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Technology Factsheet

Centrifugal Shot Blast

Category: Decontamination > Mechanical Surface Removal > Shot Blasting
Reference # : Model No : 420-E

The centrifugal shot blaster is an electronically operated shot blast machine that has been modified to remove layers of concrete to varying depths. A hardened steel shot propelled at a high rate of speed abrades the surface of the concrete. The rate of speed the machine is travelling and the volume of shot being fired into the blast chamber determine the depth of material removed. The steel shot is recycled and used over until it is pulverized into dust that ends up in the waste container with the concrete being removed. Debris is continuously vacuumed by a large dust collection system attached to the shot blaster. The vacuum system utilizes high efficiency particulate (HEPA) filters. The primary unit consists of a blast head and a vacuum system. Hardened steel shot size S460 is propelled at a high rate of speed from the blast head to abrade the concrete surface. The concrete debris and part of steel shot are collected by the vacuum system and separated. The concrete debris is collected in a dustbin located at the bottom of the machine, while the shot is separated for recycling by the unit. The depth of concrete abraded is determined by the rate of speed of the machine and the volume of the shot fired into the blast chamber. The primary unit is not able to access the edges of walls or corners. The width of the cut was 15 in. The technology was able to reach 8 in.-10 in. from the wall. Dimensions of Tech Model (LxWxH): 7 ft. x 26 in. x 6 ft. Weight of Tech Model (lb.): 2,700

Benefits

Aggressive technology with high production rates. A magnet can be used to collect shot that is not picked up by equipment. The equipment is self-propelled resulting in little operator fatigue. Secondary waste is limited to filters and spent steel shot. Various grades of steel shot can be used, resulting in a change of surface profile and depth of removal. Many units are self-contained, requiring very little set up time.

Limitations

Requires dry debris - free surface. Steel shot can be projectile hazard. The round steel shot is trip hazard. Uneven shot surfaces can cause excessive shot loss. Open surface area equipment can be large and difficult to maneuver. On some units debris handling is a difficult process. High maintenance is required because of the destructive nature of the process.

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