按(an)管(guan)道(dao)的(de)(de)公(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)劃分時(shi)，習慣(guan)上將真空管(guan)道(dao)與低(di)壓(ya)(ya)(ya)管(guan)道(dao)合(he)并。凡公(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)小(xiao)于(yu)2.5MPa的(de)(de)管(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)低(di)壓(ya)(ya)(ya)管(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)為(wei)(wei)(wei)4～6.4MPa的(de)(de)管(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)中壓(ya)(ya)(ya)管(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)為(wei)(wei)(wei)10～100MPa的(de)(de)管(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)高壓(ya)(ya)(ya)管(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)大于(yu)100MPa的(de)(de)管(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)超高壓(ya)(ya)(ya)管(guan)道(dao)。

  按(an)管(guan)道工(gong)作(zuo)溫(wen)度(du)劃分時，習慣上將(jiang)(jiang)在(zai)-40～120℃溫(wen)度(du)范(fan)圍內工(gong)作(zuo)的(de)管(guan)道稱為常溫(wen)管(guan)道；將(jiang)(jiang)在(zai)120～450℃溫(wen)度(du)范(fan)圍內工(gong)作(zuo)的(de)管(guan)道稱為中溫(wen)管(guan)道；將(jiang)(jiang)在(zai)高于450℃溫(wen)度(du)下工(gong)作(zuo)的(de)管(guan)道稱為高溫(wen)管(guan)道；將(jiang)(jiang)工(gong)作(zuo)于-40℃以下溫(wen)度(du)環境的(de)管(guan)道稱為低(di)溫(wen)管(guan)道。

某管子分類不(bu)清引(yin)起的(de)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。