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首页 NACE SP0206-2006《干气管道内腐蚀直接评价标准》

NACE SP0206-2006《干气管道内腐蚀直接评价标准》.pdf

NACE SP0206-2006《干气管道内腐蚀直接评价标准》

zhaoyf0211
2012-08-06 0人阅读 举报 0 0 暂无简介

简介:本文档为《NACE SP0206-2006《干气管道内腐蚀直接评价标准》pdf》,可适用于工程科技领域

StandardPracticeInternalCorrosionDirectAssessmentMethodologyforPipelinesCarryingNormallyDryNaturalGas(DGICDA)ThisNACEInternationalstandardrepresentsaconsensusofthoseindividualmemberswhohavereviewedthisdocument,itsscope,andprovisionsItsacceptancedoesnotinanyrespectprecludeanyone,whetherheorshehasadoptedthestandardornot,frommanufacturing,marketing,purchasing,orusingproducts,processes,orproceduresnotinconformancewiththisstandardNothingcontainedinthisNACEInternationalstandardistobeconstruedasgrantinganyright,byimplicationorotherwise,tomanufacture,sell,oruseinconnectionwithanymethod,apparatus,orproductcoveredbyLettersPatent,orasindemnifyingorprotectinganyoneagainstliabilityforinfringementofLettersPatentThisstandardrepresentsminimumrequirementsandshouldinnowaybeinterpretedasarestrictionontheuseofbetterproceduresormaterialsNeitheristhisstandardintendedtoapplyinallcasesrelatingtothesubjectUnpredictablecircumstancesmaynegatetheusefulnessofthisstandardinspecificinstancesNACEInternationalassumesnoresponsibilityfortheinterpretationoruseofthisstandardbyotherpartiesandacceptsresponsibilityforonlythoseofficialNACEInternationalinterpretationsissuedbyNACEInternationalinaccordancewithitsgoverningproceduresandpolicieswhichprecludetheissuanceofinterpretationsbyindividualvolunteersUsersofthisNACEInternationalstandardareresponsibleforreviewingappropriatehealth,safety,environmental,andregulatorydocumentsandfordeterminingtheirapplicabilityinrelationtothisstandardpriortoitsuseThisNACEInternationalstandardmaynotnecessarilyaddressallpotentialhealthandsafetyproblemsorenvironmentalhazardsassociatedwiththeuseofmaterials,equipment,andoroperationsdetailedorreferredtowithinthisstandardUsersofthisNACEInternationalstandardarealsoresponsibleforestablishingappropriatehealth,safety,andenvironmentalprotectionpractices,inconsultationwithappropriateregulatoryauthoritiesifnecessary,toachievecompliancewithanyexistingapplicableregulatoryrequirementspriortotheuseofthisstandardCAUTIONARYNOTICE:NACEInternationalstandardsaresubjecttoperiodicreview,andmayberevisedorwithdrawnatanytimeinaccordancewithNACEtechnicalcommitteeproceduresNACEInternationalrequiresthatactionbetakentoreaffirm,revise,orwithdrawthisstandardnolaterthanfiveyearsfromthedateofinitialpublicationTheuseriscautionedtoobtainthelatesteditionPurchasersofNACEInternationalstandardsmayreceivecurrentinformationonallstandardsandotherNACEInternationalpublicationsbycontactingtheNACEInternationalFirstServiceDepartment,SouthCreekDr,Houston,Texas(telephone)ApprovedNACEInternationalSouthCreekDrHouston,Texas()ISBN©,NACEInternationalNACESPItemNo免费标准下载网(wwwfreebznet)SPNAForewordThisstandardpracticeformalizesamethodologytermedinternalcorrosiondirectassessmentforpipelinescarryingnormallydrynaturalgas(DGICDA),,thatcanbeusedtohelpensurepipelineintegrityThemethodologyisapplicabletonaturalgaspipelinesthatnormallycarrydrygas,butmaysufferfrominfrequent,shorttermupsetsofliquidwater(orotherelectrolyte)ThisstandardisintendedforusebypipelineoperatorsandotherswhomanagepipelineintegrityThebasisofDGICDAisadetailedexaminationoflocationsalongapipelinewherewaterwouldfirstaccumulateandprovidesinformationaboutthedownstreamconditionofthepipelineIfthelocationsalongalengthofpipemostlikelytoaccumulatewaterhavenotcorroded,otherdownstreamlocationslesslikelytoaccumulatewatermaybeconsideredfreefromcorrosionThepresenceofextensivecorrosionfoundatmanylocationsduringtheevaluationsuggeststhatthetransportedgaswasnotnormallydry,andthisstandardisnotconsideredapplicableDGICDAmethodologyfornaturalgassystemsisdescribedintermsofafourstepprocessTheDGICDAmethodprovidesthegreatestbenefitforpipelinesthatcannotbeinlineinspectedhowever,themethodisnotlimitedtounpiggablepipelinesSamplefielddataareprovidedinAppendixA(nonmandatory)toillustrateanexampleapplicationofDGICDAAppendixB(nonmandatory)providesexampleregiondefinitionsThisstandardwaspreparedbyTaskGroup(TG)onPipelineDirectAssessmentMethodologyTGisadministeredbySpecificTechnologyGroup(STG)onPipelines,Tanks,andWellCasingsThisstandardisissuedbyNACEInternationalundertheauspicesofSTGInNACEstandards,thetermsshall,must,should,andmayareusedinaccordancewiththedefinitionsofthesetermsintheNACEPublicationsStyleManual,thed,ParagraphShallandmustareusedtostatemandatoryrequirementsThetermshouldisusedtostatesomethinggoodandisrecommendedbutisnotmandatoryThetermmayisusedtostatesomethingconsideredoptionalCEInternationali免费标准下载网(wwwfreebznet)SPiiNACEInternationalStandardPracticeInternalCorrosionDirectAssessmentMethodologyforPipelinesCarryingNormallyDryNaturalGas(DGICDA)ContentsGeneralDefinitionsPreAssessmentIndirectInspectionDetailedExaminationsPostAssessmentDGICDARecordsReferencesBibliographyAppendixA:ExampleDGICDAApplication(Nonmandatory)AppendixB:ExampleRegionDefinition(Nonmandatory)Figurea:DryGasInternalCorrosionDirectAssessmentFlowChartFigureb:DryGasInternalCorrosionDirectAssessmentFlowChartFigurec:DryGasInternalCorrosionDirectAssessmentFlowChartFigureA:Exampleinclinationandelevationprofiles,withcriticalinclinationanglesFigureA:Exampleinclinationprofile,gasflowingsouthtonorth(firstkmmiles)FigureA:Exampleinclinationprofile,gasflowingnorthtosouth(firstkmmiles)FigureB:IllustrationofICDARegionDefinitionsTable:EssentialDataforUseofDGICDAMethodologyTableA:ExampleConditionsTableA:ExampleInspectionResultsNACEInternational免费标准下载网(wwwfreebznet)SP()NACEInternationalASMEInternational(ASME),ThreeParkAve,NewYork,NY,()AmericanPetroleumInstitute(API),LStNW,Washington,DC()AmericanNationalStandardsInstitute(ANSI),WndSt,NewYork,NY()BritishStandardsInstitute(BSI),BritishStandardsHouse,ChiswickHighRd,LondonWAL,UnitedKingdomIntroductionThisstandardcoverstheNACEinternalcorrosiondirectassessment(ICDA)processfornormallydrynaturalgaspipelinesystemsThisstandardisintendedtoserveasaguideforapplyingtheNACEDGICDAprocessonnaturalgaspipelinesystemsthatmeetthefeasibilityrequirementsofParagraphofthisstandardTheprimarypurposesoftheDGICDAmethodare()toenhancetheassessmentofinternalcorrosioninnaturalgaspipelines,and()toensurepipelineintegrityDGICDAwasdevelopedfornaturalgaspipelinesthatnormallycarrydrygas,butmaysufferfrominfrequentshorttermupsetsofwaterBecauseofthis,DGICDAisnotapplicabletowetgatheringandproducingpipelinesOnebenefitoftheDGICDAapproachisthatanassessmentcanbeperformedonapipesegmentforwhichalternativemethods(eg,inlineinspection(ILI),hydrostatictesting,etc)maynotbepracticalThebasisofDGICDAforgaslinesisadetailedexaminationoflocationsalongapipelinewherewaterorotherelectrolytefirstaccumulates,allowinginferencestobemadeabouttheintegrityoftheremainingdownstreamlengthofpipeIfthelocationsalongalengthofpipethataremostlikelytoaccumulatewaterhavenotcorroded,otherlocationslesslikelytoaccumulatewaterareunlikelytohavesufferedcorrosionwhenoperatingunderthesameconditionsIdentifyingareasinwhichinternalcorrosion(orthepotentialforfutureinternalcorrosion)exists,andconversely,whereinternalcorrosionisunlikely,mayalsobeincorporatedintocorrosionintegrityandriskmanagementplansIntheprocessofapplyingDGICDA,otherpipelineintegritythreats,suchasexternalcorrosion,mechanicaldamage,stresscorrosioncracking(SCC),etc,maybedetectedWhensuchthreatsaredetected,additionalassessmentsorinspectionsmustbeperformedThepipelineoperatorshouldutilizeappropriatemethodstoaddressrisksotherthaninternalcorrosion,suchasthosedescribedinNACE免费标准下载网(wstandards,ASME()B,API(),ANSI()API,andBS(),internationalstandards,andotherdocumentsTheDGICDAmethodologyassessesthelikelihoodofinternalcorrosionandincludesexistingmethodsofexaminationavailabletoapipelineoperatortodeterminewhetherinternalcorrosionisactuallypresent,ormayoccurDGICDAusesflowmodelingresultsandprovidesaframeworktoutilizethosemethodsDGICDAhaslimitations,andnotallpipelinescanbesuccessfullyassessedwithDGICDATheselimitationsareidentifiedinthepreassessmentstepForaccurateandcorrectapplicationofthisstandard,itshallbeusedinitsentiretyUsingorreferringtoonlyspecificparagraphsorsectionscanleadtomisinterpretationormisapplicationoftherecommendationsandpracticescontainedhereinThisstandarddoesnotdesignatepracticesforeveryspecificsituationbecauseofthecomplexityofinternalconditionsthatmaybepresentinvariouspipelinesystemsThisstandarddoesnotaddressspecificremedialactionsthatmaybetakenwhencorrosionisfoundhowever,thereaderisreferredtoASMEBandotherrelevantdocumentsforguidanceTheprovisionsofthisstandardshallbeappliedbyorunderthedirectionofcompetentpersonswho,byreasonofknowledgeofthephysicalsciencesandtheprinciplesofengineeringandmathematics,acquiredbyeducationandrelatedpracticalexperience,arequalifiedtoengageinthepracticeofcorrosioncontrolandriskassessmentonpipelinesystemsSuchpersonsmaybe()registeredprofessionalengineers,()recognizedascorrosionspecialistsbyorganizationssuchasNACE,or()professionals(ie,engineersortechnicians)withprofessionalexperienceincludingdetectionmitigationofinternalcorrosionandevaluationofinternalcorrosiononpipelinesFourStepProcessDGICDArequirestheintegrationofdatafrommultiplefieldexaminationsandinternalpipesurfaceevaluations,includingthepipeline’sphysicalcharacteristicsandoperatinghistorySection:Generalwwfreebznet)SPAflowchartthatillustratesthecomponentsofeachstepisshowninFigureStepPreassessmentStepIndirectInspectionInternalCorrosionThreatDataCollectionSufficientDataCandatabeobtainedorassumedFeasibilityEstablishedDefineEachDGICDARegionDGICDAnotapplicable,backtodetermineassessmentmethodInputonEssentialData,TableSelectIndirectInspectionTools,DefineCriticalInclinationAnglesforEachRegionDetermineInclinationProfileforEachRegionSelectSitesforDetailedExaminationandCompareandAnalyzeResultsToDETAILEDEXAMINATIONSFeedbackInputonToolSelectionforFlowModelingandInclinationProfileCalculationsAcceptRejectYesNoNoNoYesYesInputonRegionIdentificationCriteriaFIGUREa:DryGasInternalCorrosionDirectAssessmentFlowChartNumbersrefertoparagraphnumbersinthisstandardRejectNACEInternational免费标准下载网(wwwfreebznet)SPFIGUREb:DryGasInternalCorrosionDirectAssessmentFlowChartNumbersrefertoparagraphnumbersinthisstandardNACEInternational免费标准下载网(wwwfreebznet)SPFIGUREc:DryGasInternalCorrosionDirectAssessmentFlowChartNumbersrefertoparagraphnumbersinthisstandardNACEInternational免费标准下载网(wwwfreebznet)SPandidentifyingsiteswhereinternalcorrosionmaydwfyenclendndndomnLheonigNACEInternationalDefinedLength:AnylengthofpipeuntilanewinletintroducesthepossibilityofwaterenteringthepipelineDirectAssessment:AstructuredprocessforpipelineoperatorstoassesstheintegrityofpipelinesDetailedExamination:ExaminationofthepipewallataspecificlocationtodeterminewhethermetallossfrominternalcorrosionhasoccurredThismaybeperformedusingvisual,ultrasonic,radiographic,orothermeansDryGas:AgasaboveitsdewpointandwithoutcondensedliquidsDryGasInternalCorrosionDirectAssessment(DGICDA):TheinternalcorrosiondirectassessmentprocessasIeIIicItcp免费标准下载网(wwwlinationAngle:Anangleresultingfromachangeinvationbetweentwopointsonapipeline,indegreesication:AnymeasureddeviationfromthenormirectInspection:UseoftoolstoexamineapipelineirectlyForDGICDA,itconsistsofcalculatingandparingflowmodelingresultswithaninclinationprofileineInspection(ILI):TheinspectionofapipelinefrominteriorofthepipeusinganILItoolThetoolsusedtoductILIareknownaspigs,smartpigs,orintelligentsefinedasthepipelengthbetweentwoinclinationanglesathichcorrosionisfoundorthestartoftheregionandtheirstinclinationangleHydrostaticTesting:TestingofsectionsofapipelinebfillingthepipelinewithwaterandpressurizingituntilthnominalhoopstressesinthepipereachaspecifiedvalueDGICDAincludesthefollowingfoursteps:Preassessmentcollectsessentialhistoricandpresentoperatingdataaboutthepipeline,determineswhetherDGICDAisfeasible,andthendefinesICDAregionsThetypesofdatatobecollectedaretypicallyavailableindesignandconstructionrecords,operatingandmaintenancehistories,alignmentsheets,corrosionsurveyrecords,gasandliquidanalysisreports,andinspectionreportsfrompriorintegrityevaluationsormaintenanceactionsIndirectinspectioncoversmultiphaseflowpredictions,developingapipelineelevationprofile,Section:DefinitAnomalies:SeeIndicationCleaningPig:AdeviceinsertedinapipelineforcleaningsolidsordisplacingliquidsfromwithinapipelineAspheroidimplementusedtodisplaceliquidhydrocarbonsfromnaturalgaspipelinesCorrosion:Thedeteriorationofamaterial,usuallyametal,thatresultsfromareactionwithitsenvironmentCriticalInclinationAngle:AngledeterminedbyDGICDAflowmodelingthelowestangleatwhichliquidcarryoverisnotexpectedtooccurunderstratifiedflowconditionsDGICDARegion:Acontinuouslengthofpipe(includingweldjoints)uninterruptedbyanysignificantchangeinwaterorflowcharacteristicsthatincludessimilarphysicalcharacteristicsoroperatinghistoryDGICDASubregion:Acontinuouslengthofpipe(includingweldjoints)containedinaDGICDAregion,bepresentDetailedexaminationincludesperformingexcavationsandconductingdetailedexaminationsofthepipetodeterminewhethermetallossfrominternalcorrosionhasoccurredPostassessmentcoversanalysisofdatacollectedfromthepreviousthreestepstoassesstheeffectivenessoftheDGICDAprocessanddeterminereassessmentintervalsionsdefinedinthisstandardapplicabletonormallydrygassystemsFuturedocumentsmayaddressICDAforwetgasandliquidhydrogensystemsElectrolyte:AchemicalsubstancecontainingionsthatmigrateinanelectricfieldExternalCorrosionDirectAssessment(ECDA):Afourstepprocessthatcombinespreassessment,indirectinspections,directexaminations,andpostassessmenttoevaluatetheimpactofcorrosionoccurringontheoutsidewallofapipeupontheintegrityofapipelineFluid:AsubstancethatdoesnotpermanentlyresistdistortionBothliquidsandgasesarefluidsGatheringSystem:Pipelineandrelatedfacilitiestocollectandmoveproducedgasprogressivelystartingfromindividualwellstoatrunk,common,ormainlineProducedgasmaynotmeetgasqualityspecificationstypicalofgastransmissionsys

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NACE SP0206-2006《干气管道内腐蚀直接评价标准》

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