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Title: Ethylene Measurement
Author: H. A. Brainerd
Source: 1985 International School of Hydrocarbon Measurement
Year Published: 1985
Abstract: Accurate custody transfer of ethylene through pipelines has become increasingly important since it began in the mid-1960s because - 1. The volumes transported have increased dramatically to approximately 30 billion pounds per year. 2. The cost of ethylene has increased more than 10-fold from 2 per lb. to more than 20? per lb. Unfortunately, it is very difficult to measure ethylene with extreme accuracy because at the normal custody transfer operating pressures and temperatures, ethylene has a high degree of compressibility. With a critical temperature of 49F. and a critical pressure of 730 psi, the high compressibility varies considerably for different operating conditions normally experienced in ethylene custody transfer systems. Using the same instrumentation found in liquid pipelines, the measurement error will generally be many times greater than experienced in liquid pipelines.

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