CHAPTER 6
VELOCIS SOLUTIONS @2018
5
Where:
𝐴 − conversion constant (for metric system is equal to 1)
𝑁 − revolutions per second [rad/s]
𝑞 − flow, [m
3
/s]
𝐻 − head, [m]
Centrifugal pumps are characterized by their specific speed. The specific speed for centrifugal
pumps usually lies between 400 and 10,000, depending on the type of impeller. Generally, pump
impellers are classified as radial for specific speeds between 400 and 1000, mixed flow between
1500 and 7000, and axial above 7000. Doolin (1977) states that below a specific speed of 1000 the
efficiency of single-stage centrifugal pumps is low and multi-stage pumps should be considered.
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