UL Standard for Safety Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia@ LP-Gas@ and Propylene (Tenth Edition; Reprint with revisions through and including January 10@ 2014)
These requirements cover power-operated pumps and bypass valves for use in liquid transfer operations in non-refrigerated systems in installations for: a) Anhydrous ammonia systems installed in accordance with the Safety Requirements for the Storage and Handling of Anhydrous Ammonia@ CGA/GAS G-2.1 (ANSI K61.1); b) Liquefied petroleum gas (LP-Gas) systems installed in accordance with the Liquefied Petroleum Gas Code@ NFPA No. 58; and c) Propylene systems. These requirements do not cover: a) Pumps or compressors intended for handling anhydrous ammonia or LP-Gas or propylene in the gaseous phase and b) Pumps@ compressors or bypass valves for anhydrous ammonia@ LP-Gas@ or propylene for use in chemical@ petro-chemical@ petroleum@ or utility power plants; nor pipeline or marine terminals; nor related storage facilities at such plants or terminals. Equipment covered by these requirements is for use with LP-Gas@ propylene@ or anhydrous ammonia as covered by the Standards and Codes in 1.1 and shall have a minimum service pressure rating in accordance with Table Exception: A pump without an integral bypass valve with a higher differential pressure obtained in the Differential Pressure Test@ Section 17@ is permitted to have a lower minimum service pressure rating if it is marked in accordance with 25.2.