When beginning to ballast, which step should come first when using a centrifugal pump?

Correct Answer: Option C — Open the suction valves on the inflow side of the pump

Centrifugal pumps require a flooded suction to operate correctly and prevent cavitation, which can damage the impeller. Opening the suction valve first ensures the pump casing is primed with liquid before the motor is engaged. Opening the discharge valve subsequently allows for controlled flow and prevents excessive pressure spikes.