①. 管子按(an)用途(tu)分類見表16.35。

   ②. 按材質分類見表16.36。

   ③. 按制管(guan)工藝分(fen)類(lei)見(jian)表(biao)16.37。

   ④. 按公(gong)稱(cheng)壓力和設計溫度分(fen)類

   按(an)管(guan)(guan)(guan)道(dao)(dao)的公(gong)(gong)(gong)稱(cheng)壓(ya)(ya)力(li)劃分時，習慣上將(jiang)真空管(guan)(guan)(guan)道(dao)(dao)與低(di)壓(ya)(ya)管(guan)(guan)(guan)道(dao)(dao)合并。凡(fan)公(gong)(gong)(gong)稱(cheng)壓(ya)(ya)力(li)小于(yu)2.5MPa的管(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)低(di)壓(ya)(ya)管(guan)(guan)(guan)道(dao)(dao)；公(gong)(gong)(gong)稱(cheng)壓(ya)(ya)力(li)為(wei)4～6.4MPa。的管(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)中壓(ya)(ya)管(guan)(guan)(guan)道(dao)(dao)；公(gong)(gong)(gong)稱(cheng)壓(ya)(ya)力(li)為(wei)10～100MPa的管(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)高壓(ya)(ya)管(guan)(guan)(guan)道(dao)(dao)；公(gong)(gong)(gong)稱(cheng)壓(ya)(ya)力(li)大于(yu)100MPa。的管(guan)(guan)(guan)道(dao)(dao)稱(cheng)為(wei)超高壓(ya)(ya)管(guan)(guan)(guan)道(dao)(dao)。

   按管(guan)道(dao)工(gong)(gong)作(zuo)(zuo)溫(wen)(wen)度(du)(du)劃分時，習慣上將-40～120℃溫(wen)(wen)度(du)(du)范圍(wei)內(nei)(nei)工(gong)(gong)作(zuo)(zuo)的(de)管(guan)道(dao)稱(cheng)(cheng)為常溫(wen)(wen)管(guan)道(dao)；將在120～450℃溫(wen)(wen)度(du)(du)范圍(wei)內(nei)(nei)工(gong)(gong)作(zuo)(zuo)的(de)管(guan)道(dao)稱(cheng)(cheng)為中溫(wen)(wen)管(guan)道(dao)；將在高于450℃溫(wen)(wen)度(du)(du)下工(gong)(gong)作(zuo)(zuo)的(de)管(guan)道(dao)稱(cheng)(cheng)為高溫(wen)(wen)管(guan)道(dao)；將工(gong)(gong)作(zuo)(zuo)于-40℃以(yi)下溫(wen)(wen)度(du)(du)環境(jing)的(de)管(guan)道(dao)稱(cheng)(cheng)為低溫(wen)(wen)管(guan)道(dao)。

工程應用：某管子分類不清(qing)引起的(de)事故

   某DN2000的(de)(de)火炬(ju)氣管(guan)(guan)子，為(wei)GB9711.2標準(zhun)的(de)(de)L245有(you)縫管(guan)(guan)子。設(she)計的(de)(de)是GB9711.2標準(zhun)的(de)(de)直縫鋼(gang)(gang)(gang)管(guan)(guan)。但(dan)是，在訂(ding)貨(huo)材料(liao)單(dan)的(de)(de)描述內沒(mei)有(you)寫清楚是GB 9711.2標準(zhun)的(de)(de)直縫鋼(gang)(gang)(gang)管(guan)(guan)還是GB9711.2標準(zhun)的(de)(de)螺(luo)縫鋼(gang)(gang)(gang)管(guan)(guan)，結(jie)果到施工現場的(de)(de)是GB9711.2標準(zhun)的(de)(de)螺(luo)縫鋼(gang)(gang)(gang)管(guan)(guan)，出現了因管(guan)(guan)子分類不清引起的(de)(de)采購事(shi)故。

工(gong)程(cheng)應(ying)用(yong)：Pipe管與Tube管的(de)應(ying)用(yong)

   Pipe管(guan)作為輸送用的(de)管(guan)道，用公稱直徑命名(ming)；Tube 管(guan)作為傳熱用的(de)管(guan)，用“外(wai)徑x壁厚”表(biao)示(shi)，Tubing 管(guan)作為（儀(yi)表(biao)、伴(ban)熱、油(you)路）管(guan)路，用“外(wai)徑X壁厚”表(biao)示(shi)。

   鋼管(guan)(guan)標(biao)準可以分為Pipe管(guan)(guan)標(biao)準、Tube管(guan)(guan)標(biao)準和機械結構(gou)鋼管(guan)(guan)標(biao)準。Pipe管(guan)(guan)與Tube管(guan)(guan)的比較見表 16.38 。