CGA C-6.4-2025

Methods for External Visual Inspection of Natural Gas Vehicle (NGV) and Hydrogen Gas Vehicle (HGV) Fuel Containers and Their Installations - Edition 5

This publication provides information and procedures for the periodic visual examination and inspection of natural gas and hydrogen fuel containers and the condition of the installation. These containers are installed in vehicles qualified by the original equipment manufacturer (OEM) or aftermarket vehicle manu-facturer to meet the following U.S. or Canadian standards: CSA/ANSI NGV2, Compressed natural gas vehicle fuel containers; CSA/ANSI HGV 2, Compressed hydrogen gas vehicle fuel containers; U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA) FMVSS, Standard No. 304, Compressed Natural Gas Fuel Container Integrity; Canadian Motor Vehicle Safety Regulations, Standard 301.2, CNG Fuel System Integrity; and Canadian Standards Association (CSA) B51, Boiler, Pressure Vessel, and Pressure Piping Code. The purpose of this publication is to provide guidance for the visual inspection of these containers and to provide criteria for the acceptance or rejection (in the absence of guidance from the manufacturer) with subsequent disposal or repair as necessary.