8 TROUBLE
-
SHOOTING AND
REMEDYING
PAGE
8.0R
text no.
R 08000-1/2
issued: 17.07.2017 Revision: 5
copy to:
Possible Problems
Possible Causes Remedy
The pump is no longer starting
The pump is no longer sucking
The pumped medium is too little
The pressure is too low
The pumped medium is unstable
The pump is running loudly
The pump is stuck
The drive is overloaded
The stator life time is too short
The rotor life time is too short
The shaft seal is leaking
x x
In new pumps or stators:
the static friction is too great.
Fill the pump up, then pump through manually using
a suitable appliance; if necessary use glycerine as
lubricant in the stator.
x x x x
The pump electrical equipment is not compatible
with the electrical supply..
Check order information. Examine electrical
installation (possibly 2 phase operation).
x x x x
The pressure is too high.
Measure the pressure with a manometer and check
against order details. Reduce the pressure or
change the drive.
x x x
There are foreign bodies in the pump.
Remove foreign bodies and eliminate possible
damage.
x x x x x
The temperature of the liquid medium is too high,
the stator is too ductile.
If the liquid medium temperature cannot be lowered,
use a reduced diameter rotor.
x x x x
The stator has swollen, the elastomer is not
compatible with the medium.
Check whether the liquid medium agrees with the
order requirements. Possibly change stator material.
x x x x
The solids content of the medium is too high and
leads to blockages.
Increase the liquid part of the medium.
x x x x x x
The liquid medium sediments or hardens when left
to stand.
Clean the pump and rinse through after each run.
x x x
There is air in the suction pipe.
Increase the suction liquid level, prevent turbulance
and air bubbles at the inlet.
x x x x
The suction pipe is leaking. Check seals and tighten pipe connections.
x x x x
The shaft seal is leaking.
Stuffing box: tighten or renew. Mechanical seal:
renew seals, eliminate solid deposits.
x x
The rpm is too low.
In the case of adjustable drives: increase the rpm. If
necessary change the drive.
x x x
With reduced diameter rotors: operating
temperature has not been reached.
Pumpe (Stator) erst auf Betriebstemperatur
erwärmen.Warm up the pump (stator) to operating
temperature first of all.
x x x x x x
The suction is too great or pressure too low
(cavitation).
Decrease suction resistance, lower the temperature
of the liquid medium, install the pump at a lower
location.
x x x x x x
The pump is running dry.
Fill up the pump, provide for dry running protection,
move the pipes.
x x x x
The stator is worn out. Replace with a new stator.
IPP - EN - EN_08000_20170712/2 - D8411276 - 4300003998 - 000100 - NPS - 00229929 N 2018-02-21 19:03:25
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