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Title: New Developments In The Determination Of Compressibility And Supercompressibility: Speed Of Sound In Methane For Development Of Improved Metering Methods Of Natural Gases
Author: A. Sivaraman, B.E. Gammon
Source: American Gas Association 1986
Year Published: 1986
Abstract: New experimental measurements for the speed of sound in methane are described for temperatures from 193.05 to 425.15 K and for densities from 1 to 14.5 mol/dm or to pressures as high as 275 bar. The experimental method is described, and the use of the results for the development of improved metering methods of natural gases is discussed. Merits of and problems with existing equations of state used in metering and custody transfer are discussed. The use of speed of sound data for reducing errors arising from equation of state calculations are suggested. The most severe problems arise at temperatures within 50 K of the critical temperature and at densities within a range 50 percent higher or lower than the critical density. Problems also arise for fluids at very high pressure or high densities. Over the region of interest for orifice flow metering of pipeline gases, available equations of state accurately predict values of the speed of sound.

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