Trouble-Shooting - KSB AU Manuel D'instructions

8

Trouble-shooting

The pump does not move the fluid
| The pump does not eliminate the suction air
| | Insufficient pressure or flow
| | | Excessive absorbed power
| | | | Excessive vibrations and noise
| | | | | Excessive bearing housing/bracket temperature
| | | | | | Leakage through the mechanical seal
| | | | | | | Quick deterioration of wear plate
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| Cause
Suction or discharge valves closed or poorly
regulated
Incorrect rotation direction
Air comes in through the suction pipe,
Pump or suction pipe poorly primed
Maximum height generated by the pump lower than
that required by the installation
Formation of air pockets in the piping
Rotation speed incorrect
There is no liquid in the pump
The suction clapper does not close
Internal recirculation connection blocked
Poorly primed
Air comes in through the sealing system
Impeller obstructed, deteriorated or imbalanced
Wear plate deteriorated or incorrectly assembled
Counter pressure too high
Liquid viscosity or density greater than normal.
Poor alignment between the pump and motor
Obstruction inside the pump, impeller or nozzles
Real height to be generated by the pump is lower
than that of the design point, meaning the flow and
power are greater
Ball bearings deteriorated, poorly assembled,
poorly lubricated or excessively lubricated.
Excessive contact in rotating parts
Misaligned or deformed shaft
Loose impeller support nuts
Pipe tensions on the pump
Lack of rigidity in the foundations or anchor bolts
loose
Poorly assembled coupling, without suitable
separation between its two parts
Very deteriorated mechanical seal, seal spring
broken or without elasticity, poorly assembled seal,
or joints broken, deformed or without elasticity.
Pipe obstruction
Re-changeable sleeve scratched or deteriorated
Solution
Open the suction valve or search for work point with
the discharge valve
Change the motor connections
Check the seal tightness of the pipe
Correctly prime the pipe by positioning vent
connections in the highest points
Increase the rotation speed. If this is not possible, a
larger impeller or larger pump needs to be assembled.
Please ask.
Fit a vent/purge valve before the check valve
Measure the speed, check the motor drive power
supply voltage
Immediately shut down the pump and prime it.
Check the state of seals and clapper holder
Remove the blockage. Dismount the inspection point
or cover in the suction side and clean.
Prime the pump again
Dismount the seal system and check it, or check the
seal tightness.
Dismount the impeller, and inspect, balance or change
it.
Dismount the wear plate and change it
Increase the rotation speed. If this is not possible, a
larger impeller or larger pump needs to be assembled.
Please ask.
Reduce the design point or change the motor
Align the coupling
Dismount the pump and clean
Partially close the discharge valve
Change them, check assembly, lubricate them or
drain oil out of the support.
Dismount the pump and check its elements are
correctly assembled
Dismount it and replace it
Dismount the pump and tighten them
Reinforce the pipes and level the equipment
Make new foundations or tighten the bolts
Check the coupling
Dismount and replace the seal, or dismount, review
damage and change as appropriate.
Clean the pipes
Dismount and change the sleeve
AU
17