CSA/ANSI Z21.18:19 (R2024)/CSA 6.3:19 (R2024)

Preface This is the fourth edition of CSA/ANSI Z21.18 • CSA 6.3, Gas appliance pressure regulators. It supersedes the previous editions published in 2007, 2000, and 1995. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was prepared by the Z21/CSA Joint Technical Subcommittee on Automatic Gas Controls, under the jurisdiction of the Z21/83 Technical Committee on Performance and Installation of Gas- Burning Appliances and Related Accessories and the Strategic Steering Committee on Fuels and Appliances. It has been formally approved by the Z21/83 Technical Committee, and the Technical Committee on Gas Appliances and Related Accessories. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. Scope 1.1 This Standard applies to individual gas appliance pressure regulators, which are not a part of a combination control (see Clause 3, Definitions), constructed entirely of new, unused parts and materials, hereinafter referred to as regulators, intended for application on individual gas appliances. This Standard also applies to negative gas appliance pressure regulators (see Clause 3, Definitions). The performance of negative pressure regulators is covered under Clause 6 of this Standard. Compliance of a device with this Standard does not imply that such device is acceptable for use on gas appliances without supplemental tests with the device applied to the particular appliance design. Components performing functions other than those of a gas appliance pressure regulator comply with the applicable American National Standards. 1.2 This Standard applies to regulators for operations with natural, manufactured and mixed gases, liquefied petroleum gases, and LP gas-air mixtures. 1.3 This standard applies to regulators classified in accordance with their intended application with reference to inlet pressures as follows: Rated inlet pressure: 1/2 psi