本标准规定了主要载体、二次安全壳、整体一次/二次、正常通风和蒸汽回收、非金属管道、配件和系统（产品）的最低要求，这些管道、配件和系统（产品）拟用于地下，用于分配本文件中确定的石油基易燃和可燃液体、酒精和酒精混合燃料。在本标准中，易燃和可燃液体指汽油、燃油、煤油和柴油，包括含有少量添加剂的汽油，如洗涤剂、洗涤剂溶剂和防冰化学品；柴油中含有高达5%的生物柴油，汽油中含有高达15%的乙醇或甲基叔丁基醚（MTBE）。本标准涵盖非金属热塑性（柔性）和热固性（刚性）塑料管道，以及制造商提供的配件，仅供地下使用。本标准所涵盖的产品已由合格人员按照制造商的说明在正常土壤应用中进行组装评估。 本标准所涵盖的产品尚未评估用于集水坑（距离集水坑壁超过300 mm）、连接管（地下管道和分配装置之间）、地上或海上用途，或其他环境温度超过23°C的应用。

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.