Dry Riser Systems
Dry Riser systems comprise vertical mains normally fitted into staircase enclosures with outlet valves on each floor ready to deliver a supply of water to fire fighting hoses. An external inlet valve at ground level enables connection with a water supply, normally from a fire appliance. Dry risers are normally installed in buildings which are more than 18m high, although if a building has more than 18 storeys then a wet riser (which is permanently charged with water) will be installed.
A typical dry riser system will comprise a vertical 100mm diameter pipe, with a twin inlet connection at street level, an outlet valve at each landing and an automatic air release valve at the highest point.
