Centrifugal pumps are generally sized to handle the peak flow requirements, which typically occur for very short periods of time. Consequently, the equipment would be operated at reduced flows most of the time. For this example, the system would be operated below 70% flow over 94% of the time. Thus, this sort of duty cycle could provide energy savings by adjustable speed operation of the Centrifugal pump.

PUMP BASICS
An understanding of the basic operating characteristics of centrifugal pumps is necessary to apply these concepts to any particular application.
A  Centrifugal  pump curve describing the head (or pressure) versus flow characteristics of a typical Centrifugal Pump . This curve shows that the pump will produce limited flow if applied to a piping system in which a large pressure differential is required across the Centrifugal Pump to lift the liquid and overcome resistance to flow. Higher flow rates can be achieved as the required pressure differential is reduced . To determine where along this curve the Centrifugal Pump  will operate in a given application requires the additional information provided by
the system curve. This curve, shown in figure 5, represents the characteristics of the piping system to which the Centrifugalpump is applied.

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2012-07-04

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