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UL 51 10th Edition, May 18, 2015
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UL Standard for Safety Power-Operated Pumps and Bypass Valves for Anhydrous Ammonia, LP-Gas, and Propylene
Includes all amendments and changes through Revision Page(s) , May 18, 2015
Published By:UL (UL)
Page Count:28
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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 1.1.