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Recently switched to using a grain vac (Kongskilde portable) for loading bins. Using 6 inch pipe up to a elbow then over to a lid mounted cyclone. We use a section of steel flex 90 degrees to connect the vac to the upright pipe on the bins.

Problem: hand on grain with lots of shelled sunflower, broken corn. Had one bin last year that was full of corn meal and flour, not just the cores.

Any idea as to the problem? I thought air handling would be gentler than augers. My son wondered if the steel flex line is the culprit. Could the velocity of the grain be too high ?
 

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It is probably the elbow , the grain is coming in at a high velocity and hits the backside of the elbow and just stops . In a few years you will see grain shooting out a hole in the elbow from the wear . Wouldn't be the flex but it will wear out fairly fast especially if it has any tight bends in it . Would suggest some pre-bent sections of heavier wall pipe . Have found that the vac is easier on sunnies than an auger for emptying bins .
 
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