KRAL DKC Series - Maintaining the strainers; 12 Servicing; Dangers during servicing; Signs of wear

12 Servicing
11.4 Maintaining the strainers
11.4 Maintaining the strainers
Personnel qualification: o Fitter
Personal protective equipment: o Work clothing
o Protective gloves
o Safety boots
1. Check the strainers visually and acoustically every four weeks.
2. In the case of a clear pressure drop clean the strainers Ä Servicing,Page39.
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53.
o Observe the operating instructions and data sheets of the components.
12.2 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.17: Signs of wear
12.3 Servicing the pump station
Personnel qualification: o Fitter
Personal protective equipment: o Work clothing
o Face protection
o Protective gloves
o Protective helmet
Aids: o Collection tank
Operating instructions
OID 02en-GB Edition 2019-11
39