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are manufactured with intrinsically corrosion resistant materials or are
appropriately protected from corrosive agents.
i. Check the electric devices
The repair and maintenance interventions of electric components must envision
initial safety checks and component inspection procedures.
In the case of a fault which may compromise safety, no electric power supply
must be connected to the circuit until it has been suitably repaired.
If the fault cannot be repaired immediately, but the operation must be continued,
use a suitable temporary solution. This solution must be communicated to the
owner of the plant so that all parties can be informed.
The initial safety controls envision:
• draining the condensers: this operation must be performed safely to prevent
the possible formation of sparks;
• no exposure of components and electric wiring to voltages during loading,
repair or purification of the system;
• the continuity of the earth.
l. Repair interventions of the hermetic components
• During the repair of hermetic components, all electric power supply lines
must be disconnected from the appliance running, before the eventual
removal of the hermetic covers, etc.
Whenever it is absolutely necessary to have electric power supply for the unit
during maintenance, a constantly active leak detector must be positioned
in the most critical point in order to signal a potentially dangerous situation.
• Particular attention must be paid to the following to guarantee that, in the
case of intervention on electric components, the housing is not altered in a
way to affect the level of protection.
This includes damage to cables, excessive number of connections, terminals
not manufactured in compliance with original specifications, damage to the
gaskets, incorrect installation of the closing devices, etc.
• Make sure that the appliances are mounted securely.
• Make sure that the gaskets or sealing materials have not deteriorated to
the point that they cannot be used to prevent the entry of inflammable
atmospheres. The spare components must be compliant with manufacturer
specifications.
The use of silicone-based sealants can inhibit the efficacy of some types
of leak detection equipment.
Intrinsically safe components do not have to be isolated before working
on them.
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