The main parts, a centrifugal pump consist of are casing, impeller, shaft, bearing, and sealing.
The function of the centrifugal pump casing is to:
- Direct fluid into the eye of the impeller through the suction inlet.
- Minimize fluid recirculation from impeller discharge to impeller suction.
- Capture fluid discharge from the impeller in the case volute to most efficiently utilize work performed by the impeller and direct fluid away from the impeller. (See Picture 1. and 2.)