Fremantle 1st Car Fire

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written_ficton
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Fremantle 1st Car Fire

Post by written_ficton » Sun Jun 20, 2010 12:18 am

Hi,

http://www.youtube.com/watch?v=ZthT5nwFkJg

Could someone tell me at approx 3:35 the back window shatters, could this be caused by what I believe is the high pressure of the water?
I've closed the door!

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Re: Fremantle 1st Car Fire

Post by Tyranus » Sun Jun 20, 2010 12:40 am

I haven't attended a car fire and so can't give you confirmed answer but it is probably a combination of the pressure and the sudden cooling of the glass. I expect it was more to do with the cooling but the heat may have made the glass soft enough that window would have shattered very easily anyway.
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Re: Fremantle 1st Car Fire

Post by yorky » Sun Jun 20, 2010 12:46 am

Window shatters outwards as well until gravity kicks in. My *guess* is also the pressure from the steam tipping it over the threshold.
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Re: Fremantle 1st Car Fire

Post by Helitak_670 » Sun Jun 20, 2010 6:43 pm

The window shattered because of the heat difference, it was hot and then you put cold water on it and any glass will just shatter like that. I am surprised that there was no BA involved.

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Re: Fremantle 1st Car Fire

Post by Tyranus » Sun Jun 20, 2010 9:29 pm

yorky wrote:Window shatters outwards as well until gravity kicks in. My *guess* is also the pressure from the steam tipping it over the threshold.
Going off what Helitak has said it would probably shatter the other way if you put water on the other side because of the way it cools even if you'd used a hose pipe.
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Re: Fremantle 1st Car Fire

Post by auntys_eyes » Mon Jun 21, 2010 12:44 am

yorky wrote:My *guess* is also the pressure from the steam tipping it over the threshold.
I believe yorky is right on the money. The temperature in the car, after being fully involved for at least 3 1/2 minutes (it is already burning when the video starts), would be tremendous. Given the fact that the window pops within 4 seconds of water being introduced in to the vehicle (not sprayed directly on to the glass) would indicate a sudden pressure increase due steam production. Anyone who has poured/sprayed a significant quantity of water on to a VERY hot fire will have experienced how violent the steam eruption can be.
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Re: Fremantle 1st Car Fire

Post by Tyranus » Mon Jun 21, 2010 1:12 am

I thought the hose had been aimed up at the window? Oh well maybe not, either way too late to watch again, either pressure in the car or a sudden cooling effect could cause the window to shatter.
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