A differential pressure detector is being used with an orifice plate to measure water flow rate through a pipe.
When the flow detector was last calibrated, the following parameters were observed:
Upstream Pressure = 125 psig
Downstream Pressure = 116 psig
Actual Flow Rate = 100 gpm
Indicated Flow Rate = 100 gpm
Significant erosion of the orifice has occurred since the calibration such that actual flow rate through the orifice has increased to 120 gpm while the upstream and downstream pressures have changed to 110 psig and 106 psig respectively.
What is the approximate flow rate that is currently indicated?
A. 44 gpm
B. 67 gpm
C. 81 gpm
D. 120 gpm
Share your understanding of this question with the correct explanation.