Troubleshooting conveying elbows
| Symptom | Possible contributors | Useful evidence |
|---|---|---|
| Rapid outer-wall wear | Particle impact, velocity, abrasive material, geometry | Wear map, operating hours, tonnes, gas conditions |
| Wear after the bend | Particle reacceleration and downstream impact | Outlet-spool photographs and measurements |
| Excess fines | Particle collisions, route velocity, repeated bends | Before/after particle analysis and route sketch |
| Streamers or smearing | Pellet-wall contact, temperature, resin behavior | Resin grade, pellet temperature, deposits |
| Blockage | Cohesion, moisture, oversize, retained material | Feed variability and pressure trend |
| Cross-contamination | Residual product in pockets, joints or route | Cleaning sequence and residue sampling |
| Flange leakage | Fit, gasket, loading or assembly issue | Drawing, connection and support inspection |
These are investigation paths, not diagnoses. Review changes in feed and operation before assuming the elbow alone is responsible.