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(guan)件的連接形式。

  ②. 不(bu)銹(xiu)鋼(gang)管(guan)件(jian)的選擇應符合相(xiang)應的標準規范，如(ru)《石油化工(gong)管(guan)道(dao)設計器材選用規范》（SH/T3059）、《工(gong)業(ye)金屬管(guan)道(dao)設計規范》（GB50316）等。

  ③. 不(bu)銹鋼管件的(de)連(lian)(lian)接(jie)(jie)(jie)形式(shi)多種多樣(yang)，相應的(de)結構也有所(suo)不(bu)同，常用的(de)有對焊連(lian)(lian)接(jie)(jie)(jie)、螺紋(wen)連(lian)(lian)接(jie)(jie)(jie)、承插焊連(lian)(lian)接(jie)(jie)(jie)和法(fa)蘭(lan)連(lian)(lian)接(jie)(jie)(jie)四(si)種連(lian)(lian)接(jie)(jie)(jie)形式(shi)。

  按照國(guo)際(ji)通用(yong)(yong)作(zuo)法，DN50及(ji)以上(shang)的(de)管(guan)(guan)(guan)(guan)道圖4-9 承(cheng)插焊(han)(han)與(yu)螺紋連(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)件(jian)(jian)多(duo)采用(yong)(yong)對(dui)焊(han)(han)連(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)件(jian)(jian)，DN40及(ji)以下多(duo)采用(yong)(yong)煨(wei)彎、承(cheng)插焊(han)(han)或錐管(guan)(guan)(guan)(guan)螺紋連(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)件(jian)(jian)。選(xuan)用(yong)(yong)對(dui)焊(han)(han)連(lian)(lian)接(jie)管(guan)(guan)(guan)(guan)件(jian)(jian)時，應根據(ju)等強度(du)的(de)原(yuan)則使(shi)不(bu)銹(xiu)鋼管(guan)(guan)(guan)(guan)件(jian)(jian)的(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表號與(yu)所(suo)連(lian)(lian)接(jie)的(de)管(guan)(guan)(guan)(guan)子(zi)(zi)的(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表號一致。