Tuesday, March 7, 2017

Steel Grain Bins: vs. Concrete Silos

G3 photo from manitobacooperator from a posting
A rendering of what G3’s proposed Vancouver grain terminal on the north shore of Burrard Inlet, will look like, if the project goes ahead.
Since all of the big grain elevators I have seen have added steel bins to their concrete silo core, I had assumed that steel bins have made slip-form concrete silos obsolete. But I see that for green-field construction of big elevators, concrete silos are still preferred. (Steel Grain Bin Construction)

I wonder how strong a tornado is needed to destroy an elevator made with concrete. (I assume the slip form silos used reinforcement bars.) On the other hand, concrete silos with head houses can be damaged by grain dust explosions.

Pathway Family Farms posted two photos with the comment: "Thank you to everyone for your support and prayers following the tornado. We are working on plans to rebuild our grain bin system."
Christopher Vermillion We had something similar happen to us on the farm last March. Completely destroyed our half million bushel grain setup including 3 legs, 7 bins, our overheads, the roof on our machine shed and damaged our farm shop.
Travis Bahan I had an insurance agent once ask me what are the odds of loosing all my bins at once 😳😳😳
[Another comment raised the issue of how much corn got blown away after the bins were compromised. It is interesting to note that the liquid storage tanks look intact. Of course, the contents might be much more toxic than corn so they are probably made stronger. It looks like the big bin may have protected the dryer. I hope the bin tops did not cause damage somewhere else. Fortunately, there is a lot of fields downwind of here for the steel to safely fall back to earth.]

And that was a recently built complex! Bing's satellite view shows a bare field.

Google's 2012 street views have just the leg, dryer, one supplement bin and one corn bin. There are no liquid storage tanks.
Google's satellite view looks recent.
Sue Lani Madsen / The Spokesman-Review
"Sue Lani Madsen, a freelance columnist with The Spokesman-Review, said trains were slowing to a crawl as they passed through Edwall, likely out of concern of the next bin over that was hit top and bottom in the collapse."
[The track that is bent is a siding. The mainline track is OK. The article does not mention a storm or high winds.]
KFGO 790 AM posted
South of Breckenridge...aerial views of storm damage at the grain elevator in Tenney, Minn.
Doug Ellingson The cement one is still standing you get what you pay for
[But so are the steel bins next to them.  It think it is more a demonstration of how fickle tornado winds can be. Note that the bins appear to be about 7/8 empty. That would be about right for June.  Satellite. This town used to have three streets of houses. Now it has almost no houses. A vivid illustration of how big tractors and combines can devastate the population of rural towns.]
[KFGO news article. The fall protector indicates it is still rail served and the article indicates it is CP track.]

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