Pump power is the product of flow rate in cubic metres per second, density of fluid in kg/cubic meter, acceleration due to gravitational force, 9.81 m/second squared and head in metres. The shaft power (kW) will then be this pump power divided by pump efficiency.
PUMP POWER CALCULATION is made easy at http://www.engineeringtoolbox.com/pumps-power-d_505.html
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