August 2004

Special Report: Fluid Flow and Rotating Equipment

Consider regenerative pumps for low-flow/low-NPSH applications

In low-flow applications they use less horsepower when 'curve run-out' is considered

Muller, S., Stepehns Mechanical Associates

The steady state nonpulsating flow patterns produced by both high-speed volute-type and standard-speed regenerative-type (regenerative turbine) centrifugal pumps are similar. Ease of maintenance and flow control give both of these centrifugal pump types certain advantages over the admittedly more efficient high-head, low-flow positive displacement pumps. Of course, the latter are known to exhibit pulsating pressure and flow characteristics. Notable exceptions notwithstanding, centrifugal pumps thus offer overall advantages that offset their reduced efficiencies at what are generally understood to represent low flowrates, i.e., rates below about 50 gpm. However, when selecting centrifug

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