按管(guan)(guan)道(dao)的公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)劃分時，習(xi)慣上將真空管(guan)(guan)道(dao)與低壓(ya)(ya)(ya)管(guan)(guan)道(dao)合并。凡公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)小于(yu)2.5MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)低壓(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)為(wei)(wei)4～6.4MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)中壓(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)為(wei)(wei)10～100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)高(gao)壓(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)大(da)于(yu)100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)超高(gao)壓(ya)(ya)(ya)管(guan)(guan)道(dao)。

  按管(guan)(guan)(guan)(guan)(guan)道(dao)工(gong)作溫(wen)度(du)(du)劃分時，習(xi)慣上將(jiang)在-40～120℃溫(wen)度(du)(du)范圍內工(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)常(chang)溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)；將(jiang)在120～450℃溫(wen)度(du)(du)范圍內工(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)中溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)；將(jiang)在高(gao)于450℃溫(wen)度(du)(du)下工(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)高(gao)溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)；將(jiang)工(gong)作于-40℃以下溫(wen)度(du)(du)環境的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)低溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)。

某管子分類不清引起的事(shi)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。