KSB MK, Installation & Operating Manual

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8 Trouble-shooting
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MK
A B C D E F Possible cause Remedy
11)
- ✘ - - ✘ ✘ Pump is warped or sympathetic vibrations in
the piping. ▪ Check pipeline connections and secure
fixing of pump; if required, reduce the
distances between the pipe clamps.
▪ Fix the pipelines using anti-vibration
material.
- ✘ - - ✘ - Defective bearing(s) ▪ Replace the bearing(s). If required, re-
install the shaft upside down.
- ✘ - - - ✘ Pump clogged by sand, dirt in the pump
sump. ▪ Clean the intake, pump components and
lift check valve.
▪ Drain and clean the pit.
- - - -
✘ ✘
Rotor is out of balance, shaft is warped
▪
Clean the impeller.
▪ Re-balance the impeller.
▪ Fit a new shaft.
- ✘ - - - - Current exceeds the value set in the motor
protection switch.
▪ Set the motor protection switch to the
nominal value given on the name plate of
the motor.
- - ✘ - - - Excessive temperature of the fluid handled ▪ Lower the fluid temperature.
- - - - - ✘ Aggressive fluid ▪ Use other bearing material.
- - - - -
✘
Abrasive fluid
▪
Use different bearing material, if necessary.
▪ Supply flushing water (lubrication by
external fluid).
- - - - ✘ - Cavitation (rattling noise) ▪ Check steam trap.
▪
Increase suction head.
▪ Reduce condensate temperature.
▪ Increase back pressure by throttling.