One limitation of a centrifugal pump is that the suction height cannot be higher than about 7 m above the water level. To overcome this limitation, and make it possible to place the pump above the suction limit, some pumps inject a jet stream of water into the suction pipe inlet. The kinetic energy of the injected water is partly converted into extra pressure, which helps to lift the water above the suction limit of the pump.

Centrifugal pumps are not energy-efficient, especially in the smaller size ranges (that are most common for rural water supply applications). Centrifugal pumps are still used for solar pumping but as electronics have become cheaper and more sophisticated, progressive cavity pumps have become more common. It is not unusual for a centrifugal pump to be found to be oversized, having been poorly selected for its intended duty. This causes a significant waste of energy. In general, centrifugal pumps with inverters and AC motors have efficiencies of 20 to 40%.

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2012-08-22

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