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The fire-pump delivers the water via the pipe-system to the fire sprinklers to suppress the fire. Fire pumps are powered either by an electric motor or a diesel engine or sometimes by a steam turbine. The number of fire-pumps installed depends on the occupancy hazard (LH, OH or HH) and specific fire installation standard. Some known can be seen in the table to the right.
Where twin electric fire pumps are installed, there is a requirement for a secondary power source. This can be from a separate feed to the nearest electricity sub-station, or from a generator located on site. A mains changeover facility should be incorporated into the design to allow for switching to this alternate power source in the event of a mains supply failure.
The fire pump starts when the pressure in the fire sprinkler system drops below a certain set-point. If one or more fire sprinklers are exposed to heat above their design temperature, and opens, the sprinkler system pressure drops and the pressure switches gives a signal and the duty pump starts. If the duty-pump, for any reason, does not start, the standby pump will start, usually from a secondary pressure switch.