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(zhi)管連(lian)(lian)接件(jian)的選(xuan)擇主要依(yi)據管道等級(ji)中已經確定(ding)的法蘭壓(ya)力(li)等級(ji)或公(gong)稱壓(ya)力(li)來選(xuan)用支(zhi)管連(lian)(lian)接件(jian)。

    一般(ban)情況下(xia)，當法(fa)蘭的公(gong)(gong)稱(cheng)壓(ya)力不大(da)于PN2.5（Class 150）時，支(zhi)管(guan)直接(jie)焊(han)接(jie)在主(zhu)管(guan)上；當公(gong)(gong)稱(cheng)壓(ya)力不小于PN4.0（Class 300）時，則根據主(zhu)管(guan)、支(zhi)管(guan)公(gong)(gong)稱(cheng)直徑的不同按對(dui)焊(han)三(san)通、焊(han)接(jie)支(zhi)管(guan)臺、承(cheng)(cheng)插焊(han)或螺(luo)(luo)紋連接(jie)三(san)通、承(cheng)(cheng)插焊(han)或螺(luo)(luo)紋支(zhi)管(guan)臺的順序選用。

  ③. 支管(guan)連(lian)接件的(de)管(guan)子(zi)表號。

   值得注意的(de)(de)(de)是在(zai)確定支管(guan)(guan)(guan)連(lian)(lian)(lian)接件(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)時(shi)，應根據(ju)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與管(guan)(guan)(guan)件(jian)(jian)(jian)等(deng)強度的(de)(de)(de)原則以(yi)及(ji)管(guan)(guan)(guan)件(jian)(jian)(jian)與管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)連(lian)(lian)(lian)接方(fang)式(shi)而(er)定。例(li)如，當管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與管(guan)(guan)(guan)件(jian)(jian)(jian)采用對焊(han)(han)連(lian)(lian)(lian)接時(shi)，管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與不銹鋼管(guan)(guan)(guan)件(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)應一(yi)致；而(er)當管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)與管(guan)(guan)(guan)件(jian)(jian)(jian)采用承(cheng)(cheng)插(cha)焊(han)(han)或(huo)(huo)(huo)螺(luo)(luo)(luo)紋(wen)(wen)連(lian)(lian)(lian)接時(shi)，標準的(de)(de)(de)承(cheng)(cheng)插(cha)焊(han)(han)和(he)螺(luo)(luo)(luo)紋(wen)(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)只(zhi)有Sch80、Sch160、XXS三擋，最(zui)低的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)就(jiu)是Sch80，也就(jiu)是說只(zhi)要當承(cheng)(cheng)插(cha)焊(han)(han)或(huo)(huo)(huo)螺(luo)(luo)(luo)紋(wen)(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)所(suo)連(lian)(lian)(lian)接的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)不大于Sch80時(shi)，承(cheng)(cheng)插(cha)焊(han)(han)或(huo)(huo)(huo)螺(luo)(luo)(luo)紋(wen)(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)就(jiu)選(xuan)Sch80，而(er)當所(suo)連(lian)(lian)(lian)接的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)大于Sch80時(shi)，承(cheng)(cheng)插(cha)焊(han)(han)或(huo)(huo)(huo)螺(luo)(luo)(luo)紋(wen)(wen)管(guan)(guan)(guan)件(jian)(jian)(jian)的(de)(de)(de)管(guan)(guan)(guan)子(zi)(zi)(zi)(zi)表(biao)(biao)號(hao)(hao)就(jiu)選(xuan)Sch160或(huo)(huo)(huo)XXS。

   另外，當對(dui)焊三通(tong)主管(guan)(guan)(guan)(guan)(guan)、支(zhi)管(guan)(guan)(guan)(guan)(guan)所連接的(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)(zi)的(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)號(hao)不同時，應注意三通(tong)主管(guan)(guan)(guan)(guan)(guan)、支(zhi)管(guan)(guan)(guan)(guan)(guan)端部(bu)的(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)號(hao)應分(fen)別(bie)與其所連接的(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)(zi)的(de)(de)管(guan)(guan)(guan)(guan)(guan)子(zi)(zi)表(biao)號(hao)相同，這樣(yang)就非常(chang)方便管(guan)(guan)(guan)(guan)(guan)道施工(gong)，管(guan)(guan)(guan)(guan)(guan)件不必現場(chang)再(zai)打坡口。

   值得注意的(de)是選用支管(guan)(guan)直(zhi)接焊接在主管(guan)(guan)上(shang)這一種(zhong)連(lian)接形(xing)式，要核(he)算管(guan)(guan)子(zi)是否需要補強。支管(guan)(guan)補強的(de)方法在ASME B31.3、SH／T 3059《石油(you)化工管(guan)(guan)道(dao)設計(ji)器材選用規(gui)范》、GB50316《工業金屬管(guan)(guan)道(dao)設計(ji)規(gui)范》、GB／T 20801《壓力管(guan)(guan)道(dao)規(gui)范工業管(guan)(guan)道(dao)》等(deng)標準規(gui)范中(zhong)均(jun)有詳細的(de)介紹。