CSA/ANSI NGV 5.1:25

Preface This is the fourth edition of CSA/ANSI NGV 5.1, Residential fuelling appliances (RFA) . It supersedes the previous editions published in 2023, 2016, and 2015. The following are the major changes to this edition: a) clarified terms used in definitions; b) clarified emergency shutoff requirements (Clauses 6.6, 9.2.3, and 11.4) with the addition of the requirement in Clause 6.6 that the unit must be manually restarted after an emergency shutoff device is activated; c) added an alternative method of test to simulate a fault detected by a transducer and updated test method for shutdown (Clause 8.6.5.2); d) clarified the operational requirement for a breakaway device (Clause 8.9.6); e) added a reference to the use of the CSA/ANSI NGV 4.3 for temperature compensation requirements; f) added requirements that the user’s manual include safety precautions for service personnel related to high pressure gas within the appliance; and g) harmonized coverage to the extent possible with CSA/ANSI NGV 5.2. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada. This Standard was prepared by the Subcommittee on Refuelling Appliances for Natural Gas Vehicles, under the jurisdiction of the Technical Committee on Natural Gas Transportation and the Strategic Steering Committee on Transportation, and has been formally approved by the Technical Committee. 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 This Standard details the mechanical, physical, and electrical requirements for a newly manufactured appliance that compresses natural gas for vehicles and dispenses directly into a) the vehicle natural gas fuel storage system, referred to as a residential fuelling appliance (RFA); or b) the vehicle’s activated carbon adsorbents-based adsorbed natural gas (ANG) fuel storage system, referred to as an RFA. This Standard applies to appliances that incorporate compression and dispensing in the same appliance. Notes: 1) Vehicle fuelling appliances are addressed in CSA/ANSI NGV 5.2. 2) Mobile fuelling appliances are addressed in CSA/ANSI NGV 5.3. 3) Devices dedicated only to dispensing fuel into vehicles are addressed in CSA/ANSI NGV 4.1. 1.2 Application This Standard applies to all appliances that are intended a) for natural gas only (see Clause 1.1); b) for outdoor or indoor installation in non-living spaces (e.g., garage); c) for ambient temperature not below −40 °C (−40 °F); d) for nominal voltage not exceeding 240 V AC; e) for fill pressure not exceeding the specified vehicle service pressure; f) for flow rates per Clause 5of this Standard; g) for connection to residential utility gas piping systems in accordance with the requirements of the applicable Code; h) to meet installation fire safety requirements in accordance with the requirements of the applicable Code; i) for single and dual fuelling hose gas compressor packages; and j) for installation in accordance with NFPA 52 or CSA B108.1 where not in conflict with the requirements in this Standard. These requirements apply only to ANG appliances for use with vehicles that contain activated carbon- adsorbent material with a maximum developed pressure/rated charging pressure ratio less than or equal to 1.5, and that have a service pressure of 6205 kPa (900 psig). 1.3 Pressure references All references to "kPa" and "psig" throughout this Standard are to be considered gauge pressures unless otherwise specified. 1.4 Resolution of conflicts In the case of conflict between this Standard and federal, national, provincial/territorial, state, or local requirements, the requirements of the authority having jurisdiction take precedence. 1.5 Alternate construction The requirements of this Standard are not intended to constrain innovation. When considering fuels, materials, designs, or constructions not specifically dealt with in this Standard, these alternatives may be evaluated as to their ability to yield levels of safety and performance equivalent to those prescribed by this Standard. 1.6 "Fuelling" and "refuelling", and "park" and "store" The terms "fuelling" and "refuelling" are used interchangeably in this Standard. The terms "park" and "store" and all derivatives thereof are used interchangeably in this Standard. 1.7 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. 1.8 Units of measurement 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. Notes: 1) If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit or both are to be provided. 2) IEEE/ASTM SI 10 or ISO 80000-1 is used as a guide in making metric conversion from inch/pound quantities.