按管(guan)(guan)(guan)道(dao)的(de)(de)公(gong)稱(cheng)(cheng)壓(ya)力劃分時，習(xi)慣(guan)上將真空(kong)管(guan)(guan)(guan)道(dao)與(yu)低(di)壓(ya)管(guan)(guan)(guan)道(dao)合并(bing)。凡公(gong)稱(cheng)(cheng)壓(ya)力小于2.5MPa的(de)(de)管(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)低(di)壓(ya)管(guan)(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)力為(wei)(wei)(wei)4～6.4MPa的(de)(de)管(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)中壓(ya)管(guan)(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)力為(wei)(wei)(wei)10～100MPa的(de)(de)管(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)高壓(ya)管(guan)(guan)(guan)道(dao)；公(gong)稱(cheng)(cheng)壓(ya)力大(da)于100MPa的(de)(de)管(guan)(guan)(guan)道(dao)稱(cheng)(cheng)為(wei)(wei)(wei)超高壓(ya)管(guan)(guan)(guan)道(dao)。

  按管(guan)道(dao)(dao)工作溫(wen)(wen)(wen)度(du)劃分時，習慣上將在(zai)-40～120℃溫(wen)(wen)(wen)度(du)范圍內工作的管(guan)道(dao)(dao)稱為(wei)常(chang)溫(wen)(wen)(wen)管(guan)道(dao)(dao)；將在(zai)120～450℃溫(wen)(wen)(wen)度(du)范圍內工作的管(guan)道(dao)(dao)稱為(wei)中溫(wen)(wen)(wen)管(guan)道(dao)(dao)；將在(zai)高于450℃溫(wen)(wen)(wen)度(du)下(xia)工作的管(guan)道(dao)(dao)稱為(wei)高溫(wen)(wen)(wen)管(guan)道(dao)(dao)；將工作于-40℃以下(xia)溫(wen)(wen)(wen)度(du)環(huan)境的管(guan)道(dao)(dao)稱為(wei)低溫(wen)(wen)(wen)管(guan)道(dao)(dao)。

某管子分類(lei)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。