In a centrifugal pump casing the flow of water leaving the pump is
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Free vortex motion
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Flow of water will be measured in Liters per Minute, or , Galons a minute. Thus the volume of water that is displaced in a certain period of time. Therefore you will have to calculate the volume between two vanes, multiply that with the revolutions of the impellor, multiplied with the amount of vanes.
Then you have to deduct loses and slip. That is the volume of water that remains in the pump-casing because of back-pressure.
It all makes for difficult calculations but a very close estimate could be made by measuring the volume of water sucked in by the pump in one minute.
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