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Title: Measurement Of Ethane-Rich Streams
Author: Robert E. Vickrey
Source: 1981 International School of Hydrocarbon Measurement
Year Published: 1981
Abstract: Ethane-rich streams are more difficult to measure than the heavier hydrocarbon streams because of solution mixing, high vapor pressure, intermolecular attraction, liquid compressibility and poor lubricating qualities. As the price of ethane for petrochemical feedstock increased above its value as a fuel in natural gas, cryogenic gas processing plants increased the percentage of ethane extracted from natural gas. The value of products contained in a typical demethanized stream is about SOi per gallon in todays market, A certain plant in West Texas delivers about twenty million gallons of demethanized product to pipelines each month. An error or bias of only 0.2% in a densitometer or in a meter factor will cause an error value of nearly 24,000 per month at this plant. This amount of money for such a small error justifies careful attention to assure accurate measurement.

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