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Re: Tennessee Train Derailment: 5,000 Residents Evacuated From Maryville

By: Cactus Flower in ALEA | Recommend this post (0)
Thu, 02 Jul 15 8:14 PM | 140 view(s)
Boardmark this board | The Trust Matrix 		Msg. 17096 of 54959
(This msg. is a reply to 17094 by Down And Out Man)
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Hi D&O,

When the issue is only toxicity, they tend to extend the perimeter downwind. They should do that, I agree.

But Acrylonitrile also has the capacity to polymerize explosively when exposed to heat. Its flash point is only 30°F. I imagine they don't want folks to panic. I believe this is why they have extended the perimeter for a mile in all directions.

The recommended perimeter for a spill (rather than a fire) for this material is only 150 feet.


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The above is a reply to the following message:
Re: Tennessee Train Derailment: 5,000 Residents Evacuated From Maryville
By: Down And Out Man in ALEA
Thu, 02 Jul 15 7:57 PM 		Msg. 17094 of 54959 

I think they must fear a big explosion rather than just a fire.

The large evac area would seem to me to be more based on toxicity/inhalation health concerns than explosion.

This is not one of the chemicals I worked with in my previous life, and I don't know a lot about it. Nor have I seen much info on the configuration of the fire site. I wonder if they have much concern about a BLEVE.

D&O

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