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Close Coupled Pumps

What is a close coupled pump?

A type of pump that involves an impeller as the central element of the motor component. The pump doesn’t have a separate coupling, and thus eliminate coupling alignment, one of the more expensive and time-consuming operations of pumps that aren’t close-coupled.

How do they work?

In a close coupled pump, the impeller is on the same shaft as the electric motor that drives the pump. The motor has a machined face on one end, which matches the face on the pump casing that is mounted against the motor face. The bearings that are in the motor must handle the forces generated by the pump, since it doesn’t have its own separate bearing housing.

What applications are they used?

The simplicity, versatility, and relatively low cost of this type of pump make them useful in many industries. They typically are used with relatively simple seals, so they are limited as to temperature and to relatively non corrosive liquids. Because the bearings are located in the motor, close couple pumps are limited in size to about 40-50 hp for most applications.

Other related Pump Types include: industrial pumps, horizontal split case pumps, process pump, chemical process pump.

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