What is a wet and dry riser?
Dry riser: a system of valves and pipe work which enables the fire service to pump water onto upper floors of a building. Wet riser: a system of valves and pipe work which is kept permanently charged with water, generally utilising pumps and tanks. in buildings over 18 metres above ground level.
What do you mean by dry riser?
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 a water flow riser?
The riser room is the room or designated space where the control room of the fire sprinkler system is kept. These system risers contain the pressure gauges, control valves, water flow alarms, and main drains for the sprinkler system.
What is a wet riser outlet?
Wet risers are used to supply water within buildings for firefighting purposes. Wet risers are permanently charged with water. This is as opposed to dry risers which do not contain water when they are not being used, but are charged with water by fire service pumping appliances when necessary.
What is a dry riser made of?
A dry riser is designed to help firefighters easily access water on all floors and compartments during fire fighting emergencies. Made up of a system of water inlets, pipes, and outlets spread out through a building across all levels, these systems are normally situated along the building’s fire fighting shaft.
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 do you test a dry riser?
Annual Dry Riser Testing This includes a hydraulic pressure test (or wet pressure test). Using a fire service approved hose and water pump the system is filled with water to a pressure of 12 bar (175psi) for a minimum of 15 minutes. This tests the system for any leaks.
What is dry sprinkler system?
Dry pipe sprinkler systems are filled with pressurized air or nitrogen instead of water to prevent frozen and burst sprinkler pipes in areas with colder temperatures. The pressurized air in the sprinkler pipes prevents water from entering the pipes.
What are riser valves?
WATERMAN OVERFLOW RISER VALVES provide regulation and shut-off of flow from pipelines to furrows or checks. WATERMAN ALFALFA VALVES are commonly used with Waterman Universal Hydrants for connection of portable surface pipe.
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.
How does dry riser work?
How often should dry risers be inspected?
every six months
How often should a dry riser be tested? BS9990:2015 requires dry risers to be tested under pressure annually with a visual inspection every six months. Replace any worn or missing parts including washers, straps, padlocks, gaskets etc.
