Operational Failure Overview
In high-production blasting, a plugged nozzle is the primary cause of unbilled downtime. Clogging occurs when the technical balance between abrasive media, compressed air, and the nozzle orifice is disrupted. This failure is rarely the fault of the nozzle itself, but rather a symptom of upstream contamination or equipment mismatch.
Nozzle Flow Failure Matrix
| Symptom | Technical Cause | Remedy |
|---|---|---|
| Sudden Blockage | Oversized debris / Rocks | Sieve abrasive / Clean Pot |
| Intermittent Pulsing | Moisture in media | Install Moisture Separator |
| Reduced Flow | Worn Metering Valve | Inspect/Replace Valve Sleeve |
| Pressure Surge | Wet abrasive clump | Dry air supply / Drain Tank |
The Moisture Factor
Moisture is the #1 cause of clogs. When water vapor from the compressor reaches the abrasive, it creates a technical "damp-clump" at the metering valve. Using an **APEX Moisture Separator** at the pot inlet is the only way to ensure 100% dry abrasive flow.
Garnet Grading Logic
Industrial media like **Garnet** must be precision-screened. If the mesh size contains oversized particles (overs), they will bridge at the nozzle entrance, causing a hard plug that requires immediate shutdown and manual clearance.
Daily Preventive Sequence
- Sieve Abrasive: Always use a screen on the pot during refill.
- Drain Moisture: Purge air lines and moisture separators hourly.
- Valve Check: Verify metering valve responsiveness before each shift.