What is the function of the centrifugal pump casing?

What is the function of the centrifugal pump casing?

• A. Convert velocity to heat energy
• B. Convert energy to torque
• C. Convert high velocity to high pressure
• D. Convert pressure to velocity

Answer: (C)

The function of the centrifugal pump casing is to convert the fluid’s velocity energy into pressure energy. When the impeller sends fluid outward, it has high velocity. The casing (often a volute) is shaped to gradually slow that flow, which turns the velocity head into an increase in static pressure. This rise in pressure is what enables the pump to discharge fluid at a higher pressure. It’s not about turning velocity into heat or generating torque on the fluid—the motor provides the driving energy and the casing’s job is to recover the impeller’s velocity energy as pressure.

The function of the centrifugal pump casing is to convert the fluid’s velocity energy into pressure energy. When the impeller sends fluid outward, it has high velocity. The casing (often a volute) is shaped to gradually slow that flow, which turns the velocity head into an increase in static pressure. This rise in pressure is what enables the pump to discharge fluid at a higher pressure. It’s not about turning velocity into heat or generating torque on the fluid—the motor provides the driving energy and the casing’s job is to recover the impeller’s velocity energy as pressure.