Flameproof motors | 15
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atmospheric air and temperature fluctuations. Due
to the air humidity, it is possible the liquid
condensation and, depending on the kind and air
contamination degree, aggressive substances may
penetrate into these spaces.
As a consequence, after long periods the internal
components such as the bearings might get rust, the
insulation resistance can decrease to under the
admissible values and the grease lubricant capacity
in the bearings is adversely affected. This influence
increases the damage risk before commissioning of
the plant.
The flameproof joints of terminal boxes that were
exposed during storage, for example to allow the
measuring of the insulation resistance, before
assembling and bolting, should be properly
protected against corrosion with a thin layer of
grease from one type recommended by WEG in
section 3.7.8.
NOTE
To keep manufacturer's warranty, it
should be insured that the described
preventive
measures
in
this
instructions
are
followed
and
registered:
constructive
aspects,
preservation, packing, storage and
inspections.
3.7.3. STORAGE PLACE
3.7.3.1 INDOOR STORAGE
In order to ensure the best storage conditions to the
motor during long standstill periods, the storage
location should obey rigorously the criteria
described as follow:
-
Closed storage room with roof;
-
The location must be protected against
humidity,
vapors,
aggressive
fumes
discharge, fast heat changes, gnawing and
insects;
-
It must not present corrosive gases such as
chlorine, sulfur dioxide or acid;
-
It must not present continuous or intermittent
vibrations;
-
It should have ventilation system with filter;
-
It must not present quickly changes of
temperature;
-
Ambient temperature (5° C < T < 60 °C);
-
Relative air humidity < 50%;
-
It should have prevention against dirt and
dust deposits;
-
It should have fire detection system;
-
Electrical supply for space heater and
illumination must be provided.
If some of these requirements can not be attended
by the storage environment, WEG suggests that
additional protections be incorporated in the motor
packing during the storage period, like follows:
- Closed wooden or similar box with electrical
installation, enable to the space heaters supply;
- Closed wooden box or similar with installation
that allows the space heaters be energized;
- If there is a risk of fungus infestation and
formation, the packing must be protected in the
storage location by spraying or painting it with
appropriated chemical agents;
- Preparation of packing must be done with
greatest care by an experienced person. A
reliable packing company must take over of the
packing.
3.7.3.2 OUTDOOR STORAGE
The outdoor storage of the motor is not
recommended.
If the external storage cannot be avoided, the motor
should be packed in specific packing for this
condition, as described bellow.
-
For outdoor storage, besides the packing
recommended above, we recommend to
cover completely this packing with a
protection against dust, humidity and other
strange materials.
-
Place the packing in pallets, wooden bunches
or foundations that guarantee the protection
against the soil humidity.
-
Prevent the packing sink itself in the soil.
-
After covering the machine, a shelter should
be build to protect it against rain, snow and
excessive sun heat.
ATTENTION
It is recommendable to check the
storage local conditions and the
motors condition according to the
maintenance plan for long term
storage, described in this manual.
3.7.4. SPARE PARTS
If parts have been supplied separately (terminal
boxes, endshields, covers, etc...) these ones must
be packed as described above.
The air relative humidity inside the packing should
not exceed 50% until unpacking the machine.
3.7.5. SPACE HEATERS
The space heaters installed in the motor must be
energized during the storage period to avoid the
moisture condensation inside the motor and this