The American School of Gas Measurement Technology (ASGMT) has been at the forefront of Flow Measurement training since its inception in 1966. Over the years, ASGMT has evolved to encompass comprehensive training in both gas and liquids measurement. With a commitment to excellence, ASGMT now offers an extensive curriculum comprising over 115 lecture classes, complemented by 48 Hands-On Product Training sessions led by industry experts.


September 16th – 19th, 2024

Overview of Equations of State (EOS)

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March 16, 2016

Determination of fluid properties and phase conditions of hydrocarbon mixtures is critical for accurate hydrocarbon measurement, representative sampling, and overall pipeline operation. Fluid properties such as compressibility and density are critical for flow measurement, and determination of the hydrocarbon due point is important to verify that heavier hydrocarbons will not condense out of a gas mixture in changing process conditions.

In the oil and gas industry, equations of state (EOS) are typically used to determine the properties and the phase conditions of hydrocarbon mixtures. EOS are mathematical correlations that relate properties of hydrocarbons to pressure, temperature, and fluid composition. Various software packages are available that use different EOS to calculate a range of natural gas properties and phase conditions. This paper discusses the different EOS that are available, the properties that can be obtained from each EOS, and practical uses of EOS software for natural gas pipeline applications.

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