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.

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 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

DRY & WET RISER SYSTEM FACTS

FACT NO.1
FACT NO.2
FACT NO.3
FACT NO.4

Get in touch today to see how we can help


M&P Fire Protection Ltd. is part of PTSG, a UK market leader that specialises in access and safety, electrical services, specialist building access and fire solutions.

Click this box to learn more about our wider service offering, including information about what we can do to help you.