and support spacing is specified in this Section. 3. Division 23 Section "General-Duty Valves for HVAC Piping" for general-duty ball, butterfly, and check valves. 4. Division 23 Section "Meters and Gages for HVAC Piping" for thermometers, meters, and pressure gages. 5. Division 23 Section "Identification for HVAC Piping and Equipment" for labeling and identifying hydronic piping. 6. Division 23 Section "Hydronic Pumps" for pumps, motors, and accessories for hydronic piping. 7. Division 34 Section "HVAC Controls and Instrumentation." 1.3 SUBMITTALS A. Product Data: Product Data including rated capacities where applicable, including piping, fittings, furnished options and accessories, and installation instructions for each specialty indicated. Include flow and pressure drop curves based on manufacturer's testing for flow-control valves. 1. Grooved joint couplings and fittings shall be shown on drawings and product submittals and shall be specifically identified with the applicable manufacturer's style or series designation. The Contractor s field personnel shall be adequately trained by a factory-trained representative in the use of grooving tools, application of groove, and installation of grooved joint products prior to the start of the mechanical grooved piping installation. Submit a manufacturer's letter of 23 21 13 / 1
certification for each pipe fitter demonstrating that they have been trained in the installation of the fitting system. B. Shop Drawings: Detail fabrication of pipe anchors, hangers, special pipe support assemblies, alignment guides, expansion loops, and their attachment to the building structure. Detail location of anchors, alignment guides, and expansion loops. C. Welding Certificates: Copies of certificates for welding procedures and personnel. D. Field Test Reports: Written reports of tests specified in Part 3 of this Section. Include the following: 1. Test procedures used. 2. Test results that comply with requirements. 3. Failed test results and corrective action taken to achieve requirements. E. Maintenance Data: For hydronic specialties and special-duty valves to include in maintenance manuals. F. Water Analysis: Submit a copy of the water analysis to illustrate water quality available at Project site. 1.4 QUALITY ASSURANCE A. Welding: Qualify processes and operators according to the ASME Boiler and Pressure Vessel Code: Section IX, "Welding and Brazing Qualifications." B. ASME Compliance: Comply with ASME B31.9, "Building Services Piping," for materials, products, and installation. Safety valves and pressure vessels shall bear the appropriate ASME label. Fabricate and stamp air separators and expansion tanks to comply with the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1. C. All grooved joint couplings and fittings shall be the products of a single manufacturer. Grooving tools shall be supplied by the mechanical grooved coupling manufacturer and shall form grooves that conform to ANSI/AWWA C-606 standards. D. All mechanical grooved piping work including pipe grooving, shall be accomplished in accordance to the latest published grooved mechanical coupling manufacturer s installation instructions. E. Installers of Pressure-Sealed Joints (e.g. Viega 'Pro-Press'): Installers shall be certified by the pressure-seal joint manufacturer as having been trained and qualified to join piping with pressure-seal pipe couplings and fittings. 1.5 COORDINATION A. Coordinate layout and installation of hydronic piping and suspension system components with other construction, including light fixtures, HVAC equipment, firesuppression-system components, and partition assemblies. 23 21 13 / 2
B. Coordinate piping installation with roof curbs, equipment supports, and roof penetrations. C. Coordinate pipe fitting pressure classes with products specified in related Sections. D. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into base. Concrete, reinforcement, and formwork requirements are specified in Division 03 Sections. E. Coordinate installation of pipe sleeves for penetrations through walls and floor assemblies. 1.6 EXTRA MATERIALS A. Water Treatment Chemicals: Furnish sufficient chemicals for initial system startup and for preventive maintenance for one year from date of Substantial Completion. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Manufacturers: Subject to compliance with requirements, provide products by one of the following: 1. Grooved Mechanical-Joint Fittings and Couplings: a. Victaulic Company of America. b. Tyco Grinnell Mechanical Products. c. ANVIL International Gruvlok. 2. Flow Control Valves: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. Flow Design, Inc. d. Gerand Engineering Co. e. HCI, Inc. f. ITT Fluid Technology Corp.; ITT Bell & Gossett. g. Nibco. h. Taco, Inc. i. Tyco Grinnel Mechanical Products. j. Belimo. 3. Globe Type Check Valves at Pumps: a. Metraflex Company. b. Mueller Valve Co. c. O.C. Keckley Co. d. Titan Flow Control, Inc. 23 21 13 / 3
