A recirculating, or bleed off line is installed on a centrifugal pump in order to __________.

Correct Answer: Option C — prevent the pump from overheating when operating at shutoff head

Centrifugal pumps generate heat when operating at shutoff head because the impeller churns the trapped fluid. A recirculating line provides a bypass flow path, ensuring sufficient liquid movement to dissipate this heat, preventing internal damage to the pump casing and impeller as required by standard marine machinery maintenance practices.