Had something similar happen where I worked. Maint tech came to me stating that a large 6' diameter axial flow fan was vibrating badly and shaking the structure. I ran out there with him and it was running smooth as silk, and was about ready to tear into him a little when I noticed fan blades impaled into the ground, the side of a building and some time later found two blades on the roof of an adjacent building! I was so glad that he came to get me when he did, and not stood there and continue to watch !
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Jimmy M
68 GTO
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