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Title: Light Hydrocarbon Measurement
Author: Ronald E. Beaty
Source: 1988 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1988
Abstract: Traditional volumetric measurement has proven ineffective for mixed natural gas liquid streams containing significant percentages of ethane. Measurement errors of more than seven percent can be experienced using API or other generally accepted tables to correct volumes of natural gas liquids containing 50% ethane and 50% heavier components. This is due to the effect of nonideal mixing, compressibility, and Intermolecular adhesion of the various hydrocarbon molecules. Settlements are normally made for product volumes at 60F and equilibrium vapor pressure. Traditional volumetric measurement requires definition of the physical properties of the hydrocarbon product in order to accurately determine the appropriate correction factors to adjust the volume for deviations in temperature and pressure from 60F and equilibrium vapor pressure. Volumetric correction tables for temperature and pressure can be developed for specific mixtures of hydrocarbons as their physical behavior is predictable. When ethane is mixed with other hydrocarbons, volumetric correction can be accomplished accurately if the component composition changes only within a very limited range.

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