管子拼接工艺

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1、1．适用范围scope本工艺适用于SEVAN650各种管路系统中，碳钢管、碳锰钢管子的制作。Thisprocedureisapplicabletothesteelpipes,carbonmanganesesteelpipesproductionofvariouspipelinesystemforSEVAN6502、准备工作preparations2.1材料准备Materialspreparation2.1.1管子按图纸要求选用合适的管材Selectionofthepipesaccordingtotherequirementso

2、fdrawings2.1.2根据管子的材料选用合适的切割方法。Chooseanappropriatemethodofcuttingaccordingtothepipematerial。2.1.3钢管的切割一律使用带锯、相贯线切割机完成，对于需要修正的管子通径小于32mm不允许使用气割进行，通径大于32mm的可使用气割完成修正。Pipeshouldbecutwithbandsaw,theintersectionlinecuttingmachine.Forpipe(DN≥32mm)whichdemandmodifyingallow

3、tomodifyingwithgascutting.2.1.4管子切割后，管子端面和管子外表面的垂直度应符合下列要求：Theverticaldegreebetweenpipeendsandthepipeoutersurfacesshouldmeetthefollowingrequirements:表一管子公称直径mm垂直度NominaldiameterVerticaldegree≤100≤1>100-200≤2>200≤32.1.5管子的内壁不允许有氧化渣和切割飞溅，切割面要全面进行清洁，清洁的长度从切割面起不得小于50mm。

4、Thepipeinnersurfaceisnotallowedoxideslagandcuttingspatter,cuttingsurfaceneedacomprehensivecleaning,andcleaninglengthfromthecuttingfacenotlessthan50mm.2.2根据图纸要求选用符合要求的校管附件。Selectaccessoriesofpipereshapingandpositioningwhichmeettherequirementsofdrawings.2.3管子的弯制bendin

5、gofpipe2.3.1根据管子零件图要求选用合适的弯模以及相关的模具（本海工产品弯曲半径为3倍的管子外径）Selectsuitablebendingmodulusaccordingtothepipepartsdrawings.(Bendingradiusofthreetimesthepipesoutsiderdiameter)2.3.2管子弯曲成型后椭圆度为小于等于7%Ellipticity≤7%afterbending2.3.3管子弯曲成型后管子的缩颈率不小于95%Neckdownrate≥95%afterbending2

6、.3.4管子弯曲成型后，管子壁厚的减薄量为对应标准棺材壁厚负偏差的20%Thereductioninwallthicknessisthenegativedeviation20%ofcorrespondingstandardpipewallthicknessafterbending2.3.5管子弯曲成型后，管子弯曲处无皱褶、刻痕Withoutpleatsandnotchafterbending3、拼接装配的技术要求TechnicalRequirements3.1装悍法兰Installingandweldingflanges3.1

7、.1法兰（GB2506-89）的装配型式参照下图法兰连接形式的要求AssembleFlange(GB2506-89)accordingtofollowingassemblydiagram:L8/K9K10/K11L10管子K8/K9K10/K11L10管子通径通径正常最正最正最正常最正最正最DNDNNormal大常大常大Normal大常大常大DN201.5a6a+15DN200a121.5a15a+113DN251.5a6a+15DN250a121.5a15a+113DN321.5a6a+16DN300a121.5a15a+1

8、13DN40a51.5a7a+16DN350a141.5a18a+115DN50a51.5a7a+16DN400a141.5a18a+115DN65a81.5a10a+19DN450a141.5a18a+115DN80a81.5a10a+19DN500a191.5a24a+1