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Storage and handling of liquefied petroleum
Containers designed, constructed, and tested prior to J , according to the Code for Unfired Pressure Vessels for Petroleum Liquids and Gases, 1951 edition with 1954 Addenda, of the American Petroleum Institute and the American Society of Mechanical Engineers, which is incorporated by reference as specified in Sec. 1910.6, shall be considered in conformance.

Autogas Wikipedia
Autogas is the common name for liquefied petroleum gas (LPG) when it is used as a fuel in internal combustion engines in vehicles as well as in stationary applications such as is a mixture of propane and butane.. Autogas is widely used as a "green" fuel, as its use reduces CO 2 exhaust emissions by around 15% compared to litre of petrol produces 2.3 kg of CO