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Regenerative Turbine Pumps

What is a regenerative turbine pump?

A type of centrifugal pump that uses a rotating impeller to increase the velocity of the fluid. However, the impeller on a regenerative turbine pump looks quite different from a centrifugal type impeller. The impeller has radially oriented buckets or teeth, which make the impeller look more like a turbine rotor.

How do they work?

As the impeller of the pump rotates, building the velocity of the liquid, it moves the liquid in a circular path through the turbine buckets. The circular path through the buckets provides the diffusion that converts velocity to pressure. The pump can build much higher head (pressure) than a traditional centrifugal pump, and in a more compact machine. Because the clearances in regenerative turbine pumps are much tighter than in a traditional centrifugal pump, the pumped liquid must be very clean. Also, the tighter clearances make this pump type noisier than a traditional centrifugal pump. The shape of the pump head-capacity curve in the pump is much steeper than for a traditional centrifugal type. And, the horsepower versus capacity curve is reversed from a traditional centrifugal type, with the highest horsepower being back toward zero flow.

Where are they used?

Because this pump is capable of moving high-temperature fluids at high pressures, they're useful in a wide range of industrial applications. They're commonly found in small boiler feed services in bakeries, dry cleaners, breweries, and other commercial plants, and are also used to circulate cooling water in lasers and other machines where high head is required.

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