5-1
5.
Maintenance and inspection
5.1
Precautions for maintenance and inspection
Perform the maintenance/checking of the pump in accordance with "5.1 Maintenance/inspection table."
Caution
Be sure to carry out a daily/periodic inspection according to the
Maintenance/inspection table.
Without carrying out such inspections, it may be impossible to prevent
failure and accidents, which also shortens the product life.
Warning
If you find any problems during inspection, immediately stop operation,
and solve the problem or contact TERAL or its relevant service provider.
Incorrect work may cause an accident.
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When carrying out a daily inspection, carefully observe the following points:
•
If the discharge pressure, electric current, vibration, noise, etc. of the pump are substantially different
from usual, it is a sign of impending failure. Therefore, closely investigate the matter and carry out
necessary service as soon as possible. For this purpose, it is recommended to keep an operation log.
•
The allowable temperature difference between the motor bearing surface temperature and the ambient
temperature shall be 40°C or less.
•
Check the mounting bolts and the screw of the power terminal block for looseness.
•
Check the piping for any water leakage or damage.
•
Check the mechanical seal for water leakage.
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Keep the following points in mind when the pump is left unused for a long period:
•
Be sure to keep the pump warm or discharge completely water from the piping of the pump because
freezing may occur inside the pump during the winter season, etc.
•
When the pump is not used for a long time, turn off the main power for safety. Otherwise, accumulated
dust may cause heating or ignition.
•
Since it may be difficult to rotate the pump because of a stuck sliding surface of the mechanical seal,
periodically operate the pump to prevent the sliding surface from being stuck.
•
If you have a spare pump, operate it periodically so that it can be used at any time.
■
When checking the mechanical seal, pay attention to the following items.
•
High-frequency sound (creak) may occur from the mechanical seal occasionally, but it does not
indicate a failure of the pump. Therefore, there is no problem with the quality of the pump which can be
used without taking any measures.
•
Normally, the mechanical seal leaks little water. If the water leakage increases, replace the mechanical
seal.
•
The mechanical seal is a precise device for preventing water leakage of the pump shaft penetration
part. In order to ensure satisfactory operation, carefully handle it.
•
At the early stage of operation of the pump, a small amount of water may leak due to the sliding
surface of the mechanical seal that have not been yet fitted, but the leakage will stop after several
hours of operation. This initial leakage is not a failure of the mechanical seal and the pump can be used
without any concern.
•
The Teflon ring of the mechanical seal for ASVM(N)(G) 25 and 32 may wear at an early stage of
operation of the pump, but such wear is not a failure of the mechanical seal. Therefore, there is no
problem with the quality of the pump which can be used without taking any measures.
