按管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)的公(gong)(gong)稱(cheng)壓力(li)(li)劃分時(shi)，習(xi)慣上(shang)將(jiang)真空管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)與(yu)低壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)合并。凡公(gong)(gong)稱(cheng)壓力(li)(li)小于2.5MPa的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)低壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)；公(gong)(gong)稱(cheng)壓力(li)(li)為(wei)(wei)4～6.4MPa的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)中壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)；公(gong)(gong)稱(cheng)壓力(li)(li)為(wei)(wei)10～100MPa的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)高壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)；公(gong)(gong)稱(cheng)壓力(li)(li)大于100MPa的管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)超高壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)。

  按管(guan)道工(gong)作(zuo)溫(wen)度(du)(du)劃分時，習慣上將(jiang)在-40～120℃溫(wen)度(du)(du)范圍內(nei)(nei)工(gong)作(zuo)的(de)(de)管(guan)道稱(cheng)(cheng)(cheng)為常溫(wen)管(guan)道；將(jiang)在120～450℃溫(wen)度(du)(du)范圍內(nei)(nei)工(gong)作(zuo)的(de)(de)管(guan)道稱(cheng)(cheng)(cheng)為中溫(wen)管(guan)道；將(jiang)在高(gao)于450℃溫(wen)度(du)(du)下(xia)工(gong)作(zuo)的(de)(de)管(guan)道稱(cheng)(cheng)(cheng)為高(gao)溫(wen)管(guan)道；將(jiang)工(gong)作(zuo)于-40℃以下(xia)溫(wen)度(du)(du)環境的(de)(de)管(guan)道稱(cheng)(cheng)(cheng)為低溫(wen)管(guan)道。

某管子分(fen)類不清(qing)引起的事故

  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。