The giant sand blaster is used for cleaning steel trusses before they are taken to be dip-painted. Huge bridge cranes trolley the trusses through the plant as they are assembled. When complete they end up here in preparation for painting.
The seams are masked off before the sealant is applied. This kind of attention adds a small amount of time, but produces a product that is visibly cleaner. The sealant could be applied without the masking. If hidden from view this might be appropriate. When in clear view, like this system is, our quality shows.
This 16" round, 16 gauge stack, is where the first three branches of the sand blaster group together. A 7" round goes in the top, then a 4" round on the side, then the main 12" round goes into the side. The trunk routes down through the pit below the blaster and up the other side to gather in an additional 7" round and 4" round before heading out to the cyclone.