Answer / carl_ellis

An orifice plate (OP) creates a pressure drop in the flow
stream.

The question is whether an orifice plate 'works'. Works how?

An orifice plate will always 'work' by creating a pressure
drop; the proper questions are whether the permanent
pressure loss is excessive, whether the orifice plate has
been 'sized' for a specific medium at correct design
conditions, and whether the pressure drop (DP) is adequate
for instrumentation that senses the DP.

Orifice plates typically drop 100 inches water column at
100% flow rate, about 25 times the DP of 100mm water column.
A DP of 100mm water column at 100% flow rate is more
typical of an averaging pitot tube than an orifice plate. A
full scale flow rate of 100mm w.c. requires a low range
pressure transmitter, or one with a high turndown ratio.

A 0.3 Beta is acceptable.

Carl Ellis
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