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BASFMDIComplexChongqingProjectMultiDisciplineConstructionTheThirdChemicalEngineeringContractNo:CO-CQ5522-92L-012ConstructionCompanyofChinaRev.03,25.May.2013FileNo:MDI-TCC-92L012-MS-039Page1of11ProjectQualityManagementPreheatingandPostWeldingHeatTreatmentProcedure焊前预热与焊后热处理方案PreheatingandPostWeldingHeatTreatmentProcedureMDI-TCC-92L012-MS-039325.May.2013RevisedasTMDIcomments218.Apr.2013RevisedasTMDIcommentsGAOBINXIAKAOFEIZHAOQI18,Mar,2013RevisedasTMDIcommentsGAOBINXIAKAOFEIZHAOQI014,Jan,2013IssueforapprovalGAOBINXIAKAOFEIZHAOQIRevisionDateRevisionDescriptionPreparedByReviewedByApprovedByBASFMDIComplexChongqingProjectMultiDisciplineConstructionTheThirdChemicalEngineeringContractNo:CO-CQ5522-92L-012ConstructionCompanyofChinaRev.03,25.May.2013FileNo:MDI-TCC-92L012-MS-039Page2of11ProjectQualityManagementPreheatingandPostWeldingHeatTreatmentProcedure目录Contents1.概述General△32.编制依据References△33.焊前预热与焊后热处理执行程序和计划PWHTExecutionPlanandProcedure△34.硬度检查和无损检测HardnessTestandRT△35.标识管理MarksManagement6.附件AttachmentsBASFMDIComplexChongqingProjectMultiDisciplineConstructionTheThirdChemicalEngineeringContractNo:CO-CQ5522-92L-012ConstructionCompanyofChinaRev.03,25.May.2013FileNo:MDI-TCC-92L012-MS-039Page3of11ProjectQualityManagementPreheatingandPostWeldingHeatTreatmentProcedure1.概述General为了降低和消除管道焊接应力，防止出现应力腐蚀裂纹。应用电加热的方法对焊缝进行热处理，热处理适用于碳钢(t19mm)、和输送介质代码为701、702管道的管子、管件。我公司施工范围内的需要热处理的有A672-C60、A106-B两种材质。Theprocedureispreparedtoreduceoreliminatetheweldingstressofpipeandavoidstresscorrosioncracking.Dotheheattreatmentfortheweldingseamsbyusingtheelectricalheatingmethod.Theheattreatmentissuitableforthecarbonsteel(t19mm),pipeandfittingwhichcodeforconveyingmediumis701and701.Therearetwomaterials(A672-C60andA106-B)needtodotheheattreatmentwithintheconstructionscopewhichisconductedbyTCC.2.编制依据References2.1．GB/T20801-2006压力管道规范-工业管道Pressurepipingcode—Industrialpiping.2.2．GEN-0-PIPE-SP-0052预制/现场管道的焊接与无损检测规范Codeforprefabrication/sitepipeweldingandnondestructiveexamination.2.3．GEN-0-TECH-SP-0008焊接制作的基本要求Generalrequirementsforweldingfabrication2.4ASMEB31.3-2010工艺管道processpipe2.5热处理和无损检测地上管道汇总表(REVNO.1A)Thesummarysheetofheattreatment&nondestructiveexaminationforA/Gpipe(REVNO.1A)3.0焊前预热与焊后热处理执行程序和计划PWHTExecutionPlanandProcedure3.1焊前预热Preheating3.1.1需要预热的碳钢焊口外径≥219mm或壁厚≥20mm的管子采用电加热，电加热时用控温箱记录预热的温度并做好预热的温度曲线。Theexternaldiameterofcarbonsteelweldedjunctionwhichareneeddotheheattreatment≥219mmorthepipewhichthicknessofshell≥20mmneeduseheattreatment.Recordthepreheatingtemperaturebyusingtemperaturecontrollingboxandthepreheatingtemperaturecurveduringtheelectricalheating.3.1.2所有需要预热的焊口如焊接时中断后继续焊接的焊口应重新预热。