4. Safety Relief Valves: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. Conbraco Industries, Inc. d. ITT Fluid Technology Corp.; ITT McDonnell & Miller. e. O.C. Keckley Co. f. Watts. 5. Diaphragm-Type Expansion Tanks: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. ITT Fluid Technology Corp.; ITT Bell & Gossett. d. Taco, Inc. 6. Air Separators: a. Amtrol, Inc. b. Armstrong Pumps, Inc. c. ITT Fluid Technology Corp.; ITT Bell & Gossett. d. Taco, Inc. 7. Make-up Water Valves: a. Hersey. b. Conbraco. c. Watts. 8. Chemical Water Treatment Products: a. Barclay Chemical Co., Inc. b. Dexter Corp., (The); Dexter Water Management Systems Div. c. DuBois Chemicals, Inc.; DuBois USA Subsidiary. d. Grace: W.R. Grace & Co.; Dearborn Div. e. Inter-State Chemical Co. f. Merck & Co., Inc.; Calgon Corp. Subsidiary. g. Nalco Chemical Co. 9. Propylene Glycol: a. Dow Chemical Co. (Dowfrost HD). b. Interstate Chemical (Intercool NFP). c. Ohio Chemical Services (Protocol NT). 10. Glycol Make Unit: a. Wessels, Inc. (Model GMP-13050). 2.2 PIPE AND TUBING MATERIALS 23 21 13 / 4
A. General: Refer to Part 3 "Pipe Applications" Article for identifying where the following materials are used. B. Steel Pipe: ASTM A 53, Type E or S, Grade A or B, Schedule 40, plain ends. 1. Steel Pipe Nipples: ASTM A 733, made of ASTM A 53, Schedule 40, carbon steel, seamless for 2-inch NPS and smaller and electric-resistance welded for 2-1/2-inch NPS and larger. C. Drawn-Temper Copper Tubing: ASTM B 88, Type L. D. Stainless Steel Pipe: ASTM A312, Type 304/304L, Schedule 10S, with plain ends for use with Victaulic 'Vic-Press' fitting system. 2.3 FITTINGS A. Wrought-Copper Fittings: ASME B16.22. B. Wrought-Copper Unions: ASME B16.22. C. Cast-Iron Threaded Fittings: ASME B16.4; Class 125. D. Malleable-Iron Threaded Fittings: ASME B16.3, Class 150. E. Malleable-Iron Unions: ASME B16.39; Class 150. F. Wrought-Steel Fittings: ASTM A 234, Standard Weight. G. Wrought-Steel Flanges and Flanged Fittings: ASME B16.5, Class 150 including bolts, nuts, and gaskets of the following material group, end connections, and facings: 1. Material Group: 1.1. 2. End Connections: Butt welding. 3. Facings: Raised face. H. Grooved Mechanical-Joint Fittings: ASTM A 536, Grade 65-45-12 ductile iron; ASTM A 53, Type E or S, Grade B factory fabricated steel; or ASTM A 234, Grade WPB steel fittings with grooves or shoulders designed to accept grooved end couplings. I. Stainless Steel Pressure-Seal Fittings: Cold drawn stainless steel with EPDM elastomer O- ring seals, suitable for working pressure of 300 psig at 230 deg. F. 1. Housing: Stainless Steel. 2. O-Rings and Pipe Stops: EPDM. 3. Tools: Manufacturer's special tools. 4. Manufacturer: Victaulic Vic-Press for Schedule 10S pipe. (no substitutions). 5. Where permitted: Vic-Press fittings are only permitted on heating hot water piping systems, sizes 2 inches and smaller, in accessible areas. Vic-Press may not be used above drywall ceilings, in shafts, or other difficult to access locations. 'Accessible areas' include mechanical equipment rooms and above lay-in tile ceilings. 23 21 13 / 5
J. Viega 'Pro-Press' Pressure Seal Fittings: Copper, pressure seal fittings. 1. Housing: Copper. 2. O-Rings and Pipe Stops: EPDM. 3. Tools: Manufacturer's special tools. 4. Minimum 200-psig working-pressure rating at 250 deg F. 5. Use manufacturer-recommended tool and procedure. Leave insertion marks on pipe after assembly. 6. Where permitted: Pro Press fittings are only permitted in sizes 2 inches and smaller, in accessible areas. Pro Press may not be used above drywall ceilings, in shafts, or other difficult to access locations. 'Accessible areas' include mechanical equipment rooms and above lay-in tile ceilings. 7. Nibco 'Press' fittings are an acceptable alternative to Viega 'Pro-Press' fittings, however only one manufacturer may be used on the Project. K. Grooved Mechanical-Joint Couplings: Consist of two ductile-iron housings, a synthetic rubber (EPDM) gasket of a central cavity pressure-responsive design; with nuts, bolts to secure grooved pipe and fittings. 1. 