TL;DR
Any smoke, heat, or scorch marks on a dust collector handling combustible material is an emergency. Stop the unit, evacuate the area, and follow your facility fire response plan before investigating.
What you might see
- smoldering dust or smoke visible at exhaust
- heat or scorch marks on filter media
- spark detector alarm on inlet duct
- visible dust accumulation on collector exterior
Likely causes
Combustible dust accumulation inside the collector without adequate housekeeping or discharge
Sparks or embers from upstream grinding or cutting operations entering the duct
Missing or bypassed spark arrestor on the inlet duct
Inadequate grounding or bonding allowing static discharge inside the collector
Required tools
- Multimeter or continuity tester (for grounding verification)
- Camera (for documentation)
- LOTO kit
- Supplied-air respirator or SCBA (for post-fire inspection)
- Replacement explosion vent panels (if actuated)
Safety first
- Do not open the collector housing if there is any indication of fire inside. A smoldering dust pile can flash to an explosion when exposed to air.
- Follow NFPA 652, NFPA 654, and your facility combustible dust management plan for all maintenance activities on this collector.
- All personnel must evacuate the area immediately when a fire or explosion indication is present. Call your fire response team first.
Procedure
- 1
If you observe smoke, flames, or unusual heat from the collector: activate the Emergency Stop, alert the area, and follow your facility fire response plan. Do not open the collector housing.
Warning: Combustible dust fires can transition to an explosion when disturbed. Do not open the collector if there is any indication of fire inside. - 2
After the area is secured and any fire is confirmed out, lock out the fan, pulse jet, and all inlet and outlet dampers.
- 3
Inspect the inlet spark arrestor or spark detection system for correct operation. Test the spark detector sensor per manufacturer instructions.[1]
- 4
Inspect all collector housing panels, hopper, and clean-air plenum for scorch marks. Photograph all damage for the fire investigation and insurance records.
- 5
Verify the electrical grounding and bonding connections on the collector housing, ductwork, and hopper are intact and continuity is below 1 ohm to earth.[1]
- 6
Inspect the explosion relief vents (if installed) for damage or actuated vent panels. Replace any actuated or damaged panels before restarting.
- 7
Review the dust accumulation on the exterior of the collector and all horizontal duct surfaces. External dust accumulation above 1/32 inch is a housekeeping failure requiring immediate cleanup.
- 8
Before restarting, conduct a formal hazard review with maintenance and safety to confirm the ignition source has been identified and controlled.
Sources
Donaldson Torit Downflo Evolution Cartridge Dust Collector Installation and Operation Manual, Donaldson Torit
Donaldson Torit DFO Dust Collector Installation, Operation and Maintenance Manual, safety, grounding, and explosion protection procedures (general)
View source
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