Wet rising and dry rising mains are intended for use by the fire service 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 fitted at ground level to enable the fire brigade to connect to the water supply.
Dry risers have to have fire engine access within 18 metres of the dry riser inlet box.
Wet risers are vertical mains kept permanently charged with water, either from a storage tank (via a booster pump) or direct from the town’s main water supply. Before installing dry or wet rising mains the exact requirements of the local fire service must be ascertained.
Dry rising mains should be installed in buildings where any floor is at a height between 11 and 50 metres above ground level or where any floors are more than 10 metres below ground floor level. Any buildings over 50 metres will require a wet riser to be installed in accordance with BS9990/2015.
Site engineers will fabricate on-site and make sure the installation is done to design drawings. Any alterations will be dealt with as soon as they arise. Viva Fire Protection Ltd do not use sub-contractors, we have our own teams of engineers with well over 25 years of combined experience within the industry. Therefore we can guarantee all projects undertaken will adhere to our highest standards. We also allocate a dedicated project manager and site supervisor to each project.
Ideally, a hole should be formed between 400mm – 600mm. The centre of the hole should be approximately 750mm from finished floor level.
All holes should be core drilled 150mm O/D a minimum of 50mm away from any wall. This is to ensure there is sufficient clearance for couplings & brackets etc.
From the back of the pipe to the front of the valve is approximately 450mm using standard flanged valves. This can be reduced to approximately 350mm if Right Angles Valves are used.