按管(guan)(guan)道(dao)的公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)力(li)劃分時，習慣上將真空管(guan)(guan)道(dao)與(yu)低壓(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)合(he)并。凡公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)力(li)小(xiao)于2.5MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為低壓(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)力(li)為4～6.4MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為中壓(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)力(li)為10～100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為高壓(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)；公稱(cheng)(cheng)(cheng)壓(ya)(ya)(ya)(ya)力(li)大于100MPa的管(guan)(guan)道(dao)稱(cheng)(cheng)(cheng)為超高壓(ya)(ya)(ya)(ya)管(guan)(guan)道(dao)。

  按管(guan)(guan)(guan)道(dao)(dao)工作溫(wen)(wen)(wen)度(du)(du)劃分時，習慣上將(jiang)(jiang)在-40～120℃溫(wen)(wen)(wen)度(du)(du)范圍(wei)內(nei)工作的(de)管(guan)(guan)(guan)道(dao)(dao)稱為常溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)；將(jiang)(jiang)在120～450℃溫(wen)(wen)(wen)度(du)(du)范圍(wei)內(nei)工作的(de)管(guan)(guan)(guan)道(dao)(dao)稱為中溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)；將(jiang)(jiang)在高于450℃溫(wen)(wen)(wen)度(du)(du)下(xia)(xia)工作的(de)管(guan)(guan)(guan)道(dao)(dao)稱為高溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)；將(jiang)(jiang)工作于-40℃以下(xia)(xia)溫(wen)(wen)(wen)度(du)(du)環境(jing)的(de)管(guan)(guan)(guan)道(dao)(dao)稱為低溫(wen)(wen)(wen)管(guan)(guan)(guan)道(dao)(dao)。

某管子分(fen)類不清(qing)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。