5
Preventing further ignition sources
5.1
Putting cleaner in the tank - mechanically generated sparks
If the cleaner is not permanently installed in the tank, but is retracted or retracted
automatically or manually, there is a risk of mechanically generated sparks during
collisions.
To avoid sparks,
•
the lowering and lifting speed must not exceed 1 m/s
•
the impact energy does not exceed 500 J
•
It must be avoided that the cleaner comes into contact with aluminium and
other light metals.
If this can not be avoided, further requirements from the standards must be met,
see EN ISO 80079-36:2016. The risk of sparks generated by single strikes must
always be considered in the ignition hazard analysis of the cleaning system.
For cleaning, the cleaner must be firmly connected to the tank via a mounting
flange or via a manhole cover plate.
Additional safety measures must be taken so that the cleaner starts only in the
container.
Proper condition and safe handling of the device must be ensured by the
operator.
5.2
Manhole cover
If a cleaner in a potentially explosive area is placed in a tank with a manhole
cover plate, it must rest flat. Open ventilation holes must not be installed.
It must be taken into account that the cleaner has no flame arrester and the
connection of the cleaner housing ==> Cleaner lance and container interior is not
flame-proof.
5.3
Electric functions
If the cleaner is equipped with electrical components, e.g. sensors and motors,
they must have their own ATEX approval. The operator must ensure the correct
connection and secure cable routing.
In particular, cable entry points must comply with the valid technical regulations
and must not show any kinks or sharp edges.
5.4
Grounding - electrical load
Tanks must be grounded. Tankers must be grounded via copper cable and
connectors.
The cleaner (orbital cleaner, rotating and static cleaners) must be introduced into
the system via the grounded piping.
The operator is obliged to ensure equipotential bonding with the tank for the
cleaner. All conductive parts of the system must be grounded.
Preventing further ignition sources
Putting cleaner in the tank - mechanically generated sparks
430BAL013060EN_4
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08.09.2020