8 TROUBLE
-
SHOOTING AND
REMEDYING
PAGE
8.1
issued: 17.07.2017 Revision: 5
text no.
08000-2/2
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 x x x x
The stator material is brittle.
Fit a new stator. Check the liquid medium agrees
with order details; if necessary change the stator
material.
x x x x x
The rotor is worn out.
Change rotor, establish the cause. Wear and tear,
corrosion, cavitation; if necessary change to a
different material or coating.
x
The joints are worn out.
Replace relevant parts, carefully reseal and
lubricate.
x x
The pump and drive are not axially aligned. Re-align the unit.
x
The elastic element of the coupling is worn out. Use a new connection and re-align the pump.
x x
The roller bearings are destroyed.
Replace roller bearings, lubricate, reseal. At higher
temperatures observe the lubricant and the bearings.
x
The rpm is too high.
In the case of adjustable drives : lower the rpm. If
necessary change the drive.
x
The viscosity is too high.
Measure the viscosity and compare with order
details. If necessary adjust viscosity or change the
drive.
x
The specific weight of the medium is too high.
Measure specific weight and compare with order
details. If necessary adjust specific weight or change
the drive.
x x
The stuffing box is incorrectly tightened.
Service stuffing box according to page 7.4, if
necessary renew worn shaft.
x
The packing is not suited to the liquid medium. Replace fitted packing with another packing type.
x x
Mechanical seal: rotation is incorrect. Change electrical connection.
x
Mechanical seal: mechanical seal and mating ring
have failed.
Replace relevant rings with new ones.
x
Mechanical seal: elastomers damaged, swollen or
brittle.
Replace elastomers. Check whether the liquid
medium agrees with order details, if necessary
change material.
IPP - EN - EN_08000_20170712/3 - D8411276 - 4300003998 - 000100 - NPS - 00229929 N 2018-02-21 19:03:25
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