During my time on the fire department I have had the opportunity to wee the after math of far too many house explosion just like this on. If you go back to you fire science class you should know about vapor density. You can usually tell what type of gas caused this type of incident to happen. Another give away is location, scene survey etc. again a time fro size up. Propane, as is this case is heavy so the bottom blows out. Natural gas is light and the whole building goes or I have even seen it lift a house up off it's foundation. Had one that blew the first floor out and dropped the second story onto the foundation with two guys in the basement. Have seen where it totally disinigrated the building this this one. I would say that this guy was lucky to get out of this alive.
Here is the report from Kare 11 News - A man was taken to the hospital Wednesday afternoon after a building explosion in Elk River.
The victim was working in a building near the intersection of County Road 13 and County Road 33.
The Elk River Police Chief said the victim turned on a mitre saw which somehow ignited a 500-pound propane tank.
Full Story: http://www.kare11.com/news/news_article.aspx?storyid=541188&catid=2
http://www.msnbc.msn.com/id/29519943/
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