1. Awọn paipu irin welded fun gbigbe omi titẹ kekere (GB/T3092-1993) ni a tun pe ni awọn paipu welded gbogbogbo, ti a mọ ni awọn paipu dudu.O jẹ paipu irin welded fun gbigbe awọn fifa titẹ isalẹ gbogbogbo gẹgẹbi omi, gaasi, afẹfẹ, epo ati nya alapapo ati awọn idi miiran.Awọn paipu irin jẹ ...
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