What is one disadvantage of a centrifugal pump?

• A. Self-Priming
• B. Quiet
• C. Efficient
• D. Not Self-Priming

Answer: (D)

Centrifugal pumps rely on having a filled suction path to create suction and start moving fluid. If air sits in the pump or suction line, the pump can’t develop the necessary vacuum, so flow won’t begin. Because a standard centrifugal pump doesn’t prime itself, you must manually prime it before starting, filling the pump casing and suction line and ensuring there are no air leaks. This extra step is a disadvantage when the source isn’t already primed or when priming isn’t convenient, such as with long suction lines or reservoirs that aren’t easily kept full. In short, not being self-priming means you lose the automatic priming capability, which can complicate startup and reduce reliability in challenging suction situations.