Comparative Data

Proper Pump Selection

Although the operating principles of positive displacement and centrifugal pumps differ widely, both types of pumps can be used to serve many of the same applications. In these instances, certain positive displacement pumps may offer substantial opportunities to improve processes and productivity as well as maintenance and energy cost savings. Positive displacement pumps generally require less NPSHA* than centrifugal pumps, and they offer more flexibility relative to dealing with varying changes in pressure and flow requirements of continuous-type processes.

Also, positive displacement pumps maintain higher efficiencies throughout the viscosity range. Therefore, in the overlap where both types of pumps can operate, positive displacement pump’s high mechanical efficiency can offer improved energy efficiency.

* Net Positive Suction Head Available