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Dry/Wet riser systems

Dry/Wet Riser Systems

A brief guide Dry/wet risers are often called dry/wet rising mains. They are intended for use by the fire service to provide a readily available means of delivering considerable quantities of water to extinguish or to prevent the spread of fire.

Dry Riser Systems are installed in buildings for fire fighting purposes by trained personnel and which are normally dry and are capable of being charged with water by pumping from Fire Service Appliances, the systems are installed up to 50m above the Fire Service Access Level, Dry fire main water supply pipe installed in a building for fire-fighting purposes, fitted with inlet connections at fire service access level and landing valves at specified points, which is normally dry but is capable of being charged with water usually by pumping from fire and rescue service appliances.

Wet Riser Systems are installed in a buildings for fire fighting purposes by trained personnel and which are permanently charged with water from a pumped source, they are installed complete with Landing Valves at specified points on each, wet fire main water supply pipe installed in a building for fire-fighting purposes and permanently charged with water from a pressurised supply, and fitted with landing valves at specified points.

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.Click to edit text. Focus on how you can benefit your customers.

Dry risers will be found:

in buildings over 18 metres above ground level.
in low level buildings where there are excessive distances from entrances

Wet Riser

Wet riser: a system of valves and pipe work which is kept permanently charged with water, generally utilising pumps and tanks.

Wet risers will be found in buildings over 60 metres above ground level.

WHAT DOES A DRY/WET RISER LOOK LIKE?

Typical dry/wet risers contain the following components:

Large vertical pipe of 100mm or 150 metres diameter that can run internally or externally to the building
Twin/four-way inlet connection at street level boxed in a steel cabinet with glazed door for the dry riser only
Outlet valves at each landing
Automatic air release valve at the highest point to provide bleeding of air from the system when it is filled with water
Pump and tanks for wet risers only