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What is Net Positive Suction Head (NPSH) and does it apply to fire pumps?

April 26, 2017Head NET npsh positive Pumps suction

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What is Net Positive Suction Head (NPSH) and does it apply to fire pumps?

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Net Positive Suction Head (NPSH) does not apply to any reputable fire pump manufacturer. Since fire pumps are designed for a unique industry that requires them to work when needed, water must be delivered to the pump via gravity to ensure a pump prime at all times; using an artificial priming system does not guarantee pump function 100% of the time. Because just 3% of air into a pump’s casing can cause it to be inoperable, manufacturers require a “flooded suction” at all times.