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Can DP transmitter with orifice plate works on Beta ratio
0f 0.3 and differential pressure of 100 MMWC in liquid
service application?
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Answer Posted / 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
Measure First
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