The lowest flow at which a centrifugal pump can be safely operated for extended periods of time. Operation below this recommended limit can lead to high vibration and excessive heat inside the pump volute. Low-flow conditions are normally caused by throttling a pump discharge valve. The table below provides basic guidelines for minimum and maximum flow based on the pump’s suction specific speed. (Example: A pump with a suction specific speed of 10,000 in US units [11,627 m3/h] can be operated reliably from 77% to 109% of its best efficiency point.)
Compare to Maximum Continuous Stable Flow.
See Suction-Specific Speed to convert US-specific speed values to metric-specific speed values, and vice versa.