2-1/2 inches to 12 inches: a. Rigid Type: Housings shall provide rigidity and system support and hanging in accordance with ANSI B31.1 and B31.9. 1) Sizes through 8 inches: Installation-Ready, for direct stab installation without field disassembly, with grade EHP gasket rated to +250 deg F; Victaulic Style 107 2) Tyco Grinnell Style 772 rigid couplings, with grade E (EPDM) gasket rated to +230 deg. F. maybe used in lieu of the installation-ready type couplings. 3) ANVIL Gruvlok Style 7400 or 7401 Rigidlok Couplings with grade E (EPDM) gasket rated to +250 deg. F may be used in lieu of installationready type couplings. b. Flexible Type: Use only in locations as needed or where vibration attenuation and stress relief are required. 1) Sizes through 8 inches: Installation-Ready, for direct stab installation without field disassembly, with grade EHP gasket rated to +250 deg F; Victaulic Style 177. 2) Tyco Grinnell Style 707 or 705 flexible couplings, with grade E (EPDM) gasket rated to +230 deg. F. maybe used in lieu of the installationready type couplings. 3) ANVIL Gruvlok Style 7000 or 7001 flexible couplings, with grade E (EPDM) gasket rated to +250 deg. F may be used in lieu of installationready type couplings. 2.4 JOINING MATERIALS A. Welding Materials: Comply with Section II, Part C of ASME Boiler and Pressure Vessel Code for welding materials appropriate for wall thickness and for chemical analysis of pipe being welded. 23 21 13 / 6
B. Gasket Material: Thickness, material, and type suitable for fluid to be handled; and design temperatures and pressures. C. Solder Filler Metals: ASTM B 32, 95-5 tin antimony. D. Grooved Materials: Use grooving tools and lubricant for gaskets manufactured and supplied by the coupling manufacturer. 2.5 VALVES A. Check, ball, and butterfly valves are specified in Division 23 Section "General-Duty Valves for HVAC Piping." B. Refer to Part 3 "Valve Applications" Article for specific uses and applications for each valve specified. C. Flow Control Valves: 125-psig working pressure, 250 deg F maximum operating temperature, globe or ball valve with calibrated orifice. Provide with connections for portable differential pressure meter with integral check valves and seals. Valve shall have integral pointer and calibrated scale to register degree of valve opening and memory stop to retain set position. Valves 2-inch NPS and smaller shall have bronze body with threaded ends and 2-1/2-inch NPS and larger valves shall have cast iron body with flanged ends. 1. Portable Meters: Differential-pressure gage. Include two 12-foot hoses in carrying case with handle. Meter shall remain the property of the Owner. a. Scale: Inches of water, unless otherwise indicated. b. Accuracy: Plus or minus 2 percent between 20 and 80 percent of range. D. Globe Type Check Valves at Pumps: To control surge pressures and resulting water hammer with spring-loaded bronze or alloy wafer style disc suitable for 150 psi CWP with Class 150 ANSI flanges. Valves shall be iron body, flanged, with bronze trim. E. Safety Relief Valves: Brass or bronze body with brass and rubber, wetted, internal working parts; to suit system pressure and heat capacity; according to ASME Boiler and Pressure Vessel Code, Section IV. F. Make-up Water Valves: Provide on cold water makeup piping to the hot water system, water pressure reducing valves to provide automatic filling of the systems. Pressure reducing valve shall be suitable for 125 psi CWP, with cast bronze body and bronze trim. Reducing valves shall be set to system fill pressure. 2.6 HYDRONIC SPECIALTIES A. Manual Air Vent: Bronze body and nonferrous internal parts; 150-psig working pressure, 225 deg F operating temperature; manually operated with screwdriver or thumbscrew; with 1/8-inch NPS discharge connection and 1/2-inch NPS inlet connection. 23 21 13 / 7
B. Automatic Air Vent: Designed to vent automatically with float principle; bronze body and nonferrous internal parts; 150-psig working pressure, 240 deg F operating temperature; with 1/4-inch NPS discharge connection and 1/2-inch NPS inlet connection. C. Diaphragm-Type Expansion Tanks: Welded carbon steel for 125-psig working pressure, 240 deg F maximum operating temperature. Separate air charge from system water to maintain design expansion capacity, by a flexible diaphragm securely sealed into tank. Provide taps for pressure gage and air-charging fitting, and drain fitting. Support vertical tanks with steel legs or base; support horizontal tanks with steel saddles. Fabricate and test tank with taps and supports, and label according to ASME Boiler