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Gas Z-Factor (Brill–Beggs)

Compressibility of a natural gas at pressure — pseudo-criticals from gas gravity, Z by the Brill–Beggs explicit correlation.

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Typical pipeline gas 0.55–0.87.
psia
°F

Result

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Method & assumptions
Standing pseudo-criticals → ppr, Tpr → Z = A + (1−A)e−B + C·pprD (Brill–Beggs)

Brill–Beggs is the explicit fit to the Standing chart — valid for sweet gases (γ 0.55–0.9) in the chart's ppr/Tpr envelope. Sour gases need Wichert–Aziz correction first.

Engineering aid only — verify results against the applicable code edition and the equipment datasheet before committing to a design.

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