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In API 6A-21st Edition Clause No.

In API 6A-21st Edition Clause No.

In API 6A-21st Edition Clause No.

Adjustable chokes shall be equipped with a visible orifice-area-indicating mechanism to define the orifice
area at any adjusted choke setting throughout its operating range. This mechanism shall be calibrated to
indicate diameters of circular orifices having areas equivalent to the minimum flow areas at any adjustable
choke setting.

Question-: How it will be calibrated e.g. if we are using 128/64 orifice area. Any Sample of calibration report will add extra advantage to me.

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