and Pressure Vessel Code, Section VIII, Division 1. D. Air Separators: Welded black steel; ASME constructed and labeled for 125-psig minimum working pressure and 240 deg F maximum operating temperature; perforated stainless-steel air collector tube designed to direct released air into expansion tank; tangential inlet and outlet connections; threaded connections for 2-inch NPS and smaller; flanged connections for 1-1/2-inch NPS and larger; threaded blow-down connection. Provide units in sizes for full-system flow capacity. E. Y-Pattern Strainers: 125-psig working pressure; cast-iron body (ASTM A 126, Class B), flanged ends for 2-1/2-inch NPS and larger, threaded connections for 2-inch NPS and smaller, bolted cover, perforated Type 304 stainless-steel basket, and bottom drain connection. F. Chemical Feeder: Bypass-type chemical feeders of 5-gallon capacity, welded steel construction; 125-psig working pressure; complete with fill funnel and inlet, outlet, and drain valves. 1. Chemicals: Specially formulated to prevent accumulation of scale and corrosion in piping system and connected equipment, and based on a water analysis of makeup water. 2. Chemical Piping: Construct of Schedule 40 PVC or stainless steel pipe as recommended by the chemical supplier. 2.7 PROPYLENE GLYCOL/WATER SOLUTION A. Provide a sufficient quantity of commercial inhibited propylene glycol in the hot water system to provide a solution which will prevent the water from freezing at an outdoor ambient temperature of 0 deg. F. Glycol shall meet the requirements of ASTM D-2695. Conduct refractometer tests initially and periodically over the warranty period to assure that a proper mixture is maintained. Advise the Owner in writing of the type of glycol, total amount provided and guaranteed lowest outdoor ambient temperature at which freezing will be prevented. B. Glycol/water solution shall be premixed with de-ionized water conforming to ASTM D1193, Type II reagent water standard. Solution shall be pumped into the system by the Contractor. 23 21 13 / 8
2.8 GLYCOL MAKE-UP UNIT A. Provide a prefabricated, automatic make-up unit for the hot water system. B. The package shall be designed to occupy a minimum amount of floor space to operate on a standard 110 V, 60 Hz electrical circuit, and to maintain a fill pressure in the glycol system of 12 psig (adjustable). C. The unit shall feature a cut-off and alarm arrangement which will stop the pump in case of excessive pressure, or a low solution level, and activate an audible (which can be silenced) and a visual alarm. A 110 V signal shall also be available for a remote alarm. D. A 50 gallon translucent polyethylene solution container, complete with lid, shall be mounted on the pumping assembly and shall include a strainer and a shutoff valve. A 3/4" NPT glycol solution recovery line shall be piped in from the system relief valve outlet to the solution container, through its lid in such a way that the lid can be removed for filling and mixing. E. The pumping assembly shall be mounted in a sturdy steel frame with legs to keep it off the floor. It shall include a 1.8 US GPM at 50 psig pump, a 1/3 HP motor, a magnetic starter, a pressure tank with a pressure control, a priming valve, a PRV, a shutoff valve and a pressure gauge. It shall be connected to the system with a 1/2" NPT connection. 2.9 AC CONDENSATE PUMPS A. Simplex AC condensate pumps shall be a UL-listed packaged unit with corrosionresistant pump impeller and stainless steel shaft, cast aluminum reservoir tank with cover and three drain holes, and fully automatic controls including snap action float switch and thermal overload protection. Suitable for up to 150 deg F. fluid (intermittent operation). Include factory- or field-installed barbed 3/8 check valve. 1. Pump shall be designed and fabricated specifically for a hard wired electrical connection. Provide a 120V toggle switch. 2. Pump shall be plenum rated as per UL 2043. 3. Provide a high level float switch on the reservoir tank and inter with the heat pump unit operation. The heat pump shall be disabled upon reaching the high limit level in the reservoir. 4. Maximum dimensions: 9 x 6 x10 tall. B. Performance: 1. 1. Pumping capacity: Minimum 4 GPM (240 GPH) at 12 feet of head w.g. 2. 2. Reservoir capacity: 1 gallon. 3. 3. Motor: 1/10 HP. 3.5A at 115V, single phase, 60Hz. 4. Manufacturer: Hartell A2X-1965 DV, or approved equal. 23 21 13 / 9
