Posted by paul on January 16, 2020 at 14:26:25 from (76.77.197.114):
In Reply to: Re: trapped in bin. posted by RLP in Co. on January 15, 2020 at 09:02:19:
A good bin of grain with no grain being taken out at the time is quite safe. Cones up, leveled off, or inverted cone, with nothing being taken out these are very safe to be in.
There are three ways to get trapped in a bin of grain.
1. The grain gets out of condition, wet/ moldy, and forms a crust on top. Some grain is removed from the bottom but the top crust holds together. A person walks out onto the crusty top, and it caves into the cave below.
2. Grain is being removed from the bottom and a person walks out into the bin. The grain being removed is like an hour glass, it swirls the grain down real slowly. But it will suck your feet in if you don’t move and trap you and suck you along down with the grain. You might think you can just keep moving and be fine, and maybe several 100 times that works, but just once, you don’t move for a while or the grain swirls different, and it traps your feet and you can’t get out, it slowly sucks you down. If your knees get covered it is extremely difficult to pull yourself out of moving grain, hard to imagine but it traps you much sooner then you think.
3. A vertical wall of wet or frozen grain forms as they empty the bin. Sort of like the crust in #1 but vertically. The wall gets pretty tall. Someone goes inside and pokes at the wall, it lets loose and slides down and covers you up. A person gets forgetful when you start working on a deal like this, and forgets how bad it would be if the grain falls down flat instead of little chunks coming off.... as well even working through a door from the outside if a wall of grain lets loose big enough it can splash out the door or even bust the sidewall if it whooshes down bad enough. Rare, but it happens.
Safety harness that keeps you hanging from the roof is very helpful, but if you look at #3 especially or the other 2 it isn’t perfect won’t save you in all situations. A side door doesn’t really work on the big bins, not enough grain cones out, fills up on the ground and that’s it. Or it’s too high and then it won’t let enough out either. The rescuers need to make the slit in the right place for that accident; you won’t have 27 safety doors around the bin to help for every possible entrapment. Doors weaken a bin, so they are expensive and problematic to add. Read, costly. It is much cheaper to just work safe.
The safety device is to put a barrel or cone around a person that is trapped in the grain, and then get the grain sucked or dipped out around the person the rescue cone or just plywood or whatever keeps more grain from filling in. You make a little well around the person. If the grain is around the chest, breathing becomes difficult and saving the person is not looking good. You need their chest back out quick, and you need the rest out to keep circulation going. That moving grain likes to pack in real tight and squeeze a person.
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