About Lesson
Principle of operation of centrifugal pump
- It consists of two basic parts, a rotary element called impeller and a stationary part (element) which is pump casing.
- The vanes are arranged in a circular array around an inlet opening at the center called eye of the impeller.
- The impeller shaft gets its drive from an engine or an electric motor coupled to the pump.
- Before starting the pump to operate, the pump casing and the suction pipe is filled with water.
- As a impeller rotates, the blades cause the liquid to rotate and in turn centrifugal force is developed which causes the liquid to be thrown outward from the impeller into the casing.
- The outward flow of water through the impeller reduces pressure at the inlet, allowing more water to be drawn in through the suction pipe.
- The velocity of water is converted into pressure and the water is pumped out through the discharge pipe.