7 Servicing/Maintenance
52 of 80
HPK
1121.8/06-EN
DANGER
Risk of potentially explosive atmosphere inside the pump
Explosion hazard!
▷ The pump internals in contact with the fluid to be handled, including the seal
chamber and auxiliary systems, must be filled with the fluid to be handled at all
times.
▷ Provide sufficient inlet pressure.
▷ Provide an appropriate monitoring system.
CAUTION
Increased wear due to dry running
Damage to the pump set!
▷ Never operate the pump set without liquid fill.
▷ Never close the shut-off element in the suction line and/or supply line during
pump operation.
CAUTION
Impermissibly high temperature of fluid handled
Damage to the pump!
▷ Prolonged operation against a closed shut-off element is not permitted
(heating up of the fluid).
▷ Observe the temperature limits in the data sheet and in the section on
operating limits. (ðSection6.2,Page46)
While the pump is in operation, observe and check the following:
▪ The pump must run quietly and free from vibrations at all times.
▪ In case of oil lubrication, ensure the oil level is correct. (ðSection6.1.2,Page37)
▪ Check the shaft seal.
▪ Check the static sealing elements for leakage.
▪ Check the rolling element bearings for running noises.
Vibrations, noise and an increase in current input occurring during unchanged
operating conditions indicate wear.
▪ Monitor the correct functioning of any auxiliary connections.
▪ Cooling system
Take the pump out of service at least once a year to thoroughly clean the cooling
system.
▪ Monitor the stand-by pump.
To make sure that stand-by pumps are ready for operation, start them up once a
week.
▪ Monitor the bearing temperature.
The bearing temperature must not exceed 90 °C (measured on the outside of the
bearing bracket).
CAUTION
Operation outside the permissible bearing temperature
Damage to the pump!
▷ The bearing temperature of the pump (set) must never exceed 90 °C (measured
on the outside of the bearing bracket).
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