What is a Dry Riser?2018-11-25T20:17:16+00:00

A Dry Riser is a main vertical pipe intended to distribute water to multiple levels of a building as a component of the in-house fire suppression systems. The pipe is maintained empty of water. The dry riser is the opposite of a “wet riser” or “wet standpipe” system where the pipes are kept full of water for manual or automatic fire fighting operations.

Dry Riser System

Dry risers are a building regulations requirement in occupied buildings over 18M tall but can also be found in car parks, multilevel basements or hospital corridors where the fire service access could be limited. A dry riser system is used by the fire services to distribute water to multiple levels of a building in an emergency.

A dry riser is a vertical pipe or a system of pipes and valves that extend to the upper storeys of an occupied building. Dry risers can consist of just 3 components which are external inlets, pipework and outlet points.   The external inlets need to be easy accessible by the fire service in an emergency.  The dry riser systems pipes are filled with compressed air which is released in an emergency to let water flow through the pipes. The outlet points are positioned on the upper storeys allowing firefighters easy access to water in the event of a fire.

Dry risers have to have adequate fire engine access within 18 m of the dry riser inlet box. Systems in occupied buildings have to be within a fire resistant shaft, usually one of a building’s fire escape staircase enclosures. Most commonly found in High Rise buildings, a Dry Riser systems has a number of key components, all of which are available through The National Dry Riser Testing Company.

At ground level is the Inlet Breeching which is located within an Inlet Breeching Cabinet. This is where the Fire & Rescue Services connect their water supply. The pressurised water travels through the external wall of the property to the interior and up through all floors terminating at the top floor. At each floor a dry riser gate valve (or landing valve) is accessible for internal connection and stored within an outlet cabinet. At the top of the vertical pipework a dry riser air release valve is fitted to allow the air within the pipework to escape when pressurised water is introduced via the inlet breeching.

Dry Riser High Rise Buildings

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