Idiomas disponibles
Idiomas disponibles
ENGLISH
The work must be carried out in accordance with a controlled procedure to minimise the risk of
a flammable vapour or gas being present while the work is being carried out.
1.3. General workspace
All maintenance personnel and others working in the area should be briefed on the nature
of the work to be carried out. Work in confined spaces must be avoided. The area around the
workspace should be divided into sections. Ensure that conditions within the workspace are
safe by keeping flammable material under control.
1.4. Refrigerant verification
The area should be checked with an appropriate refrigerant detector before and during
work to ensure that the technician is warned of potentially flammable atmospheres. Ensure
that the leak-detection equipment used is suitable for use with flammable refrigerants, i.e.
non-sparking, adequately sealed, or intrinsically safe.
1.5. Presence of fire extinguishers
If any high-temperature work is to be carried out on the refrigeration equipment or any
associated parts, suitable extinguishing equipment must be available. Always have a
dry-powder or CO2 fire extinguisher nearby the load area.
1.6. Absence of ignition sources
No person carrying out work related to a refrigeration system involving the exposure of piping
containing or having contained flammable refrigerant should use any source of ignition in
such a manner as to create a risk of fire or explosion. All possible sources of ignition, including
cigarette smoking, should be kept far enough away from the installation, repair, pick-up, and
disposal site, where flammable refrigerant can be released into the surrounding space. Before
work starts, the area around the equipment must be thoroughly examined to ensure that no
danger or risk of ignition is present. "No Smoking" signs must be displayed.
1.7. Ventilation
Ensure that the area is outdoors or adequately ventilated before intervening in the system
or carrying out any work at high temperature. Proper ventilation must be kept at all times
during work. Ventilation should safely disperse any refrigerant released and preferably expel
it externally to the atmosphere.
1.8. Verification of refrigeration equipment
When electrical components are replaced, they must be fit for purpose and to the correct
specification. The manufacturer's maintenance and service guidelines must be followed at all
times. In case of doubt, refer to the manufacturer's technical department for assistance.
The following checks must be applied to installations using flammable refrigerants:
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The load size is in accordance with the size of the room where refrigerant-containing parts
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are installed.
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Ventilation machinery and outlets can be properly operated and are unobstructed.
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If an indirect cooling circuit is used, the secondary circuit must be checked for refrigerant
presence.
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Equipment marking remains visible and legible. Illegible markings and symbols should be
corrected.
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The components or refrigerant piping are installed in a position where they are not
susceptible to exposure to any substance that may corrode the refrigerant-containing
components, unless the components are made of materials that are inherently resistant
to corrosion or are properly protected against it.
1.9. Verification of electrical devices
Repair and maintenance of electrical components should include initial safety checks and
component-inspection procedures. If there is a fault that may compromise safety, then no
power supply should be connected to the circuit until the fault is satisfactorily dealt with. If
the fault cannot be corrected immediately, but continued operation is necessary, a suitable
temporary solution must be used. This should be reported to the owner of the equipment so
as to inform all parties.
During initial safety checks, make sure
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that capacitors are unloaded–this must be done in a safe manner to avoid sparks;
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that no live wiring or electrical components are exposed while loading, recovering, or
purging the system;
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that there is continuity in the earth connection.
2. Repair of sealed components
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During the repair of sealed components, all power supplies should be disconnected from
the equipment being worked on prior to any removal of sealed covers, etc. If it is absolutely
necessary to have a power supply to the equipment during service, then a permanently
operating form of leak detection should be placed at the most critical point to warn of a
potentially hazardous situation.
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Particular attention must be paid to the following to ensure that, when working on electrical
components, the housing is not altered in such a way as to affect safety. This must include
damage to cords, an excessive number of connections, terminals not conforming to the
initial specification, damage to seals, incorrect fitting of the stuffing box, etc.
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Ensure that the instrumentation is securely mounted.
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Ensure that seals or sealing materials have not degraded until no longer being useful to
preventing the penetration of flammable atmospheres. Spare parts must be in accordance
with the manufacturer's specifications.
NOTE:
the use of silicone sealant may inhibit the effectiveness of some types of leak-
detection equipment. Intrinsically safe components do not have to be isolated before work.
ENGLISH
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