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Hydrant Mains and Risers

Hydrant Mains

It is essential that the Fire and Rescue Service get immediate and localised water supply to fight fire, and private fire hydrants will provide just that. Hydrants are a valuable asset in the fight against fire and an essential item of fire fighting equipment.

Spiral systems are normally provided by valved connections from the local Water Authority mains network but, where suitable pressures and/or flows cannot be met, Spiral can install dedicated water supplies in the form of fire pumps and water storage.

High risers – Wet & Dry

The Fire and Rescue Service are sufficiently equipped to deal with most fires involving multi-storey buildings up to 18m high, but above this height buildings have to be constructed with fire fighting shafts provided with fire mains. These fire mains take the form of dry or wet risers.

Dry Risers

A dry riser system can be installed in buildings with floors up to 50m above the Fire and Rescue Service access level.
The system consists of a two way inlet breeching connection into which the fire appliance can pump water. This fills the rising main so that water is available at landing valves in fire fighting lobbies located at each floor level. Fire fighters can then attach their hoses to these outlets and tackle any fire from a secure bridgehead.

Wet Risers

Wet riser systems are very similar to dry, except that they are permanently charged with water. They come into their own where floors are over 50m above the Fire and Rescue Service access level and where supply pressures exceed those of the fire appliance.
A dedicated water supply for the wet riser system consists of a water storage tank and usually two fire pumps. With pressure regulated landing valves located in fire fighting lobbies at each floor level, fire fighters can then tackle any fire from a secure bridgehead.