Troubleshooting
INOXPA S.A.U.
·
01.030.30.05EN · (0) 2021/01
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
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Wrong direction of rotation
Reverse the direction of rotation
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NPSH is not high enough
Raise the suction tank
Lower the pump
Reduce the vapour pressure
Widen the diameter of the suction pipe
Shorten and simplify the suction line
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Pump not purged
Purge or fill
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Cavitation
Increase the suction pressure
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The pump sucks in air
Check the suction line and all of its
connections
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Suction pipe obstructed
Check the suction line and the filters, if
available
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Discharge pressure too high
If necessary, reduce load losses, e.g.
by increasing the diameter of the pipe
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Flow rate too high
Reduce the flow by means of a
diaphragm
Partially close the discharge valve
Trim the impeller
Decrease speed
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Fluid viscosity too high
Reduce the viscosity, e.g. by heating
the fluid
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Fluid temperature too high
Reduce the temperature by cooling the
fluid
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Mechanical seal damaged or worn out
Replace the seal
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O-rings unsuitable for the fluid
Fit suitable O-rings. Consult the
manufacturer.
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The impeller scrapes
Lower the temperature
Reduce the suction pressure
Adjust the impeller/cover play
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Tension in the lines
Connect the pipes to the pump without
tension
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Foreign matter in the liquid
Install a filter in the suction pipe
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Mechanical seal spring tension is too
low
Adjust as indicated iin this manual
