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Pumps CAN suck water, but there is a limit to the height of the column of water they can draw up from the bottom of a well.

This limit is based on the fact that water will boil at room temperature if you reduce the air pressure. In other words, the greater the height that pump has to draw water, the more likely it is to cavitate.

The simple way around this is to locate the pump at the bottom of the well.

A good example is a Condensate Extraction Pump in a Power Station. It has a long vertical shaft, and pumps the condensate from several metres below the Hotwell underneath the Condenser. Because the Condenser operates at a vacuum, the long shaft improves the Net Positive Suction Head (NPSH) of the Pump.

For pumps located above the water level, a priming procedure is required to charge the pipe between the suction point and the pump. Such pumps are normally fitted with a foot valve to prevent the leg draining and thus losing prime.

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13y ago

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