DIN EN 13476-3:2020 无压地下排水和污水塑料管系统. 未增塑聚氯乙烯(PVC-U)、聚丙烯(PP)和聚乙烯(PE)结构壁管系统. 第3部分: B型、有平滑内外表面的管和配件及系统用规范; 德文版本EN 13476-3-2018+A1-2020
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