压力和非压力管道用球墨铸铁管及配件

[中文适用范围]： 该文件规定了 ISO 2531、ISO 7186 和 ISO 16631 定义的压力和非压力管道用球墨铸铁管和管件水泥砂浆内衬的性质、使用方法、表面状况、性能要求和最小厚度。它涵盖了用于改善管道和管件（与无衬里管道和管件相比）的液压性能和/或防止腐蚀损坏的水泥砂浆衬里，并包括部分填充的重力下水道衬里的特殊要求。它还涵盖了用于输送特别腐蚀性流体的衬里，其中可以单独或组合使用以下解决方案：a)增加衬里厚度；b)改变水泥类型；c)在衬里上涂层。 [外文原描述]： This document specifies the nature, the method of application, the surface condition, performance requirements and the minimum thickness of internal linings of cement mortar for ductile iron pipes and fittings for pressure and non-pressure pipelines as defined in ISO 2531, ISO 7186 and ISO 16631. It covers cement mortar linings which are used to improve the hydraulic properties of pipes and fittings compared to un-lined pipes and fittings and/or to prevent corrosion damage and includes special requirements for linings of gravity sewers operating partially filled. It also covers linings used for the conveyance of particularly aggressive fluids, where the following solutions can be used either separately or in combination: a) an increase in the thickness of the lining; b) a change of the type of cement; c) a coating over the lining.