HG 20225《化(hua)工(gong)金(jin)屬管(guan)道(dao)(dao)(dao)工(gong)程施工(gong)及(ji)驗收規(gui)范》規(gui)定化(hua)工(gong)行業金(jin)屬管(guan)道(dao)(dao)(dao)應按(an)管(guan)道(dao)(dao)(dao)所輸送(song)(song)的介(jie)質分為(wei)(wei)四類(lei)(lei):A類(lei)(lei)為(wei)(wei)輸送(song)(song)劇毒(du)介(jie)質的管(guan)道(dao)(dao)(dao);B類(lei)(lei)為(wei)(wei)輸送(song)(song)可燃介(jie)質或有毒(du)介(jie)質的管(guan)道(dao)(dao)(dao);C類(lei)(lei)、D類(lei)(lei)為(wei)(wei)輸送(song)(song)非可燃介(jie)質、無毒(du)介(jie)質的管(guan)道(dao)(dao)(dao)。其中設計壓力p≤1MPa,且設計溫度為(wei)(wei)-29~186℃的管(guan)道(dao)(dao)(dao)為(wei)(wei)D類(lei)(lei)管(guan)道(dao)(dao)(dao)。
注意:混(hun)合物料(liao)應(ying)以其主(zhu)導物料(liao)作為分(fen)級依據。常(chang)見劇毒介質、可燃介質或有毒介質,請(qing)參考(kao)《化(hua)工(gong)金屬管道工(gong)程(cheng)施工(gong)及驗收規(gui)范》的附(fu)錄。