The fire pumps pressurize the sprinkler system, the sprinkler system, the hose installation in the fire cabinets, and the hydrant installations, which we call the fire brigade. Fire pump systems consist of main pumps and jockey pump. Main pumps must be designed as redundant. If a main fire pump is used in the system, there must be a spare pump with the same capacity. In case of more than one pump, a sufficient number of spare pumps are used, provided that at least 50% of the total capacity is backed up. For example, in a system with 2 main 1 backup pumps, each of the pumps can be selected to meet 50% of the system capacity.