Gas velocity under sonic flow conditions (through choke)

Input(s)

$K_{s}$: Empirical Gas Constant $(\mathrm{ft} / \mathrm{s})$

$\rho_{l}$: Liquid Density $(\mathrm{g} / \mathrm{cc})$

$\rho_{g}$: Gas Density $(\mathrm{g} / \mathrm{cc})$

Output(s)

v: Allowable Gas Velocity (ft/s)

Formula(s)

$$ v=K_{s} *\left(\frac{\rho_{l}-\rho_{g}}{\rho_{g}}\right)^{0.5} $$

Reference(s)

John M. Campbell, 1992. Gas Conditioning and Processing, Campbell Petroleum Series, Oklahoma, Vol. 2, Page: 73.