气体安全阀计算-Ognition-PSV-sizing-calculation-Spreadshee

GAS/VAPOR&STEAMRELIEFSIZINGCALCULATIONCalculationaccordingAPI-RP-5207thedition,January2000)RELIEFVALVEDATADischargetoFluidSetpressure(Pset)(barg)Vapor-gas/Steamrelief(V/S)Backpressure(P2)(bara)Relievingtemperature(T)(°C)Molweightgas/vapor(M)Accumulatedpress.(P1)(bara)Compressibility(Z)(@reliefcond.)Specificheatratiocp/cv(k)Requiredreliefload(W)(kg/h)RELIEFVALVEORIFICECALCULATIONXOSTEAMAbbr.DescriptionunitCheckforsubcriticalflowonlyincaseofsteamreliefACalculatedorificeareaCheckforsubcriticalflowusingWRequiredmassflowthefollowingformulaCk-valuecoefficientTRelievingtemperatureCalculatedKnwithZCompressibilityfactorMMolweightP1UpstreamrelievingpressureXOSubcriticalflowvapor/gasP2BackpressureF2CoefficientsubcriticalflowkSpecificheatratioCp/CvrPressureratio(P2/P1)KdDischargecoefficientCalculatedCwithCalculatedF2withKbBackPressureCoefficientKcCombinationcorrectionfactorKnNapiercorrectionfactorKshSuperheatcorrectionfactorSTANDARDORIFICEAREAS(acc.API-RP-526)Orificetag--Area(mm²)etcArea(sq.inch)etcCORRECTIONFACTORSCALCULATEDORIFICEDischargecoefficient(Kd)TypeofflowBackpressurecoeff.(Kb)k-valuecoefficient(C)Comb.Rupturediskfactor(Kc)Coefficientsubcriticalflow(F2)Calculatedorifice(mm²)Napiercorrectionfactor(Kn)Recommendedorifice(mm²)Superheatsteamcor.factor(Ksh)OrificeTAG(accAPI-RP-526)VALVEDATAHP-flarePROCESSDATAVapor5.17V1.0075Accumulation(%)10.0051.006.700.901.1124270.0VAPOR/GASmm²kg/hrKkg/kmolebaraCritcalflowvapor/gasbaraDEFGHJKLMN711261983255060,1100,1960,3070,5030,785K-VALUES0.975CALC.DATACritical1.0830118618412323280036971,2871,8382,8353,6004,340APISTD520eightedition,Dec2008,Example1NOTES:-41161.0P3281.0-