按(an)管道的(de)公(gong)稱(cheng)(cheng)壓(ya)(ya)力劃分(fen)時(shi)，習慣(guan)上將真空管道與低(di)壓(ya)(ya)管道合并。凡(fan)公(gong)稱(cheng)(cheng)壓(ya)(ya)力小于(yu)2.5MPa的(de)管道稱(cheng)(cheng)為(wei)低(di)壓(ya)(ya)管道；公(gong)稱(cheng)(cheng)壓(ya)(ya)力為(wei)4～6.4MPa的(de)管道稱(cheng)(cheng)為(wei)中壓(ya)(ya)管道；公(gong)稱(cheng)(cheng)壓(ya)(ya)力為(wei)10～100MPa的(de)管道稱(cheng)(cheng)為(wei)高(gao)壓(ya)(ya)管道；公(gong)稱(cheng)(cheng)壓(ya)(ya)力大于(yu)100MPa的(de)管道稱(cheng)(cheng)為(wei)超高(gao)壓(ya)(ya)管道。

  按管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)工(gong)作溫(wen)(wen)(wen)度劃(hua)分時(shi)，習慣(guan)上將(jiang)在(zai)-40～120℃溫(wen)(wen)(wen)度范圍(wei)內工(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)常溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將(jiang)在(zai)120～450℃溫(wen)(wen)(wen)度范圍(wei)內工(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)中溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將(jiang)在(zai)高于450℃溫(wen)(wen)(wen)度下工(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)高溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將(jiang)工(gong)作于-40℃以下溫(wen)(wen)(wen)度環境(jing)的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)低溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)(dao)。

某管子分類不清引起的事故(gu)

  某工程DN2000的火炬氣管子，GB/T9711.2標準的L245有縫管子。因為含苯的比例較大，按照規范應該進行100％焊縫無損檢驗。設計初衷是訂購GB/T 9711.2標準的直縫鋼管，需要檢驗的焊縫長度會比螺縫鋼管短。但是，在訂貨材料單的描述內沒有寫清楚是GB/T 9711.2標準的直縫鋼管還是GB/T9711.2標準的螺縫鋼管，結果到施工現場的是600m符合GB/T 9711.2標準的螺縫鋼管，增加了額外的無損檢測，給工程造成了很大的額外支出。