Improper Maintenance

130.jpg (27344 bytes) This image shows a "fishtail" transition conveying exhaust air from at hood. The exhaust duct is disconnected at a flanged connection point.

Small leaks in exhaust ducts compromise the efficacy of individual hoods and many such small leaks can compromise the entire exhaust system.

109.jpg (26684 bytes) This image shows a disconnected duct exhausting a screen.
153.jpg (19360 bytes) This   image shows an erosion hole in an exhaust duct that provide local source capture of particulate.

Ducts should be inspected regularly for defects, and all defects should be promptly repaired.

79.jpg (33566 bytes) This image indicates where return belt rollers have acted as belt scrapers and process materials have unintentionally collected underneath the conveyor belt.

If upstream conveyor belt scrapers were adjusted properly, these dust piles would not exist.

137.jpg (24679 bytes) This shows process materials unintentionally collecting underneath a cage mill and its conveyor belt.

If local source capture hoods for the mill and belt were working properly, these dust piles would not exist.

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