CSA/ANSI PRD 1:20

Preface This is the third edition of CSA/ANSI PRD 1, Pressure relief devices for natural gas vehicle (NGV) fuel containers. It supersedes the previous editions published in 2013 and 1998. This publication represents a standard for safe operation, substantial and durable construction and performance testing of pressure relief devices (PRD) for natural gas vehicle (NGV) fuel containers, for the on-board storage of compressed natural gas for vehicle operation within limitations given below and in the scope of this Standard. This Standard is based on proven engineering principles, research, and the combined expertise of gas utilities, manufacturers, users, and others having specialized experience. Nothing in this Standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of products which may exceed that specified in the provisions herein. In its preparation, full recognition has been given to possibilities of improvement through ingenuity of design. This Standard is subject to revision as further experience and investigation may show it is necessary and desirable. This Standard does not apply to fuel system components that will be incorporated during original manufacture of motor vehicles which comply with Federal Motor Vehicle Safety Standards (FMVSS) or Canadian Motor Vehicle Safety Standards (CMVSS) for Natural Gas Powered Vehicles. Users of this Standard are advised that the devices/products/activities within its scope may be subject to regulation at the federal, state, or local levels. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this Standard, the federal, state, or local regulations should be followed. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada. 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 General 1.1.1 This Standard establishes minimum requirements for pressure relief devices (PRDs) intended for use on fuel containers that comply with ANSI/CSA NGV2, 49 CFR Part 571.304 (FMVSS 304), CSA B51, Part 2, and/or ISO 11439. PRDs can be of any design or manufacturing method that meets the requirements of this Standard. 1.1.2 This Standard does not apply to reseating or resealing devices. 1.1.3 PRDs designed to comply with this Standard are expected to be used with natural gas fuel containing no more than 2% hydrogen by volume.

Preface This is the third edition of CSA/ANSI PRD 1, Pressure relief devices for natural gas vehicle (NGV) fuel containers. It supersedes the previous editions published in 2013 and 1998. This publication represents a standard for safe operation, substantial and durable construction and performance testing of pressure relief devices (PRD) for natural gas vehicle (NGV) fuel containers, for the on-board storage of compressed natural gas for vehicle operation within limitations given below and in the scope of this Standard. This Standard is based on proven engineering principles, research, and the combined expertise of gas utilities, manufacturers, users, and others having specialized experience. Nothing in this Standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of products which may exceed that specified in the provisions herein. In its preparation, full recognition has been given to possibilities of improvement through ingenuity of design. This Standard is subject to revision as further experience and investigation may show it is necessary and desirable. This Standard does not apply to fuel system components that will be incorporated during original manufacture of motor vehicles which comply with Federal Motor Vehicle Safety Standards (FMVSS) or Canadian Motor Vehicle Safety Standards (CMVSS) for Natural Gas Powered Vehicles. Users of this Standard are advised that the devices/products/activities within its scope may be subject to regulation at the federal, state, or local levels. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this Standard, the federal, state, or local regulations should be followed. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada. 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 General 1.1.1 This Standard establishes minimum requirements for pressure relief devices (PRDs) intended for use on fuel containers that comply with ANSI/CSA NGV2, 49 CFR Part 571.304 (FMVSS 304), CSA B51, Part 2, and/or ISO 11439. PRDs can be of any design or manufacturing method that meets the requirements of this Standard. 1.1.2 This Standard does not apply to reseating or resealing devices. 1.1.3 PRDs designed to comply with this Standard are expected to be used with natural gas fuel containing no more than 2% hydrogen by volume.