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Old 08 June 2009, 09:42   #11
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?
Spraying CO2 onto red hot metal causes it to cool extremly rapidly this it will contract and can splinter sending sharrs of metal splitting off.

All comes from my RAF days with aircraft coming in with brake fires... funny what you remember from years ago.
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Old 08 June 2009, 14:27   #12
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Spraying CO2 onto red hot metal causes it to cool extremly rapidly this it will contract and can splinter sending sharrs of metal splitting off.

All comes from my RAF days with aircraft coming in with brake fires... funny what you remember from years ago.
That is also true but the main worry with aircraft fires is that the CO2 can break down in contact with a magnesium alloy fire to produce oxygen which isn't a very good idea!!!
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Old 08 June 2009, 15:16   #13
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Spraying CO2 onto red hot metal causes it to cool extremly rapidly this it will contract and can splinter sending sharrs of metal splitting off.

All comes from my RAF days with aircraft coming in with brake fires... funny what you remember from years ago.
Bazza - I am sure you are right - but its not a risk I have ever heard anyone mention about boat or car engine fires in the past so either its a risk we don't appreciate, or there is a subtle difference - like the temperature difference not being high enough. Certainly with boat engines its hard enough to get the CO2 where you need it - never mind get enough close enough to the "nozzle" that you would be getting much very cold.

Codprawn - you never cease to amaze me. I'm perfectly aware that Mg reacts with CO2 if it is hot enough, but since there is not much magnesium on my boat (given it doesn't really like water!) that isn't a major concern.
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Old 08 June 2009, 15:29   #14
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Bazza - I am sure you are right - but its not a risk I have ever heard anyone mention about boat or car engine fires in the past so either its a risk we don't appreciate, or there is a subtle difference - like the temperature difference not being high enough. Certainly with boat engines its hard enough to get the CO2 where you need it - never mind get enough close enough to the "nozzle" that you would be getting much very cold.

Codprawn - you never cease to amaze me. I'm perfectly aware that Mg reacts with CO2 if it is hot enough, but since there is not much magnesium on my boat (given it doesn't really like water!) that isn't a major concern.
Check your anodes!!!

Seriously though you posted a ? So I assumed you were asking why!!!
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Old 08 June 2009, 15:35   #15
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Check your anodes!!!
eh - not likely to be on fire - and mine are zinc!
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Seriously though you posted a ? So I assumed you were asking why!!!
I was - but an explanation about reactive metal fires was irrelevant
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Old 08 June 2009, 15:38   #16
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eh - not likely to be on fire - and mine are zinc!
I was - but an explanation about reactive metal fires was irrelevant
Haven't you heard of the sudden rise in spontaneous combustion of anodes? Seems to be happening a lot - especially in North Wales boat yards...........
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Old 08 June 2009, 16:08   #17
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Haven't you heard of the sudden rise in spontaneous combustion of anodes? Seems to be happening a lot - especially in North Wales boat yards...........
another ?
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Old 08 June 2009, 16:25   #18
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Halfords do a great line in Fire Extinguishers that may be suitable Neil, and probably cheaper than your average boat supplier

How about this one.... ?

http://www.halfords.com/webapp/wcs/s...egoryId_165536
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Old 08 June 2009, 18:02   #19
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Yes but that is still powder.

http://cgi.ebay.co.uk/2Ltr-FOAM-AFFF...3%3A1|294%3A50

http://cgi.ebay.co.uk/Fire-Extinguis...3%3A1|294%3A50

These 2L foam ones are under 30.

Also Tesco sell a very useful looking all aluminium mini foam fire extinguishers for chip pan fires etc. It is a sealant type foam that forms a chemical skin - could be very useful for a boat fire and they only cost 9.95 - I bought 4 of them.

http://www.fireangel.co.uk/Other/Products/FE-909.aspx

and some tech info

http://www.fireangeldirect.co.uk/pag...E-909&jssCart=
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Old 08 June 2009, 18:29   #20
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Why would you have to create a port to fire a CO2 extinguisher into, whats wrong with the air intake.

As I said in another thread the Atlantics have one CO2 extinguisher. We are trained in the event of an engine fire to isolate the fuel, then fire the CO2 into the air intake till the engine stops, it only takes a few seconds.
This causes no damage to the engine.
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