不(bu)銹鋼管(guan)(guan)(guan)(guan)件(jian)在管(guan)(guan)(guan)(guan)系中(zhong)起著改(gai)變走向、改(gai)變標高或改(gai)變直徑、封閉管(guan)(guan)(guan)(guan)端以及由主管(guan)(guan)(guan)(guan)上引出支管(guan)(guan)(guan)(guan)的作用。在石油化(hua)工裝置(zhi)中(zhong)管(guan)(guan)(guan)(guan)道品種多(duo)，管(guan)(guan)(guan)(guan)系復(fu)雜(za)、形狀(zhuang)各(ge)異(yi)、簡繁不(bu)等(deng)，所用的管(guan)(guan)(guan)(guan)件(jian)品種、材(cai)質(zhi)、數量也就(jiu)很多(duo)，選用時需(xu)要考(kao)慮的因素也很復(fu)雜(za)。

  非金屬管件和襯里管件的標準化程度不如不銹(xiu)鋼管件(jian)高，使用時要注意各制造廠在制造工藝、規格尺寸、各種性能等方面的差異。本節主要介紹鋼制管件(jian)，需要選用非金屬管件和襯里管件時可從有關的標準規范中查找。

  管(guan)件的用途見表(biao)4-25。

  根據管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)端部連接(jie)(jie)形式(shi)可將管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)分為(wei)對焊連接(jie)(jie)管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)（簡(jian)稱(cheng)對焊管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)）、承插焊連接(jie)(jie)管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)（簡(jian)稱(cheng)承插焊管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)）、螺(luo)紋連接(jie)(jie)管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)（簡(jian)稱(cheng)螺(luo)紋管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)）、法蘭連接(jie)(jie)管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)以及其他(ta)管(guan)(guan)件(jian)(jian)(jian)(jian)(jian)。

  壓(ya)力管(guan)(guan)(guan)道設(she)計中，常用(yong)(yong)(yong)對(dui)焊管(guan)(guan)(guan)件(jian)、支(zhi)管(guan)(guan)(guan)臺、承插焊及螺紋連接管(guan)(guan)(guan)件(jian)的形式。法蘭管(guan)(guan)(guan)件(jian)多用(yong)(yong)(yong)于特(te)殊場合，使(shi)用(yong)(yong)(yong)范圍及數量相對(dui)比較少(shao)。需要時可根據《鋼制(zhi)法蘭管(guan)(guan)(guan)件(jian)》（GB／T17185）的規定選用(yong)(yong)(yong)。