["PVC-F法兰 Standardnorm",,"Wir müssen nun einen einen-泵送系统设计，管道都是PVC-U的，采用法兰连接。不知道法兰采用什么国家标准？不知道法兰厚度如何计算螺栓长度？","GB/T 给水用硬聚氯乙烯(PVC-U)管件，有法兰接头。","Anwendungsgebiet stimmt nicht. 目前PVC-U 管件尺寸都是企业标准，规范可以套用GB 4219.1。","化工用硬聚氯乙烯管件 GB 4218484 用工业级的吧 不到多少钱","HG G559G 不是 钁制管法兰么 PVC的不在这个范围内吧？"]

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