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。




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