The blast spray pattern is sputtering or irregular.

  • Make sure the air compressor is capable of supplying the minimum air flow requirement for your system (see technical specifications in the manual).
  • Make sure the air inlet pressure gauge reads 100-175 psi (6.8-12 Bar, 0.68-1.2 MPa).
  • If the gauge does not read 100-175 psi, check the air compressor for proper setup.
  • Make sure the air inlet filters are clean, and replace if necessary.
  • When you have finished blasting, perform wash until all of the abrasive is flushed from the blast hose.
  • Turn the selector valve to OFF, and with the abrasive ball valve closed, continue to blast until water is cleared from the hose.  This is to dry the inside of the hose for storage.
  • Perform the pressure relief procedure in the manual.

Outlined in manual 3A3489

  • The optimal set point of the abrasive metering valve and corresponding MediaTrak CPM value varies significantly depending on application and user desired performance. The General Application Guides in the manual describe the generally accepted range of CPM set points based on the substrate and blast pressure set point. The grey highlighted area illustrates the typical range of blast pressure set points and their corresponding CPM set points for that substrate.
  • To find the recommended CPM set point, select the table that most closely matches the substrate that is to be blasted. Determine the blast pressure set point based on the media that is being used, and the desired surface profile to be achieved. Then, use the corresponding lines on the chart to select the appropriate CPM set point.
  • For inexperienced users, select a blast pressure near the low end of the highlighted range. Increase blast pressure and CPM until the desired profile and removal rate are achieved.
  • Close the abrasive ball valve.
  • Turn the selector valve to OFF.
  • Open the pot dump valve to drain water from the pot.
    • Be prepared to capture the water that will be drained from the pot.  All disposals must comply with national, state and local regulations.
  • Engage the pop-up pin by compressing the spring and turning the handle 90 degrees to hold the pop-up in the open position.
  • Add the abrasive (see technical specifications in the manual for capacity information).
  • Close the pot dump valve.
  • Use a garden hose or the rinse hose to wash the abrasive into the put and clear any abrasive from the pop-up and gasket.
    • Make sure the water is above the pop-up seal and the pop-up seal is closed.  Failure to do so before pressurizing the pot can result in serious injury to the operator.
  • When the water level is above the pop-up gasket, rotate the handle to release the pop-up pin.
  • Turn the selector valve to BLAST.
  • Engage the blast control switch and set the blast air pressure to a maximum of 175 psi (12.06 Bar, 1.206 MPa).
  • Open the abrasive ball valve.
  • Remove the nozzle and inspect for blockage, buildup or damage.
  • Replace if necessary.
  • Verify size of nozzle is not too small for application.
  • Follow the draining the pot procedure, followed by the pressure relief procedure outlined in the manual.
  • With the abrasive hose disconnected, inspect the interior of the pinch hose for obstructions or debris and replace if necessary.
  • Remove the tri-clamp from the bottom of the pot.  Inspect the bottom of the pot and the abrasive hose for obstructions or debris.