Valves

Rule 29. Sections 2-10 to 2-10.2 of the storage and handling of gaseous and Liquefied H2 code are added as follows: 2-10 Valves. 2-10.1 Shutoff valves shall have a rated service pressure not less than the rated service pressure of the entire system and shall be capable of withstanding a hydrostatic test of at least 3 times the rated service pressure without rupture. 2-10.1.1 Leakage shall not occur when tested at least 1.1 times the rated service pressure, using an inert gas compatible with industry practices. 2-10.2 Valves of a design that allows the valve stem to be removed without removal of the complete valve bonnet or without disassembly of the valve body shall not be used.

History: 2008 AACS.