Preface 

This is the third edition of CSA/ANSI NGV 4.2, Hose and hose assemblies for compressed natural gas (CNG) dispensing systems for natural gas vehicles (NGV). It supersedes the previous editions published in 2014 as CSA/ANSI NGV 4.2 • CSA 12.52, Hoses for natural gas dispensing systems, and in 1999 as ANSI/IAS NGV 4.2 • CSA 12.52, Hoses for natural gas vehicles and dispensing systems. Major changes to this edition include: • addition of bulk hose to the Scope; • added bulk hose testing requirements; • clarification about when testing is to be conducted with hose only or hose assemblies; and • updated gas composition references to ASTM D8080. This publication represents a Standard for the safe operation, substantial and durable construction, and performance testing of hose and hose assemblies used for natural gas dispensing systems for natural gas vehicles (NGV), within limitations given 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 might 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 might show it is necessary and desirable. Users of this Standard are advised that the devices/products/activities within its scope might be subject to regulation at the federal, state, provincial, or local levels. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this Standard, federal, state, provincial, 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 is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was prepared by the Subcommittee on Hoses for Natural Gas Vehicle Dispensing Systems, under the jurisdiction of the Technical Committee on Natural Gas Transportation and the Strategic Steering Committee on Transportation. It has been formally approved by the Technical Committee and by the Interprovincial/Territorial Gas Advisory Council (IGAC). 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 was approved by the American National Standards Institute (ANSI) as an American National Standard. 

Scope 

1.1 Inclusions 

This Standard establishes requirements for newly manufactured compressed natural gas hose and hose assemblies, intended for use in natural gas dispensing stations. Hose assemblies may be categorized by the following classes: a) Class A – hose assembly connecting the dispenser to the fuelling nozzle; and b) Class D – hose assemblies used on other station equipment. Note: Refer to CSA/ANSI NGV 3.1 Part 22 for vehicle hoses. The requirements of this Standard may be superseded by an application-specific standard. Hose assemblies certified under this Standard may be assembled at either the point of manufacture of the hose, or at hose assembly facilities authorized by the hose manufacturer. Annex A provides clarification of the applicability of each Clause in this Standard to each class of hose assemblies. 

1.2 Exclusions 

This Standard does not apply to hoses with a working pressure of less than 13.8 kPa (2 psi). This Standard does not apply to natural gas onboard vehicle hoses covered by CSA NGV 3.1. 

1.3 Terminology 

In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 

1.4 Units of measure 

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. All references to pressure throughout this document are to be considered gauge pressures unless otherwise specified.