①. 不銹鋼管件的選擇是指根據管道級（類）別、設計條件（如設計溫度、設計壓力）、介質特性、材料加工工藝性能、焊接性能、經濟性以及用途來合理確定管件的溫度-壓力等級、不銹鋼管件的連接形式。

  ②. 不(bu)銹鋼管(guan)件的(de)選(xuan)擇應符合相(xiang)應的(de)標(biao)準規(gui)(gui)范(fan)，如《石油化(hua)工管(guan)道設計器材選(xuan)用(yong)規(gui)(gui)范(fan)》（SH/T3059）、《工業金屬管(guan)道設計規(gui)(gui)范(fan)》（GB50316）等(deng)。

  ③. 不銹鋼管件的連(lian)(lian)接(jie)形式多種多樣，相應的結構也有所不同，常用的有對焊連(lian)(lian)接(jie)、螺紋連(lian)(lian)接(jie)、承插焊連(lian)(lian)接(jie)和法蘭連(lian)(lian)接(jie)四種連(lian)(lian)接(jie)形式。

  按照國際通用作法，DN50及(ji)以上的管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)圖4-9 承(cheng)插焊與(yu)螺紋連(lian)(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)(guan)(guan)件(jian)多采用對焊連(lian)(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)(guan)(guan)件(jian)，DN40及(ji)以下多采用煨(wei)彎(wan)、承(cheng)插焊或錐(zhui)管(guan)(guan)(guan)(guan)(guan)(guan)螺紋連(lian)(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)(guan)(guan)件(jian)。選(xuan)用對焊連(lian)(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)(guan)(guan)件(jian)時，應根據等強度的原則(ze)使不(bu)銹鋼管(guan)(guan)(guan)(guan)(guan)(guan)件(jian)的管(guan)(guan)(guan)(guan)(guan)(guan)子表號與(yu)所連(lian)(lian)(lian)接(jie)的管(guan)(guan)(guan)(guan)(guan)(guan)子的管(guan)(guan)(guan)(guan)(guan)(guan)子表號一(yi)致。