Notes on dust explosion protection remediation in a feed mill grinding section

The survey found several hazards in the grinding section: the dust collector and silo lacked equipotential bonding, some motors were not explosion-proof, dust clearing intervals were too long, and the bucket elevator had no explosion venting.

The plant had previously taken the view that nothing having happened meant it was safe.

The corrective work was broken down by the three elements of explosion protection: control the concentration - increase cleaning frequency and switch to vacuum cleaning to eliminate secondary dust clouds; control ignition sources - replace non-explosion-proof motors, seal electrical wiring in conduit, and rebuild the grounding system and measure its resistance; control the consequences - fit explosion-venting panels and isolation valves to the bucket elevator and dust collector.

The remediation was completed in five weeks and a dust-area inspection sheet was established, with earthing resistance and cleaning records added to the monthly check.

Dust explosion protection has to be advanced systematically along three lines — concentration, ignition source and consequence. Single-point fixes create a false sense of security.

Accumulated dust is the most underestimated hazard: one disturbance can turn settled dust into an explosive cloud. The cleaning regime matters more than the equipment.

Dust explosion-protection work is a safety red-line project that allows no shortcuts. This case was systematically broken down by the three elements of explosion protection - controlling concentration, controlling ignition sources and controlling consequences - with all three pursued at once, clearing every hazard in five weeks. The work is not a one-off campaign but the building of a lasting mechanism: a dust-area checklist, grounding-resistance readings and cleaning records are folded into the monthly inspection, turning explosion protection from a "crackdown" into "daily management."