按(an)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)的(de)(de)公稱(cheng)壓力劃分時，習(xi)慣(guan)上將(jiang)真空管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)與低壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)合并。凡公稱(cheng)壓力小于(yu)(yu)2.5MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)(wei)低壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；公稱(cheng)壓力為(wei)(wei)4～6.4MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)(wei)中壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；公稱(cheng)壓力為(wei)(wei)10～100MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)(wei)高壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；公稱(cheng)壓力大于(yu)(yu)100MPa的(de)(de)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱(cheng)為(wei)(wei)超(chao)高壓管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)。

  按(an)管(guan)(guan)道(dao)工(gong)作(zuo)(zuo)溫(wen)度(du)(du)(du)劃分(fen)時(shi)，習慣上將(jiang)在(zai)-40～120℃溫(wen)度(du)(du)(du)范圍內(nei)工(gong)作(zuo)(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)常(chang)溫(wen)管(guan)(guan)道(dao)；將(jiang)在(zai)120～450℃溫(wen)度(du)(du)(du)范圍內(nei)工(gong)作(zuo)(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)中(zhong)溫(wen)管(guan)(guan)道(dao)；將(jiang)在(zai)高于450℃溫(wen)度(du)(du)(du)下工(gong)作(zuo)(zuo)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)高溫(wen)管(guan)(guan)道(dao)；將(jiang)工(gong)作(zuo)(zuo)于-40℃以下溫(wen)度(du)(du)(du)環境(jing)的(de)管(guan)(guan)道(dao)稱(cheng)為(wei)低溫(wen)管(guan)(guan)道(dao)。

某(mou)管子分類不清(qing)引起(qi)的事故(gu)

  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。