Axial split pump main components

Axial split pumps consist of three main components:

Impeller: The impeller is a rotating disk with vanes that accelerates the fluid. It is connected directly to the pump shaft and electric motor. Different types of impellers are used based on the specific gravity and viscosity of fluids. Closed impellers are most common in split case pumps for handling water-like fluids.

Casing: The casing (housing) consists of two separate chambers, suction and discharge. The chambers fully enclose the impeller and provide pathways for the fluid to enter and exit. Casings are split axially (horizontally) so impellers can be accessed and maintained without disturbing piping. Casings are made of cast iron, stainless steel or bronze.

Shaft & Bearings: The shaft transmits rotation from the motor to turn the impeller. Bearings enable smooth shaft rotation and support radial forces. Split case pumps use bushings, ball bearings or oil-lubricated journal bearings. Larger pumps may require packing glands to seal and lubricate shafts.