①. 由于各國不(bu)銹鋼管件標準化程度不同，分支管連接方式及管件的選擇也不盡相同。一般情況下，支管連接多采用成型支管連接件、焊接的引出口連接件以及支管直接焊接在主管上等連接形式。

  ②. 支管連接(jie)件的選(xuan)(xuan)擇(ze)主要(yao)依據管道等(deng)級中已經確定(ding)的法蘭(lan)壓(ya)力等(deng)級或公稱壓(ya)力來選(xuan)(xuan)用(yong)支管連接(jie)件。

    一般情(qing)況下，當法蘭的(de)公稱壓力(li)不大于PN2.5（Class 150）時(shi)，支(zhi)管(guan)(guan)(guan)直接焊接在主管(guan)(guan)(guan)上；當公稱壓力(li)不小于PN4.0（Class 300）時(shi)，則根據主管(guan)(guan)(guan)、支(zhi)管(guan)(guan)(guan)公稱直徑的(de)不同按對焊三通、焊接支(zhi)管(guan)(guan)(guan)臺、承插(cha)焊或(huo)螺紋連接三通、承插(cha)焊或(huo)螺紋支(zhi)管(guan)(guan)(guan)臺的(de)順序選用。

  ③. 支管連接件(jian)的(de)管子(zi)表號。

   值得(de)注意的(de)(de)(de)(de)(de)是在確定支管(guan)(guan)(guan)連接(jie)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)時，應根據管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)等強度的(de)(de)(de)(de)(de)原則以及管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)與(yu)(yu)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)連接(jie)方式而定。例(li)如，當管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)采(cai)用對焊(han)連接(jie)時，管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與(yu)(yu)不銹鋼管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)應一(yi)致(zhi)；而當管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)采(cai)用承(cheng)(cheng)(cheng)插(cha)(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)連接(jie)時，標準的(de)(de)(de)(de)(de)承(cheng)(cheng)(cheng)插(cha)(cha)(cha)焊(han)和螺(luo)紋(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)只有Sch80、Sch160、XXS三擋，最低的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)就(jiu)是Sch80，也就(jiu)是說只要當承(cheng)(cheng)(cheng)插(cha)(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)所連接(jie)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)不大于Sch80時，承(cheng)(cheng)(cheng)插(cha)(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)就(jiu)選(xuan)Sch80，而當所連接(jie)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)大于Sch80時，承(cheng)(cheng)(cheng)插(cha)(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)(biao)(biao)號(hao)就(jiu)選(xuan)Sch160或(huo)XXS。

   另外，當對焊三通主(zhu)管、支(zhi)(zhi)管所連接的管子的管子表號不同(tong)時，應(ying)注意(yi)三通主(zhu)管、支(zhi)(zhi)管端部的管子表號應(ying)分別(bie)與其所連接的管子的管子表號相同(tong)，這樣就非常方便管道施工(gong)，管件不必(bi)現場再打坡口。

   值得注意的(de)是(shi)(shi)選用支管(guan)(guan)直接焊接在主管(guan)(guan)上這一種連接形式，要核算管(guan)(guan)子(zi)是(shi)(shi)否需(xu)要補強。支管(guan)(guan)補強的(de)方法(fa)在ASME B31.3、SH／T 3059《石油化工(gong)(gong)管(guan)(guan)道(dao)設計器材選用規(gui)范(fan)(fan)》、GB50316《工(gong)(gong)業(ye)金屬管(guan)(guan)道(dao)設計規(gui)范(fan)(fan)》、GB／T 20801《壓力管(guan)(guan)道(dao)規(gui)范(fan)(fan)工(gong)(gong)業(ye)管(guan)(guan)道(dao)》等標準規(gui)范(fan)(fan)中均有詳細的(de)介紹。