Installation systems for gas installation inside buildings, consisting of multi-layer composite pipes and their corresponding fittings, for an operating pressure <kleiner => 100 mbar - Part 3: Conformity assessment for the use of alternative pipe materials; Text in German and English
工作压力为100 mbar的由多层复合管及其相应配件组成的建筑物内气体安装用安装系统.第3部分:替代管道材料使用的合格评定;德语和英语文本