Measuring and testing – Specific gravity or density of liquid or solid
Reexamination Certificate
2000-08-29
2003-10-21
Williams, Hezron (Department: 2856)
Measuring and testing
Specific gravity or density of liquid or solid
C073S597000, C073S602000
Reexamination Certificate
active
06634214
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method of measuring the relative density value of a gas.
Relative density is a dimensionless number.
The gas may be a fuel gas, for example natural gas. The natural gas may be methane and may further comprise nitrogen and/or carbon dioxide. In addition to methane the natural gas may comprise at least one other hydrocarbon gas, for example ethane, propane, butane, pentane or hexane.
SUMMARY OF THE INVENTION
According to a first aspect of the invention a method of measuring the relative density of a gas comprises making a measure of the speed of sound in the gas, making a measure of a first thermal conductivity of the gas at a first temperature, making a measure of a second thermal conductivity of the gas at a second temperature which differs from the first temperature, and using the speed of sound and the first and second thermal conductivities in an operation producing the relative density of the gas corresponding to said speed of sound and said first and second thermal conductivities.
According to a further aspect of the invention an apparatus for measuring the relative density of a gas comprises means for making a measure of the speed of sound in the gas, means for making a measure of a first thermal conductivity of the gas at a first temperature, means for making a measure of a second thermal conductivity of the gas at a second temperature which differs from the first temperature, and means for using the speed of sound and the first and second thermal conductivities in an operation producing the relative density of the gas corresponding to said speed of sound and said first and second thermal conductivities
REFERENCES:
patent: 4246773 (1981-01-01), Haruta
patent: 4938066 (1990-07-01), Dorr
patent: 5159843 (1992-11-01), Shakkottai et al.
patent: 5247826 (1993-09-01), Frola et al.
patent: 5307668 (1994-05-01), Vander Heyden
patent: 5461931 (1995-10-01), Gill
patent: 5564306 (1996-10-01), Miller
patent: 5697346 (1997-12-01), Beck
patent: 5869745 (1999-02-01), Schroeder et al.
patent: 6032535 (2000-03-01), Fischer et al.
patent: 6047589 (2000-04-01), Hammond et al.
patent: 6073491 (2000-06-01), Fischer et al.
patent: 6286360 (2001-09-01), Drzewiecki
patent: 6442996 (2002-09-01), Thurston et al.
patent: 6487916 (2002-12-01), Gomm et al.
patent: 2 312 508 (1997-10-01), None
Hammond Paul Stephen
Price Barry Leonard
Thurston Robert Richard
BG Intellectual Property Limited
Saint-Surin Jacques
Williams Hezron
LandOfFree
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