Which statement is true of centrifugal pumps aboard tank vessels?

Centrifugal pumps are commonly used aboard tank vessels due to their efficiency and ability to handle large volumes of liquid. They operate by converting rotational energy, typically from an electric motor, into hydrodynamic energy. This energy allows the pump to move fluids from one place to another, relying primarily on the centrifugal force generated by the impeller.

The correct understanding of centrifugal pumps does not align with the notion of them being gravity-fed. In fact, they do not depend on gravity for their operation. Instead, they use suction to draw fluid into the pump and then expel it under pressure. This means they are not designed to function solely based on gravitational force, which would limit their capability to pump fluids against pressure.

Each of the other statements presents concepts that are characteristic of different types of pumps or do not accurately describe centrifugal pumps. Recognizing the nature of centrifugal pumps is crucial in various marine operations, especially in ensuring the proper handling of liquids during cargo transfers aboard tank vessels.