The pressure rise across a water pump is 35 psi when
the volume flow rate is 500 gpm. If the pump efficiency is 80
percent, determine the power input to the pump.
A 125-mm-diameter pipeline conveying water at 10C
contains 50 m of straight galvanized pipe, 5 fully open gate
valves, 1 fully open angle valve, 7 standard 90 elbows, 1
square-edged entrance from a reservoir, and 1 free discharge.
The entrance conditions are p1 5 150 kPa and z1 5 15 m, and
exit conditions are p2 5 0 kPa and z2 5 30 m. A centrifugal
pump is installed in the line to move the water. What pressure rise must the pump deliver so that the volume flow rate
will be Q 5 50 L/s?