ULC 660

This Standard sets forth minimum requirements for primary carrier, secondary containment, integral primary/secondary, normal vent and vapour recovery, nonmetallic pipe, fittings, and systems (products) intended for use underground for the distribution of petroleum-base flammable and combustible liquids, alcohols, and alcohol-blended fuels as identified in this document. For the purpose of this Standard, flammable and combustible liquids mean gasoline, fuel oil, kerosene and diesel fuel, including gasoline with small amounts of additives such as detergents, solvents for detergents and anti-icing chemicals; diesel with up to 5% biodiesel and gasoline with up to 15% ethanol or methyl tertiary butyl ether (MTBE).This Standard covers nonmetallic thermoplastic (flexible) and thermoset (rigid) plastic piping with manufacturer-supplied fittings for underground use only. The products covered by this Standardhave been evaluated for assembly in normal soil applications by qualified persons in accowith the manufacturer’s instructions.The products covered by this Standard have not been evaluated for applications in sumps [more than 300 mm from sump wall], as connector pipe (between underground pipe and dispensing device), aboveground or marine use, or other applications exceeding ambient temperatures of 23 °C.