- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 15 Aug 2015
Dry risers are used to supply water within buildings for fire-fighting purposes. The provision of a built-in water distribution system means that fire fighters do not need to create their own distribution system in order to fight a fire and it avoids the breaching of fire compartments by running hose lines between them.
Dry risers do not contain water when they are not being used, but are charged with water by fire service pumping appliances when necessary. This is as opposed to wet risers, which are permanently charged with water.
Dry risers have an inlet connector at rescue service vehicle access level and landing valves at locations on each floor. Part B of the building regulations (Fire Safety) requires that fire mains are provided in buildings that are more than 18m tall. In buildings less than 50m tall, fire mains can be either dry or wet risers, however, where a building extends to more than 50m above the rescue service vehicle access level, wet risers are necessary as the pumping pressure required to charge the riser is higher than can be provided by a fire service appliance, and to ensure an immediate supply of water is available at high level.
Each inlet connector must be within 18m of a fire service appliance access. Inlet connectors are typically contained in accessible, but secure enclosures on the external face of buildings and are identified as a ‘dry riser inlet’.
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.
Dry risers should be inspected and tested regularly to ensure equipment is functioning correctly and ready for use. Problems can be very serious in the event of a fire, and are typically caused by vandalism or theft, blockages or pipework failure or by connection failure or outlets being open.
 Related articles on Designing Buildings Wiki
- Approved documents.
- Building regulations.
- Fire and rescue service.
- Firefighting route.
- Joint fire code.
- Protected escape route.
- The Regulatory Reform (Fire Safety) Order 2005.
- Unprotected escape route.
- Wet riser.
 External references.
Featured articles and news
HAB is a bridge design concept which incorporates an integrated hydraulic system in order to carry more weight.
ICE publish a discussion paper looking at the role of the engineer in creating inclusive cities.
A PQP describes the activities, standards, tools and processes necessary to achieve quality in a project's delivery.
How Lidl has been actively working to reinforce their brand through sustainability.
Association of British Insurers describe full-scale cladding tests as 'utterly inadequate'.
This article examines the changing policy commitments and evolving definitions of the zero carbon home.
Researchers believe they may have created a 'game-changing' new form of concrete using graphene.
Grouting refers to the injection of materials into a soil or rock formation to change its physical characteristics.
Part of Designing Buildings Wiki, BREEAM Wiki will advance knowledge sharing for the BRE family of sustainability tools.
From the decorative to the utilitarian, and from the photographed to the forgotten.
New BRE book considers the progression from project-based knowledge creation to whole-life urban knowledge management.
This CIOB article explores the concept of value in building design and construction.