ASME BPVC Pressure Vessel Consul1ng Services 2019 ASME ... · Stresses were classiﬁed according...

ASMEBPVCPressureVesselConsul1ngServicesASMESec1onVIII,Division2StressandFa1gueAnalysis

1|172019

www.Predic1veEngineering.com

Overthelast20+years,Predic1veEngineeringhastackledsomeofthemostcomplexapplica1onsoftheASMEBPVCSec1onVIII,Division2“Design-by-Analysis”specifica1ons.

•  Stressandfa1gueanalysisoflarge-diameternuclearwasterecyclingvesselsunderNQA-1requirements•  Vesselswithinternalpipingandstructuressubjectedtosloshing,seismicandadded-masseffects•  Transientthermal-fa1gueofthick-walledtanks•  LiZingandtransporta1onanalyses•  BucklinganalysisviaASMEformulas,EulerianandNonlinearmethods•  Differen1althermal-stressanalysisofheatexchangeshavingmixedmaterials

Withinthisbodyofpressurevesselconsul1ngwork,wehaveappliedthefollowingcodes:•  ASMEBPVCSec1onVIII,Division2stressandfa1gue•  ASCE4-98withadded-massapplica1onsfornormalmodesanalysis•  ASCE7-02,AISIN690andABS

Totakeourengineeringworktothenextlevel,ourpressurevesselconsultantshavewri`encustomsoZwareforstressandfa1gueevalua1onofthinandthick-walledpressurevesselsandwhenneededbeenabletoperformop1miza1onstudiesonvesselsviaExcelspreadsheetviaourFEAsoZware’sapplica1onprograminginterface.

Insummary,ourcarefulandme1culousanalysisworkhasallowedustoclassifytanksandvesselsas“fit-for-service”thatwouldtypicallyhaverequiredextensivereworkbyhand-calcula1ons.Clientscometouswhentheyneedhigh-qualityworkexecutedanddocumentedtowithstandthemostrigorousreviewswhetherDOE,Bechtel,GEWaterandGasorSpaceX.


2|172019


Alargediameterspray-dryingchamberwasanalyzedforseismic,windandliZing.ApplicablecodeswereASCE7-02withreferencetotheUBCandANSIA58.1.TheliZingstressrequirementswereborrowedfromASME,Sec1onVIII,Division2.Themodelwashighlyidealizedandallowedsec1onstobeop1mizedforseismicandliZing.


3|172019


Thick-wall,high-pressureliquidoxygen(LOX)tanksexperiencethermalfa1guecondi1onsnotrarelyseeninnormalpressurevessels.Stressclassifica1onrequiredourcompleteASMEsoZwarearsenal.MembranestresseswerecalculatedusingstandardASMEstresslineariza1on.


4|172019


Seismic,thermal,deadweight,nozzleandpressureanalyseswereperformedonaseriesoflarge-scale(e.g.,300”diameter)nuclearwasteprocessingvesselsfortheDOE.EngineeringworkwasapprovedunderASMESec1onVIII,Div.2,ASCE4-98forSeismicAnalysisofNuclear-RelatedEquipmentandassociatedNQA-1requirements.


5|172019


A100foot-longtubeandshellevaporatorwasanalyzedforstressanddeflec1onbasedonjointlydevelopedtransporta1onloads.StresseswereclassifiedaccordingtoASMESec1onVIII,Div.2.Theevaporatorwasfabricatedwithseveraldifferentmaterialtypes,eachwithdifferentASMEDivision1materialallowables.ThevesselwasconstrainedwithasaddlesupportnearthetoptubesheetwithaSchnabelconnec1onatthebaseoftheskirt.


6|172019


Off-ShoreProcessingPlalorm:SloshingAnalysis

ThesloshingloadsforthisvesselwerecalculatedperASCE4-98,SeismicAnalysisofSafety-RelatedStructures.Fromthesecalcula1ons,threeloadingcondi1onswerederived:HorizontalImpulsiveMode,HorizontalSloshing(Convec1veMode)andVer1calFluidResponseMode(Breathing).Handcalcula1onsweredonealongwithSmoothPar1cleHydrodynamics(SPH)tosimulatethesloshingevent.Analy1calandnumericalresultscorrelatedandthevesselwasclassified“fit-for-service”.


