GRI high-accuracy natural gas equation of state for gas-measurement applications. Annual report, May 1990-April 1991. 1991 revision of AGA No. 8 equation. Technical reference document
A new equation of state has been developed for essentially dry and sweet (i.e., less than one mole percent water or hydrogen sulfide) natural gases. The equation is based on approximately 15,500 PVT data points provided by the GERG (Groupe Europeen de Recherches Gazieres) and a correlation methodology in part provided by researchers from the University of Idaho. The correlation is accurate to about 0.02 percent in the compressibility factor for pure methane in a temperature range from 222 to 355 K (-60 to 180 F) and pressures up to 30 MPa (4350 psia). For 84 natural gases with compositions ranging up to 54 percent nitrogen, 29 percent carbon dioxide, 10 percent ethane and 4 percent propane, the correlation prediction of the compressibility factor is within 0.03 percent on the average from the experimental data. Based on these and other data comparisons, it is estimated that predicted compressibility factors should be on the average within 0.1 percent of the 'true' value for natural gases with up to 50 percent nitrogen, 50 percent carbon dioxide, 20 percent ethane, and 5 percent propane in a temperature range from 222 to 355 K (-60 to 180 F) at pressures up to 30 MPa (4350 psia). The correlation can be used for calculations in a temperature range between 145 and 475 K (-200 and 400 F) and pressures to 135 MPa (20,000 psia) but with decreased accuracy. Natural gas speed of sound predictions are shown to be generally accurate to within 0.1% of experimental data on the average at reasonable operating conditions for sonic nozzles.
- Research Organization:
- Oklahoma Univ., Norman, OK (United States). School of Chemical Engineering and Materials Science
- OSTI ID:
- 5990192
- Report Number(s):
- PB-92-116227/XAB; CNN: GRI-5089-260-1886
- Resource Relation:
- Other Information: See also PB85-188316. Prepared in cooperation with Idaho Univ., Moscow. Dept. of Mechanical Engineering. Sponsored by Gas Research Inst., Chicago, IL
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NATURAL GAS
EQUATIONS OF STATE
ACCURACY
CARBON DIOXIDE
COMPRESSIBILITY
ETHANE
HYDROGEN SULFIDES
MEDIUM PRESSURE
METHANE
MIXTURES
MOISTURE
NITROGEN
PROPANE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
VOLUME
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
ELEMENTS
ENERGY SOURCES
EQUATIONS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
MECHANICAL PROPERTIES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE RANGE
033000* - Natural Gas- Properties & Composition