支(zhi)(zhi)管(guan)(guan)(guan)(guan)臺(tai)又叫支(zhi)(zhi)管(guan)(guan)(guan)(guan)座(zuo)、鞍(an)座(zuo)、鞍(an)形(xing)管(guan)(guan)(guan)(guan)接(jie)(jie)頭、管(guan)(guan)(guan)(guan)臺(tai)、管(guan)(guan)(guan)(guan)座(zuo)或加(jia)強(qiang)接(jie)(jie)管(guan)(guan)(guan)(guan),有的也稱(cheng)為(wei)半(ban)管(guan)(guan)(guan)(guan)接(jie)(jie)頭,提(ti)供了(le)一個大(da)口徑(jing)管(guan)(guan)(guan)(guan)道向(xiang)小口徑(jing)管(guan)(guan)(guan)(guan)道的分支(zhi)(zhi),支(zhi)(zhi)管(guan)(guan)(guan)(guan)臺(tai)焊(han)接(jie)(jie)其上的管(guan)(guan)(guan)(guan)道稱(cheng)為(wei)主管(guan)(guan)(guan)(guan),焊(han)接(jie)(jie)于支(zhi)(zhi)管(guan)(guan)(guan)(guan)臺(tai)之上的管(guan)(guan)(guan)(guan)道稱(cheng)為(wei)支(zhi)(zhi)管(guan)(guan)(guan)(guan)。主管(guan)(guan)(guan)(guan)補強(qiang)措(cuo)施以避免裂(lie)紋、角焊(han)縫和邊的錐形(xing)增固(gu),從而(er)避免管(guan)(guan)(guan)(guan)件和主管(guan)(guan)(guan)(guan)焊(han)接(jie)(jie)時發生的壁(bi)厚陡變。強(qiang)型(xing)管(guan)(guan)(guan)(guan)件,代(dai)替使用(yong)異徑(jing)三通(tong)、補強(qiang)板(ban)(ban)、加(jia)強(qiang)管(guan)(guan)(guan)(guan)段(duan)等支(zhi)(zhi)管(guan)(guan)(guan)(guan)連接(jie)(jie)形(xing)式,具有安全(quan)可靠(kao)、降低造價(jia)[可代(dai)替插(cha)管(guan)(guan)(guan)(guan)(sstub-inn),其強(qiang)度較(jiao)插(cha)管(guan)(guan)(guan)(guan)強(qiang)很多(duo),不(bu)需(xu)加(jia)強(qiang)板(ban)(ban),且比有加(jia)強(qiang)板(ban)(ban)的插(cha)管(guan)(guan)(guan)(guan)便宜]、施工簡單(dan)、改(gai)善介(jie)質(zhi)流道、系列標準化、設計選用(yong)方便等突出優點(dian),尤其在(zai)高(gao)壓(ya)、高(gao)溫(wen)、大(da)口徑(jing)、厚壁(bi)管(guan)(guan)(guan)(guan)道中(zhong)使用(yong)日益廣泛,取代(dai)了(le)傳統的支(zhi)(zhi)管(guan)(guan)(guan)(guan)連接(jie)(jie)方法。
支(zhi)管(guan)(guan)(guan)(guan)(guan)臺(tai)本體采(cai)用(yong)優(you)質鍛(duan)件(jian),用(yong)材與(yu)管(guan)(guan)(guan)(guan)(guan)道材料相同,有碳鋼(gang)、合金鋼(gang)、不銹鋼(gang)等(deng)。支(zhi)管(guan)(guan)(guan)(guan)(guan)座(zuo)(zuo)與(yu)主管(guan)(guan)(guan)(guan)(guan)均采(cai)用(yong)焊(han)接,與(yu)支(zhi)管(guan)(guan)(guan)(guan)(guan)或其他管(guan)(guan)(guan)(guan)(guan)[如短管(guan)(guan)(guan)(guan)(guan)、絲堵(plug)等(deng)]、儀(yi)表、閥門(men)的連(lian)接有對焊(han)連(lian)接、承(cheng)插焊(han)連(lian)接、螺紋(wen)連(lian)接3種形式。