While in BLAST mode, with the blast control switch engaged, air is flowing from the nozzle but little or no abrasive is flowing from the nozzle

  • Fill the water tank with fresh water only, then open the inlet ball valve.
  • Close the rinse ball valve and abrasive ball valve.  Close the water dose meter if equipped.
  • Turn the selector valve to OFF.
  • Disengage the Emergency Stop.
    • The water pump will not work unless the Emergency Stop is disengaged.
  • Align the pop-up handle with the pin slot, and then firmly push and turn the handle 90 degrees after the pin is below the bracket slot.  Proper engagement of the pin will hold the pop-up down until it is released.
  • Open the pot dump valve.
  • Add 10 gallons (30 liters) of fresh water to the pot.  Add abrasive material (see technical specifications in manual for capacity information).
  • Close the pot dump valve.
  • Use a garden hose or the rinse hose to wash the abrasive into the pot and clear any abrasive from the pop-up and gasket,
    • Make sure 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.
  • Enagage the blast control switch and set the blast air pressure to a maximum of 175 psi (12.06 Bar, 1.26 MPa).
  • Open the abrasive ball valve.

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.
  • Engage the blast control switch and check for actuation of the pinch valve.  If there is no actuation, disconnect the orange tubing at the pinch valve.
    • If the pinch valve opens and source air is coming from the orange tubing, confirm the tubing is correctly routed.
    • If the pinch valve does not open, replace it.
    • If the pinch valve opens and there is no source air coming from the tubing, inspect mufflers on the 4-way valve for debris.
    • If debris is not present, clean or replace the 4-way valve.
  • 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.
  • With the blast control disengaged, allow the pot to pressurize and wait for the pump to stall.  If the pot pressure gauge does not reach 185 psi (12.75 Bar, 1.275 MPa) see the "Unable to fill or pressurize the pot with water" problem listed above.
  • If the blast pressure gauge reads 160 psi (11.03 Bar, 1.103 MPa) or greater, it may not be possible to achieve greater than 15 CPM on the MediaTrak.  This is more common with fine mesh abrasive usage.  Decrease the blast pressure to 100 psi (6.9 Bar, 0.69 MPa) to see if CPM can be increased.