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Relates pressure drop 

LaTeX Math Inline
bodyp_{out} - p_{in}
 on the choke with the flowrate through the choke
LaTeX Math Inline
bodyq
 arising from fluid friction with choke elements (ISO5167):

LaTeX Math Block
anchordp
alignmentleft
p_{in} - p_{out} =  \frac{ \rho \cdot (1- \beta^4)}{0.125 \, \pi^2 \, d^4 \, C_d^2 \, \epsilon^2} \cdot  q^2

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