AGA Report NoWord文档格式.docx

AGA Report NoWord文档格式.docx

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DETAILandGROSSEquationsofState

Preparedby

AGATransmissionMeasurementCommittee

AGA8,Part1/API14.2.1

ThirdEdition,2017

Copyright©

2017AmericanGasAssociation

AllRightsReserved

DISCLAIMERSANDCOPYRIGHT

TobeaddedlaterbyAGA

1992,1994,2003,and2016AmericanGasAssociation,AllRightsReserved.

11

PREFACE

ThisAGAReportNo.8,Part1,providesallofthetechnicalinformationnecessarytocomputethermodynamicpropertiesincludingcompressibilityfactors,densities,andspeedsofsoundfornaturalgasandrelatedgases.Historicaldocumentationlinkingtheseequationsandcalculationstopriormethodsareincluded.Thedocumentalsoprovidesanalysesofcalculationuncertaintiesforvariousgascompositions.ItisbasedonresearchmanagedandsponsoredbytheGasResearchInstitute（GRI）andtheGroupeEuropeendeRecherchesGazieres（GERG）incooperationwithAGA.Itsupersedesthe1985,1992,and1994editionsofAGAReportNumber8,andgivesidenticalresultstotheInternationalStandardsOrganizationDocumentISO12213,NaturalGas-CalculationofCompressionFactors.Nochangesweremadetotheparametersusedtocalculatethecompressibilityfactor;

therefore,nochangeisrequiredfromthe1994editiontomaintainthestatedaccuracywhenaparticulargasfallswithinthenewuncertaintystatementslistedherein.

Thedocumentationofprogramsforcalculatingpropertiesfromtheequationsofstatedescribedinthisworkhasbeenmovedtosupplementarymaterialforthisstandard.Newexampleprograms,availableinthesupplementarymaterial,areavailableinFortran,VB,andC++.ThesupplementarymaterialalsocontainsaMicrosoftExcelspreadsheettocalculateproperties.Afilecontainingcalculatedpointsisincludedthatcanbeusedtoverifythatanyimplementationproducesvaluesthatareinagreementwiththisstandard.Manypointsaregivenatdifferentcompositions（notnecessarilyrelatedtotypicalnaturalgases）totestthatthecoefficientsandparametersforeachcomponenthavebeenappliedcorrectly.

TheAGA-10publicationonthecalculationofthespeedofsoundhasbeendiscontinuedwiththereleaseofthisrevisionofAGA-8.Thecalculationofallthermodynamicpropertiesisfullydocumentedhere.ThecalculationsdescribedinthisworknolongerrequireintegrationofthecompressibilityfactorequationasdoneinAGA-10,butisimplementedthroughdifferentiationofthefundamentalHelmholtzenergyequationofstate.Thisresultsinfastercalculationsthroughdirectcomputationoftherequiredderivatives.

Implementationdecisionsarelefttotheuser;

however,thecalculationmethodchosenfordensityandcompressibilityfactorscanbereinforcedbytheuncertaintystatementsandexamplecalculationscontainedherein.Adoptionofthesenewguidelinesandequationsisencouragedforallgasmeasurementapplications.

Thisrevisededition,nowdesignatedasAGAReportNo.8,Part1,usesthesameDETAILandGROSSequationsofstateasinthe1994editionofAGAReportNo.8.ThecalculationmethodsforGROSSandDETAILhavenotchangedinthispart.However,thetemperature,pressure,andcompositionlimitsfordifferentlevelsofuncertaintieshavebeenmodified.

TheExcelspreadsheetthatisprovidedinthesupplementarymaterialcanbeusedtodetermineifauser,sapplicableinputs-temperature,pressure,andcomposition-arestillwithinthedesireduncertaintylimiteventhoughoneormoreoftheseinputsmaybeoutsidetherangesgiveninthereport.

ThenewPart2,basedontheGERG-2008equationofstate,isapplicableoutsidethetemperature,pressure,andcompositionrangesofPart1,withuncertaintieswithin0.1%.TheGERG-2008equationcanalsobeusedforoperatingconditionsandcompositionsthatareapplicableforPart1,withdifferencesinthecalculatedvaluesthatarewithintheuncertaintylimitsofeachequation.

Thisdocumentdoesnotrequireupgradingexistingcodeforthecalculationsofpropertiesifthestateconditionsfallwithintheregionsof0.1%uncertaintylistedinthisdocument.Thedecisiontoupgradeexistingcodeshallbeatthediscretionofthepartiesinvolved.

Theuserisencouragedtousethecalculationtoolsprovidedwiththiseditionofthedocumenttodeterminetheimpacttotheirownoperation,andisadvisedtoreviewthechangesandtakeappropriatemeasuresforcalculationofproperties.Iftheapplicabletemperature,pressure,andcompositionarewithintheuser,sacceptablelevelsofuncertainties,theusermaycontinuetousethecurrentsoftwarebasedonthe1994editionofAGA8.

Ill

ACKNOWLEDGEMENTS

IV

TABLEOFCONTENTS

DISCLAIMERSANDCOPYRIGHT ii

ACKNOWLEDGEMENTS iv

1INTRODUCTION 1

1.1Scope 1

1.2Background 1

1.3Overviewof