CSA/ANSI NGV 5.2:25

Preface This is the third edition of CSA/ANSI NGV 5.2, Vehicle fuelling appliances (VFA) . It supersedes the previous editions published in 2023 and 2017. The following are the major changes to this edition: a) clarification of terms used in definitions; b) added definition for adsorbed natural gas (ANG) appliance; c) added the definition for storage; d) updated the conversion factor for scfm to scmh in Clause 5. There was an error in the original conversion; e) addition of the requirement in Clause 6.6that the unit must be manually restarted after an emergency shutoff device is activated; f) clarification of term for internal storage versus the use of auxiliary or onboard storage as per Clause 6.21.10. The purpose is to provide consistency in the use of these terms; g) added an alternative method of test to simulate a fault detected by a transducer as per Clause 8.7.5.2; h) added requirement within Clause 9.2.1that the user’s manual include safety precautions for service personnel to given high pressure gas within the appliance; i) added requirement in Clause 9.2.3outlining manual restart required when emergency shutoff activated; and j) Clause 11.4outlines the actions which the appliance will undertake when the emergency shut down system is activated. The first edition of CSA/ANSI NGV 5.2 was developed using the requirements in CSA 12.6, Vehicle refuelling appliances; CSA/ANSI NGV 5.1, Residential fuelling appliances; and current code requirements. The CSA NGV 5.2/12.6 Technical Subcommittee reviewed the coverage in CSA 12.6 and CSA/ANSI NGV 5.1 to create a new Standard that would resolve overlapping conflicting requirements and focus on coverage for vehicle fuelling appliances for other than residential applications. The document was designated CSA/ANSI NGV 5.2 to remove potential confusion in the field with equipment marked as complying with CSA 12.6. 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 Vehicle 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 vehicle fuelling appliance (VFA); or b) the vehicle’s activated carbon adsorbents-based adsorbed natural gas (ANG) fuel storage system, referred to as a VFA. This Standard applies to appliances that incorporate compression and dispensing in the same appliance. Notes: 1) Residential fuelling appliances are addressed in CSA/ANSI NGV 5.1. 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 a) intended for natural gas only (see Clause 1.1); b) intended for outdoor or indoor installation; c) intended for ambient temperatures not below −40 °C (−40 °F); d) intended for nominal voltage not exceeding 480 V AC; e) certified as a system with temperature-compensated pressure limits for the delivery of fuel for i) direct fuelling of vehicles; ii) fuelling of vehicles from the system’s internal storage; iii) filling of external natural gas storage systems; or iv) any combination of the above; f) equipped with maximum inlet flow rate not exceeding 10 SCFM (17 SCMH); g) for installation in non-residential occupancies; h) intended to meet installation fire safety requirements in accordance with the requirements of the applicable Code; i) for connection to a single vehicle, multiple vehicles, or storage systems; j) intended for installation in non-hazardous locations; k) for connection to a single or multiple vehicle storage system or external storage systems, with no single storage system having a total capacity of less than 80 L water volume; l) intended for installation in accordance with NFPA 52 or CSA B108.1, where not in conflict with the requirements in this document; and m) an RFA certified to NGV 5.1, which can be considered a VFA if installed in accordance with Item l). These requirements apply only to ANG appliances for use with vehicle or external fuel storage systems 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 nits are both specified as a quoted marking requirement, then 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.