ISO 16631:2016规定了适用于尺寸与塑料（PVC或PE）管道系统兼容的球墨铸铁管、配件、附件及其接头的要求和试验方法: -更换或修复现有塑料管道； -输送水（例如供人类饮用的水、原水等）； -有压力或无压力操作； -安装在地下或地上； -根据其外径定义（DN/OD系列）； -根据压力分类（C级）。 本国际标准规定的压力等级为C25。该耐压水平将达到或超过塑料管的耐压水平。这些球墨铸铁管、配件、附件和接头可与塑料管道一起使用，如果需要（例如，具有更高的额定压力段、更高的交通负荷等）。 )，用于建造水管。 根据本国际标准，尺寸范围为DN/OD 50至DN/OD 225的产品尺寸与塑料管的尺寸（PVC为ISO 1452？2，PE为ISO 4427？2）兼容。用于水应用的塑料管的插口可以插入根据本国际标准制造的管道插座中。本国际标准中定义的产品插口和插座在尺寸上与ISO 2531中定义的产品不兼容。 ISO 16631:2016给出了管道、配件和附件的材料、尺寸和公差、机械性能以及标准涂层和衬里的规范。 它还提供了包括接头在内的所有部件的性能要求。 ISO 16631:2016涵盖通过任何类型的铸造工艺铸造或通过铸造组件制造制造的管道、配件和附件，以及尺寸范围为DN/OD 50至DN/OD 225（含）的相应接头。 ISO 16631:2016适用于以下管道、配件和附件: -使用各种类型的垫圈（不在本国际标准范围内）连接的承插或插口端制造，以及 -强制交付内部和外部涂层。 ISO 16631:2016也适用于包括法兰连接的承插配件。 注:在本国际标准中，所有压力均为相对压力，单位为巴[1]。 [1] 100 kPa1巴。

ISO 16631:2016 specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints with dimensions compatible with plastic (PVC or PE) piping systems: - to replace or repair existing plastic pipelines; - to convey water (e.g. for human consumption, raw water, etc.); - operated with or without pressure; - installed below or above ground; - defined according to their external diameter (DN/OD series); - classified according to pressure (C class). The pressure class specified in this International Standard is C25. This pressure resistance level will meet or exceed those of plastic pipes. These ductile iron pipes, fittings, accessories and joints can be used along with plastic pipelines, where they are needed (for example, with higher pressure rating sections, higher traffic load, etc.), for the construction of water pipelines. The dimensions of the products according to this International Standard, in the size range DN/OD 50 to DN/OD 225, are compatible with those of plastic pipes (ISO 1452？2 for PVC and ISO 4427？2 for PE). The spigots of plastic pipes used for water applications can be inserted into sockets of pipes manufactured according to this International Standard. The spigots and sockets of products defined in this International Standard are not dimensionally compatible with the products defined in ISO 2531. ISO 16631:2016 gives specifications for materials, dimensions and tolerances, mechanical properties and standard coatings and linings of pipes, fittings and accessories. It also gives performance requirements for all components including joints. ISO 16631:2016 covers pipes, fittings and accessories cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints in the size range DN/OD 50 to DN/OD 225 inclusive. ISO 16631:2016 is applicable to pipes, fittings and accessories which are - manufactured with socketed or spigot ends for jointing by means of various types of gaskets (which are not within the scope of this International Standard), and - compulsory delivered internally and externally coated. ISO 16631:2016 is also applicable to socketed fittings which include flanged connections. NOTE In this International Standard, all pressures are relative pressures expressed in bar[1]. [1] 100 kPa = 1 bar.