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Relates pressure drop $\begin{array}{l}p_{out} - p_{in}\end{array}$ on the choke with the flowrate through the choke $\begin{array}{l}q\end{array}$ arising from fluid friction with choke walls:

(1)	$\begin{array}{l}\displaystyle p_{out} - p_{in} = \frac{\rho}{8.05 \, d^4] \, C_d^2} \cdot q^2\end{array}$

where

$\begin{array}{l}\rho\end{array}$	fluid density
$\begin{array}{l}d\end{array}$	choke orifice diameter
$\begin{array}{l}C_D\end{array}$	discharge coefficient

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Pipeline Choke @model

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