按管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)公(gong)稱(cheng)壓(ya)力劃分(fen)時，習慣(guan)上將真空管(guan)(guan)(guan)(guan)道(dao)(dao)與低(di)壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)合并。凡公(gong)稱(cheng)壓(ya)力小(xiao)于(yu)2.5MPa的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)低(di)壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)；公(gong)稱(cheng)壓(ya)力為(wei)4～6.4MPa的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)中壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)；公(gong)稱(cheng)壓(ya)力為(wei)10～100MPa的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)高(gao)壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)；公(gong)稱(cheng)壓(ya)力大(da)于(yu)100MPa的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)超高(gao)壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)。

  按管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)工(gong)(gong)作溫(wen)度(du)(du)劃分時，習慣上將在-40～120℃溫(wen)度(du)(du)范圍內工(gong)(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)稱為常(chang)溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)；將在120～450℃溫(wen)度(du)(du)范圍內工(gong)(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)稱為中溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)；將在高于(yu)450℃溫(wen)度(du)(du)下(xia)(xia)工(gong)(gong)作的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)稱為高溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)；將工(gong)(gong)作于(yu)-40℃以下(xia)(xia)溫(wen)度(du)(du)環境的(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)稱為低溫(wen)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)。

某管子分(fen)類不(bu)清引起的事故(gu)

  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。