Requirement of vent/drain hole on Orifice plates for multi-phase (gas & liquid) d/p flow measurement.

R

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raymond

Could I get some advice on using d/p flow measurement on the subject above.

For multi-phase fluid meas. (gas & liquid, mixed, combined, etc.), how do we apply or justify the need of the vent or drain hole? which is required or is there a need for both, in such multi-phase case?

Thank you.
 
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