Abstract
Instances of parameter invariability (delivery and head) are rather infrequent during centrifugal pump operation. As a rule, the pump should provide for delivery within a certain range of values for which regulation must be employed. For a number of reasons, it is frequently necessary to vary the parameters in the pump system--for example, decrease the delivery. This regulation of pump parameters can be accomplished by different methods with substantially different energy demands: by using a bypass, a gate valve, undercutting of the rotor in terms of outside diameter, and by varying the rotation frequency of the pump's shaft. The energy savings may be extremely large on varying the speed of the pump's shaft, especially when the range of regulation in terms of delivery is increased. Experience has shown that despite the high cost of speed regulators, their use is more economical. There are several methods of regulating the rotation frequency of pump drives. Among them are variable belt drives, hydrodynamic speed regulators, AC electric motors and thyristor frequency converters. The article gives the advantages and disadvantages of each method.
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