Which components are rotating in a centrifugal pump?

Which components are rotating in a centrifugal pump?

• A. Shaft and Impellers
• B. Bearings and Seals
• C. Base Plate and Casing
• D. Inlet and Outlet Piping

Answer: (A)

The moving parts that actually drive the fluid are the shaft and the impeller. When the motor rotates the shaft, the impeller, which is mounted on that shaft, spins with it. This rotation transfers energy to the fluid, accelerating it and increasing its pressure as it moves outward and toward the discharge. The bearings mainly support the rotating shaft but stay fixed relative to the pump frame; seals, base plate, casing, and inlet/outlet piping remain stationary, forming the surrounding structure. So the combination that rotates to impart energy to the fluid is the shaft together with the impeller.

The moving parts that actually drive the fluid are the shaft and the impeller. When the motor rotates the shaft, the impeller, which is mounted on that shaft, spins with it. This rotation transfers energy to the fluid, accelerating it and increasing its pressure as it moves outward and toward the discharge. The bearings mainly support the rotating shaft but stay fixed relative to the pump frame; seals, base plate, casing, and inlet/outlet piping remain stationary, forming the surrounding structure. So the combination that rotates to impart energy to the fluid is the shaft together with the impeller.