Covers safety valves and hydrostatic relief valves for anhydrous ammonia and liquefied petroleum gas (LP-Gas) for use in nonrefrigerated systems in facilities covered by the following standards: (a) Safety Requirements for the Storage and Handling of Anhydrous Ammonia, (ANSI K61.1-1989), ANSI/CGA G-2.1. (b) Standard for the Storage and Handling of Liquefied Petroleum Gases, NFPA 58-1995. (c) Standard for the Storage and Handling of Liquefied Petroleum Gases at Utility Gas Plants, NFPA 59-1995.