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@REPLYADDR Joe Gwinn <joegwinn@comcast.net>
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On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <
none@none.com99>
wrote:
>On 9/27/2023 1:05 PM, Leon Fisk wrote:
>> Hi,
>>
>> Interesting news article on the power of leaking acetylene?
>>
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1
-damages-vehicles.html
>>
>> ===
>> OTTAWA COUNTY, MI ? Police believe a leaking cutting torch stored in a
>> vehicle?s trunk caused an explosion early Wednesday morning.
>>
>> A 21-year-old Allendale woman suffered minor injuries and two cars were
>> damaged as a result of the blast, Ottawa County sheriff?s deputies said.
>>
>> Allendale Township firefighters and deputies responded to a 6:30 a.m.
>> report of an explosion Wednesday near 68th Avenue and Sunset Drive in
>> Allendale.
>>
>> Police said a leaking acetylene torch was stored in the trunk of a car
>> overnight. Investigators determined the explosion was triggered either
>> when the electric release was used or when the trunk was opened.
>>
>> There was also damage reported to the garage?s structure.
>
>
>I have been told more than a certain volume of acetylene in "free air"
>can self detonate or detonate from turbulence. I had an accident here
>at the shop some years back where there was no apparent source of
>ignition. Just somebody in open air sticking their hand in front of the
>flow the flow from a cracked valve. There was no physical contact, and
>no obvious source for static. I mentioned it in this group not long
>after it happened. Gunner and a few others told me there had to be an
>ignition source, but I was standing right there. In fact I was reaching
>towards the valve to shut it off when it ignited. Then we had a blow
>torch pointed at the corner of my shop building. I went back in the
>shop to grab a welding glove so I could shut it off.
>
>The person with their hand in front of the valve got burned, but not as
>badly as you might think. Their whole hand was red, and the outer
>layers of skin all sloughed off over the next few days. They got their
>hand out of the fire pretty quick. Worse than a regular first degree
>burn, but not the worst burn I`ve seen called a second degree burn. It
>was mostly bad because it was over their whole hand.
>
>We could argue about whether it was an explosion or a conflagration. It
>had a pretty healthy pop for an uncontained event. Faster than a
>whoomp, but maybe not quite a crack.
What was the humidity then?
I`d bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to
make a sharp crack sound.
Joe Gwinn
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