Is a dry riser a fire hydrant?
A dry riser is a normally empty pipe that can be externally connected by firefighters to a pressurised water source. It is a vertical pipe intended to distribute water to multiple levels of a building or structure as a component of the fire suppression systems.
What is dry riser in fire fighting system?
Dry riser: a system of valves and pipe work which enables the fire service to pump water onto upper floors of a building.
What is riser in hydrant system?
Wet risers provided in high rise buildings (more than 23 M in height). In these systems, the riser pipe is always full of water, and is pressurized using gravity tanks, or dedicated fire pumps. Fire brigade inlets are also provided on wet riser systems, to provide water in case of failure of the system fire pumps.
Why is it called a dry riser?
The reason it is called a ‘dry’ riser is that there is no water in the pipe; the pipe is filled with compressed air which prevents water entering the pipe unless a fire activates one of the sprinklers. The inlet for the dry riser is visible on the outside of the building at ground level.
How does a dry riser work?
How do Dry Risers Work? The fire fighters fill the dry riser pipe with pressurised water by connecting the fire engine hose to the inlet on the ground floor. They can then connect hoses directly to the lifesaving water supply on the floor nearest to the fire using the outlet valves connected to the dry riser.
Do I need a dry riser?
Regulations for the installation of dry risers in the UK It is a legal requirement that any new dry riser should meet these standards. In summary: Dry risers should be installed in buildings where the floor is between 18 & 60 meters above ground level.
Where are dry risers located?
Dry risers themselves should be within fire-fighting shafts, and where necessary in protected escape stairs. Dry riser outlets, or landing valves, may be located in protected lobbies, stairs or enclosures where these are available.
How often should dry risers be checked?
Every 12 months
Dry risers are required to have a 6 monthly visual check, Every 12 months a water test should be carried out to 12 bar for 15 minutes.
How big does a dry riser need to be?
Dry riser pipework comes in two different sizes 4 inch and 6 inch. Most dry risers are installed in 4 inch galvanised steel pipework and this is generally sufficient. Six inch is only used if you have more than one landing valve per floor or your building height requires a larger volume of water on the higher floors.
What is a dry riser and how does it work?
A dry riser is a main vertical pipe intended to distribute water to multiple levels of a building or structure as a component of the fire suppression systems. Outlets are strategically placed to allow the fire service a connection on each floor to fight the fire directly from inside the building without manoeuvring hoses up through the building.
Why choose lindlindum fire services for dry riser maintenance?
Lindum Fire Services carries out dry riser maintenance on all types of dry riser systems across the UK. Our engineers are fully qualified dry riser maintenance technicians. With over 20 years of experience, our specialists have maintained dry riser technology in all types of buildings and environments.
Do dry risers need to be inspected?
Dry risers in occupied buildings have to be within a fire resistant shaft, usually one of a building’s fire escape staircase enclosures. BS 9990:2006 requires the system to undergo an annual static pressure test and inspection and a six monthly visual inspection, by a competent person.
Do wet risers have water supply?
It is possible but rare for the fire department to provide the wet risers with water supply as the storage tank is running low.