PART 3 - EXECUTION 3.1 PIPE APPLICATIONS A. Hot Water and Chilled Water,and other closed loop hydronic system piping, 2-Inch NPS and Smaller: Use [Schedule 40 steel pipe with Class 125/150 threaded joints or Type L drawn-temper copper tubing with soldered or pressure seal joints. 1. Stainless steel pipe with Victaulic Vic-Press joints may be used in lieu of the above. B. Hot Water and Chilled Water System, 2-1/2-Inch NPS and Larger: Use Schedule 40 steel pipe with welded and flanged joints or grooved mechanical joints rated at Class 125/150 or copper pressure-seal-joint fittings. C. Cold Water Make-Up Piping, All Sizes: Use Type L drawn-temper copper tubing with soldered joints or copper pressure-seal-joint fittings. D. Condensate Drain Piping, All Sizes: Use Type L drawn-temper copper tubing with soldered joints and Type DWV fittings or copper pressure-seal-joint fittings. E. Blowdown and Drain Piping: Same materials and joining methods as for piping specified for the service in which blowdown or miscellaneous drain is installed. F. Pressure Relief Valve Inlet and Outlet Piping: Same materials and joining methods as for piping specified for the service in which safety valve is installed. G. Referigerant Vent Piping: Use Type L drawn-temper copper tubing with soldered or pressure seal joints. 3.2 VALVE APPLICATIONS A. General-Duty Valve Applications: Unless otherwise indicated, use the following valve types: 1. Shutoff Duty: Use ball and butterfly valves. 2. Throttling Duty: Use flow control valves. B. Install shutoff-duty valves at each branch connection to supply and return mains, at supply and return connections to each piece of equipment, and elsewhere as indicated. C. Install flow control valves on the outlet of each hydronic coil, circulating pump and elsewhere as required to facilitate system balancing. D. Install drain valves at low points in mains, risers, branch lines, and elsewhere as required for system drainage. E. Install check valves on each pump discharge and elsewhere as required to control flow direction. 23 21 13 / 10
F. Install safety relief valves on hot water heat exchangers and elsewhere as required by ASME Boiler and Pressure Vessel Code. Pipe discharge to floor without valves. Comply with ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, for installation requirements. G. Install make-up water valves on domestic cold water piping to the hot water system. 3.3 PIPING INSTALLATIONS A. Install piping according to Division 23 Section "Common Work Results for HVAC". B. Locate groups of pipes parallel to each other, spaced to permit applying insulation and servicing of valves. C. Install drains at low points in mains, risers, and branch lines consisting of a tee fitting, 3/4- inch NPS ball valve, and short 3/4-inch NPS threaded nipple and cap. D. Install piping at a uniform grade of 0.2 percent upward in direction of flow. E. Reduce pipe sizes using eccentric reducer fitting installed with level side up. Lap joint stub ends are not permitted. F. Install branch connections to mains using tee fittings in main with takeoff out bottom of main, except for up-feed risers with takeoff out top of main line. G. Install unions in pipes 2-inch NPS and smaller, adjacent to each valve, at final connections of each piece of equipment, and elsewhere as indicated. H. Install flanges on valves, apparatus, and equipment having 2-1/2-inch NPS and larger connections. I. Install flexible connectors at inlet and discharge connections to pumps (except in-line pumps) and other vibration-producing equipment. 1. Three flexible type grooved joint couplings may be used in lieu of a flexible connector at equipment connections for vibration attenuation and stress relief. Couplings shall be placed in close proximity to the source of the vibration. J. Install strainers on supply side of each control valve, pump, and elsewhere as indicated. Install same size nipple and ball valve in blow-down connection of strainers. K. Anchor piping to ensure proper direction of expansion and contraction. L. The H.C. shall install all control valves, sensor wells, flow meters, and other similar equipment. The C.C. shall furnish all equipment listed. 3.4 HANGERS AND SUPPORTS A. General: Hanger, support, and anchor devices are specified in Division 23 Section "Hangers and Supports for HVAC Piping and Equipment." Conform to requirements below for maximum spacing of supports. 23 21 13 / 11
