UL 51:2018

$98.80

Standard for Power-Operated Pumps for Anhydrous Ammonia and LP-Gas

Published By	Publication Date	Number of Pages
UL	2018-10-05	31

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Category: UL

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Description

1 Scope

1.1 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.

1.2 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.

1.3 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.

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.

Table 1.1 – Minimum service pressure for rating pumps and bypass valves

Maximum differential pressure produced when subjected to the Differential Pressure Test, Section 17	Anhydrous ammonia and LP-Gas equipment minimum service pressure rating	Propylene equipment minimum service pressure rating
psig (kPa)	psig (kPa)	psig (kPa)
= 100 (689) Propylene equipment only	Not applicable	350 (2415)
= 125 (862)	350 (2415)	375 (2585)
>125 (863) = 150 (1034)	375 (2586)	400 (2758)
>150 (1034) = 200 (1379)	400 (2758)	425 (2930)
= 200 (1379)	200 + differential pressure produced (1379 + differential pressure produced)	225 + differential pressure produced (1551 + differential pressure produced)