塑料管道系统.室外气体装置用多层管道系统.系统规范

[中文适用范围]： 本国际标准规定了基于热塑性塑料管道并用于室外供气的多层管道系统的一般和性能要求。 它提出了由基于热塑性塑料的多层管道组成的管道系统的设计要求，其中至少 60% 的壁厚是聚合物材料。 根据附录 A，用于应力设计层和所有内层的聚合物材料必须为聚乙烯 (PE) 和/或交联聚乙烯 (PE-X)。 金属多层管道的外层必须为 PE 或 PE-X X。 注：就本国际标准而言，PE-RT 被视为 PE，而 PE-X 和粘合层被视为热塑性材料。 本国际标准适用于在 -20 °C 至 40 °C 温度范围内运行的系统。 它适用于这些系统中标称直径不超过 630 毫米的管道，以及 D 类（天然气）和 E 类（液化石油气蒸汽和天然气或液化石油气蒸汽）气体燃料的供应（参见 ISO 13623） 。 [外文原描述]： ISO 18225:2012 specifies general and performance requirements for multilayer pipe systems based on pipes made from thermoplastics and intended to be used for gas supply outdoors. It gives requirements for the design of pipe systems consisting of multilayer pipes based on thermoplastics and for which at least 60 % of the wall thickness is of a polymeric material. The polymeric material used for stress design layers and all inner layers must be polyethylene (PE) and/or crosslinked polyethylene (PE-X), in accordance with Annex A. The outer layers of metal multilayer pipes must be of either PE or PE-X. NOTE For the purposes of ISO 18225:2012, PE-RT is considered as PE, while PE-X and adhesive layers are considered as thermoplastics materials. ISO 18225:2012 is applicable to systems intended to be operated at temperatures ranging from −20 °C to 40 °C. It is applicable to pipes in these systems having a nominal diameter up to and including 630 mm, and to the supply of gaseous fuels of categories D (natural gas) and E (LPG vapour and natural gas or LPG vapour) (see ISO 13623).