A centrifugal pump impeller has an outside diameter of 290mm and the with at the outlet is 110mm. The vanes are set back at an angle of 35 degrees to the tangent to the impeller at the vane tip. The diameter of the suction and delivery pipes is 290mm. Gauges at points on the delivery and suction pipes close to the pump and Ravi each 1.5m above the sump level showed heads of 18.6m above and 3.4m below atmosphere respectively while the pump was delivering 180 l/s at a speed of 1200 rev/min. It requires 68kW to drive the pump. Assume the water enters the impeller radially and without shock. Calculate the overall efficiency, manometric efficiency Abe the pressure head loss in the suction pipe