Interpretation in this Part

In this Part, unless the context otherwise requires, “bob-tail delivery truck” means any pressurised container truck used for the distribution of liquified petroleum gases; “fixed installation tank” means a container of liquified petroleum gases which is fixed and designed not to hold more than one thousand gallons of liquified petroleum gases; “liquified petroleum gases” means any liquified gases consisting predominantly of C-3 and C-4 hydrocarbons which exist as gases under normal temperatures and pressures, but which become liquified under moderately high pressures, and includes commercial butane, propane, and a mixture of both butane and propane.