ASME A112.4.1:2009 pdf free download

ASME A112.4.1:2009 pdf free download.Water Heater Relief Valve Drain Tubes.
2.4 Installation Instructions
Installation instmctions induding post-installation relief valve testing procedures. shall be provided with the unit. A permanent tag or Label rebting 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 applicatiins, 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-TIc.IITEN ONLY”‘USE ONLY ON T & P VALVES WITH 105,000 lltu/hr OR LESS RATING,’ or ‘NO PIPE SEALAN1S.’
3 rEST METHODS AND PERFORMANCE REQUIREMENTS
3.1 Temperature Test
3.1.1 Test Equipment. A steam-generating soure capable of producing 105,0(X) Btufhr 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 34-in. rebef 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 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 be attached to the outside surface of the drain tube within 3 in. ± 0.5 in. of the relief valve in order to measure the equilibrium temperature. The steam generator shall be activated and the relief valve shall be manually lockedin an open position. Steam discharge conditions of105,000 Btu/hr ± 5% Btu/ hr, pressure ratings of 15 psig.and temperature values of 250RF shall be established.When the thermocouple on the drain tube assemblyindicates equilibrium temperature has been attained, thetest shall continue for 15 ‘min. After 15 min.