This is very effective extinguishing system suitable for various plants and high-rise buildings as well as commercial complexes. The system mainly consists of water storage reservoir (underground or aboveground), pump set, piping ring around the building and terminals in side the building, hydrant valves, hoses, branch pipes with nozzles and hose boxes. On the ring main the hydrant stand posts are provided with hydrant valves.
The system is of two types one is wet riser and other dry riser. The wet riser system is automatic type and dry riser is of manually operable.
In case of fire, the hose can be connected to the hydrant valve with the nozzles at the outlet end and the pump can be started. For automatic operation of the pump, the jockey pump is provided which normally pressurise the pipes and as soon as the valve is open and pressure reduces the main pump starts automatically.
With the help of pressure and ample amount of water, the jet from the nozzles can be projected at the base of fire to extinguish completely.