支(zhi)管(guan)(guan)(guan)(guan)(guan)臺(tai)常用(yong)制(zhi)(zhi)造(zao)和(he)尺寸(cun)等(deng)執行標準有MSS SP-97《整體加強鍛(duan)制(zhi)(zhi)分支(zhi)引(yin)出端管(guan)(guan)(guan)(guan)(guan)件(jian)-承(cheng)插焊(han)式、螺紋(wen)式與(yu)對焊(han)式端頭》、GB/T19326《鋼(gang)制(zhi)(zhi)承(cheng)插焊(han)、螺紋(wen)和(he)對焊(han)支(zhi)管(guan)(guan)(guan)(guan)(guan)座(zuo)(zuo)》、HG/T 21632《鍛(duan)鋼(gang)承(cheng)插焊(han)螺紋(wen)和(he)對焊(han)接管(guan)(guan)(guan)(guan)(guan)臺(tai)》等(deng)標準。
法蘭連接(jie)(jie)管(guan)(guan)件多用于特殊(shu)配管(guan)(guan)場合,實際用量(liang)相(xiang)對(dui)比(bi)較少。其他常用的管(guan)(guan)件還有加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou),例如螺紋加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(threadolet)、承(cheng)插焊加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(sockolet)、對(dui)焊加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(weldolet)、插入加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(insert weldolet)、斜接(jie)(jie)加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(latrolet)、彎頭(tou)(tou)加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)(elbolet)以及馬鞍座(sweepolet)加(jia)(jia)強(qiang)(qiang)管(guan)(guan)接(jie)(jie)頭(tou)(tou)。
典型(xing)加(jia)強(qiang)(qiang)(qiang)管(guan)接(jie)頭(tou)如圖(tu)4.6.14所示(shi)(shi)。這(zhe)些加(jia)強(qiang)(qiang)(qiang)管(guan)接(jie)頭(tou)可直接(jie)焊(han)在主(zhu)管(guan)上,與三通一樣(yang)從主(zhu)管(guan)上引出支管(guan),不需(xu)另(ling)外補強(qiang)(qiang)(qiang),適用于高(gao)、中壓管(guan)道。國內(nei)有化工(gong)標準HG/T 21632《鍛鋼承插(cha)焊(han)螺紋和對焊(han)接(jie)管(guan)臺》。圖(tu)4.6.14(e)所示(shi)(shi)的(de)(de)插(cha)入加(jia)強(qiang)(qiang)(qiang)管(guan)接(jie)頭(tou)(insert weldolet)、彎頭(tou)加(jia)強(qiang)(qiang)(qiang)管(guan)接(jie)頭(tou)(elbolet)以(yi)及(ji) sweepolet加(jia)強(qiang)(qiang)(qiang)管(guan)接(jie)頭(tou)與主(zhu)管(guan)連(lian)接(jie)的(de)(de)焊(han)縫可進行無損探傷檢查,焊(han)接(jie)可靠,克(ke)服了(le)“馬鞍(an)焊(han)”的(de)(de)角焊(han)縫質量不易保證、檢查困(kun)難的(de)(de)缺點,適用于火災危險分類(lei)(lei)為甲、乙類(lei)(lei)介質和劇(ju)毒介質的(de)(de)管(guan)道,是理(li)想的(de)(de)管(guan)接(jie)頭(tou)。圖(tu)4.6.14(f)所示(shi)(shi)是承插(cha)焊(han)和螺紋連(lian)接(jie)的(de)(de)變(bian)徑管(guan)接(jie)頭(tou),用于DN50以(yi)下管(guan)道及(ji)其管(guan)配件的(de)(de)連(lian)接(jie)。

例如:某項目的材料描述為“WELDOLET DN 800×15,Sch80>800×15 ,Sch80×1600”,意思是:主管規格是DN800,Sch80,支管規格是:DN15,Sch160。

