ANSI/CAN/UL/ULC 252:2023

1 Scope 1.1 These minimum requirements cover regulators used to reduce the pressure of compressed industrial gases from a source or storage cylinder pressure of not more than 5500 psig (37.91 MPa) to the use pressure. 1.2 Regulators covered by these requirements are intended for use with compressed gases such as air, carbon dioxide, inert gases, fuel gases, nitrogen, nitrogen oxide, and oxygen. 1.3 Products covered by this Standard are intended to be installed and used in accordance with the applicable Codes and Regulations as determined by the Authority Having Jurisdiction (AHJ), such as, but not limited to: In the United States: a) The Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, NFPA 51; b) Occupational Safety and Health Administration (OSHA) 29 CFR 1926.350 – Gas welding and cutting. In Canada: a) Safety in welding, cutting, and allied processes, CSA W117.2. 1.4 Regulators for welding, cutting, and heating operations are intended for use in accordance with the Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, NFPA 51, or Safety in Welding, Cutting, and Allied Processes, CSA W117.2. Refer to Annex A. 1.5 These requirements do not cover: a) Liquified Petroleum Gas (LP-Gas) pressure regulators for equipment intended for installation and use in accordance with requirements of the Liquefied Petroleum Gas Code, NFPA 58, or the Natural Gas and Propane Installation Code, CSA B149.1. Refer to the Standard for LP-Gas Regulators, UL/ULC 144. b) Regulators for handling liquids under cryogenic temperatures. c) The regulating performance flow characteristics of the regulator, and the physiological effects of regulators to be used with medical gases. NOTE: For the purposes of this standard the terms “LP-Gas” and “Propane” are interchangeable.