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1、Proceedingsofthe201611thInternationalPipelineConferenceIPC2016September26-30,2016,Calgary,Alberta,CanadaIPC2016-64341ACASESTUDYONTHEAPPLICATIONOFSTRUCTURALRELIABILITYANALYSISTOASSESSINTEGRITYFORINTERNALCORROSIONOFUNPIGGABLEPIPELINESKatherineTaylorSusannahTurnerGraha
2、mGoodfellowPenspenLtdPenspenLtdPenspenLtdNewcastleuponTyne,UKNewcastleuponTyne,UKNewcastleuponTyne,UKABSTRACTexternalinspectionsofunpiggablelinesanddatasetsfromOperatorswishtounderstandtheconditionoftheircomparablepiggablelines.Probabilitydistributionsarederivedpipe
3、linestomanageongoingintegrity.InformationonthefromtheavailableinspectiondatafortheinternalcorrosionconditionofthepipelinealongitsentirelengthcanbeobtainedfeaturesizeandcorrosionrateinputparameterstotheSRA.usingin-lineinspection(ILI).However,somepipelinescannotProbab
4、ilisticanalysisisusedtoaccountfortheexpectedbeinternallyinspecteddue,forexample,toteeconnections,populationofunknownfeaturesintheuninspectedpartsofthetightbends,lowflowortoalackoflauncherandreceiverpipelines.Theexpectedfeaturesize,corrosionrateandfeaturefacilities.T
5、heconditionofthese‘unpiggable’linescandensitycalculatedareusedintheSRAtoestimatethetotalsometimesbelargelyunknown.ToaidtheunderstatingoftheprobabilityoffailureduetointernalcorrosionovertimeforthepipelineconditionwithoutILIdata,operatorswilloftenrelyonentirelengthoft
6、hepipeline.Recommendationsareprovidedonalternativesourcesofinformation,suchaslocalisedexternaltheapplicationofanSRAmethodologytoassesspipelineinspections,modelpredictionsandcompanyandindividualfailureduetointernalcorrosion.experience.However,theremaybesignificantunc
7、ertaintyassociatedwiththesealternativedatasourceswhenusingthemINTRODUCTIONtoassesstheconditionoftheentirepipeline.ThisuncertaintyIn2014,thePipelineandHazardousMaterialsSafetymaybeunderstoodbyapplyingaprobabilisticapproachtotheAdministration(PHMSA)reportedthatinterna
8、lcorrosionassessmentofpipelineintegrityusingstructuralreliabilityaccountedfor10.1%ofpipelineincidents[4];almostdoubletheanalysis(SRA)metho