Forallpreheatrequiredweldingjunctions,suchastheweldingjunctionwhichisre-weldingafterinterruptingneedtobepreheatedagain.3.1.3工程中需要预热的管线支管、管座，应优先采用液化石油气火焰预热，预热要求BASFMDIComplexChongqingProjectMultiDisciplineConstructionTheThirdChemicalEngineeringContractNo:CO-CQ5522-92L-012ConstructionCompanyofChinaRev.03,25.May.2013FileNo:MDI-TCC-92L012-MS-039Page4of11ProjectQualityManagementPreheatingandPostWeldingHeatTreatmentProcedure和相同公称直径的管子一样，加热区以外100mm应予以保温。Forthebranchpipeofpipelineandpipeseatduringconstruction,shallbepreheatedbyusingliquefiedpetroleumflamepriority.Therequirementofpreheatisthesameasthepipewhichhasthesamenominaldiameter.Conducttheinsulationforthe100mmoutsidetheheatingarea.3.1.4法兰块预热用块状式红外线高温陶瓷加热器，加热器用铁丝固定在法兰内部。Thepreheatingfortheflangeshalluseinfraredradiationhightemperatureceramicheaterwhichisblocktype.Fixtheheaterinsideoftheflangebywire.3.1.5预热时应在坡口两侧均匀进行加热，预热范围应以坡口中心两侧各不小于壁厚的3倍，且不小于100mm.Whenpreheating,dotheevenheatingatthetwosidesofgroove.Thepreheatingrangeshallbegroove-centered,bothofthetwosidesshallnolessthan3timesofshellthicknessand100mm.3.1.6预热温度见下表thepreheatingtemperatureisshowninbelowtable:MaterialtypeWeldthroatthickness(mm)Minimumpreheattemperature(°C)Carbonsteelt≤12.71012.7t≤258025t≤501003.2焊后热处理PostweldHeatTreatment3.2.1焊接完的需要进行热处理的焊口，应在焊接外观检查合格后进行热处理,热处理时管口应封闭;另外为了防止和降低热处理高温对阀门和仪表的负面影响，凡需要热处理的管线上，焊口附近阀门、流量计、调节阀、仪表原则上应予以拆除，对于不能拆除的部分应使其处于全开状态。Afterwelding,fortheheattreatmentrequiredweldingjunction,shallbedotheheattreatmentaftertheweldingvisualinspectionisqualified.Theopenendsofpipeshallbesealedduringheattreatment.Besides,inordertoavoidandreducethenegativeeffectforvalveandinstrumentfromthehightemperatureofheattreatment.Forthepipelineswhichrequireheattreatment,inprinciple,dismantlethevalve,flowmeter,regulatingvalveandinstrumentnearbytheweldingjunction.Butforthepartswhichcannotbedismantled,shallkeeptheminthestateoffullyopened.3.2.2采用电阻加热法，一般原则（NPS＞2″）选用履带式加热器、（NPS＜2″）绳型加热器，外包保温棉。所使用的温度显示仪表、记录仪表必须经过计量检查合格。Thegeneralprincipleistochosethecrawlerheater(NPS＞2″)andcordtypeheater（NPS＜2″）andwraptheinsulatingcottonoutsidefortheresistanceheatingmethod.Theusedtemperaturedisplayinstrumentandrecordinstrumentmustbemeasuringinspectedandqualified.3.2.3A672-C60、A106B管道热处理温度范围参照巴斯夫项目规范GEN-0-TECH-SP-0008，具体的热处理参数见热处理工艺卡。Thetemperatureofpipingheattreatment(A672-C60、A106B)referstotheBASFprojectspecificationGEN-0-TECH-SP-0008,thedetailparametersforheattreatmen