• Familiarization with key terms associated with LPGs can help employers and employees avoid associated hazards.

It is important to recognize and be familiar with key terms and definitions related to liquified petroleum gas (LPG) so that potential hazards are understandable and clear.

• API-ASME container: A container designed, constructed, and tested in accordance with the Rules for Construction of Unfired Pressure Vessels, section VIII, Division 1, American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, 1968 edition, which is incorporated by reference as specified in Sec. 1910.6.
• Approved: Unless otherwise indicated, listing or approval by a nationally recognized testing laboratory. Refer to 1910.7 for definition of nationally recognized testing laboratory.
• Container assembly: An assembly consisting of the container and fittings for all container openings, including shutoff valves, excess flow valves, liquid-level gaging devices, safety relief devices, and protective housing.
• Containers: All vessels, such as tanks, cylinders, or drums used for transportation or storing LPGs.
• DOT: Department of Transportation.
• DOT container: A container constructed in accordance with the applicable requirements of 49 CFR Chapter 1 (DOT Specifications).
• DOT cylinders: Cylinders meeting the requirements of 49 CFR Chapter I (DOT Specifications).
• DOT Specifications: Regulations of the Department of Transportation published in 49 CFR Chapter I.
• Liquefied petroleum gases (LPG and/or LP-Gas): Any material which is composed predominantly of any of the following hydrocarbons or mixtures of them: propane, propylene, butanes (normal butane or iso-butane), and butylenes.
• Listed: Unless otherwise indicated, listing or approval by a nationally recognized testing laboratory. Refer to 1910.7 for definition of nationally recognized testing laboratory.
• Movable fuel storage tenders or farm carts: Containers not in excess of 1,200 gallons water capacity that are equipped with wheels to be towed from one location of usage to another. These are nonhighway vehicles, but may occasionally be moved over public roads or highways. They are used as a fuel supply for farm tractors, construction machinery, and similar equipment.
• P.S.I.G.: Pounds per square inch gauge.
• P.S.I.A.: Pounds per square inch absolute.
• Systems: An assembly of equipment consisting of the container or containers, major devices such as vaporizers, safety relief valves, excess flow valves, regulators, and piping connecting such parts.
• Vaporizer (burner): An integral vaporizer-burner unit that is dependent upon the heat generated by the burner to vaporize the liquid used for dehydrators or dryers.
• Ventilation (adequate): When specified for the prevention of fire during normal operation, ventilation shall be considered adequate when the concentration of the gas in a gas-air mixture does not exceed 25 percent of the lower flammable limit.