Table of Contents
Advertisement
SILVER M
INSTALLATION – OPERATING - MAINTENANCE
8.3 Avoidance of ignition sources
Ventilator
In a potentially explosive atmosphere, the ventilator may be
operated only with the respective identification marking and
authorisation for the deployment zone. For this, mechanically
generated sparks, such as scraping of the running wheel with the
inlet nozzle, must be avoided. This must be ensured through
appropriate material combination and through a careful adjustment
of the die gap. Furthermore, the maximum allowable ventilator
turning speed may not be exceeded, as otherwise parts from the
running wheel can loosen and possibly cause mechanical induced
sparks!
Under no circumstances should the ventilator scrape against the
inlet nozzle! This can cause ignition sparking.
The ventilator is to be continually monitored for vibrations. This can
be achieved by an explosion protection designed vibration monitor
(MSR), as appropriate, or through a daily visual check process. If
vibrations are optically or acoustically perceivable, the equipment
must be immediately taken out of service and the manufacturer
notified.
Electrical components
All electrical components (e.g. electrical motors, lamps, switches,
etc.) must possess with the respective identification marking and be
authorised for the deployment category in order to be operated in a
potentially explosive atmosphere.
Cabling must be carried out in accordance with the applicable
standards. Overall, a proper potential equalisation must be
warranted throughout the entire system so that static electricity can
be eliminated as a source of potential ignition sparking.
As a rule, the frequency converter is not suitable for deployment in
a potentially explosive atmosphere. It will be delivered as a loose
component only and must not be deployed in a potentially explosive
atmosphere.
Lightening protection
Roof control centres with Ex-protection, in particular, require the
installation of proper lightening protection!
Hot surfaces
Depending upon the atmosphere, it must be noted that pipeline
(e.g. for heaters) temperatures can reach up to 110°C. These
temperatures can be sufficient to be an ignition source.
29
Advertisement
Table of Contents
