What is the outer shell of a pump called?

What is the outer shell of a pump called?

• A. Casing
• B. Volute
• C. Impeller
• D. Housing

Answer: (A)

The outer shell of a pump is called the casing. This shell forms the pressure boundary and surrounds the internal components, directing fluid from the suction side to the discharge side. A volute is a specific design inside the casing—it's the spiral passage that helps convert the impeller’s high-velocity flow into pressure—but it’s still part of the outer shell. The impeller is the rotating element that adds energy to the fluid, and housing is sometimes used interchangeably, but the standard term for the outer shell is casing.

The outer shell of a pump is called the casing. This shell forms the pressure boundary and surrounds the internal components, directing fluid from the suction side to the discharge side. A volute is a specific design inside the casing—it's the spiral passage that helps convert the impeller’s high-velocity flow into pressure—but it’s still part of the outer shell. The impeller is the rotating element that adds energy to the fluid, and housing is sometimes used interchangeably, but the standard term for the outer shell is casing.