4 Operation
Pay attention to possible faults.
Study the instructions carefully.
4.2
Fault finding
NOTE!
Study the maintenance instructions carefully before replacing worn parts. - See section 5.1 General maintenance
Problem
Cause/result
Remedy
Overloaded motor
-
Pumping of viscous liquids
-
Larger motor or smaller impeller
-
Pumping of liquids with high density
-
Low outlet pressure (counter pressure) -
Higher counter pressure (throttling)
-
Lamination of precipitates from the
liquid
-
Frequent cleaning
Cavitation:
-
Damage
-
Low inlet pressure
-
Increase the inlet pressure
-
Pressure reduction (sometimes to
zero)
-
High liquid temperature
-
Reduce the liquid temperature
-
Increasing of the noise level
-
Reduce the pressure drop before the
pump
-
Reduce speed
Leaking shaft seal
-
Dry run (See 4.1 Operation/Control)
Replace:
All wearing parts (See 5.1 General
maintenance)
-
Incorrect rubber grade
If necessary:
-
Change rubber grade
-
Abrasive particles in the liquid
-
Select stationary and rotating seal ring
in Silicon Carbide/Silicon Carbide
Leaking seals
Incorrect rubber grade
Change rubber grade
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