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These requirements cover horizontal atmospheric-type steel tanks intended for the storage underground of flammable and combustible liquids.

These requirements cover single wall tanks, secondary containment tanks, multiple compartment single wall and multiple compartment secondary containment tanks.

These tanks are intended for installation and use in accordance with the Standard for the Installation of Oil-Burning Equipment, NFPA 31, the Flammable and Combustible Liquids Code, NFPA 30, the Automotive and Marine Service Station Code, NFPA 30A, and the Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, NFPA 37, and the Uniform Fire Code, published by the International Fire Code Institute.

Tanks covered by these requirements are cylindrical tanks that are fabricated, inspected, and tested for leakage before shipment from the factory as completely assembled vessels.