Natural Gas Processing

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8.7. Calculating C_v for gases

Because of compressibility, gases and vapors expand as the pressure drops at the vena contracta, decreasing their specific weight. To account for the change in specific weight, an expansion factor, Y, is introduced into the valve sizing formula. The form of the equation used is one of the following, depending on the process variables available.

$w = 63.3 F_{P} C_{v} Y \sqrt{x P_{1} γ_{1}}$

(8.12)

$Q = 1360 F_{P} C_{v} P_{1} Y \sqrt{\frac{x}{G_{g} T_{1} Z}}$

(8.13)

$w = 19.3 F_{P} C_{v} P_{1} Y \sqrt{\frac{x MW}{T_{1} Z}}$

(8.14)

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8.7. Calculating Cv for gases

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8.7. Calculating C_v for gases