In short, to avoid failures, centrifugal pumps must always be primed before operating. Positive displacement pumps are self-priming with suction lift capability, but always check the operation manual or confer with an engineer to ensure the pump will properly function at start up without priming first.

Which pumps need priming?

Normally, Centrifugal pumps need priming and Positive Displacement Pumps (Rotary Pumps, Reciprocating Pumps) does not require priming. However, for the first time operation all pumps need priming to avoid overheating and failure by dry running condition.

Does centrifugal pump need priming?

Priming simply means preparing or getting something ready for operation. For a centrifugal pump to work properly, you need to fill it up with water. ... Most centrifugal pumps are incapable of pumping vapours or gases and continuously doing so will damage the pump impeller.