(a) A centrifugal water pump has the following characteristics: Flow (l/s) Head (m) 0 120 10 110 25 90 friction loss can be taken as f 22 2g The system consists of 700m long of 150mm diameter pipes with a flow rate 201/s. The fitting loss, entry and exit losses are equivalent to 70m of the pipe length. The frictional factor of the pipes is 0.045. The height difference between the pump and the roof tank is 70m. The pipe 1 2 and the velocity d 2g head can be taken as pressure of the operation point. 30 80 45 50 Determine the flow rate and (b) Describe the major components of a centrifugal pump. Explain the differences in the material used in a fresh- water and a sea-water centrifugal pumps.