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Motor size depends upon number of factore.

1- flow of pupm

2- required head

3- efficiency of pupm used

4- efficiency of electric motor used

The formula is

H.P required= Q.H\ 3960. Pump efficiency. Motor efficiency

where Q= GPM

H= Ft

Efficiency= In fraction( 70 % = 0.7)

Engr. Usman Khalid

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