INTERNATIONAL ASSOCIATION OF PLUMBING AND MECHANICAL OFFICIALS

Transcription

1 INTERNATIONAL ASSOCIATION OF PLUMBING AND MECHANICAL OFFICIALS IAPMO GUIDE CRITERIA FOR WATER HEATER SUPPLY SHUTOFF VALVE WITH A / THERMAL EXPANSION CONTROL VALVE IGC a8 1. PURPOSE 1.1 The purpose of this standard is to establish an acceptable minimum standard for water heater supply shutoff valve with a / thermal expansion control valves. Its purpose is to serve as a guide for producers, distributors, architects, engineers, contractors, installers, inspectors and users; to promote an understanding regarding materials, manufacture and installation; and to provide for identifying thermal expansion control devices that conform to this standard. 1.2 The provisions of this standard are not intended to prevent the use of any alternate material or method of construction, provided any such alternate meets the intent and requirements of this document and changes are amended to this standard. 2. SCOPE 2.1 This standard covers the test methods and performance requirements applicable for water heater supply shutoff valve with a / thermal expansion control valves for use on closed plumbing systems. 3. REFERENCE STANDARDS 3.1 All standards referenced herein shall be the current edition of that standard. IAPMO IGC 85 IAPMO IGC 157 MSS-SP-25 MSS-SP-110 Thermal Expansion Relief Valves Ball Valves Standard Marking System for Valves, Fittings, Flanges and Unions Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends 4. DEFINITIONS 4.1 Thermal Expansion Control Valve. An auxiliary device used to control thermal expansion in a closed plumbing system that is used in conjunction with a thermal expansion relief valve. Copyright 2006 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC a Wtr Htr Shtoff 1 of 3

2 4.2 Thermal Expansion Relief Valve. A safety device used to provide overpressure protection in a closed plumbing system. 4.3 Thermal Relief Pressure. The internal pressure at which the thermal expansion control valve begins to relieve pressure to control thermal expansion in a closed plumbing system. 4.4 Set Pressure. The pressure at which a thermal expansion relief valve is designed to relieve pressure from a water supply system. 5. GENERAL REQUIREMENTS 5.1 The water heater supply shutoff valve with a /thermal expansion control valve shall consist of a ball valve with integral thermal expansion control valve. The water heater supply shutoff valve with a /thermal expansion control device shall be constructed to provide thermal expansion relief at a pressure of 25 psig or more below the manufacturer s set pressure rating of the primary thermal expansion relief valve defined in IAPMO IGC The supply shutoff valve shall meet the design and testing requirements of MSS- SP-110 or IGC 157. Production testing shall be performed prior to integration of the thermal expansion control valve End connections such as threaded, socket-welding, solder joint, grooved and flared end shall comply with the requirements in MSS-SP-110 or IGC 157. Alternative end connections shall comply with the applicable ASTM standard. 5.3 The thermal expansion control valve shall be of a spring loaded check design. The drainage fitting may be supplied by the manufacturer. The minimum orifice diameter of the drainage fitting shall be inch. Production testing shall be performed prior to integration with the shutoff valve. 5.4 Materials. The valve body and its operating parts shall be made of compatible corrosion resistant materials. An internal spring used in the thermal expansion control valve shall be made of material having corrosion resistance equal to that of AISI 302 stainless steel. 5.5 Drainage pipe or tube shall be piped in a vertical or downward sloping position to a suitable drain and shall terminate at least 3 inches above the drain. As an alternate, an air gap may be installed at the outlet of the thermal expansion control valve. The minimum internal diameter of the drainage pipe or tubing shall be inch. 5.6 Representative samples of the water heater supply shutoff valve with a /thermal expansion control valve shall be subjected to the tests described in these requirements. Copyright 2006 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC a Wtr Htr Shtoff 2 of 3

3 6. PERFORMANCE REQUIREMENTS 6.1 Hydrostatic Test. The water heater shutoff/thermal expansion control valve shall withstand for one (1) minute, without leakage, an internal hydrostatic pressure equal to 90% of the thermal relief pressure setting Thermal Relief Test. The valve shall be installed in a test fixture simulating a closed piping system with a thermal expansion relief valve. The media shall be water. All air is to be removed from the system. Raise the internal pressure in the valve equal to 90% of the thermal relief pressure setting. Valve shall not leak when held for (1) minute. Continue to raise water pressure The water is to be slowly heated until the thermal expansion control valve begins to relieve pressure, indicated by dripping or flow from the thermal expansion control valve. The thermal relief pressure of the valve is to be within ±10% of the thermal relief pressure setting on the valve. The test water temperature may not exceed 190 F Cycle Test. A thermal expansion control valve set at 125 psig shall be connected to a water supply and pressurized to 140 psig at ambient temperature. The pressure shall be reduced until the valve reseats and seals. A method shall be employed to activate the assembly for 10,000 cycles. There shall be no signs of failure or leakage during the cycle test. 7. MARKING AND IDENTIFICATION 7.1 Valves shall be permanently marked or tagged with the following: (d) (e) (f) Manufacturer's name or trademark; nominal size of shutoff valve; model number; set pressure and maximum temperature rating; a flow arrow indicating direction of flow for the shutoff valve; the words If control valve fails, discard and replace with new control valve 7.2 Installation Instructions Each valve shall be provided with installation instructions that contain the following: a statement prohibiting threads at the discharge end of the relief line, a statement requiring the discharge line to be secured to prevent movement of the line during discharge, a statement requiring that the drainage line be piped independently of the of the water heater relief valve drain. Accepted: 6/98 Revised 1/2000, 4/2002, 10/2006, 12/2006 Copyright 2006 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC a Wtr Htr Shtoff 3 of 3

