liquefied petroleum gases (liq•ue•fied pe•tro•le•um gas•es)

1. fuel gases, including commercial propane (predominately propane and/or propylene) or commercial butane (predominately butane, isobutane, and/or butylene). 2. liquefied petroleum gas supplied in cylinders and used without liquid vaporizers must be either commercial propane or butane as defined above in order to avoid major variations in heating value of the gas as it is released from the cylinder. 
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