按管(guan)(guan)道(dao)(dao)的(de)公(gong)(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)(li)劃分時，習慣上(shang)將真空管(guan)(guan)道(dao)(dao)與(yu)低壓(ya)(ya)(ya)管(guan)(guan)道(dao)(dao)合并。凡(fan)公(gong)(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)(li)小于2.5MPa的(de)管(guan)(guan)道(dao)(dao)稱(cheng)(cheng)為(wei)(wei)低壓(ya)(ya)(ya)管(guan)(guan)道(dao)(dao)；公(gong)(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)(li)為(wei)(wei)4～6.4MPa的(de)管(guan)(guan)道(dao)(dao)稱(cheng)(cheng)為(wei)(wei)中壓(ya)(ya)(ya)管(guan)(guan)道(dao)(dao)；公(gong)(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)(li)為(wei)(wei)10～100MPa的(de)管(guan)(guan)道(dao)(dao)稱(cheng)(cheng)為(wei)(wei)高壓(ya)(ya)(ya)管(guan)(guan)道(dao)(dao)；公(gong)(gong)稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)(li)大(da)于100MPa的(de)管(guan)(guan)道(dao)(dao)稱(cheng)(cheng)為(wei)(wei)超高壓(ya)(ya)(ya)管(guan)(guan)道(dao)(dao)。

  按管(guan)道(dao)工(gong)作(zuo)(zuo)(zuo)溫(wen)(wen)(wen)(wen)度(du)劃分時，習慣上(shang)將(jiang)在(zai)-40～120℃溫(wen)(wen)(wen)(wen)度(du)范(fan)圍內工(gong)作(zuo)(zuo)(zuo)的(de)(de)管(guan)道(dao)稱為常溫(wen)(wen)(wen)(wen)管(guan)道(dao)；將(jiang)在(zai)120～450℃溫(wen)(wen)(wen)(wen)度(du)范(fan)圍內工(gong)作(zuo)(zuo)(zuo)的(de)(de)管(guan)道(dao)稱為中溫(wen)(wen)(wen)(wen)管(guan)道(dao)；將(jiang)在(zai)高(gao)于450℃溫(wen)(wen)(wen)(wen)度(du)下(xia)工(gong)作(zuo)(zuo)(zuo)的(de)(de)管(guan)道(dao)稱為高(gao)溫(wen)(wen)(wen)(wen)管(guan)道(dao)；將(jiang)工(gong)作(zuo)(zuo)(zuo)于-40℃以下(xia)溫(wen)(wen)(wen)(wen)度(du)環(huan)境的(de)(de)管(guan)道(dao)稱為低溫(wen)(wen)(wen)(wen)管(guan)道(dao)。

某管子分(fen)類不清引起的事故

  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。