AGA XQ0901:2009
AGA XQ0901:2009 Aga Report No. 5, Natural Gas Energy Measurement Presents methods of calculating heating values of natural gas with different compositions.
Table of Contents
DISCLAIMERANDCOPYRIGHTACKNOWLEDGEMENTS
FOREWORD
TABLEOFCONTENTS
1SCOPEOFAPPLICATION
1.1General
1.2RangeOfApplication
1.2.1InclusionCriteriaforFuelGasMixtures
1.3RangeofGasMixtureConstituents
1.3.1ConcentrationofGasConstituents
1.3.2DirectlySupportedConstituents
1.3.3OtherConstituents
1.3.4GroupedConstituents
1.4OtherComposition-DependentGasProperties
1.5RangeofContractBasePressuresandContractBase
Temperatures
1.6CompoundsintheLiquidState
2DEFINITIONSANDBACKGROUND
2.1BritishThermalUnit(Btu)
2.2Calorie
2.3Combustion
2.4CombustionReferenceTemperature
2.5ContractBaseConditions
2.6Dekatherm
2.7DryGas
2.8HigherHeatingValue(HHV),alsoknownasGrossHeating
Value(GHV)
2.9IdealGas
2.10MotorOctaneNumber(MON)
2.11MethaneNumber(MN)
2.12NaturalGasEnergyMeasurement
2.13LowerHeatingValue(LHV),alsoknownasNetHeating
Value(NHV)
2.14RealGas
2.15RelativeDensityandSpecificGravity
2.16SensibleHeat
2.17Therm
2.18WaterDewPoint
2.19Water-SaturatedandPartiallyWater-SaturatedGases
2.20WobbeNumber(WN),alsoknownasWobbeIndex(WI)
3BASISFORCUSTODYTRANSFER
3.1SpecificationofEnergy
3.2SpecificationofHeatingValue
3.3Higher(Gross)VersusLower(Net)HeatingValue
3.4DryVersusSaturatedHeatingValue
3.5EnergyDerivedfromVolumetricMeasurements
3.6EnergyDerivedfromMassMeasurements
3.7SamplingandOff-lineAnalysis
3.8CompressibilityFactor
3.9Enthalpy
3.10AccountingforthePresenceofWater
4UNCERTAINTY
4.1AcceptanceCriteria
5HEATINGVALUEDETERMINATIONMETHODS
5.1HeatingValuefromGasComposition
5.1.1GeneralRequirements
5.1.2GasChromatography
5.1.3MassSpectrometry
5.2HeatingValueMeasurement
5.2.1GeneralRequirements
5.2.2Calorimeter
5.2.3Fuel/AirTitration
5.3HeatingValuefromInferential(Correlative)Methods
6REFERENCES
APPENDIXA
Pre-CalculatedTablesofIdealGasGrossHeatingValue
(VolumetricBasis)
Pre-CalculatedTablesofIdealGasGrossHeatingValue
(MassBasis)
ExampleCalculationofVolumetricHeatingValue(Imperialunits)
ExampleCalculationofVolumetricHeatingValue(SIUnits)
StandardEnthalpiesofFormation
StoichiometricCoefficients
BalancedCombustionReactionEquationsforCommonHydrocarbons
IdealGasMolarHeatingValuesat298.15K
EnthalpyofVaporizationofWater
EnthalpyAdjustment
EquationConstantsfortheIdealGasHeatCapacityCorrelation
CalculationofSummationsFactors
EquationConstantsfor2ndVirialCoefficients
SummationFactorsatCommonReferenceTemperatures
MolarMasses
TableofH/C(HydrogentoCarbon)Ratios
ExampleProcessforSupportingAdditionalCompounds
CalculatingNaturalGasRelativeDensityandthe
CompressibilityofAir
EstimationofWaterContentfromDewPointMeasurements
DewPointTemperatureVersusWaterContentinNaturalGas
APPENDIXB
FORMFORPROPOSALSONAGAREPORTNO.5,MARCH2009