Formula (metric): Ns = N × √Q / H^(3/4)
N = RPM, Q = flow per eye (m³/s), H = head per stage (m)
Impeller type by Ns (metric):
• Ns < 20: Radial vane
• 20-40: Francis vane (radial)
• 40-70: Mixed flow
• > 70: Axial flow (propeller)
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