按管(guan)(guan)道(dao)的公(gong)稱(cheng)(cheng)壓(ya)(ya)力劃分時，習慣上將(jiang)真空管(guan)(guan)道(dao)與(yu)低壓(ya)(ya)管(guan)(guan)道(dao)合并。凡公(gong)稱(cheng)(cheng)壓(ya)(ya)力小于2.5MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)低壓(ya)(ya)管(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)力為(wei)4～6.4MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)中壓(ya)(ya)管(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)力為(wei)10～100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)高壓(ya)(ya)管(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)(ya)力大于100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)超高壓(ya)(ya)管(guan)(guan)道(dao)。

  按管(guan)(guan)道(dao)工作(zuo)溫(wen)度(du)(du)劃分時(shi)，習慣上將(jiang)在(zai)-40～120℃溫(wen)度(du)(du)范圍內工作(zuo)的管(guan)(guan)道(dao)稱(cheng)為常溫(wen)管(guan)(guan)道(dao)；將(jiang)在(zai)120～450℃溫(wen)度(du)(du)范圍內工作(zuo)的管(guan)(guan)道(dao)稱(cheng)為中溫(wen)管(guan)(guan)道(dao)；將(jiang)在(zai)高于450℃溫(wen)度(du)(du)下工作(zuo)的管(guan)(guan)道(dao)稱(cheng)為高溫(wen)管(guan)(guan)道(dao)；將(jiang)工作(zuo)于-40℃以下溫(wen)度(du)(du)環境的管(guan)(guan)道(dao)稱(cheng)為低溫(wen)管(guan)(guan)道(dao)。

某管子(zi)分類不清(qing)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。