DEKRA Process Safety

A Filter/Receiver Dust Explosion

filter/receiver dust explosion

A filter/receiver directly connected to a powder milling operation exploded giving rise to an indoor deflagration, which, fuelled by powder deposits, propagated into three floors of the building. Fortunately no one was injured, however, the filter/receiver was destroyed by the explosion and several other pieces of equipment were damaged by fire. Windows were blown into a courtyard from three floors of the building. A deflagration in the courtyard caused damage to several building windows.

A mill bearing failure caused overheating of the powder and creation of embers, which entered the filter/receiver and initiated a primary dust/air explosion. Dust build up in the explosion relief discharge ductwork caused delayed activation of the relief door and over pressurization of the filter/receiver. Poor housekeeping had allowed significant dust build up on floors and overhead surfaces.

The root cause of this incident was "less-than-adequate recognition of dust explosion hazards (e.g. inadequate DSEAR/ATEX Assessment)" including:

  • Less than adequate training and awareness to key staff (Training)
  • Less than adequate housekeeping (Management Systems)
  • Less than adequate preventive maintenance of rotating equipment (Mechanical Integrity)
  • Less than adequate monitoring of powder mills e.g. bearing temperature or vibration monitoring (such requirements should be determined from a detailed DSEAR/ATEX Assessment)
  • Less than adequate explosion relief system and its maintenance (Mechanical Integrity and failing to use appropriate design standards)

How can DEKRA Process Safety help you?

For further information on how we can help you in these areas, please contact us on 023 8076 0722 or email us.