7|172019


Thermal-StressFa1gueAnalysisofBoiler

AnASMEthermalfa1gueanalysiswasperformedonahigh-temperaturefluegassteamgenerator(i.e.,boiler).Giventhelargethermalgradientsbetweenthefluegasinletandoutlet,thethicktubesheetpresentedapar1cularthermal-stresschallenge.Thevesselpassedbasedonpeakalterna1ngstress(Sa)perFigure5.110.2.1.


8|172019


Some1mesourbestworkistoop1mizeadesignintosomethingcompact,efficientandrobust.TheabovemodelrepresentsauniquetypeofASMEpressurevesselthatmustwithstandhighpressureswhilesimultaneouslyhavingalargesurfaceareaforheattransferrequirements.


9|172019


High-pressuremanifoldcas1ngsarenotuncommoninmarineandchemicalprocessingapplica1ons.Usually,itisenoughtoperformastandardhydrosta1ctest(UCD-99)attwicethemaximumallowablepressurebutinthiscase,ourclient’sclient(USGovernment)requestedthattheirhigh-pressurehydraulicmanifoldcas1ngsalsomeetASMEDesign-by-Analysisspecifica1onsincludingprotec1onagainstplas1ccollapse.StandardASMESec1onVIII,Division2rulescanbemetwithlinearsta1canalysisbutplas1ccollapseassumesthatthecas1ngmustholdtogetherunder2.4xthedesignload.ThislastrequirementwasmetbyperformingacompletenonlinearstressanalysisusingLS-DYNA.


10|172019


Shownaboveisatubeandshellheatexchangercoupledtopipingsystem.Thesystemismountedonastructuresteelframe(notshown).Thermalandstressanalysiscalcula1onswereperformedperASMEVIII,Div.2todeterminethermalandstressmargins.Someop1miza1onworkwasdoneonthelowerpipingsystemduetowindloadingeffectsperASCE7-02.


11|172019


Shellandtubeheatexchangerforaboilingtube,dual-vesselevapora1vesystem.Themainshellwas1taniumwiththetubingofSA-240.DesignandanalysisworkperformedfortheDedertCorpora1on.


12|172019


ShellandtubeheatexchangerperASMESec1onVIII,Div.2analyzedfordesign,opera1ng,bucklingandseismicloading.Thefinaldesignofthevesselrequired14designitera1onsduetointernalbaffleconstraintstopreventbuckling.Thefinalbucklinganalysiswasdonebygeometric,nonlinearanalysistoconfirmsafetymargins.


13|172019


Formaldehydereactoranalyzedforthermalandmechanicalperformance.ASMESec1onVIII,Div.2coderequirementsoninternalshellandtubeheatexchanger.


14|172019


VerylargeASMEvesselanalyzedfortube-sheetstressesarisingfromdual-materialtube-bundlewithlikewisedualmaterialshell.Thermal-stressanalysiswasperformedtoclassifysystemunderASMEstressandfa1guerequirements.


15|172019


AcomplexliZinganalysiswasperformedtoverifythatanalreadybuiltvesselsystemwouldnotexceedASMESec1onVIII,Div.1allowables.Theslingsandspreaderbarwereidealizedwithbeamelementsandpinnedconnec1ons.


16|172019


ShownaboveisaFEAmodelofaneightpassenger,deep-diving(depth1,200’)luxurysubmarine.Stressresultswereverifiedbystraingaugingofthesubmarineduringitssubmersibleproof-test.Giventheclosecorrela1onofthestressresultstothedivetest,itbecomethefirsthumanoccupancysubmersiblecer1fiedbytheAmericanBureauofShipping(ABS)viathefiniteelementmethod.


17|172019


AboutPredic-veEngineering

o BasedinPortland,Oregono 20+yearsexperiencewithFEMAP,NX

NastranandLS-DYNA.o Focusedonsimula1onofcomplexstructur

es andsystemswheretherightanswerisfundamental.

o Referencescanbeobtainedatourwebsite:www.PredictiveEngineering.com

https://www.predictiveengineering.com

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ASME BPVC Pressure Vessel Consul1ng Services 2019 ASME ... · Stresses were classiﬁed according...

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