DAK Equation of State

Version 1.7.0.0 (2.23 KB) by Chigozie Aniemena
Tabular and graphical implementation of the Dranchuk-Abbou Kassem equation of state
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Updated 22 Apr 2013

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Calculates the compressibility factor of natural gases for range of pressures 'minP' to 'maxP' in steps 'Pstep'(for a given temperature T and specific gravity sg) using the Dranchuk-Abbou Kassem equation of state. The input pressures and temperature are in Psia and degree Farenheit respectively. Average absolute error of 0.486% for 0.2<Ppr<30 and 1.0<Tpr<3.0 and for Ppr<1.0 with 0.7<Tpr<1.0. Poor results for Tpr = 1.0 and Ppr>1.0(Craft&Hawkins,1991)

Cite As

Chigozie Aniemena (2026). DAK Equation of State (https://www.mathworks.com/matlabcentral/fileexchange/37396-dak-equation-of-state), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2010a
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
1.7.0.0

Improved bisection algorithm to ensure high pressure values are properly handled
1.6.0.0

General in-code commentary
1.5.0.0

Updated commentary on range of validity
1.3.0.0

Restates that the input temperature is in degree Farenheit and not degree Rankine as previously stated. Code structure remains unchanged.
1.2.0.0

Update of Sutton's Correlation
1.0.0.0