the square root of the differential pressure across the orifice's pressure tappings and applying an appropriate constant.

Orifice plates are also used to reduce pressure or restrict flow, in which case they are often called restriction plates.

Pressure tappings

There are three standard positions for pressure tappings (also called taps), commonly named as follows:
* placed immediately upstream and downstream of the plate; convenient when the plate is provided with an orifice carrier

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