35
KM70
ENG_DEBEM S.r.l.
Rev. 01A-EN
01/03/2021
A
B
C
D
E
F
Possible cause
Solution
X
X
X
X
X
Rotating parts worn (bearings/
seal faces/wear rings)
Replace worn parts with new
parts
X
X
Backflush pressure of the pump
lower than the value in the data
sheet. No head on delivery
Adjust the working point again. In
case of permanent overload, de-
crease the impeller diameter.
X
X
X
Density and viscosity of the
pumped liquid too high compared
with the values in the data sheet
Contact DEBEM S.r.l.
X
X
Worn gaskets in the volute casing
or flanges
Replace the gaskets of the volute
casing or connections.
X
X
X
X
Pipes cause mechanical stress on
the pump, or vibrations in the
pipes
Check the pump is installed cor-
rectly, so as not to be mechani-
cally strained, and check the
alignment. Support the pipes
properly
X
The impeller is not properly
balanced
Balance and/or clean the impeller
X
Loose connecting bolts and
screws
Check the bolts and screws are
tightened periodically
X
Liquid temperature not compliant
with data sheet or contractual
documentation
Check the temperature of the
pump/pumped liquid.
Contact
DEBEM S.r.l.
X
Use of unsuitable materials
Change the combination of mate-
rials. Contact DEBEM S.r.l.
X
No coolant or dirty flushing liquid
Increase flushing. Clean/purify
the flushing liquid
X
X
X
Air in the pumped liquid due to a
low level of liquid at suction
Increase the level of liquid at suc-
tion and keep it as constant as
possible
X
X
X
Pump running without liquid (dry
run)
Stop the pump and check the in-
ternal components are not dam-
aged
X
X
Foreign bodies in the pump
Check and clean the pump
