KRAL DL3 Series, Operating Instructions Manual

Page: 27 / 60

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 station ensure that the electrical power supply is deenergized
and is secured against being switched back on.
o
Before beginning work, let the pump station 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 station is depressurized and that shut-off devices are not operated uncon-
trolled.
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
Appendix, Page 57.
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 station elements:
Finding Cause Elimination
Increased running noises Incipient damage to bearing Replace the pump.
Increased leaking Incipient damage to seal Replace the shaft seal.
Deposits at the shaft seal Low-volatile liquids
Clean the shaft 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.
Increased pressure drop at the
strainer Soiling of the strainers Clean the strainer.
Tab. 14: Signs of wear
12.2.2 Mechanical 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.
In case of strong soiling with 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.
12.2.3 Radial 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.
Operating instructions OID 06en-GB Edition 2019-11 27