按管(guan)道(dao)(dao)(dao)的(de)(de)公稱(cheng)(cheng)壓(ya)力劃分時，習慣上將真空管(guan)道(dao)(dao)(dao)與低壓(ya)管(guan)道(dao)(dao)(dao)合并。凡公稱(cheng)(cheng)壓(ya)力小(xiao)于(yu)2.5MPa的(de)(de)管(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)低壓(ya)管(guan)道(dao)(dao)(dao)；公稱(cheng)(cheng)壓(ya)力為(wei)4～6.4MPa的(de)(de)管(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)中壓(ya)管(guan)道(dao)(dao)(dao)；公稱(cheng)(cheng)壓(ya)力為(wei)10～100MPa的(de)(de)管(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)高(gao)壓(ya)管(guan)道(dao)(dao)(dao)；公稱(cheng)(cheng)壓(ya)力大于(yu)100MPa的(de)(de)管(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)超高(gao)壓(ya)管(guan)道(dao)(dao)(dao)。

  按(an)管(guan)(guan)(guan)道(dao)(dao)(dao)工(gong)(gong)作溫(wen)度(du)劃分時，習慣上將(jiang)(jiang)在(zai)(zai)-40～120℃溫(wen)度(du)范圍(wei)內工(gong)(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)(wei)常溫(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)在(zai)(zai)120～450℃溫(wen)度(du)范圍(wei)內工(gong)(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)(wei)中溫(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)在(zai)(zai)高(gao)于450℃溫(wen)度(du)下工(gong)(gong)作的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)(wei)高(gao)溫(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)工(gong)(gong)作于-40℃以(yi)下溫(wen)度(du)環境的(de)管(guan)(guan)(guan)道(dao)(dao)(dao)稱(cheng)為(wei)(wei)(wei)低溫(wen)管(guan)(guan)(guan)道(dao)(dao)(dao)。

某管(guan)子分(fen)類不清引起的(de)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。