Wet Riser System
A Wet/Dry Riser is a system of valves and pipework which enables the Fire Service to pump water on to the upper floors of a building. A Wet Riser is a system of valves and pipework which are kept permanently charged with water.
Dry and wet rising mains are intended for use by the Fire Brigade or other trained personnel. They provide a readily available means of delivering considerable quantities of water to extinguish or to prevent the spread of fire.
Dry risers are vertical mains fitted into staircase enclosures or other suitable positions, with outlet valves on each floor and inlets at ground level to enable the fire brigade to connect to the water supply. Wet risers are pipes that are kept permanently charged with water, either from a storage tank (via a boost pump) or direct from the mains water supply.
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