Abrasive blasting is the operation of forcibly propelling a stream of abrasive
material against a surface under high pressure to smooth a rough surface,
roughen a smooth surface, shape a surface, or remove surface contaminants. A pressurized fluid, typically air, or a centrifugal wheel is used to propel the  blasting material. Air blasters do not need any specific air supply. Available plant air is enough with a minimum of $ bar air pressure (60 psi or 400 kPa), although 5 to
6 bar are preferred for better results (75 to 90 psi). The average air consumption is moderate, and depends on the number of firings per hour, size of the pressure vessel, and number of air cannons installed. For instance, a 50-litre air cannon consumes 0.60 Nm3/hour at 6 bar air pressure (90 psi or 600 KPA).With 2 firings per hour.

The compressed air contained in the pressure vessel is instantly released, and the
achieved blast, called the impact force, evacuates material sticking to the walls (rat
holing), as well as breaking potential bridging thanks to the shock wave obtained.

The blasts are usually organized by using an automatic sequencer .

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