Changes to UL 971 Underground Piping Standards

Last Summer PEI's performance requirements went into effect for the "New UL 971" piping standards for nonmetalic underground piping for flammable liquids.  These new requirements cover primary carrier and secondary containment nonmetallic pipe and fittings (piping) intended for use underground in the distribution of petroleum-base flammable and combustible liquids, alcohols, and alcohol-blended fuels.  The scope of UL 971 was revised to clearly indicate that piping systems evaluated to the standard are intended only for underground applications. Excluded were uses in sump, above ground and marine applications. Separate requirements are currently being developed for the excluded applications.  Learn more about UL 971 and the important changes.

PEI has surveyed the UST State Program Managers to see how their state intends to handle "new" and "old" UL 971 listed pipe. We asked each state: Will your state allow piping listed to the 1995 standard to be installed after the new UL 971 requirements become effective (July 1, 2005)?

View Individual States Response