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We have a flow calculation in an APACS function block called PT_COMP, it contains this formula:
[FLOW] := [F_CAL] * ( ([HEAD]/[H_CAL]) * (P/PC) * (TC/T) ) ** 0.5
F_CAL = max flow at max orifice DP
HEAD = DP across orifice
H_CAL = DP transmitter span Inches of water
P = Pressure transmitter PSIA
PC = Pressure transmitter span PSIA
T = Temperature in Deg. Rankine
TC = Temperature transmitter span Deg. Rankine
This calculation gives a "ball park" pressure/temperature compensated flow calculation for an orifice flow meter.
Strangely enough it does come pretty close to the Coriolis meter downstream of it.
My confusion is what does the "** 0.5" signify at the end of the calculation?
Some have told me it denotes Power, and others have said it means square root.
I hope someone more fluent than I can explain this calculation.
Thanks in advance for your help.
[FLOW] := [F_CAL] * ( ([HEAD]/[H_CAL]) * (P/PC) * (TC/T) ) ** 0.5
F_CAL = max flow at max orifice DP
HEAD = DP across orifice
H_CAL = DP transmitter span Inches of water
P = Pressure transmitter PSIA
PC = Pressure transmitter span PSIA
T = Temperature in Deg. Rankine
TC = Temperature transmitter span Deg. Rankine
This calculation gives a "ball park" pressure/temperature compensated flow calculation for an orifice flow meter.
Strangely enough it does come pretty close to the Coriolis meter downstream of it.
My confusion is what does the "** 0.5" signify at the end of the calculation?
Some have told me it denotes Power, and others have said it means square root.
I hope someone more fluent than I can explain this calculation.
Thanks in advance for your help.