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

  按管(guan)(guan)道(dao)(dao)(dao)工作(zuo)(zuo)溫(wen)(wen)度(du)劃分時，習慣上(shang)將(jiang)(jiang)(jiang)在-40～120℃溫(wen)(wen)度(du)范圍(wei)內(nei)(nei)工作(zuo)(zuo)的(de)管(guan)(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)(wei)(wei)常溫(wen)(wen)管(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)(jiang)在120～450℃溫(wen)(wen)度(du)范圍(wei)內(nei)(nei)工作(zuo)(zuo)的(de)管(guan)(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)(wei)(wei)中溫(wen)(wen)管(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)(jiang)在高于(yu)450℃溫(wen)(wen)度(du)下工作(zuo)(zuo)的(de)管(guan)(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)(wei)(wei)高溫(wen)(wen)管(guan)(guan)道(dao)(dao)(dao)；將(jiang)(jiang)(jiang)工作(zuo)(zuo)于(yu)-40℃以(yi)下溫(wen)(wen)度(du)環境的(de)管(guan)(guan)道(dao)(dao)(dao)稱(cheng)(cheng)為(wei)(wei)(wei)低溫(wen)(wen)管(guan)(guan)道(dao)(dao)(dao)。

某管(guan)子(zi)分(fen)類不(bu)清引起的(de)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。