按管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)公(gong)(gong)稱(cheng)壓(ya)力(li)(li)劃分時(shi)，習(xi)慣上(shang)將真空管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道與低壓(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道合并(bing)。凡公(gong)(gong)稱(cheng)壓(ya)力(li)(li)小于2.5MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道稱(cheng)為低壓(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道；公(gong)(gong)稱(cheng)壓(ya)力(li)(li)為4～6.4MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道稱(cheng)為中壓(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道；公(gong)(gong)稱(cheng)壓(ya)力(li)(li)為10～100MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道稱(cheng)為高壓(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道；公(gong)(gong)稱(cheng)壓(ya)力(li)(li)大于100MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道稱(cheng)為超高壓(ya)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道。

  按管(guan)道(dao)(dao)工作溫(wen)(wen)度劃分時，習慣上將(jiang)(jiang)在-40～120℃溫(wen)(wen)度范圍(wei)(wei)內(nei)工作的管(guan)道(dao)(dao)稱(cheng)(cheng)為常(chang)溫(wen)(wen)管(guan)道(dao)(dao)；將(jiang)(jiang)在120～450℃溫(wen)(wen)度范圍(wei)(wei)內(nei)工作的管(guan)道(dao)(dao)稱(cheng)(cheng)為中溫(wen)(wen)管(guan)道(dao)(dao)；將(jiang)(jiang)在高于450℃溫(wen)(wen)度下(xia)工作的管(guan)道(dao)(dao)稱(cheng)(cheng)為高溫(wen)(wen)管(guan)道(dao)(dao)；將(jiang)(jiang)工作于-40℃以下(xia)溫(wen)(wen)度環境(jing)的管(guan)道(dao)(dao)稱(cheng)(cheng)為低溫(wen)(wen)管(guan)道(dao)(dao)。

某管子分類不清引起的事(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。