B. Install the following pipe attachments: 1. Adjustable steel clevis hangers for individual horizontal piping less than 20 feet long. 2. Adjustable roller hangers and spring hangers for individual horizontal piping 20 feet or longer. 3. Pipe Roller: MSS SP-58, Type 44 for multiple horizontal piping 20 feet or longer, supported on a trapeze. 4. Spring hangers to support vertical runs. 5. Provide copper-clad hangers and supports for hangers and supports in direct contact with copper pipe. C. Install hangers for steel piping with the following maximum spacing: 1. NPS 3/4: Maximum span, 7 feet. 2. NPS 1: Maximum span, 7 feet. 3. NPS 1-1/2: Maximum span, 9 feet. 4. NPS 2: Maximum span, 10 feet. 5. NPS 2-1/2: Maximum span, 11 feet. 6. NPS 3 and Larger: Maximum span, 12 feet. D. Install hangers for drawn-temper copper piping with the following maximum spacing and minimum rod sizes: 1. NPS 3/4: Maximum span, 5 feet; minimum rod size, 1/4 inch. 2. NPS 1: Maximum span, 6 feet; minimum rod size, 1/4 inch. 3. NPS 1-1/4Maximum span, 7 feet; minimum rod size, 3/8 inch. 4. NPS 1-1/2: Maximum span, 8 feet; minimum rod size, 3/8 inch. 5. NPS 2: Maximum span, 8 feet; minimum rod size, 3/8 inch. E. Support vertical runs at roof, at each floor, and at 10-foot intervals between floors. F. Provide additional hangers at each change of direction of piping and at concentrated equipment loads. 3.5 PIPE JOINT CONSTRUCTION A. Refer to Division 23 Section "Common Work Results for HVAC" for joint construction requirements for soldered joints in copper tubing; threaded, welded, and flanged joints in steel piping. B. Pressure-Sealed Joints (e.g. Viega 'Pro-Press'): Use manufacturer-recommended tool and procedure. Leave insertion marks on pipe after assembly. C. Mechanical Joints: Assemble joints according to fitting manufacturer's written instructions. This option does not permit the substitution of valves, strainers, or other piping system specialties marketed by the mechanical joint manufacturer. Mechanical joints used on the project shall be the product of one manufacturer and shall be designed specifically for building hydronic heating and cooling systems. 23 21 13 / 12
1. Grooved joint couplings and fittings shall be installed in accordance with the manufacturer s written installation instructions. Grooved ends shall be clean and free from indentations, projections, and roll marks in the area from pipe end to groove. Gaskets shall be verified as suitable for the intended service prior to installation. The Contractor s field personnel shall be adequately trained by a factory-trained representative in the use of grooving tools, application of groove, and installation of grooved joint products prior to the start of the mechanical grooved piping installation. 2. The factory-trained representative shall submit correspondence to all parties through the submittal process once the job-site training has been completed. 3. Factory-trained representative shall periodically visit the jobsite to insure the proper field grooving and product installation procedures are being followed. 4. Contractor shall remove and replace any improperly installed grooved mechanical products and the factory-trained representative shall provide additional training to the contractor to mitigate any further improperly installed products. 5. Pressure-Sealed Joints for Copper Tubing: Join copper tube and pressure-seal fittings with tools recommended by fitting manufacturer. 3.6 HYDRONIC SPECIALTIES INSTALLATION A. Install manual air vents at high points in system, at heat-transfer coils, and elsewhere as indicated or required for system air venting. B. Install automatic air vents at air separator, at inaccessible high points in the system, and elsewhere as indicated. C. Install in-line air separators in pump suction lines. Run piping to expansion tank with a 2 percent upward slope toward tank. Install drain valve on units 2-inch NPS and larger. D. Install diaphragm-type expansion tanks as indicated. Vent and purge air from hydronic system, and charge tank with proper air charge to suit system design requirements. 3.7 TERMINAL EQUIPMENT CONNECTIONS A. Piping size for supply and return shall be same size as equipment connections. B. Install control valves in accessible locations close to equipment. 3.8 FIELD QUALITY CONTROL A. Testing Preparation: Prepare hydronic piping according to ASME B31.9 and as follows: 1. Leave joints, including welds, uninsulated and exposed for examination during test. 2. Flush system with clean water. Clean strainers. 3. Isolate equipment that is not subjected to test pressure from piping. If a valve is used to isolate equipment, its closure shall be capable of sealing against test 23 21 13 / 13
