Troubleshooting
INOXPA S.A.U.
·
01.611.30.08EN · (0) 2020/02
13
7. Troubleshooting
The following table provides solutions to problems that might arise during the operation of the pump. The pump
is assumed to have been properly installed and be suitable for the relevant application.
Please contact INOXPA if technical assistance is required.
Motor overload
The pump does not provide enough flow or pressure
No pressure on the discharge side
Uneven discharge flow / pressure
Noise and vibration
The pump gets clogged
Overheated pump
Excessive wear
The mechanical seal leaks
PROBABLE CAUSES
SOLUTIONS
•
•
Wrong direction of rotation
Reverse the direction of rotation
•
•
•
•
NPSH is not high enough
Increase the available NPSH:
- Place the suction tank higher
- Place the pump lower
- Reduce steam pressure
- Increase the diameter of the suction
pipe
- Shorten and simplify the suction pipe
•
Pump not drained
Drain or fill
•
•
•
•
Cavitation
Increase suction pressure (see also 2)
•
•
•
•
Air is suctioned by the pump
Check the suction pipe and all its
connections
•
•
•
Clogged suction pipe
Check the suction pipe and all its filters,
if any
•
•
Discharge pressure too high
If necessary, reduce load losses, e.g.
by increasing the diameter of the pipe
•
•
•
Flow too high
Reduce speed
•
•
•
•
•
•
Fluid viscosity too high
Reduce the viscosity, e.g. by heating
the fluid
•
•
•
•
•
Fluid temperature too high
Reduce the temperature by cooling the
fluid
•
Mechanical seal damaged or worn out
Replace the seal
•
O-rings unsuitable for the fluid
Fit suitable O-rings. Consult the
manufacturer.
•
•
Stressed pipes
Connect the pipes to the pump so as to
avoid stress and align the coupling
•
•
•
•
Foreign matter in the fluid
Fit a filter to the suction pipe
•
The mechanical seal tension is too low
Adjust according the instructions of this
manual
•
Pump speed too low
Increase speed
•
•
Pump too small
Choose a larger pump size
•
•
•
The stator is worn out or has operated
in vacuum
Replace the stator
•
•
•
•
Pump and/or motor not attached to the
bedplate.
Attach the pump and/or motor and
check whether the pipes are connected
without stress
•
Flow reduction
Replace the worn stator
