A four-stage centrifugal pump has impeller 40cm in diameter and
2.5cm width at the periphery the vanes are curved back at the outlet at
300 and reduce the circumferential area by 15%. The manometric
efficiency is 85% and overall efficiency is 75%. The pump deliveries
0.06m3/sec of fluid and the impeller rotates at 12000rpm.
a) Head generated by the pump.
b) Shaft power.
c) The minimum speed for starting the pump if it works against a
head of 100m (provided outer diameter is equal to twice the
d) Discuss the Head –Capacity curve.