A centrifugal water pump is considered to be fully primed when

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Prepare for the New York City Refrigeration License Exam I. Utilize flashcards, multiple-choice questions, and detailed explanations to boost your readiness. Ace your licensing exam!

Multiple Choice

A centrifugal water pump is considered to be fully primed when

Explanation:
Priming a centrifugal pump means removing air from the suction path and filling both the pump and its suction line with liquid. When fully primed, the entire suction side is flooded with liquid, with no air pockets, so the pump can develop suction and start moving fluid. If air remains in the suction line or pump, the pump won’t draw liquid properly and can cavitate, even if the impeller is turning. The discharge valve being closed doesn’t determine priming, and a suction line that is completely dry shows the system isn’t primed. The defining condition is that the pump is full of liquid.

Priming a centrifugal pump means removing air from the suction path and filling both the pump and its suction line with liquid. When fully primed, the entire suction side is flooded with liquid, with no air pockets, so the pump can develop suction and start moving fluid. If air remains in the suction line or pump, the pump won’t draw liquid properly and can cavitate, even if the impeller is turning. The discharge valve being closed doesn’t determine priming, and a suction line that is completely dry shows the system isn’t primed. The defining condition is that the pump is full of liquid.

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