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# Pitot Tube Flowmeter Calculations

A Pitot tube measuring the flow of glycerin (78.6 lb/ft3 ) produces a differential pressure of 35 inches W.C. at a mass flow rate of 450 pounds per minute.

Calculate the differential pressure produced by this same Pitot tube at a flow rate of 310 lb/min.

Calculate the mass flow rate at a differential pressure of 12.6 ”WC.

If the glycerin density happens to change from 78.6 lb/ft3 to 75.1 lb/ft3 , calculate the mass flow rate at a differential pressure of 24.8 ”WC.

Differential pressure produced by this same Pitot tube at a flow rate of 310 lb/min = 16.61 ”WC

Mass flow rate at a differential pressure of 12.6 ”WC = 270 lb/min

Mass flow rate at DP of 24.8 ”WC, assuming density of 75.1 lb/ft3 = 370.3 lb/min

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