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The bearing knocks or experiences scoring
(damage on the bearing running surfaces due
to jolts during storage)
Impeller stuck
:
Possible causes
Deposits from the seal liquid occurred during
storage
Possibly due to solid materials ingestion
Section 7: Preventive Maintenance
7.1 Periodic Maintenance
After approximately 150 operating hours, it is
recommended to conduct the first general inspection
of the machine. During this inspection, the following
aspects should be checked:
1. Impurities in Feeding Fluids and Operating Liquid:
• Ensure that no major impurities are present in the
feeding fluids or operating Liquid.
2. Compliance with Technical Data:
• Verify that the machine is operating within the
specified technical data, such as power consumption
and temperature. Any deviations should be addressed
and corrected if necessary.
3. Leakage:
• Check for any impermissible leakage and take
appropriate measures to resolve the issue if it is
detected.
4. Operation and Noise:
• Assess the smooth Operation of units and monitor
the operating noises of the bearings. Any changes or
worsening of operating noises should be investigated
and addressed promptly.
5. Foundation:
NBE O & M Document No. NES/NBE/O&M
Change the bearing.
Avoid jolt during storage
Solutions:
Loosen the rotor mechanically by loosening the mounting screws
of the guide bearing, removing compensating washers, and
unscrewing the cover of the guide bearing.
Move the rotor back and forth by light strokes with a lead hammer
on both faces of the shaft.
Manually turn on the rotor
Then, reassemble or secure the originally removed or loosened
parts
Clean and decalcify the machine
• Inspect the foundation for any signs of settling or
cracks. Address any issues with the foundation to
ensure the stability and proper functioning of the
machine.
6. Valves, Filters, and Sieves:
• Check that valves, filters, and sieves are free of foreign
bodies. If any foreign bodies are found, clean them,
and specify a corresponding period for the next
inspection.
When cleaning the screens, it is important to remove
them with a small piece of piping instead of pulling
them out directly. This method prevents any dirt
present on the screen surface from entering the
machine.
Note: Always refer to the instructions and
specifications provided in the assembly manual and
operating manual of the machine and its system
components.
For any disturbances or unusual conditions that cause
stress on the machine, it is necessary to perform
appropriate inspections or overhauls to address and
rectify the issues promptly.
By conducting the first general inspection and
addressing any identified issues, the machine can be
maintained in optimal condition for continued
reliable Operation.
Page 22 of 43
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