标准编号：ISO 16631:2016
中文名称：输水用球墨铸铁管、管件、附件及其接头与塑料（聚氯乙烯或聚乙烯）管道系统的兼容以及与塑料管道的连接、维修和更换
英文名称：Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE) piping systems, for water applications and for plastic pipeline connections, repair and replacement
发布日期：2016-03
标准范围
This International Standard specifies the requirements and test methods applicable to ductile ironpipes, fittings, accessories and their joints with dimensions compatible with plastic (PVC or PE) pipingsystems:— 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 willmeet or exceed those of plastic pipes. These ductile iron pipes, fittings, accessories and joints can beused along with plastic pipelines, where they are needed (for example, with higher pressure ratingsections, 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 50to DN/OD 225, are compatible with those of plastic pipes (ISO 1452-2 for PVC and ISO 4427-2 forPE). The spigots of plastic pipes used for water applications can be inserted into sockets of pipesmanufactured according to this International Standard. The spigots and sockets of products definedin this International Standard are not dimensionally compatible with the products defined in ISO 2531.This International Standard gives specifications for materials, dimensions and tolerances, mechanicalproperties and standard coatings and linings of pipes, fittings and accessories. It also gives performancerequirements for all components including joints.This International Standard covers pipes, fittings and accessories cast by any type of foundry processor manufactured by fabrication of cast components, as well as corresponding joints in the size rangeDN/OD 50 to DN/OD 225 inclusive.It is applicable to pipes, fittings and accessories which are— manufactured with socketed or spigot ends for jointing by means of various types of gaskets (whichare not within the scope of this International Standard), and— compulsory delivered internally and externally coated.This International Standard is also applicable to socketed fittings which include flanged connections.NOTE In this International Standard, all pressures are relative pressures expressed in bar1).
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