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.
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./
Types of pumps used for fire service include: end suction, horizontal split case, vertical split case, vertical inline and vertical turbines.