4 INTERNATIONAL ASSOCIATION OF PLUMBING AND MECHANICAL OFFICIALS IAPMO GUIDE CRITERIA FOR WATER HEATER SUPPLY SHUTOFF VALVE WITH A THERMAL EXPANSION CONTROL VALVE IGC PURPOSE 1.1 The purpose of this standard is to establish an acceptable minimum standard for water heater supply shutoff valve with a thermal expansion control valves. Its purpose is to serve as a guide for producers, distributors, architects, engineers, contractors, installers, inspectors and users; to promote an understanding regarding materials, manufacture and installation; and to provide for identifying thermal expansion control devices that conform to this standard. 1.2 The provisions of this standard are not intended to prevent the use of any alternate material or method of construction, provided any such alternate meets the intent and requirements of this document and changes are amended to this standard. 2. SCOPE 2.1 This standard covers the test methods and performance requirements applicable for water heater supply shutoff valve with a thermal expansion control valves for use on closed plumbing systems. 3. REFERENCE STANDARDS 3.1 All standards referenced herein shall be the current edition of that standard. IAPMO IGC 157 MSS-SP-25 MSS-SP-110 Ball Valves Standard Marking System for Valves, Fittings, Flanges and Unions Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends 4. DEFINITIONS 4.1 Thermal Expansion Control Valve. An auxiliary device used to control thermal expansion in a closed plumbing system that is used in conjunction with a thermal expansion relief valve. Copyright 2008 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC Wtr Htr Shtoff 1 of 3

5 4.2 Thermal Expansion Relief Valve. A safety device used to provide overpressure protection in a closed plumbing system. 4.3 Thermal Relief Pressure. The internal pressure at which the thermal expansion control valve begins to relieve pressure to control thermal expansion in a closed plumbing system. 4.4 Set Pressure. The pressure at which a thermal expansion relief valve is designed to relieve pressure from a water supply system. 5. GENERAL REQUIREMENTS 5.1 The water heater supply shutoff valve with a thermal expansion control valve shall consist of a ball valve with integral thermal expansion control valve. The water heater supply shutoff valve with a thermal expansion control device shall be constructed to provide thermal expansion relief at or below the manufacturer s set pressure rating. 5.2 The supply shutoff valve shall meet the design and testing requirements of MSS- SP-110 or IGC 157. Production testing shall be performed prior to integration of the thermal expansion control valve End connections such as threaded, socket-welding, solder joint, grooved and flared end shall comply with the requirements in MSS-SP-110 or IGC 157. Alternative end connections shall comply with the applicable ASTM standard. 5.3 The thermal expansion control valve shall be of a spring loaded check design. The drainage fitting may be supplied by the manufacturer. The minimum orifice diameter of the drainage fitting shall be inch. Production testing shall be performed prior to integration with the shutoff valve. 5.4 Materials. The valve body and its operating parts shall be made of compatible corrosion resistant materials. An internal spring used in the thermal expansion control valve shall be made of material having corrosion resistance equal to that of AISI 302 stainless steel. 5.5 Drainage pipe or tube shall be piped in a vertical or downward sloping position to a suitable drain and shall terminate at least 3 inches above the drain. As an alternate, an air gap may be installed at the outlet of the thermal expansion control valve. The minimum internal diameter of the drainage pipe or tubing shall be inch. 5.6 Representative samples of the water heater supply shutoff valve with a thermal expansion control valve shall be subjected to the tests described in these requirements. 6. PERFORMANCE REQUIREMENTS Copyright 2008 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC Wtr Htr Shtoff 2 of 3

6 6.1 Thermal Relief Test. The valve shall be installed in a test fixture simulating a closed piping system with a thermal expansion relief valve. The media shall be water. All air is to be removed from the system. Raise the internal pressure in the valve equal to 90% of the thermal relief pressure setting. Valve shall not leak when held for (1) minute. Continue to raise water pressure until the thermal expansion control valve begins to relieve pressure, indicated by dripping or flow from the thermal expansion control valve. The thermal relief pressure of the valve is to be within ±10% of the thermal relief pressure setting on the valve. The test water temperature may not exceed 190 F. 6.2 Cycle Test. A thermal expansion control valve set at 125 psig shall be connected to a water supply and pressurized to 140 psig at ambient temperature. The pressure shall be reduced until the valve reseats and seals. A method shall be employed to activate the assembly for 10,000 cycles. There shall be no signs of failure or leakage during the cycle test. 7. MARKING AND IDENTIFICATION 7.1 Valves shall be permanently marked or tagged with the following: (d) (e) (f) Manufacturer's name or trademark; nominal size of shutoff valve; model number; set pressure and maximum temperature rating; a flow arrow indicating direction of flow for the shutoff valve; the words If control valve fails, discard and replace with new control valve 7.2 Installation Instructions Each valve shall be provided with installation instructions that contain the following: a statement prohibiting threads at the discharge end of the relief line, a statement requiring the discharge line to be secured to prevent movement of the line during discharge, a statement requiring that the drainage line be piped independently of the of the water heater relief valve drain. Accepted: 6/98 Revised 1/2000, 4/2002, 10/2006, 12/2006, 1/2008 Copyright 2008 by International Association of Plumbing and Mechanical Officials. All rights reserved. Printed in the United States of IGC Wtr Htr Shtoff 3 of 3