ASME A112.4.1 pdf download

ASME A112.4.1 pdf download Water Heater Relief Valve Drain Tubes
GENERAL
1.1 Scope
This Standard establishes performance requirementsand test methods applicable to water heater relief valvedrain (or runoff) tubes for use with relief valves havinga steam rating of 105,000 Btu/hr or less
1.2 Reference Standards
The following reference standards shall be used tcevaluate the product, and are cited herein. Unless indicated, the latest edition of these standards shall be applicable for certification to this Standard.
ANSI Z21.22, Relief Valves for Hot Water SupplySystemsPublisher: International Association of Plumbing andMechanical Officials (APMO)，20001 Walnut DriveSouth Walnut,CA91789-2825(www.iapmo.org)ASME B1.20.1, Pipe Threads, General Purpose (Inch)Publisher: The American Society of MechanicalEngineers(ASME),Three Park Avenue, New York NY10016-5990: Order Dept: 22 Law Drive,PO.Box 2900Fairfield，N] 07007-2900 (wwwasme.org)
2 REQUIREMENTS
21 Size
The drain tube shall have a minimum inside diameterof % in and a minimum length of 48 in
2.2 Material
The material that is used in the composition of thedrain tube shall be capable of withstanding the tempera.ture tests cited in section 3 without collapse or permanent distortion. Materials shall be corrosion resistant.
2.3 Joints
Any joints within the tube shall be firmly affixed andshall withstand the temperature tests without separationor leakage Assembly of the drain tube to the relief valveshall be possible by hand-tightening only. Connectingthreads shall comply with ASME B1.20.1 for % in. NPTpipe threads.
2.4 Installation Instructions Installation instructions, including post-installation relief valve testing procedures, shall be provided with the unit. A permanent tag or label relating to the relief valve test procedures shall be provided with the device.
2.5 Marking and Identification
2.5.1 The manufacturer’s name or trademark shall be permanently marked on the drain tube.
2.5.2 For products intended for other than OEM applications, the limitations of installation for the drain tube shall be permanently marked on the tube in let- tering not less than 0.125 in. in height. For example, “HAND-TIGHTEN ONLY,” “USE ONLY ON T & P VALVES WITH 105,000 Btu/hr OR LESS RATING,” or “NO PIPE SEALANTS.”
3 TEST METHODS AND PERFORMANCE REQUIREMENTS
3.1 Temperature Test
3.1.1 Test Equipment. A steam-generating source capable of producing 105,000 Btu/hr at 15 psig pressure and 250°F temperature shall be used to conduct this test. The steam source shall be fitted with instruments that measure pressure and temperature. The steam source shall be connected to a 3 ⁄ 4 -in. relief valve that complies with ANSI Z21.22. The relief valve shall be mounted horizontally and the drain tube shall be installed in a downward position. For drain tubes intended for instal- lationinreliefvalve locations atthe top ofa water heater, the test assembly shall be installed with the relief valve in a vertical position and the drain tube connected and tested accordingly.