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Fire pumps are "sized" to deliver a specific volume at a specified pressure. These numbers can vary widely, and are the design parameters to which the pump is built.
Typically, the sizes range from a small pump, rated at a flow of only 25 gallons per minute (gpm), up to a pump that can deliver a flow of 5,000 gpm. NFPA 20, Standard for the Installation of Stationary Fire Pumps for Fire Protection, contains a design table with the typical pump outputs, but specially ordered pumps can be of a different or higher rating.
The pressure rating of a fire pump is specified to fit a specific design requirement, based on the needs of the fire protection system. The pressure specified will also depend on any pressure available from the existing supply to the pump.
© Hughes Associates,Inc. 2012