Main components of a well designed hydrant system are as follows: -

(A) Fire Water Reservoir:

Tanks of adequate capacity depending upon the risk to be covered, arrangement should be made
to divide these tanks in two compartments such that one compartment is always available for service while the other can be taken out for cleaning or maintenance purposes.

(B) Riser Mains:

These are provided
Where the hydrants are provided
On upper floors of the building.
These have one main isolation
valve at the ground level.

(C) Jockey Pump:

A pump of 500 liters/minute capacity is installed for maintaining pressure in the network. As & when the pressure drops this pump starts automatically to raise the pressure to preset pressure / cm2 & then stopping by itself. In case the pressure drops below the set pressure the main pump startsautomatically.

(D) Main Pumps:

A minimum of two pumps one electric & the other diesel driven (standby) should be installed to
provide water to the installation at a required pressure. It is preferable to make them start automatically once the pressure drops, below the minimum required. Both pumps can be electrically
driven provided the source of power supply is from different sources. The capacity of the pump
shall be according to the nature of Hazard.

Large quantity of water require for quenching major fires in the industries Easy accessibility in the shortest possible time is of  paramount importance in  controlling & putting out these fires.
Fire hydrant System is designed to serve these requirements.