ASME A112.4.1:2009 pdf download.Water Heater Relief Valve Drain Tubes.
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 pmducts intended for other than OEM applicaiions. the limitations of installation for the drain tube shall be permanently marked on the tube in lettering not less than 0.125 in. in height. For example. HAND-TlGHTEN ONLy,”“USE ONLY ON T & P VALVES WITH 105,000 Btu/hr OR LESS RA11NG, or “No l’Il’E S1ALANTS.”
3 TEST METhODS AND PERFORMANCE REQUIREMENTS
3.1 Temperature Test
3.1.1 Test Equipment, A S m-generatmg source capable of producing 105,000 BIu/hr at 15 psig pressure and 250’F temperature shall be used to conduct this test. The steam source shall be titled with instruments that measure pressure and temperature. The steam source shall be connected to a 3-in. relief valve that complies with ANSI Z21.22. The relief valve shall he mounted horizontally and the drain tube shall be installed in a downward position. For drain tubes intended for installation in relief valve locations at the top of a water heater. the test assembly shall be installed with the relief valve in a vertical position and the drain tube connected and tested accordingly.
3.1.2 Test Method. Prior to conducting this test, the inside diameter and length of the drain tube shall be measured and recorded. A thermocouple shall he attached to the outside surface of the drain tube within 3 in. i 0.5 In. of the relief valve in order to measure the equilibrium temperature.
2.5.1 The manufacturer’s name or trademark shall be permanently marked on the drain tube.
2.5.2 For pmducts intended for other than OEM applicaiions. the limitations of installation for the drain tube shall be permanently marked on the tube in lettering not less than 0.125 in. in height. For example. HAND-TlGHTEN ONLy,”“USE ONLY ON T & P VALVES WITH 105,000 Btu/hr OR LESS RA11NG, or “No l’Il’E S1ALANTS.”
3 TEST METhODS AND PERFORMANCE REQUIREMENTS
3.1 Temperature Test
3.1.1 Test Equipment, A S m-generatmg source capable of producing 105,000 BIu/hr at 15 psig pressure and 250’F temperature shall be used to conduct this test. The steam source shall be titled with instruments that measure pressure and temperature. The steam source shall be connected to a 3-in. relief valve that complies with ANSI Z21.22. The relief valve shall he mounted horizontally and the drain tube shall be installed in a downward position. For drain tubes intended for installation in relief valve locations at the top of a water heater. the test assembly shall be installed with the relief valve in a vertical position and the drain tube connected and tested accordingly.
3.1.2 Test Method. Prior to conducting this test, the inside diameter and length of the drain tube shall be measured and recorded. A thermocouple shall he attached to the outside surface of the drain tube within 3 in. i 0.5 In. of the relief valve in order to measure the equilibrium temperature.
