Use blue light scanning to repair a fan
During maintenance work on an exhaust fan that removes saturated sulphuric acid gases from the production process of a metallurgical company, a metal construction felt during sandblasting on the impeller of the same impeller.
Interest in how we solved this?
After a visual and a run out inspection, we started a non-destructive crack test. The shaft, coupling and bearing locations showed no concentricity (run out) problems. However, the impeller sides of the fan were severely deformed in several places.
By scanning the impeller completely with blue light, we were able to determine very accurately where and how much distortion we were dealing with. By processing this information, we were able to draw up a plan to get the fan back in shape. Afterwards, we carried out a final check and scanned the impeller again. This was done to perform a flow simulation afterwards if necessary.
By means of jigs and hydraulic tools, the bent sides are straightened. Afterwards, a non-destructive crack test was carried out.
Furthermore, the impeller was statically balanced, bearings were replaced and a balancing check was carried out on site. Ready for production. By fully scanning the impeller during the maintenance work, there is now the possibility of using reverse engineering to create a spare impeller.