pressure without damage to valve. Flanged joints where blinds are inserted to isolate equipment need not be tested. 4. Install relief valve set at a pressure no more than one-third higher than test pressure, to protect against damage by expanding liquid or other source of overpressure during test. B. Testing: Test hydronic piping as follows: 1. Use ambient temperature water as testing medium, except where there is risk of damage due to freezing. Another liquid may be used if it is safe for workers and compatible with piping system components. 2. Use vents installed at the high points of system to release trapped air while filling system. Use drains installed at low points for complete removal of liquid. 3. Examine system to see that equipment and parts that cannot withstand test pressures are properly isolated. Examine test equipment to ensure that it is tight and that low-pressure filling lines are disconnected. 4. Subject piping system to hydrostatic test pressure that is not less than 1.5 times the design pressure. Test pressure shall not exceed maximum pressure for any vessel, pump, valve, or other component in system under test. Check to verify that stress due to pressure at bottom of vertical runs does not exceed either 90 percent of specified minimum yield strength or 1.7 times "SE" value in Appendix A of ASME B31.9, Code for Pressure Piping, "Building Services Piping." 5. After hydrostatic test pressure has been applied for at least 10 minutes, examine piping, joints, and connections for leakage. Eliminate leaks by tightening, repairing, or replacing components as appropriate, and repeat hydrostatic test until there are no leaks. 6. Prepare written report of testing. C. Use of pressurized air for testing of hydronic piping systems is strictly prohibited. 3.9 ADJUSTING AND CLEANING A. After completing system installation, including outlet fittings and devices, inspect finish. Remove burrs, dirt, and construction debris, and repair damaged finishes including chips, scratches, and abrasions. B. Flushing: Flush new hydronic piping systems with clean water prior to connection to existing piping system. Remove, clean, and replace strainer screens. C. Cleaning: 1. Hydronic system piping, circulating pumps, equipment and water passages shall be cleaned by circulating mixtures of trisodium phosphate, sodium carbonate or sodium hydroxide and water. Their preference is in the order named and should be used in the following proportions using a solution of only one type in the system: a. Trisodium phosphate, 1 lb. for each 50 gallons in the system. b. Sodium carbonate, 1 lb. for each 30 gallons in the system. c. Sodium hydroxide, 1 lb. for each 50 gallons in the system. 23 21 13 / 14
2. Fill, vent and circulate system with the solution. Allow solution to reach design or operating temperatures if possible. After system has been circulated for four hours, system shall be drained completely and refilled with fresh water. The system shall be thoroughly vented of air. 3. After cleaning and flushing hydronic piping system, but before balancing, remove, clean and replace strainer screens. D. Chemical Treatment: Provide a water analysis prepared by chemical treatment supplier to determine type and level of chemicals required to prevent scale and corrosion. Perform initial treatment after completing system testing. Water analysis shall be made after complete system has been cleaned. Two copies of each water analysis along with two copies of the treatment recommended, shall be furnished, one copy delivered to the Owner and one copy delivered to the Architect. The analysis shall be made by the approved feeder supplier. Chemicals for the initial filling of the system shall be purchased by the Contractor. Chemical containers shall be marked with the chemical name and appropriate hazard warnings as required by OSHA 29, CFR 1910.1200. 3.10 COMMISSIONING A. Fill system and perform initial chemical treatment. B. Check expansion tanks to determine that they are not air bound and that system is completely full of water. C. Perform these steps before operating the system: 1. Open valves to fully open position. Close coil bypass valves. 2. Check pump for proper direction of rotation. 3. Set automatic fill valves for required system pressure. 4. Check air vents at high points of systems and determine if all are installed and operating freely (automatic type) or bleed air completely (manual type). 5. Set temperature controls so all coils are calling for full flow. 6. Check and set operating temperatures of heat exchangers to design requirements. 7. Lubricate motors and bearings. END OF SECTION 23 21 13 / 15