If suction prime is lost due to piping issues, what is a common consequence?

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Prepare for the NFPA 20 Fire Pump Certification Exam. Study with quizzes featuring flashcards and multiple-choice questions, complete with explanations. Excel in your certification journey!

Multiple Choice

If suction prime is lost due to piping issues, what is a common consequence?

Explanation:
When the suction prime is lost, air fills the suction line so the pump can’t pull water effectively. Without a continuous column of water, the impeller can’t develop the designed head, leading to a drop in flow and discharge pressure. In other words, the pump can’t meet the system’s demand, so its performance falls off. The other outcomes aren’t typical consequences of losing prime: discharge pressure wouldn’t rise; there’s no automatic gain in pump life or fuel savings—quite the opposite, since running without prime can stress the pump and reduce reliability.

When the suction prime is lost, air fills the suction line so the pump can’t pull water effectively. Without a continuous column of water, the impeller can’t develop the designed head, leading to a drop in flow and discharge pressure. In other words, the pump can’t meet the system’s demand, so its performance falls off.

The other outcomes aren’t typical consequences of losing prime: discharge pressure wouldn’t rise; there’s no automatic gain in pump life or fuel savings—quite the opposite, since running without prime can stress the pump and reduce reliability.

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