What is the connection between Suction Specific Speed and Minimum Flow?

Suction specific speed and inlet vane angle

The connection between suction specific speed Sω (NSS) and minimum flow (Qmin) is that, in general, a higher value of Sω (NSS) is associated with a higher value of Qmin.  Beyond that generalized statement, however, there is wide range of deviation and exception. For rotodynamic (centrifugal, mixed-flow and axial flow) pumps suction specific speed is the main […]

What is the Purpose of Minimum Flow?

Chart of pump phenomena and minimum flows

Over the years use of the term “minimum flow” has evolved.   Decades ago industrial centrifugal pump manufacturers quoted a single, relatively low value for minimum flow intended to prevent users from running their pumps to destruction.  The term “minimum flow” generally meant the lowest continuous flow the pump was permitted to operate, without reference to […]