Answer Posted / rahul tupe
LAW OF AFFINITY IS THE ANSWER...
(N1/N2)=(Q1/Q2)=(D1/D2)=(square root of (H1/H2))=(cube root
of (P1/P2))
N1 & N2=rpm at condition 1 & 2 respectively.
Q1 & Q2=capacity at condition 1 & 2 respectively.
D1 & D2=diameter of impeller at condition 1 & 2 respectively.
H1 & H2=head in meters at condition 1 & 2 respectively.
P1 & P2=required power in kw at condition 1 & 2 respectively.
considering centrifugal pump data....
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