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A cyclone ahead of a baghouse is found to be collecting only the coarsest material.

How should this be judged?

  • A.As a sign the cyclone body is too narrow
  • B.As normal: it is there to protect the filter
  • C.As a fault requiring the cyclone to be replaced
  • D.As evidence the baghouse is undersized

Answer: B

Correct answer: As normal: it is there to protect the filter

A cyclone placed ahead of a baghouse is a pre-cleaner, and collecting only the coarse fraction is exactly what it is for: removing the heavy and abrasive material that would wear the bags, and reducing the dust load the filter must cake and clean. Expecting it to collect fine dust would be to misunderstand its role, and its cut diameter of five to ten micrometres makes clear it cannot.

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