7.5 Shaft seal run-in period
The seal faces are lubricated by the pumped liquid, meaning that
there may be a certain amount of leakage from the shaft seal.
When the pump is started for the first time, or when a new shaft
seal is installed, a certain run-in period is required before the
leakage is reduced to an acceptable level. The time required
depends on the operating conditions, that is, every time the
operating conditions change, a new run-in period is started.
Under normal conditions, the leaking liquid evaporates, and as a
result, no leakage will be detected.
Liquids such as kerosene do not evaporate, and drops are visible,
but it is not a shaft seal failure.
7.5.1 Mechanical shaft seals
Mechanical shaft seals are precision components. If the mechanical
shaft seal of a recently installed pump fails, it normally happens
within the first few hours of operation. The main cause of such
failures is improper installation of the shaft seals and/or mishandling
of the pump during installation.
7.6 Reference readings of monitoring equipment
We recommend that you take initial readings of the inlet and outlet
pressures by using pressure gauges.
The readings can be used as reference in case of abnormal
operation.
8. Service
DANGER
Moving machine parts
Death or serious personal injury
‐ Before any inspection, maintenance, service or repair
of the product, make sure the motor controls are in the
"OFF" position, locked and tagged.
DANGER
Electric shock and unintended pump start
Death or serious personal injury
‐ Before starting work on the product, switch off the
power supply. Make sure the power supply cannot be
accidentally switched on. Use logout-tagout if
available.
8.1 Contaminated products
CAUTION
Biological hazard
Minor or moderate personal injury
‐ Flush the pump thoroughly with clean water and rinse
the pump parts in water after dismantling.
The product will be classified as contaminated if it has been used
for a liquid which is injurious to health or toxic. If you request
Grundfos to service the product, contact Grundfos with details
about the pumped liquid before returning the product for service.
Otherwise, Grundfos can refuse to accept the product for service.
The product must be cleaned thoroughly before you return it.
Costs of returning the product are to be paid by the customer.
8.2
Maintenance
DANGER
Moving machine parts
Death or serious personal injury
‐ Before any inspection, maintenance, service or repair
of the product, make sure the motor controls are in the
"OFF" position, locked and tagged.
DANGER
Electric shock and unintended pump start
Death or serious personal injury
‐ Before starting work on the product, switch off the
power supply. Make sure the power supply cannot be
accidentally switched on. Use logout-tagout if
available.
8.2.1 Maintenance of the pump
The pump is maintenance-free.
8.2.2 Maintaining the mechanical shaft seals
Mechanical shaft seals are maintenance-free, working almost
without any leakages.
• If any considerable or increasing seepage occurs, check the
mechanical shaft seal immediately.
• If the sliding surfaces are damaged, replace the entire shaft
seal. Treat mechanical shaft seals with utmost care.
End suction pumps equipped with mechanical shaft seals are
matched to the operating conditions for which the pump was sold.
Observe the following precautions to avoid shaft seal damage and
achieve maximum shaft seal life.
Do not run the pump dry or against a closed valve. Dry
running will cause shaft seal failure.
Do not exceed the temperature or pressure limitations for
the mechanical shaft seal in use.
8.2.3 Maintaining the motor
It is important to keep the motor clean in order to ensure adequate
ventilation.
• Check the motor at regular intervals.
• If the pump is installed in a dusty environment, check and clean
it regularly.
8.2.3.1
Lubrication of motor
Always follow the motor manufacturer's lubricating instructions.
Some information is stated on the motor nameplate, and additional
information can be found in the installation and operating manual
from the motor manufacturer.
8.3
Service kits
Service kits for the products, see Grundfos Product Center in
www.grundfos.com or Service Kit Catalogue.
24
English (US)
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