不(bu)銹(xiu)鋼(gang)管(guan)(guan)件在(zai)管(guan)(guan)系中起著改變走向(xiang)、改變標(biao)高或(huo)改變直徑、封閉管(guan)(guan)端以及由主管(guan)(guan)上引出支管(guan)(guan)的作(zuo)用(yong)。在(zai)石油化工裝(zhuang)置中管(guan)(guan)道(dao)品種(zhong)(zhong)多，管(guan)(guan)系復(fu)雜、形狀各異、簡繁不(bu)等，所用(yong)的管(guan)(guan)件品種(zhong)(zhong)、材質、數量也就(jiu)很多，選用(yong)時需要考慮的因素(su)也很復(fu)雜。

  非金屬管件和襯里管件的標準化程度不如不銹鋼管件高，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(zhi)管件，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(de)用途見表(biao)4-25。

  根據管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)端部連(lian)接(jie)(jie)形式(shi)可將管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)分為對(dui)焊(han)連(lian)接(jie)(jie)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)（簡稱對(dui)焊(han)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)）、承插(cha)焊(han)連(lian)接(jie)(jie)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)（簡稱承插(cha)焊(han)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)）、螺(luo)紋連(lian)接(jie)(jie)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)（簡稱螺(luo)紋管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)）、法蘭連(lian)接(jie)(jie)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)以(yi)及其他管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)(jian)(jian)。

  壓力管(guan)道設計中，常用(yong)對焊(han)(han)管(guan)件、支管(guan)臺、承插焊(han)(han)及螺紋連接管(guan)件的(de)形式。法(fa)蘭管(guan)件多(duo)用(yong)于特殊場合，使用(yong)范(fan)圍及數量(liang)相對比較(jiao)少。需要時可(ke)根據(ju)《鋼(gang)制法(fa)蘭管(guan)件》（GB／T17185）的(de)規定選用(yong)。