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1、1．適用范圍scope本工藝適用于SEVAN650各種管路系統(tǒng)中，碳鋼管、碳錳鋼管子的制作。Thisprocedureisapplicabletothesteelpipes,carbonmanganesesteelpipesproductionofvariouspipelinesystemforSEVAN6502、準(zhǔn)備工作preparations2.1材料準(zhǔn)備Materialspreparation2.1.1管子按圖紙要求選用合適的管材Selectionofthepipesaccordingtotherequirementso
2、fdrawings2.1.2根據(jù)管子的材料選用合適的切割方法。Chooseanappropriatemethodofcuttingaccordingtothepipematerial。2.1.3鋼管的切割一律使用帶鋸、相貫線切割機(jī)完成，對(duì)于需要修正的管子通徑小于32mm不允許使用氣割進(jìn)行，通徑大于32mm的可使用氣割完成修正。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應(yīng)符合下列要求：Theverticaldegreebetweenpipeendsandthepipeoutersurfacesshouldmeetthefollowingrequirements:表一管子公稱直徑mm垂直度NominaldiameterVerticaldegree≤100≤1>100-200≤2>200≤32.1.5管子的內(nèi)壁不允許有氧化渣和切割飛濺，切割面要全面進(jìn)行清潔，清潔的長度從切割面起不得小于50mm。
4、Thepipeinnersurfaceisnotallowedoxideslagandcuttingspatter,cuttingsurfaceneedacomprehensivecleaning,andcleaninglengthfromthecuttingfacenotlessthan50mm.2.2根據(jù)圖紙要求選用符合要求的校管附件。Selectaccessoriesofpipereshapingandpositioningwhichmeettherequirementsofdrawings.2.3管子的彎制bendin
5、gofpipe2.3.1根據(jù)管子零件圖要求選用合適的彎模以及相關(guān)的模具（本海工產(chǎn)品彎曲半徑為3倍的管子外徑）Selectsuitablebendingmodulusaccordingtothepipepartsdrawings.(Bendingradiusofthreetimesthepipesoutsiderdiameter)2.3.2管子彎曲成型后橢圓度為小于等于7%Ellipticity≤7%afterbending2.3.3管子彎曲成型后管子的縮頸率不小于95%Neckdownrate≥95%afterbending2
6、.3.4管子彎曲成型后，管子壁厚的減薄量為對(duì)應(yīng)標(biāo)準(zhǔn)棺材壁厚負(fù)偏差的20%Thereductioninwallthicknessisthenegativedeviation20%ofcorrespondingstandardpipewallthicknessafterbending2.3.5管子彎曲成型后，管子彎曲處無皺褶、刻痕Withoutpleatsandnotchafterbending3、拼接裝配的技術(shù)要求TechnicalRequirements3.1裝悍法蘭Installingandweldingflanges3.1
7、.1法蘭（GB2506-89）的裝配型式參照下圖法蘭連接形式的要求AssembleFlange(GB2506-89)accordingtofollowingassemblydiagram:L8/K9K10/K11L10管子K8/K9K10/K11L10管子通徑通徑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
