按管(guan)(guan)道(dao)的(de)公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)(ya)力劃分時(shi)，習慣(guan)上將真空管(guan)(guan)道(dao)與低壓(ya)(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)合并。凡(fan)公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)(ya)力小于2.5MPa的(de)管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為低壓(ya)(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)(ya)力為4～6.4MPa的(de)管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為中(zhong)壓(ya)(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)(ya)力為10～100MPa的(de)管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為高壓(ya)(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)(ya)力大于100MPa的(de)管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為超高壓(ya)(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)。

  按管(guan)道(dao)(dao)(dao)工(gong)(gong)作(zuo)溫(wen)(wen)度劃分時，習慣上(shang)將在(zai)(zai)(zai)-40～120℃溫(wen)(wen)度范(fan)圍(wei)內工(gong)(gong)作(zuo)的管(guan)道(dao)(dao)(dao)稱(cheng)為(wei)常溫(wen)(wen)管(guan)道(dao)(dao)(dao)；將在(zai)(zai)(zai)120～450℃溫(wen)(wen)度范(fan)圍(wei)內工(gong)(gong)作(zuo)的管(guan)道(dao)(dao)(dao)稱(cheng)為(wei)中溫(wen)(wen)管(guan)道(dao)(dao)(dao)；將在(zai)(zai)(zai)高于(yu)450℃溫(wen)(wen)度下(xia)工(gong)(gong)作(zuo)的管(guan)道(dao)(dao)(dao)稱(cheng)為(wei)高溫(wen)(wen)管(guan)道(dao)(dao)(dao)；將工(gong)(gong)作(zuo)于(yu)-40℃以下(xia)溫(wen)(wen)度環(huan)境的管(guan)道(dao)(dao)(dao)稱(cheng)為(wei)低溫(wen)(wen)管(guan)道(dao)(dao)(dao)。

某管(guan)子(zi)分類(lei)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。