 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-liter 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.