Nonmetallic Underground Piping For Flammable Liquids

Available format(s)

Hardcopy

Language(s)

English

Published date

12-05-2021

Publisher

Underwriters Laboratories

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.

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.