How Do Fire Pumps Work?

Fire pump systems contain a sensor which monitors the water pressure in the sprinkler pipes. When the sensor detects a small drop in the water pressure which is not enough to indicate a sprinkler was activated, it will start the jockey pump in order to drive the pressure up to the required standard. If a larger pressure drop is detected, and the jockey pump can’t keep the correct pressure, the main fire pump automatically starts up and feeds water under high pressure into the system.

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Further Reading:

when is a fire pump required? –