| Author | Message |
Bluerose
386 posts |
#174496 2008-05-14 07:20 GMT |
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I have three (3) water pumps. They each are the same Watts, the same Volts, the same Amps, and the same Horsepower, yet they each have a "different" GPH (gallons per hour) rating. How is this possible?
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pickapepper
345 posts |
#174497 2008-05-14 07:29 GMT |
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Power = flow (gal/hr) * pressure
Most likely, the pumps are rated for different pressures. They could also be different designs with different efficiencies, but I would be surprised if this was the cause. |
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Sparkle
341 posts |
#174498 2008-05-14 07:30 GMT |
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Volts & Amps , Watt , Horsepower are the consumed power to operate the pumps.
power = developped pressure X Volume rate. Volume rate = Power / Pressure as pressure increase Volume rate decrease for same input power. |
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HotLipps
367 posts |
#174499 2008-05-14 07:48 GMT |
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Watts, Volts, Amps and Horsepower all relate to the motor driving a pump, not the pump itself.
It's quite possible you could have three identical motors coupled to three different pumps. If they are close coupled centrifugal pumps, you could have three different impeller sizes giving different outputs at different pressures. If they are reciprocating pumps they could have different strokes or bores. If they are not close coupled, they could be running at different speeds. |
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LetsRemeber
342 posts |
#174500 2008-05-14 13:41 GMT |
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It depends on the head each develops and the efficiency of the pump.
Pumps capacity and capability is determined on the pump end and not the driver end. You need to compare pumps by looking that their performance curves. Even three identical pumps can have slightly different capability depending on manufacturing tolerances or age. |
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thruthelookingglass
347 posts |
#174501 2008-05-15 12:07 GMT |
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A pump capacity should be expressed as X GPM (or GPH) at Y TDH - Total dynamic head. The same pump will be rated for more flow if the original design only had it pumping against 20-ft of head than if it were designed to overcome 50-ft of head.
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