UL 58 Steel Tanks
These are all-steel tanks constructed and investigated to UL 58, “Steel Underground Tanks for Flammable and Combustible Liquids,” and are not provided with an external corrosion-protection system investigated by UL. These tank constructions may be primary (single wall) or secondary (double wall) types, and are suitable for containment of general fuels and similar flammable and combustible liquids, as …