ULS – UL 971

Standard for Nonmetallic Underground Piping For Flammable Liquids 1 Scope 1.1 These requirements cover primary carrier, secondary containment, integral primary/secondary containment, normal vent and vapor recovery, nonmetallic pipe, fittings, and

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How many UL tanks standards?

The UL Standards for tanks that store flammable and combustible liquid are: For underground tanks:• UL 58, Steel Underground Tanks for Flammable and Combustible Liquids• UL 1746, External Corrosion Protection

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