Water flows at a rate of 20 L/s through a horizontal pipe whose diameter is constant at

Question:

Water flows at a rate of 20 L/s through a horizontal pipe whose diameter is constant at 3 cm. The pressure drop across a valve in the pipe is measured to be 2 kPa, as shown in Fig P12??55. Determine the irreversible head loss of the valve, and the useful pumping power needed to overcome the resulting pressure drop.