①. 管子按用途分類見表16.35。

   ②. 按材質分類見表(biao)16.36。

   ③. 按制管工藝分類見表16.37。

   ④. 按公(gong)稱壓力(li)和設計溫(wen)度分類

   按(an)管(guan)(guan)(guan)道的公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)劃分(fen)時(shi)，習慣上將真空管(guan)(guan)(guan)道與低(di)壓(ya)(ya)(ya)管(guan)(guan)(guan)道合(he)并(bing)。凡公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)小于(yu)2.5MPa的管(guan)(guan)(guan)道稱(cheng)(cheng)為(wei)低(di)壓(ya)(ya)(ya)管(guan)(guan)(guan)道；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)為(wei)4～6.4MPa。的管(guan)(guan)(guan)道稱(cheng)(cheng)為(wei)中壓(ya)(ya)(ya)管(guan)(guan)(guan)道；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)為(wei)10～100MPa的管(guan)(guan)(guan)道稱(cheng)(cheng)為(wei)高壓(ya)(ya)(ya)管(guan)(guan)(guan)道；公稱(cheng)(cheng)壓(ya)(ya)(ya)力(li)(li)大于(yu)100MPa。的管(guan)(guan)(guan)道稱(cheng)(cheng)為(wei)超高壓(ya)(ya)(ya)管(guan)(guan)(guan)道。

   按管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)工(gong)作溫(wen)(wen)(wen)(wen)度(du)劃分時，習慣上將-40～120℃溫(wen)(wen)(wen)(wen)度(du)范圍內工(gong)作的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱為(wei)常溫(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將在120～450℃溫(wen)(wen)(wen)(wen)度(du)范圍內工(gong)作的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱為(wei)中溫(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將在高(gao)于450℃溫(wen)(wen)(wen)(wen)度(du)下工(gong)作的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱為(wei)高(gao)溫(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)；將工(gong)作于-40℃以(yi)下溫(wen)(wen)(wen)(wen)度(du)環境的(de)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)稱為(wei)低溫(wen)(wen)(wen)(wen)管(guan)(guan)(guan)(guan)道(dao)(dao)(dao)(dao)。

工(gong)程應用：某管子分(fen)類不(bu)清引起的事故

   某DN2000的(de)(de)火(huo)炬氣管(guan)子(zi)，為GB9711.2標準(zhun)的(de)(de)L245有縫管(guan)子(zi)。設計(ji)的(de)(de)是GB9711.2標準(zhun)的(de)(de)直(zhi)縫鋼管(guan)。但是，在訂貨(huo)材料(liao)單的(de)(de)描述內沒有寫(xie)清(qing)楚是GB 9711.2標準(zhun)的(de)(de)直(zhi)縫鋼管(guan)還是GB9711.2標準(zhun)的(de)(de)螺(luo)縫鋼管(guan)，結果到(dao)施工現場的(de)(de)是GB9711.2標準(zhun)的(de)(de)螺(luo)縫鋼管(guan)，出現了因管(guan)子(zi)分類(lei)不清(qing)引起的(de)(de)采(cai)購事(shi)故。

工程應用(yong)：Pipe管(guan)與Tube管(guan)的(de)應用(yong)

   Pipe管(guan)(guan)作為(wei)(wei)輸(shu)送用(yong)(yong)的管(guan)(guan)道，用(yong)(yong)公稱直(zhi)徑命名；Tube 管(guan)(guan)作為(wei)(wei)傳熱用(yong)(yong)的管(guan)(guan)，用(yong)(yong)“外徑x壁厚”表示(shi)，Tubing 管(guan)(guan)作為(wei)(wei)（儀表、伴(ban)熱、油路）管(guan)(guan)路，用(yong)(yong)“外徑X壁厚”表示(shi)。

   鋼(gang)管(guan)(guan)標準(zhun)(zhun)可以分(fen)為Pipe管(guan)(guan)標準(zhun)(zhun)、Tube管(guan)(guan)標準(zhun)(zhun)和機(ji)械結構鋼(gang)管(guan)(guan)標準(zhun)(zhun)。Pipe管(guan)(guan)與(yu)Tube管(guan)(guan)的比較(jiao)見表 16.38 。