UL 971-21 Nonmetallic underground piping for flammable liquids
Publication Year
2021
Document Status
Current
Abstract
Specifies primary carrier, secondary containment, integral primary/secondary containment, normal vent and vapor recovery, nonmetallic pipe, fittings, and systems for use underground in the distribution of petroleum-base flammable and combustible liquids, alcohols, and alcohol-blended fuels.
Publisher Information
Underwriters Laboratories
Established in 1894 as the Underwriters' Electrical Bureau, UL is a global safety consulting and certification company, approved to perform safety testing by the U.S. federal agency of Occupational Safety and Health Administration.
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