Installation, Operation and Maintenance manual
5
PowerCore
®
Dust Collectors - Series CPV
Compressed air is recommended for collectors that operate using reverse jet
cleaning. Alternative gases should be assessed before use to ensure that
explosive atmospheres are not introduced during media cleaning.
Where the equipment supplied is suitable for working within a potentially
explosive atmosphere (as defined by Directive 2014/34/EU) it will be according
to the categories and conditions marked on the collector serial nameplate.
You should ensure the equipment supplied by others is also suitable. If no
marking is given on the serial nameplate then the supplied equipment is not
suitable for use in potentially explosive atmospheres.
Care should be taken to ensure that any potentially explosive atmosphere
is not present when performing operations that increase the risk of ignition
(opening of controller for adjustment or electrical repair for example). Ensure
the installation is always returned to its original state.
To reduce the risk of ignition when handling explosive or flammable materials,
it is important that the accumulation of flammable deposits are prevented/
removed, e.g. from within ducting etc.
If the collector is handling a potentially explosive dust or is placed in a
potentially explosive atmosphere, then all motors should be connected to
thermal protection devices to prevent them exceeding their maximum surface
temperature. All electrical equipment should comply with a category according
to EN 60079-0.
Where the dust being processed can ignite due to exothermic reaction,
including self ignition, the installation MUST be fitted with a suitable explosion
protection method (venting for example). The risk of ignition can be minimised
by avoiding the accumulation of dust layers with regular cleaning.
Precautions, as set out in the Scope of Delivery, are used to minimise the risk
of ignition of any dust clouds contained within the dust collector. The possibility
of other ignition sources being introduced into the collector during periods
where any dust cloud may be present should be minimised. Particular care
should be taken to avoid introducing glowing particles via the inlet ducting.
You should ensure that explosions are not allowed to propagate into the dust
collector (using suitable isolation devices) since pressures may be generated
leading to unsafe equipment rupture.
Where applicable, equipment connected to the dust collector (for example,
a cyclone) should be protected, using suitable isolation devices, against the
transfer of flame and pressure if, in the event of an explosion initiating inside the
dust collector, the connected equipment is not capable of safely withstanding
these effects.
It may be necessary to provide a facility to shut down the equipment in the
event of an explosion.
Part of the risk assessment on possible ignition sources for dust and gas
mixtures with very low MIE, has considered the electrostatic risk from cone
discharges. Here the basis of safety is based on using a conductive bin, dusts
with a median particle size of less than 400µm and advising frequent emptying.
You may wish to consider the use of a sprinkler system when handling explosive
or flammable materials.
