12 Servicing
12.1 Dangers during servicing
12 Servicing
12.1 Dangers during servicing
The following safety instructions must be observed strictly:
o
Have all work carried out only by authorized qualified personnel.
o
Before beginning work on the pump ensure that the electrical power supply is deenergized and is
secured against being switched back on.
o
Before beginning work, let the pump unit cool down slowly to the ambient temperature. Avoid
rapid temperature changes.
o
Pumped liquids can be hot, poisonous, combustible and caustic. Use corresponding protective
equipment.
o
Ensure that the pump is depressurized and that shut-off devices are not operated uncontrolled.
o
Collect any discharging pumped liquid safely and dispose of it in an environmentally compatible
manner in accordance with the applicable local regulations.
o
Ensure that the collection tank for discharging pumped liquids is sufficiently large.
o
Observe the tightening torques
Ä
o
Observe the operating instructions and data sheets of the components.
12.2 Wear
12.2.1
Signs of wear
The following table lists signs of progressive wear of individual pump elements:
Finding
Cause
Elimination
Increased running noises
Incipient damage to bearing
Replace the ball bearing.
Increased leaking
Incipient damage to seal
Replace the shaft seal.
Deposits at the shaft seal (only
applies for mechanical seal)
Low-volatile liquids
Clean the mechanical seal.
Increased play in the coupling
Advanced wear of the coupling
intermediate ring
Replace the coupling inter-
mediate ring.
Reduction in the delivery rate or
pressure under constant operat-
ing conditions
Advanced wear of screws and
housing
Replace the pump.
Tab. 10: Signs of wear
12.2.2
Shaft seal
Shaft seals are subject to natural wear that depends strongly on the respective conditions of use. Gen-
eral statements about the durability can therefore not be given.
Mechanical seal
In case of strong soiling through solidified or sticky leakage residues the manufacturer recommends
that you dismantle the mechanical seal completely and clean it, together with the inner surfaces of the
pump housing.
12.3 Replacing the coupling
12.3.1
Removing the coupling
Personnel qualification:
o
Fitter
Personal protective equipment:
o
Work clothing
o
Protective gloves
o
Safety boots
Aids:
o
Extractor
30
OIC 18en-GB Edition 2020-01
Operating instructions
