Observations: Customer stated that dust collector has been blowing dust back into the building.
Inspection Results: The inspection reviewed the dust collector cartridge filters to determine the cause of the issue.
Staining is noted on top of the filter cartridges seeming to be a result of water leakage from the top of the dust collector. The dust collector has six explosion vents on the top consisting of a rubber membrane and a perforated metal grate. Air appeared to be penetrating the vent panel membrane. Also noted, half of the filter cartridges were replaced while the other half need replacement. It is recommend that all filters be replaced at the same time for longer filter life.
Duct Modification: Gulftech provided services for modifying the return air system with a sheet metal closure of the make-up air. Also recommended was turning and routing the dust collector exhaust system 45 degrees with a 90-degree elbow and Bird screen so that the dust collector exhaust will face away from the building. This action prevents dust from returning back into the building. Pulse valve diaphragms and solenoids were replaced, compressed air pressure is adjusted to recommended 90 PSI.
Observation (Explosion Vent Damage): Inspection of the explosion vents on top of the dust collector was completed and it was determined that the weather domes on top of the explosion vents were damaged, several having large holes allowing rain and debris to enter. The protective membrane is open to the environment on several, allowing water to collect and settle inside the explosion vent. This was likely the cause of the water damage on the filter cartridges.
The explosion vent frame has also been corroded to the point that it is compromised, and was also likely admitting rain into the dust collector enclosure. The water that is allowed into the system was likely collecting in the screw conveyor system, reducing the effectiveness and increasing ware on the invader system.
Recommendation: Replace the explosion vents.