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pitts_pilot(at)bellsouth.
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 Posted: Wed Oct 03, 2007 5:38 am Post subject: (Halon Fire Bottle) |
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I'm surely no expert on fire suppression (starting them is more fun!  ), but here's my thoughts. If I understand it, Halon (or the newer 3-gas mix) works by depriving the fire of oxygen by chemically reacting to the high heat. So, with all the air coming in through the cowl for cooling, how does the Halon hang around long enough to work??? How long does it take for the bottle to completely discharge???
I sure would be ticked to find out that I've been carrying around the weight/cost of a system only to find out too late that it didn't work.
Maybe Rick Sked has some thoughts!! Anybody???
Linn
do not archive
David McNeill wrote:
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[b]
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ricksked(at)embarqmail.co
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| Posted: Wed Oct 03, 2007 8:09 am Post subject: (Halon Fire Bottle) |
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I can only add what I've heard/known from halon systems on fighters, the halon bottle discharges into the fuel cells and replaces the air space in the fuel cell with halon in the event the tank is hit. I believe it is a checklist step in actual combat. Good point on the halon disbursement into the cowl. Assuming the liquid hits the burning areas it should work as long as it remains a liquid converting to gas. FWIW Halon is not approved for class D fires or fires involving burning metals such as magnesium.
It is no longer being produced but still is available and It is mandated by the FAA I think for commercial air travel. Halon, real name "halogenated hydrocarbon" was the godsend of all agents because of it's ability to put out the fire and not damage electrical equipment with minimal hazards to people. Dry chemical and CB extinguishers are much better but damaging to material. CB can be a real health threat.
Halon 1211 (a liquid streaming agent) and Halon 1301 (a gaseous flooding agent) leave no residue and are remarkably safe for human exposure. Halon is most effective for flammable liquids and electrical fires (rated B:C) and is electrically non-conductive. Halon is a CFC, the production of new Halon ceased in 1994. There is no cost effective means of safely and effectively disposing of the Halon that has already been produced, therefore recycling and reusing the existing supply is the only solution. Similar to the plight of Freon.
Halon differs from all other extinguishing agents in the way it puts out the fire. It offers some of water's cooling effect and some of carbon dioxide's smothering action, but its essential extinguishing technique lies in its capacity to chemically react with the fire's components. It actually interrupts the chain reaction of fire -- a process known as "chain breaking".
The FAR's address the use of halon in AC 20-42C and 25.851
Rick S.
40185
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