DIN EN 13476-3:2018 非压力地下排水和污水处理用塑料管道系统非增塑聚氯乙烯(PVC-U)、聚丙烯(PP)和聚乙烯(PE)结构壁管道系统 第3部分:光滑管道和配件规范内部和异型外表面以及系统,B 型
Plastics piping systems for non-pressure underground drainage and sewerage – Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) – Part 3: Specifications for pipes and fittings with smooth