①. 由于各國不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(guan)連(lian)接件的選擇主(zhu)要依據管(guan)道等(deng)級中已經確定的法(fa)蘭壓力等(deng)級或公稱壓力來選用支管(guan)連(lian)接件。

    一(yi)般情況下，當(dang)法(fa)蘭(lan)的(de)(de)公稱壓力不(bu)(bu)大(da)于PN2.5（Class 150）時(shi)，支(zhi)管(guan)(guan)直接焊接在主管(guan)(guan)上；當(dang)公稱壓力不(bu)(bu)小于PN4.0（Class 300）時(shi)，則根據主管(guan)(guan)、支(zhi)管(guan)(guan)公稱直徑的(de)(de)不(bu)(bu)同(tong)按對(dui)焊三通(tong)(tong)、焊接支(zhi)管(guan)(guan)臺、承(cheng)插焊或螺(luo)紋(wen)連接三通(tong)(tong)、承(cheng)插焊或螺(luo)紋(wen)支(zhi)管(guan)(guan)臺的(de)(de)順序(xu)選用。

  ③. 支管(guan)連接(jie)件的管(guan)子表號。

   值得注意(yi)的(de)(de)(de)是在確定支管(guan)(guan)(guan)(guan)連(lian)(lian)接(jie)件(jian)(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號時，應根(gen)據管(guan)(guan)(guan)(guan)子(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)等強度的(de)(de)(de)原則以(yi)及管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)與(yu)(yu)管(guan)(guan)(guan)(guan)子(zi)(zi)連(lian)(lian)接(jie)方(fang)式而定。例如，當(dang)管(guan)(guan)(guan)(guan)子(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)采(cai)用(yong)對焊(han)連(lian)(lian)接(jie)時，管(guan)(guan)(guan)(guan)子(zi)(zi)與(yu)(yu)不銹鋼管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號應一致；而當(dang)管(guan)(guan)(guan)(guan)子(zi)(zi)與(yu)(yu)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)采(cai)用(yong)承(cheng)(cheng)插(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)連(lian)(lian)接(jie)時，標準(zhun)的(de)(de)(de)承(cheng)(cheng)插(cha)(cha)焊(han)和(he)螺(luo)紋(wen)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號只有Sch80、Sch160、XXS三擋(dang)，最低的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號就是Sch80，也就是說只要當(dang)承(cheng)(cheng)插(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)所(suo)連(lian)(lian)接(jie)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號不大于(yu)Sch80時，承(cheng)(cheng)插(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號就選Sch80，而當(dang)所(suo)連(lian)(lian)接(jie)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號大于(yu)Sch80時，承(cheng)(cheng)插(cha)(cha)焊(han)或(huo)螺(luo)紋(wen)管(guan)(guan)(guan)(guan)件(jian)(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)(biao)號就選Sch160或(huo)XXS。

   另外，當對焊三通(tong)主(zhu)管(guan)(guan)、支(zhi)管(guan)(guan)所連(lian)接的(de)管(guan)(guan)子的(de)管(guan)(guan)子表號(hao)不(bu)同(tong)時，應注意(yi)三通(tong)主(zhu)管(guan)(guan)、支(zhi)管(guan)(guan)端部的(de)管(guan)(guan)子表號(hao)應分(fen)別與(yu)其(qi)所連(lian)接的(de)管(guan)(guan)子的(de)管(guan)(guan)子表號(hao)相同(tong)，這樣就非常方便管(guan)(guan)道施工，管(guan)(guan)件不(bu)必現場再(zai)打(da)坡(po)口。

   值(zhi)得注意的是選用支(zhi)管(guan)(guan)直接(jie)焊接(jie)在(zai)主(zhu)管(guan)(guan)上這一種連接(jie)形式，要核算管(guan)(guan)子是否需要補強。支(zhi)管(guan)(guan)補強的方(fang)法在(zai)ASME B31.3、SH／T 3059《石(shi)油化(hua)工管(guan)(guan)道(dao)(dao)設計(ji)器材選用規(gui)(gui)范(fan)》、GB50316《工業金屬管(guan)(guan)道(dao)(dao)設計(ji)規(gui)(gui)范(fan)》、GB／T 20801《壓力管(guan)(guan)道(dao)(dao)規(gui)(gui)范(fan)工業管(guan)(guan)道(dao)(dao)》等標準規(gui)(gui)范(fan)中均有詳(xiang)細的介(jie)紹。