Maintenance
7 Maintenance
For pumps in explosion hazard areas (→ ATEX additional
instructions).
Trained service technicians are available for fitting and
repair jobs. Present a pump ed medium certificate (DIN
safety data sheet or safety certificate) when requesting
service.
7.1 Inspections
The inspection intervals depend on the operational strain
on the pump.
DANGER
Risk of injury due to running pump!
Do not touch the running pump.
Do not carry out any work on the running pump.
WARNING
Risk of injury and poisoning due to hazardous pumped
media!
Use protective equipment when carrying out any work on
the pump.
1. Check at appropriate intervals:
– compliance with minimu m flow rate
– roller bearing temperatures < 70 °C
– normal operating conditions unchanged
– top up oil if necessary
– coupling alignment and condition of elastic elements
2. For trouble-free operation, always ensure the following:
– no dry running
– no leaks
– no cavitation
– suction-side gate valves open
– unobstructed and clean filters
– sufficient supply pressure
– no unusual running noises and vibrations
– no excessive leakage at the shaft seal
– proper functioning of auxiliary operating systems
7.2 Maintenance
Service life of the roller bearings for operation within the
allowable operating regime: > 2 years
Intermittent operation, high temperatures, low viscosity and
aggressive ambient and process conditions reduce the ser-
vice life of roller bearings.
Stationary seal rings are subject to natural wear, which
strongly depends on the actual operating conditions.
Therefore, general statements regarding their service life
cannot be made.
DANGER
Risk of injury due to running pump!
Do not touch the running pump.
Do not carry out any work on the running pump.
Isolate the motor from its supply voltage and keep it locked
in that state while carrying out any fitting or maintenance
work.
DANGER
Risk of death through electric shock!
Have all electrical work carried out by qualified electricians
only.
WARNING
Risk of injury and poisoning due to hazardous or hot
pumped media!
Use protective equipment when carrying out any work on
the pump.
Allow the pump to cool down completely before commenc-
ing any work.
Make certain that the pump is unpressurized.
Empty the pump, safely collect the pumped medium and
dispose of the medium in accordance with environmental
rules and requirements.
7.2.1 Roller bearings with grease lubrication
1. As a precaution, replace roller bearings with lifetime lubri-
cation every 2 years (recommen ded).
2. Relubricate roller bearings that can be relubricated:
– after every 3000 hours of operation
– (→ 9.2.5 Lubricants, Page 42).
24 NPC series BA-2005.07 EN – 02
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