Fire Onboard Dauntless

Typical f*in Herald "The blaze took hold of HMS Dauntless" but the ship managed to extinguish it and there was a "small amount of fire damage" I swear the Herald is a training camp for journalists destined for the Daily Mail.
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A more measured description from the Pompey News:
Portsmouth News 16 Mar 2011 said:
...A navy spokesman said: ‘On Saturday afternoon a running diesel engine inside an enclosure suffered a split pipe. This resulted in a lot of atomised liquid and steam or smoke within the enclosure.
‘There was no fire but the smoke detectors were activated and we responded initially as if there had been a fire.
‘The in-built CO2 fire suppression system was not operated and it quickly became evident that there was no fire.’
Where there's smoke, there isn't always fire.
Is it not something to do with Montreal/Kyoto CFC reduction too?
Good hit Joe
This from Britannica

halon, chemical compound formerly used in firefighting. A halon may be any of a group of organohalogen compounds containing bromine and fluorine and one or two carbons. The effectiveness of halons in extinguishing fires arises from their action in interrupting chain reactions that propagate the combustion process. Halons are nonconductors of electricity and can be used in fighting fires in flammable liquids and most solid combustible materials, including those in electrical equipment; they are ineffective on fuels containing their own oxidizing agent or highly reactive metals, such as sodium or potassium. Halon 1301 (bromotrifluoromethane) is especially favoured for extinguishing fires involving electronic equipment because it leaves no residue and does not cause electrical short circuits or damaging corrosion of the equipment.
Halons are both atmospheric ozone depleters and greenhouse gases. In accordance with the Montreal Protocol, their manufacture and consumption were phased out in industrialized nations by Jan. 1, 2000.


Lantern Swinger
I know that Halon does have a slight toxicity when it acts on a fire, but does it not displace less oxegen than CO2? Allowing more breathable air, so more time to escape?

I think they stopped making Halon 1301 in 1994, but its still available till its depleated.


War Hero
Its mainly to do with pyrolisation of the chemical compounds, itself a by product of the breaking up of the fire process triangle. The halon used in machinery spaces (BTM1301 - Bromotriflouromethane) is 'breathable' in it's pure form but can cause dizziness and nausea in concentrated amounts and when in contact with fire produces all sorts of fun products, even phosgene derivitives. Module halon (BCF1211 - Bromochlorodiflouromethane) will happily sort you out with a draft chit to Hades when breathed. Still amazes me ships companies have faith in injecting this stuff into modules and expect it to be air and gas tight. I've seen it done for real and its out all over the place. Puts the fires out though.

We've got a Montreal Protocol joker played on it's use - i.e. we can't replace it so ner.

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