KSB RDLO Series User Manual

RDLO
Page 23 of 24
Faults
Pump discharge pressure too low
| Pump discharge pressure too high
| | Excessive flow rate
| | | Insufficient flow rate
||||Power consumption is too high
|||||Pump does not deliver
||||||Pump interrupts delivering
|||||||Pump runs rough (noise, vibrations)
||||||||Impermissible temperature increase at pump casing / shaft seal housing
|||||||||Bearing temperature too high
||||||||||Excessive leakage at the shaft seal
|||||||||||Drive is overloaded
||||||||||||Leakage at the pump
|||||||||||||
|||||||||||||
Cause Remedy
xx
Gland follower, seal cover (mech.
seal) have been tightened incorrectly;
wrong packing material
-Alter
- Replace
- Correct
- Replace the gland packing
- Replace worn components
xx
Lack of cooling liquid or dirty cooling
liquid chamber
- Check flushing / sealing liquid pressure
- Clean the sealing liquid line, possibly supply
sealing liquid from an external source and/or
increase its pressure
- Increase the cooling liquid flow rate
- Purify/clean the cooling liquid
xx
Pump is warped or sympathetic
vibrations in piping
- Re-align the pump / drive
- Check pipe connections and secure fixing of the
pump; if required, improve the fixing of the piping
- Take vibration-damping measures
x
Increased axial thrust - Check the duty point / pump design
- Check mode of operation
- Check suction flow
x
Insufficient or excessive quantity of
lubricant
- Clean the bearing
- Top up, reduce or change lubricant
xxx x
Motor is running on two phases only - Replace defective fuses
- Check the electrical cable connections
- Check the switchgear
xxx
Unbalance of rotor - Clean the rotor
- Check for run-out; re-align, if required
- Re-balance the rotor
x x x Defective bearings - Replace
xx
Insufficient flow rate - Re-adjust the duty point
- Fully open the shut-off element in the suction /
inlet pipe
- Fully open the shut-off element in the discharge
pipe
- Calculate or measure the hydraulic losses Hv
x x On star-delta starting, the motor does
not succeed in reaching the delta
stage
- Check the electrical cable connections
- Check the switchgear
x x x Impermissible air or gas content in
medium pumped
- Vent
- Check integrity of suction pipe; seal, if required
x x xxx
Air intake at pump inlet - Correct the suction conditions
- Reduce the flow velocity at the suction pipe inlet
- Increase the suction head
- Check integrity of suction pipe; seal, if required
- Replace defective pipes
x
Cavitation (rattling noise) - Correct the suction conditions
- Check mode of operation
- Increase the suction head
- Install pump at a lower level
x x Foundation not rigid enough - Check
-Alter
x x x x x Impermissible parallel operation - Re-adjust the duty point
- Alter the pump characteristic H
1)
x x Shaft run-out - Replace the shaft
xxxx
Impeller rubs against casing
components
- Check the rotor
- Check the impeller position
- Check whether pipe connections are free from
stresses or strains
1) Consult KSB

KSB RDLO Series Specifications

General

Brand	KSB
Model	RDLO Series
Category	Water Pump
Language	English