ISO 14531-3:2010规定了用于连接符合ISO 14531-1要求的交联聚乙烯（PE？X）管道以及用于将PE？X管道连接到具有普通插口、螺纹、，压缩插座和法兰终端。此外，它还规定了尺寸要求，并规定了一些一般材料特性（包括耐化学性），以及以管道形式生产的PE？X管件材料的分类方案。 ISO 14531-3:2010与ISO 14531的其他部分一起使用时，为供应D类和E类碳氢燃料的PE？X管道系统（PE？X管道、PE？X熔合配件和机械配件）的设计、制造和安装提供了依据。

ISO 14531-3:2010 specifies the physical properties and mechanical-performance requirements for full-end-load-resistant mechanical fittings for use in the connection of crosslinked polyethylene (PE？X) pipes conforming to ISO 14531？1 and in the construction of transition assemblies for joining PE？X pipes to metal pipes having plain spigot, screw thread, compression socket and flange terminations. In addition, it lays down dimensional requirements and specifies some general material properties (including chemical resistance) together with a classification scheme for PE？X fitting materials produced in the form of pipe. ISO 14531-3:2010, when used in conjunction with the other parts of ISO 14531, provides the basis for the design, manufacture and installation of PE？X piping systems (PE？X pipes, PE？X fusion fittings and mechanical fittings) for the supply of category D and category E hydrocarbon-based fuels.