Ahmad_2010_Thermal-fatigue-and-corrosion-fatigue-in-heat-recovery-area-wall-side-tubes.pdf

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1、EngineeringFailureAnalysis17(2010)334–343ContentslistsavailableatScienceDirectEngineeringFailureAnalysisjournalhomepage:www.elsevier.com/locate/engfailanalThermalfatigueandcorrosionfatigueinheatrecoveryareawallsidetubesab,*aJ.Ahmad,J.Purbolaksono,L.C.BengaKaparEnergyVenturesSdnBhd,JalanT

2、okMuda,Kapar42200,MalaysiabDepartmentofMechanicalEngineering,UniversitiTenagaNasional,Km7JalanKajang-Puchong,Kajang43009,Selangor,MalaysiaarticleinfoabstractArticlehistory:Inthispaper,findingsofvisualinspections,chemicalanalysisondeposits,metallurgicalReceived12June2009examinationsandcree

3、panalysisonthefailedSA210-A1heatrecoveryarea(HRA)wallsideAccepted13June2009tubesofaboilerunitarepresented.TheinvestigationswerecarriedoutfollowingtwoAvailableonline17June2009boilertubefailuresatheatrecoveryareasinvolvingthelefthandside(LHS)andrighthandside(RHS)sidewalltubes.Findingsfromt

4、hemicroscopicexaminationsareusedtosupportKeywords:theinvestigationindeterminingthefailuremechanisms.ThefirstfailureatLHSHRAsideHeatrecoveryareawalltubeisidentifiedduetothermalfatiguewhilethesecondfailureisasaresultofcom-Thermalfatiguebinationofthecorrosionfatigue,thermalfatigueandcreepdama

5、ge.RecommendationsareCorrosionfatigueMetallurgicalexaminationmadetoreduceunavailabilityoftheboilerunitduetotheHRAsidewalltubefailures.VisualinspectionÓ2009ElsevierLtd.Allrightsreserved.1.IntroductionThermalfatigueandcorrosionfatigueareamongthetop10causesoffailureinboilerindustriesasrepor

6、tedbyFrench[1].Theycontributedabout13.9%oftheoverallfailures.PortandHerro[2]alsoparticularlydiscussedboilertubefailuresduetocorrosion-fatiguecracking.Corrosionfatiguecanoccurinanylocationwheretheoperationalcyclicstresseshavesufficientmagnitude.Waterwalltubesareamongthecommonlocationsofexp

7、eriencingcorrosion-fatiguecracks.Thisworkpresentstheinvestigationsontwoboilertubefailuresatheatrecoveryareasinvolvingthelefthandside(LHS)andrighthandside(RHS)sidewalltubesofaboilerunitatKaparPowerStationMalaysia.FailurelocationsintheboilerunitareindicatedinFig.1.Visualins