Question 1 of 270705eccef9bbacbc34ba4d45478

Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?

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Question 1 of 27070
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Q

Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?

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🔍 Key Concepts

• Centrifugal pump principle of operation – how the impeller moves liquid and where pressure/velocity are highest • Difference between self-priming and needing to be primed before start • Relationship between impeller speed and discharge capacity/flow rate in centrifugal pumps

💭 Think About

• Think about where the liquid actually enters and leaves a centrifugal pump relative to the impeller: is it at the center (eye) or the outer edge? • Consider whether centrifugal cargo pumps on tankers normally can start with only vapor/air in the suction, or if they must already be filled with liquid. • Ask yourself how changing the impeller speed affects the pump’s flow: is it a straight-line (direct) relationship, or does it follow a squared or cubed relationship?

✅ Before You Answer

• Verify how liquid moves inside a centrifugal pump: enters at the impeller eye and is thrown outward by centrifugal force. • Check whether standard marine centrifugal cargo pumps are inherently self‑priming or must be primed by other means (ejector/eductor, stripping system, etc.). • Recall the basic pump law for centrifugal pumps: flow (Q) ∝ impeller speed (N), head (H) ∝ N², and power (P) ∝ N³ – and decide which option is most consistent with these relationships.