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Old 05-03-2019, 08:41 PM
 
Location: Madison, Alabama
3,217 posts, read 1,504,096 times
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Quote:
Originally Posted by fisheye View Post
From what I have seen and asked about; wetting logs has more to do with three different factors: It prevents the logs from splitting, it acts as an insecticide, and it makes the logs easier to cut: Why Would you wet down logs in Sawmills and Milling.

I think one issue that has not been addressed with spontaneous combustion is the outside temperature. For a fire you need three elements: heat, oxygen and some ignition source. The deep South has experienced very high temperatures and when combined with the heat of decomposition; could cross that line of an ignition source.
Yeah, Fish, you may be right about the reason to water down a log pile. I'm virtually certain I've seen the piles smoking though.

I suspect that the low humidity and hot temperatures of the desert southwest might cause a sawdust pile to fairly readily combust, but deep South temps aren't all that high ... it's the darn humidity that makes things so uncomfortable.
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Old 05-03-2019, 08:46 PM
 
Location: Madison, Alabama
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Quote:
Originally Posted by fisheye View Post
I was running two Carter AFB's on top of a V-8 in a 55 Chevy and blew a fuel line. Have you ever smelled boiling gasoline? I don't know why it didn't explode. I shut it down and carefully opened the hood. There was a lake of boiling fuel on the intake manifold. I was surprised the distributer did not touch it off - just lucky.
I'm not going to throw a lit match in a can of gasoline, but it needs to be in a vapor form to combust, along with adequate oxygen of course. You'd think there would have been plenty of combustible vapors with a blown fuel line however, so maybe you were just lucky.
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Old 05-03-2019, 09:08 PM
 
Location: Swiftwater, PA
14,225 posts, read 11,454,064 times
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Quote:
Originally Posted by RocketDawg View Post
Yeah, Fish, you may be right about the reason to water down a log pile. I'm virtually certain I've seen the piles smoking though.

I suspect that the low humidity and hot temperatures of the desert southwest might cause a sawdust pile to fairly readily combust, but deep South temps aren't all that high ... it's the darn humidity that makes things so uncomfortable.
The Southwest was looking at temperatures above 110 degrees Fahrenheit last summer. When you add the heat absorbed by the darker colors and decomposing compost; it could be considerably hotter. Then the spark that ignites could come from the static discharge from a dust storm/sand storm, dust devil, or even an earthquake.
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Old 05-03-2019, 11:02 PM
 
4,041 posts, read 7,653,672 times
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A fire can be started with a magnifying glass. So if temperature reaches that high (without the magnifying glass), I guess stuff can ignite and burn.
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Old Yesterday, 04:51 AM
 
Location: Swiftwater, PA
14,225 posts, read 11,454,064 times
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Originally Posted by davidt1 View Post
A fire can be started with a magnifying glass. So if temperature reaches that high (without the magnifying glass), I guess stuff can ignite and burn.
It could even be broken glass or clear liquid in a clear bottle. Once there is no moisture and the right weather conditions anything is possible. Here is a video on how to start a fire with a sandwich bag; think of how much litter (both glass and plastic) is collecting rain water and could possibly act as a magnifying glass:


https://www.youtube.com/watch?v=vMcgs7Tx3Hs
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Old Yesterday, 06:41 PM
 
Location: Brooklyn,NY
10,557 posts, read 12,971,390 times
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Quote:
Originally Posted by fisheye View Post
It could even be broken glass or clear liquid in a clear bottle. Once there is no moisture and the right weather conditions anything is possible. Here is a video on how to start a fire with a sandwich bag; think of how much litter (both glass and plastic) is collecting rain water and could possibly act as a magnifying glass:


https://www.youtube.com/watch?v=vMcgs7Tx3Hs
I second this. A shiny reflective surface focusing sunlight is all it takes. There is a hotel Las Vegas that had a reflective surface that singed hair, drinks and beach chairs that's an example of this.
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Old Today, 05:03 AM
 
Location: Swiftwater, PA
14,225 posts, read 11,454,064 times
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Quote:
Originally Posted by D. Scott View Post
I second this. A shiny reflective surface focusing sunlight is all it takes. There is a hotel Las Vegas that had a reflective surface that singed hair, drinks and beach chairs that's an example of this.
That hotel is not the only one:


https://www.youtube.com/watch?v=oxHCe5EymPg
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