How to calculate the outlet flow rate of a centrifugal pump
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How to calculate the actual flow rate of a centrifugal pump when there is no flow meter at the pump outlet
Based on the pump’s performance curve, the head is calculated using the pressure difference between the inlet and outlet, and the corresponding flow rate is found on the flow-rate vs. head curve
This post was last edited by qq_ 〆Flowing Years Are Also Dreams╮82282 on 2019-3-4 at 08:43. A clumsy method: when the flow rate of the metering pump is not high, use a measuring cup to collect the liquid; while doing so, use a stopwatch to measure the time taken. Measure up to the scale lines on the measuring cup, calculate based on time, or round it to the nearest whole minute and weigh it to do the calculation as well.
It’s a bit difficult to conduct such measurements on our 5,000-cubic-foot pump
By looking at the curve, if the power curve is steep, the power can be calculated using current; whereas if the power curve is flat, the head can be estimated using the pressure difference between the inlet and outlet