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@REPLYADDR Joe Gwinn <joegwinn@comcast.net>
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On Thu, 28 Sep 2023 15:55:39 -0700, Bob La Londe <
none@none.com99>
wrote:
>On 9/28/2023 3:19 PM, Joe Gwinn wrote:
>> 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
>
>
>Standing on concrete outside in one of the driest climates on earth. I
>wear rubber sole shoes pretty much all the time. Either sneakers or
>walking boots. The OP usually wears rubber sole shoes as well. I still
>have very good discrete hearing. (I still have my high frequency
>hearing as well.) The only sound I heard was the detonation. Its
>possible, but it sure didn`t seem like it.
The ESD spark and the detonation would likely be too close in time to
be told apart, and the boom is far louder.
Joe Gwinn
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