按(an)管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)公(gong)(gong)稱(cheng)壓(ya)力(li)(li)劃分時，習慣上將真空管(guan)(guan)(guan)(guan)道(dao)(dao)與(yu)低壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)合并。凡公(gong)(gong)稱(cheng)壓(ya)力(li)(li)小于(yu)2.5MPa的(de)(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)低壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)；公(gong)(gong)稱(cheng)壓(ya)力(li)(li)為(wei)4～6.4MPa的(de)(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)(gong)稱(cheng)壓(ya)力(li)(li)為(wei)10～100MPa的(de)(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)高壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)；公(gong)(gong)稱(cheng)壓(ya)力(li)(li)大于(yu)100MPa的(de)(de)管(guan)(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)超高壓(ya)管(guan)(guan)(guan)(guan)道(dao)(dao)。

  按管(guan)(guan)道(dao)工作(zuo)溫(wen)(wen)(wen)度劃分(fen)時(shi)，習慣上將(jiang)(jiang)在(zai)-40～120℃溫(wen)(wen)(wen)度范(fan)(fan)圍內(nei)工作(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)(wei)(wei)常溫(wen)(wen)(wen)管(guan)(guan)道(dao)；將(jiang)(jiang)在(zai)120～450℃溫(wen)(wen)(wen)度范(fan)(fan)圍內(nei)工作(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)(wei)(wei)中溫(wen)(wen)(wen)管(guan)(guan)道(dao)；將(jiang)(jiang)在(zai)高于450℃溫(wen)(wen)(wen)度下工作(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)(wei)(wei)高溫(wen)(wen)(wen)管(guan)(guan)道(dao)；將(jiang)(jiang)工作(zuo)于-40℃以下溫(wen)(wen)(wen)度環境的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)(wei)(wei)低溫(wen)(wen)(wen)管(guan)(guan)道(dao)。

某(mou)管(guan)子分類不清引起的事故

  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。