UL 132:2021 pdf download.STANDARD FOR SAFETY-Safety Relief Valves for Anhydrous Ammonia and LP-Gas.
UL 132 sets forth minimum requirements for safety valves, categorized as pressure-relief valves, safety relief valves and hydrostatic relief valves for anhydrous ammonia and liquefied petroleum gas (LP-Gas). These safety valves are typically installed on tanks built in accordance with ASME Pressure Vessel Code, Section VIII, Division 1, or the Boiler, pressure vessel, and pressure piping code, CSA B51, in nonrefrigerated systems in facilities covered by the applicable Codes and Regulations as determined by the Authority Having Jurisdiction (AHJ) such as:
a) In the United States:
1) Requirements for the Storage and Handling of Anhydrous Ammonia, ANSI/CGA G-2.1;
2) Liquefied Petroleum Gas Code, NFPA 58; and
3) Utility LP-Gas Plant Code, NFPA 59.
b) In Canada:
1) Natural gas code, CSA B149 Series; and
2) Provincial or other Regulations.
1.2 These requirements do not apply to relief valves for use on cylinders constructed in accordance with Department of Transportation (DOT) specifications or to safety valves for use on tanks constructed in accordance with Canadian Transport Commission (CTC) Specifications.
1.3 The suitability of an accessory in combination with a relief valve shall be judged under the applicable requirements of this standard and NFPA 59.
2 Components
2.1 Except as indicated in 2.2, a component of a relief valve covered by this standard shall comply with
the requirements for that component.
2.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.
2.3 A component shall be used in accordance with its rating established for the intended conditions of use.
2.4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.
3 Units of measurement
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.
4 Reference publications
4.1 The documents shown below are referenced in the text of this Standard. Unless otherwise stated elsewhere in this Standard such reference shall be considered to indicate the edition and/or revisions of the document available at the date on which the Committee approved this ULIULC Standard.
UL Standards
UL 746A, Standard for Polymeric Materials — Short Term Property Evaluations
UL 746C, Standard for Polymeric Materials — Use in Electrical Equipment Evaluations
ULIULC Standards :
ANSI/CAN/U LIULC 125, Standard for Safety for Flow Control Valves for Anhydrous Ammonia and LP-Gas
Other Standards
ASME BI .20.1, Pipe Threads, General Purpose (Inch)
ASME/BPVC Sec Vlll-1, Section VIII Division I Rules for Construction of Pressure Vessels.UL 132 pdf download.