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Dry Risers

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This is a pipe that fire hose can be connected to through inlet valves at ground level to supply firefighting water to a building.
There are outlet valves on every floor from which firefighters can take water. Buildings with a floor at more than 20 m above ground level should be equipped with wet or dry rising fire mains.

Buildings with a basement at more than 10 m below ground level, basement storeys should be equipped with wet or dry fire mains.
The Dry Riser pipe is maintained empty of water.

A Dry Riser comprises of an inlet connection, which is an external access point at ground level through which water can be pumped from the fire engines to outlet valves located on every floor.
Air Release Valve located on the top of the system to expel the air and a Drain Valve to completely drain the riser after use.
Dry Risers must have Fire Engine access within 18 meters of the dry riser inlet box.

Dry Riser Test

• Carry out a visual inspection service of the entire system that can be accessed.
• Replace Instantaneous rubber washers as required.
• Check Air Release Valve is in place and operating correctly.
• Pressurise the riser with water to 10 bars measured at the inlet for a period not less
than 15 minutes
• Whilst test is in progress check entire system for any obvious leakage
• No appreciable loss in pressure (0.5 bar) shall be seen whilst the test is in progress or
the test shall be failed
• Drain dry riser completely on completion of test.

“Best practice for a Dry Riser maintenance plan would be to inspect the
system on a 6 monthly basis and a full Pressure Test Yearly”
Reference:
Building Regulations 2006 Technical Guidance Document B Fire Safety Section 5 Fire fighting mains
BS 9990:2015 gives recommendations for non-automatic fire-fighting systems in buildings. It covers best practice in
matters affecting the design, installation, testing and maintenance of such systems including wet and dry fire-fighting
mains.
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