Which centrifugal pump component is the housing that contains the impeller?

Which centrifugal pump component is the housing that contains the impeller?

• A. Diaphragm
• B. Piston
• C. Rotor
• D. Volute

Answer: (C)

In a centrifugal pump, the part that surrounds the rotating impeller is the volute, also called the pump casing. This stationary housing encloses the impeller and has a spiral/gradually expanding cross-section that collects the fluid as it leaves the impeller and directs it toward the discharge. As the fluid slows in the volute, its velocity energy is converted into pressure, helping to produce the pump’s head. The rotor, by contrast, is the rotating assembly that includes the impeller and shaft, not the housing. Diaphragm and piston are components associated with other pump designs, not the centrifugal pump’s housing.

In a centrifugal pump, the part that surrounds the rotating impeller is the volute, also called the pump casing. This stationary housing encloses the impeller and has a spiral/gradually expanding cross-section that collects the fluid as it leaves the impeller and directs it toward the discharge. As the fluid slows in the volute, its velocity energy is converted into pressure, helping to produce the pump’s head. The rotor, by contrast, is the rotating assembly that includes the impeller and shaft, not the housing. Diaphragm and piston are components associated with other pump designs, not the centrifugal pump’s housing.