The specific speed (Ns) of the pump is given by the expression

1
\(N_{s}=\frac{N\sqrt{Q}}{H_{m}^{5/4}}\)
2
\(N_{s}=\frac{N\sqrt{P}}{H_{m}^{3/4}} \)
3
\(N_{s}=\frac{N\sqrt{Q}}{H_{m}^{3/4}}\)
4
\(N_{s}=\frac{N\sqrt{P}}{H_{m}^{5/4}}\)

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