Fire hydrant installation consists of a system of pipe work connected directly to the water supply main to provide water to each and every hydrant outlet and is intended to provide water for the firemen to fight a fire. The Fire Hydrant Line is always kept pressurized with water.
HYDRANT SYSTEMS. ... Dry riser and wet riser are the two kinds of fire hydrants. The wet riser fire hydrant holds a constant water supply and while dry riser fire hydrant needs to have a valve to release to let water in.