q - flow rate (m3/h, l/s, l/min, m3/min, US gpm, British gpm)
h = head rise (m, ft)
Note! When comparing pumps and their documentation - be aware of the units used.
Typical values for specific speed - Ns - for different designs in US units (US gpm, ft)
when
A pump has the capacity 1500 US gal/min (1249 British gpm, 340 m3/h, 5667 liters/min) at 100 ft (30.5 m) of head and is rotating at 1760 rev/min.
Ns(US gpm, ft) = (1760 rev/min) (1500 gal/min)1/2 / (100 ft)3/4
= 2156
Ns(British gpm, ft) = (1760 rev/min) (1249 gal/min)1/2 / (100 ft)3/4
= 1967
Ns(m3/h, m) = (1760 rev/min) (340 m3/h)1/2 / (30.5 m)3/4
= 2500
Ns(liters/min, m) = (1760 rev/min) (5667 liters/min)1/2 / (30.5 m)3/4
= 10209
Specific speed is also used when evaluating hydro-power turbines. Typical range of turbine specific speeds:
Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more.
An introduction to Centrifugal Pumps.
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