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Title: Ethylene Measurement
Author: Edgar E. Buxton
Source: 1993 International School of Hydrocarbon Measurement
Year Published: 1993
Abstract: Ethylene has a critical temperature of 48.58F. This fact causes ethylene to behave very differently at ambient temperatures in the general range of 0F to 100F as compared with methane which has a critical temperature of -il6F or n-octane which has a critical temperature of 564.1F. Very large density changes of the ethylene fluid resulting from small changes in temperature or pressure are of the greatest concern with respect to the accuracy of ethylene flow measurements. These very large density changes occur at pressures above 400 psia for the 0F to 100*F temperature range where ethylene may be in either a liquid or vapor (gas) phase depending upon the pressure and energy content. Above the critical pressure (729.8 psia) a liquid phase does not exist, ethylene is in a dense vapor phase and the density values or the density changes are considerably different than those predicted by the gas law equations unless accurate compressibility factors are included.

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