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+ISGECHitachiZosenLimitedCaseStudy"ANSYS'userprogrammablefeature(UPF)wasusedtocreateacreepsubroutinebasedonASMEcodecase2605,whichallowedustoevaluatethecreepdamageofpressureequipmentatelevatedtemperaturesinhighstrengthchrome-molysteels.
"BalramKalraAssistantManager-PEDDesignISGECHitachiZosenLimitedWiththerisingdemandforcost-eectivedesignsofstructuralcomponentsintheoilandgassec-tor,manufacturerswanttoutilizethemaximumtemperaturecapa-bilityofthematerials.
ThecurrentASMEcode(SectionVIII,Division2)limitsthegenerationoffatiguecurvesuptoamaximumof371°C.
ASMECodeCase2605isaspecialruleusedintheindustryworldwideforfatigueevaluationof2.
25Cr-1Mo-0.
25Vsteelsattemperaturesgreaterthan371°Candlessthan454°C.
ChallengesCodeCase2605proposescarry-ingoutfullinelasticanalysis,suchasratchetingelasticshakedownanalysis,usingtheactualtime-dependentthermalandmechani-calloadinghistograms.
Treatingplasticityandcreepastwoindepen-dentphenomenainstressandstraincalculationsusingspreadsheet-likeapplicationsaresubjecttohumanerrorandmayleadtounrealisticdamageparameters.
ThechallengewastocreateacreepsubroutinecapableofanalysisatthehighertemperaturesofCodeCase2605usingANSYSsimulationsolutionstoincreaseaccuracyandacceleratecalculations.
TechnologyUsedANSYSMAPDLCaseStudyUtilizingthemaximumtemperaturecapabilityofmaterialsforcreep-baseddesignofpressureequipmentEngineeringSolutionWithhelpofANSYStechnicalteammembers,ISGECHitachiZosenengineersusedtheuserprogrammablefeature(UPF)inANSYSMAPDLtoimplementaCodeCase2605creepmodel.
BycombiningusercreepwithstandardplasticitymaterialmodelsalreadyavailableinANSYSsolu-tions,theysucceededincalculatingtheoverallcreepstrainandcreepdamageundercyclicload-ingconditionsattemperaturesupto454°C.
BenetsAfterimplementingthecreepsubroutineforcalculationofcreepdamageandcreepstrainsforchrome-molysteels,ISGECHitachiZosenengi-neerswereabletoOptimizetheequipmentweightbymaximizingthematerialcapacityathightemperatures,whileensuringthatanycreepdamagewaswithintheacceptablecodelimitDrasticallyreducethetimerequiredforcalculationandpost-processingofcreepstrainandcreepdamageresultsusingaseam-lessniteelementanalysisprocessNullifychancesofhumanerrorcommoninmanualspreadsheetcalculations,whichinvolvemanyassumptionsandoftenover-esti-matecreepdamageISGECHitachiZosenLimitedisthemarket-lead-ingmanufacturerofcomplexpressurevesselsandheatexchangerequipmentforcustomersallovertheworld.
Weprovidesolutionsforavarietyofindustrysegmentsinwhichwearethemanu-facturingleaders.
Wealsohelpinreducingthescale-uprisksfromlabtotheplant.
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CreepdamagecontourplotafterimplementingtheANSYSsubroutineCreepstraincontourplotafterimplementingtheANSYSsubroutine