Question

A centrifugal pump provides a flow rate of 0.03 m/s when operating at 1750 rpm against 60 m head. Determine the pump's flow rate and developed head if the pump speed is increased to 3500 rpm.

Answer 1

Answer:240m

$Q=0.06m^3/s$

Explanation:

Given rpm increases from 1750 rpm to 3500 rpm

initial head 60 m and flow rate=$0.03 m^{3}/s$

Since unit speed remains same

therefore

$N_u=\frac{N}{\sqrt{H}}$

$\frac{1750}{\sqrt{60}}$=$\frac{3500}{\sqrt{H}}$

H=240m

Also unit Flow remains same

$\frac{Q}{\sqrt{H}}$=$\frac{Q}{\sqrt{H}}$

$\frac{0.03}{\sqrt{60}}$=$\frac{Q}{\sqrt{240}}$

$Q=0.06m^3/s$