Clean Agent Suppression Systems using HFC227EA gas
FM200® contains no bromine or chlorine and therefore has zero Ozone Depleting Potential (ODP).
The atmospheric lifetime of FM200® is between 31 and 42 years which along with its zero ODP presents a long-term solution to fire protection requirements.
FM200® has been found to be less toxic than Halon 1301, which makes it safe for use in the fully automatic mode in occupied areas.
Typically FM200® requires a design concentration of 7%, which is well below the 9% No Observable Adverse Effect Level (NOAEL) on cardiac sensitisation. The NOAEL for Halon 1301 is only 5% (the same as its design concentration).
FM200® is immediately available to protect most hazards
traditionally protected using Halon 1301. It is effective in the protection of data processing, telecommunications and electronic equipment as well as most flammable liquids and gases.
FM 200 Fire Suppression Systems
Concept Fire Suppressions HFC227ea Clean Chemical Fire Suppression Agent is widely used as a Halon replacement and is commonly called either FM200 or FE227, although there are a number of clean chemical agents on the market as follows:-
|Designated Name||Trade Name*|
|Not Applicable||Novec 1230|
Although stored as a liquid, FM200 and FE227 discharge as a gas due to the low boiling point -16.4deg C. It leaves no residue, is nonconductive and can be used in class A fires, electrical, wood, paper and fabric and class B fires, flammable liquids. FE-227 and FM200 were the first widely used Halon replacements, and is known as a heptoflouropropane and essentially uses the hardware previously used by Halon systems and stored in cylinders super pressurised to 25 or 42 bar although 25 bar is more usual.
The present understanding of the operation of FE227 and FM200 is that 80% of it%u2019s fire fighting effectiveness is achieved through heat absorption and 20% through direct chemical means (action of the fluorine radical on the chain reaction).
Cylinders are available in several different sizes from as small as 8L through to 180L. Where multiple cylinders are required they can be manifolded together or kept separate and distributed throughout the room, this is known as a Distributed Cylinder System. Pipework is standard schedule 40 and more usually arranged as a Distributed Cylinder System with a standpipe arrangements. This cuts down on the pipework required in comparison to a manifold system.
Nozzles are available in 1/2%u2033, 3/4%u2033 1%u2033, 1 1/4%u2033, 1 1/2%u2033 and 2%u2033 and can be 360 or 180 degree. 360 degree nozzles are used discharge of the agent is required in the centre of the area. 180 degree nozzles are located adjacent to the wall.
The master valve is actuated by a nitrogen cylinder which is triggered by a 24v dc signal from the detection control panel. Each cylinder is connected via Kunifer tubing to reduce the power requirement on the control panel.
Note: This article uses material from the http://intimefire.com