UL 132:2021 PDF Download

UL 132:2021 standard covers the minimum requirements for pressure-relief valves, safety relief valves and hydrostatic relief valves for anhydrous ammonia and liquefied petroleum gas (LP-Gas). These valves are typically installed on tanks built in accordance with ASME Pressure Vessel Code, Section VIII, Division 1, or CSA B51 in non-refrigerated systems in facilities covered by the relevant Codes and Regulations determined by the Authority Having Jurisdiction (AHJ). These include the Requirements for the Storage and Handling of Anhydrous Ammonia, ANSI/CGA G-2.1, Liquefied Petroleum Gas Code, NFPA 58, Utility LP-Gas Plant Code, NFPA 59, and Provincial or other Regulations in Canada.

It is important to note that relief valves for use on cylinders constructed in accordance with Department of Transportation (DOT) specifications or safety valves for use on tanks constructed in accordance with Canadian Transport Commission (CTC) specifications are not covered by this standard. Any accessory used in combination with the relief valve must meet the applicable requirements of UL 132:2021 and NFPA 59. This standard is designed to ensure the safe use and operation of safety relief valves for anhydrous ammonia and LP-Gas.