Dust Explosion Info
Dust Explosion Info is an information centre for
Engineers, Safety Professionals and anyone
involved with the potential hazard of dust
explosions. The website is an excellent starting
point for those wanting to know more about
explosions; the physical characteristics of a dust
explosion, the necessary conditions for an
explosion to occur, potential ignition sources, dust
explosion statistics, dust explosion prevention and
dust explosion protection. Links to further
information, books and design standards are
provided to assist in a greater understanding of the
subject and describe the simple measures that can
be put in place to reduce the risk to factory
workers.
Imperial Sugar Dust Explosion,
2008
The dust of many materials in everyday use such
as coal, wood, cork, grain, starch, sugar, certain
metals, some dyes and intermediates, and many
plastics, can form explosive dust clouds.
Explosions of such clouds have caused some of
the worst industrial accidents.
On February 7, 2008, a huge explosion and fire
occurred at the Imperial Sugar refinery northwest
of Savannah, USA, killing 14 and injuring 38 others
(see picture below). Although the exact cause of
ignition is unknown, the explosion started in a
conveyor running underneath sugar silos. The
primary explosion raised sugar dust that had
accumulated on the floors and elevated horizontal
surfaces, propagating more dust explosions
through the buildings. Secondary dust explosions
occurred throughout the packing buildings, parts of
the refinery, and the bulk sugar loading buildings.
The pressure waves from the explosions heaved
thick concrete floors and collapsed brick walls,
blocking stairwell and other exit routes. The
resulting fires destroyed the packing buildings,
silos, palletizer building and heavily damaged parts
of the refinery and bulk sugar loading area.
Most countries have laws that require the
occupiers of factories to take steps to prevent and
to restrict the spread of dust explosions. For nearly
20 years, European Directive 99/92/EC (also known
as ‘ATEX 137’ or the 'ATEX Workplace Directive’)
has set out minimum requirements for improving
the health and safety protection of workers
potentially at risk from explosive atmospheres. The
text of the ATEX directive may be found here ATEX
137.
Hazardous Area
Classification
Hazardous area classification should
be carried out as an integral part of
risk assessment to identify places (or
areas) where controls over ignition
sources are needed.
Hazardous places are further
classified into zones which
distinguish between places that have
a high chance of an explosive
atmosphere occurring and those
places where an explosive
atmosphere may only occur
occasionally or in abnormal
circumstances.
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