ATEX dust explosions
Solids Handling Safety
# Dust explosion physical properties # MIT - Minimum Ignition Temperature of dust
The european ATEX directives 94/9/CE and 1999/92/CE, revised in 2014, have introduced the notion of zoning in order to identify and classify areas within a factory that present a risk of presence of powder cloud in explosive conditions.
The factory operator must
carry out a dust explosion risk analysis, often called
ATEX study, in order to classify the areas according to
the probability of presence of a dust cloud (zoning). On
the other side, the equipment supplier must supply an
equipment that is compliant for the zone defined by the
2. Zoning definition and classification
The zoning is fundamental to help the process operator
to put in place the measures necessary to reduce the risks
of inflammation of a dust cloud, or to put in place
protections in case of explosions.
Note that layers and deposits of powder must be considered
as well as it could start burning in case of high
temperature or be put in suspension and form an explosive
3. Examples of zoning
[Laurent] is giving some common examples of equipment often falling in one category or another. WARNING : this is only a general indication, only the specific risk assessment of a process will be able to confirm if one equipment belongs to one zone or another depending on a particular context.
The zoning definition and the
reasons justifying a particular zoning, or the absence
of zoning, must be
described in the ATEX risk analysis and the
measures to put in place explained. Conclusions of the
risks analysis must be implemented by the factory.
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