CNG CNG Cylider Design Standards and Testing

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compressed natural gas a standard for safety in the early 1990s ngv industry brought together industry stakeholders research organizations and regulatory agencies to start the development of a standard for CNG cylinders the standard was based on existing pressure vessel standards and placed no limitation on materials and methods of construction considered both internal and external container environments and most importantly incorporated a certification process for design manufacturing and quality control the standard an cng v2 is now in its fourth edition at the same time the US Department of Transportation National Highway Traffic Safety Administration published regulations to cover the use of CNG cylinders as vehicle fuel tanks under FMVSS number 304 regulations covering the fuel system integrity in FMV ss 303 will be discussed when we cover crash testing of vehicle fuel systems one of the important design considerations for CNG cylinders is weight reduction especially where large volumes of fuel need to be stored weight reduction of cylinders has been achieved by several means and has led to four type classifications of cylinders the type 1 cylinder is all metal and has achieved weight reduction by using higher strength materials and production technologies composite cylinders use a