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Module3API530
ObjectivesDescribeAPI530calculationsIntroduceuser-definedmaterialscapabilityDemonstratetubedesigncalculation(Example2)Demonstratetubelifecalculation
(Example3)AnalyzeAPI530reports
API530APIstandardfordesigningradianttubesinprocessfiredheatersMostcommonlyusedstandard4thedition,October1996APIRP579FitnessforserviceMorecomplexmethod
API530APIRP579NoconsensusonwhetherRP579methodisbetterAPI560FiredHeatersforGeneralRefineryServices
API530CalculationsMinimumrequiredtubewallthicknessBasedontubegeometry,metallurgy,andoperatingconditionsProcessheattransfercoefficientMaximumtubemetaltemperatureExpectedtubelifeBasedonoperatingconditionsovertimePastandfuturemodes
API530Calculations Equationsinthissectionaretakenfrom APIStandard530–CalculationofHeater-TubeThicknessinPetroleumRefineries,
4thed.,AmericanPetroleumInstitute,Washington,D.C.(October1996).
TubeWallThicknessElasticdesignFailurebyburstingwhenpressureisatitsmaximumnearendofdesignlifeTypicallyatlowertemperaturesRupturedesignFailurebycreepruptureduringdesignlifeTypicallyathighertemperaturesXfhchecksbothdesigns
ElasticAllowableStress
ElasticDesignCA = CorrosionallowanceDo = OutsidediameterPe = ElasticdesignpressureSe = Elasticallowablestressts = Stressthicknesstm = Minimumthickness
RuptureAllowableStress
RuptureDesignCA = CorrosionallowanceDo = Outsidediameterf = CorrosionfractionPr = RupturedesignpressureSr = Ruptureallowablestressts = Stressthicknesstm = Minimumthickness
RuptureDesignAccumulationofdamagefunctionofcurrentoperatingtemperatureDesignbasedonmaximumoperatingtemperaturetooconservativeAPI530equivalentmetaltemperatureSamedamageaccumulationaslineartemperatureprofilebetweenstartandendofruntemperatures
MetalTemperatureTbTmProcessfluidCokelayerTubewallHeatflux
MetalTemperatureDo = OutsidediameterDi
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