8. ATEX operation
The following ATEX zoning and ignition source analysis is applied to the filter unit.
8.1. ATEX zoning for WNA-AL
Area
Ex zone
Reason/Cause
Dusts
Gases, vapours, mist
Installation location of
filter unit, spark
separator and controller
No Zone
Installation in areas at risk of explosion not
permitted.
See: Intended use
Zone 2
(in an environment of 5m around
the outlet)
Emission of hydrogen into the installation
premises cannot be definitively excluded.
Suction line between
extraction point and
WNA
Zone 22
Entry of dust via the extraction points /
varying concentration.
Speed of flow in pipe >= 20 m/s, therefore
deposits are avoided in practical terms.
Zone 2
Accumulation of hydrogen cannot be
excluded when stopped.
WNA contact and calm
zone zone
Zone 22
Due to the high level of filtration,
dust bound in water
Zone 2
Accumulation of hydrogen cannot be
excluded when stopped.
WNA clean air zone
No Zone
Due to the high level of efficiency of the
contact zone and of the downstream plate
filter and wire mesh filter, the input of
potentially dangerous quantities of aluminium
dusts and/or magnesium dusts is improbable.
Zone 2
Accumulation of hydrogen cannot be
excluded when stopped
Mud zone / water box
No Zone
Dusts are bound in the water.
Zone 2
Hydrogen may be released when the
container is emptied
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18.11.2021