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It can be estimated for popular choke types or tabulated in laboratory.
The most popular engineering correlation covering all ISO 5167 tapping arrangements is given by Stolz:
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C_d = \frac{d_D}{d} + 0.3167 \cdot \left( \frac{d}{d_D} \right)^{0.6} + 0.025 \cdot \big [ \log {\rm Re} - 4 \big ] |
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Pipeline Engineering / Pipeline / Choke
Reference
Stolz,J.,"A Universal Equation for the Calculation of Discharge Coefficient of Orifice Plates";, Proc. Flomeko 1918- FlowM easurement of Fluids,H. H. Dijstelbergenand E. A.Spencer(Eds), North-HollandPublishingCo.,Amsterdam(1918).pp 519-534