Wet abrasive blasting unit

An abrasive media blasting system, comprising:

• an abrasive media container comprising an interior bottom surface and an abrasive delivery tube disposed within said abrasive media container, said abrasive delivery tube having an open bottom end positioned at fixed operative distance above said interior bottom surface, and a discharge end positioned outside of said container;
• a variable pressure gas source connected to said abrasive media container, so as to pressurize said abrasive media container with gas, and a first controller controlling said pressure of said variable pressure gas source;
• a variable pressure air supply line comprising an air supply valve and a second controller for controlling flow and pressure of air flowing through said variable pressure air supply line;
• an abrasive metering/shutoff valve connected to said discharge end of said abrasive delivery tube and to said variable pressure air supply line downstream of said air supply valve, said abrasive metering/shutoff valve controlling a flow rate of an abrasive media from said abrasive media container and permitting the mixing of said abrasive media flow from said abrasive delivery tube and said variable pressure air supply line at desired respective rates;
• whereby upon activation of said second controller and activation of said abrasive metering/shutoff valve, gas pressure within said container forces an abrasive media slurry disposed within said container downward within said container, through said open bottom end of said delivery tube, and upward through said delivery tube and out said discharge end thereof, and
• whereby the gas pressure within said container, the pressure of said pressurized air supply line, and the rate of flow of said abrasive media may be independently controlled so as to yield an abrasive discharge stream having a desired pressure and flowrate.