AU
16
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
support
temperature
| | | | | | Loss
of
fluid
through the mechanical seal
| | | | | | | Wear
rings
deteriorate
quickly
| | | | | | | |
Cause Solution
x
x
Suction or impulsion valves closed or poorly
regulated
Open the suction valve or search for work point
with the impulsion valve
x
Incorrect rotation direction
Change the motor connections
x x
Air comes in through the suction pipe,
Check the seal tightness of the pipe
x
Pump or suction pipe poorly primed
Correctly prime the pipe by positioning vent
connections in the highest points
x
Maximum height generated by the pump lower than
that required by the installation
Increase the rotation speed. If this is not possible,
a larger impeller or larger pump needs to be
assembled. Please ask.
x
The suction air does not leave through the impulsion
pipe
Open a discharge in the pump impulsion before
the retention valve or descendant angle
x
Rotation speed incorrect
Measure the speed, check the motor drive power
supply voltage
x
There is no liquid in the pump
Immediately shut down the pump and prime it.
x
The suction clapper does not close
Check the state of seals and clapper holder
x
Internal recirculation connection blocked
Remove the blockage. Dismount the inspection
point or cover in the suction side and clean.
x
x Poorly primed
Prime the pump again
x
Air comes in through the sealing system
Dismount the seal system and check it, or check
the seal tightness.
x x
x Impeller obstructed, deteriorated or imbalanced
Dismount the impeller, and inspect, balance or
change it.
x
x
Wear rings deteriorated or incorrectly assembled
Dismount the rings and change them
x
Counter pressure too high
Increase the rotation speed. If this is not possible,
a larger impeller or larger pump needs to be
assembled. Please ask.
x
Liquid viscosity or density greater than normal.
Reduce the design point or change the motor
x x x
x Poor alignment between the pump and motor
Align the coupling
x
Obstruction inside the pump, impeller or nozzles
Dismount the pump and clean
x
Real height to be generated by the pump is lower
than that of the design point, meaning the flow and
power are greater
Partially close the impulsion valve
x x x
Ballbearings deteriorated, poorly assembled, poorly
lubricated or excessively lubricated.
Change them, check assembly, lubricate them or
drain oil out of the support.
x
Excessive contact in rotating parts
Dismount the pump and check its elements are
correctly assembled
x
x Misaligned or deformed shaft
Dismount it and replace it
x
Loose impeller support nuts
Dismount the pump and tighten them
x x
x Pipe tensions on the pump
Reinforce the pipes and level the equipment
x
Lack of rigidity in the foundations or anchor bolts
loose
Make new foundations or tighten the bolts
x
Poorly assembled coupling, without suitable
separation between its two parts
Check the coupling
x
Very deteriorated mechanical seal, seal spring
broken or without elasticity, poorly assembled seal,
or joints broken, deformed or without elasticity.
Dismount and replace the seal, or dismount,
review damage and change as appropriate.
x
Pipe obstruction
Clean the pipes
x Re-changeable sleeve scratched or deteriorated
Dismount and change the sleeve
