Speck pumpen Normblock Installation & Operating Manual page 97

7 Servicing/Maintenance
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 section on operating limits. (⇨ Section 6.2
Page 31)
While the pump is in operation, observe and check the following:
▪ The pump must run quietly and free from vibrations at all times.
▪ Check the shaft seal. (⇨ Section 6.1.4 Page 30)
▪ Check the static seals 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.
▪ Monitor the stand-by pump.
To make sure that the 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 at the motor
housing).
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 motor housing).
NOTE
After commissioning, increased temperatures may occur at grease-lubricated rolling
element bearings due to the running-in process. The final bearing temperature is
only reached after a certain period of operation (up to 48 hours depending on the
conditions).
7.2.2 Inspection work
DANGER
Excessive temperatures caused by friction, impact or frictional sparks
Explosion hazard!
Fire hazard!
Damage to the pump set!
▷ Regularly check the cover plates, plastic components and other guards of
rotating parts for deformation and sufficient distance from rotating parts.
7.2.2.1 Checking the clearances
To check the clearances, remove the back pull-out unit.
If the clearance is larger than permitted (see the following table), fit a new casing
wear ring 502.1 and/or 502.2.
The clearances specified refer to the impeller diameter.
Normblock
37 of 58