UL 971:2ED 2021-05-12
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Nonmetallic Underground Piping For Flammable Liquids
Hardcopy
English
12-05-2021
03-12-2025
This new edition of UL 971 dated May 12, 2021 includes a change in requirements to the Manufacturing and Production Leakage Test in 25.2 and also incorporates editorial changes to include renumbering and reformatting to align with current style.
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Standard
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0
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Underwriters Laboratories
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Superseded
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These requirements cover primary carrier, secondary containment, integral primary/secondary containment, normal vent and vapor recovery, nonmetallic pipe, fittings, and systems (products) intended for use underground in the distribution of petroleum-base flammable and combustible liquids, alcohols, and alcohol-blended fuels as identified in this standard.
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