TL;DR
A dust cloud around the packer means the dedusting filter is saturated or the duct is blocked. Check the bag filter differential pressure and trigger a manual pulse-jet cleaning cycle.
What you might see
- visible dust cloud around the packer
- dedusting fan pressure drop below normal
- bag filter differential pressure high alarm
- reduced suction at the packing spouts
Likely causes
Bag filter elements saturated, requiring a manual cleaning or replacement
Dedusting duct partially blocked with hardened cement reducing airflow
Pulse-jet cleaning solenoid valve failed, preventing filter regeneration
Fan belt slipping or broken reducing extraction volume
Required tools
- Replacement bag filter elements
- Duct inspection tools
- LOTO kit
Safety first
- Cement dust is a respiratory hazard and an explosion risk in confined duct spaces. Wear P100 respiratory protection and no ignition sources.
- Lock out the dedusting fan before opening any duct or filter housing.
Procedure
- 1
Read the bag filter differential pressure from the indicator. High differential confirms filter saturation.[1]
- 2
Trigger a manual pulse-jet cleaning cycle from the control panel. Observe the differential pressure drop after each pulse.[1]
- 3
If differential pressure does not recover after several cleaning cycles, lock out the packer and dedusting system for filter inspection.
- 4
Open the bag filter access panel and inspect the filter bags for blinding (paste coating) or physical damage.
- 5
Replace saturated or damaged filter bags with bags of the correct micron rating.
- 6
Inspect the dedusting duct from the packer to the filter for blockages. Remove any hardened cement from the duct interior.
- 7
Check the dedusting fan belt tension and condition. Replace a worn or broken belt.
- 8
After repair, confirm the differential pressure is within the normal range before restarting the packer.
Sources
Haver & Boecker Haver Roto-Packer ROTO Cement Bagging Machine general technical documentation, Haver & Boecker
Haver & Boecker packing machine dedusting system maintenance documentation (general)
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