- General Maintenance
Maintain daily pressure drop readings on graph Keep bag location replacement chart Watch for consistent bag failures and retain typical bag for inspection Retain bags that have unusual or noncharacteristic failures Maintain an adequate supply of bags, cages and Diffusers to avoid costly production delays - Daily Maintenance
Check pressure drop across baghouse Check header air pressure Drain header Check air lock for operation and leaks Rap hopper with rubber hammer to avoid bridging and build up Visually inspect stack Check temperature gauges (know bag limitations: temperature) - Weekly Maintenance
Inspect tubesheet for dust accumulation, corrosion and evidence of condensation Visually inspect bags for blinding, leakage and wear. When possible perform Trace-It leak detection test Check timer control for operation and proper pulse sequence and duration Clean pressure gauge taps with compressed air Check foundation bolts, housings and belts on fans and motors Check inlet air flow into baghouse - High Collector Pressure Drop
Possible Cause Solution Malfunction of bag cleaning System Check all cleaning system components Ineffective cleaning Modify cleaning cycle Re-entrainment of dust in collector due to low density material or inleakage at discharge Check discharge valves Lower A/C Ratio Wetting of bags Control dew point excursions
Dry bags with clean air
Clean bags or replaceToo high A/C ratio Verify gas volume - Abnormally Low Pressure Drop
Possible Cause Solution Lines(s) plugged Blow back thru lines
Protect sensing point from dust or water build-up
Incorporate auto-purging system in sensing lines
If copper lines – air purge them yearly – could get moisture trappedManometer line(s) broken or uncoupled Inspect and repair - Stack Emission
Possible Cause Solution Bag permeability increase Test bag
Check cleaning energy/ cycle and reduce if possibleClean to dirty plenum leakage Inspect and repair Change of inlet conditions Test & Review - Puffing Back
Possible Cause Solution High pressure drop across the bag house See “High Collector Pressure Drop” above Low system fan speed Check drive system increase speed Improper duct balancing Rebalance system Plugged duct lines Clean out Poor hood design Evaluate temporary modifications and implement - Low Dust Discharge
Possible Cause Solution Inleakage at discharge points Inspect and repair seals or valves Malfunction of discharge valve, screw conveyor or material transfer equipment Inspect and repair Re-entrainment of dust with in collector Check for leaks at discharge or hopper Retainment of dust on filter bags Increase cleaning - Corrosion
Possible Cause Improper paint material or Application Improper insulation Emission of nearby equipment Dew point excursions Improper shutdowns - Loud or Unusual Noises
Possible Cause Vibrations or banging of moving parts Squealing of belt drives