DESMI Pumping Technology A/S
11
Tagholm 1
9400 Nørresundby - Denmark
Tel.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail:
FAULT
CAUSE
REMEDY
The pump has no or
too low capacity
1. Wrong direction of
rotation
2. Piping system choked
3. The pump is choked
4. Suction line leaks
Pump takes air
5. Suction lift too high
6. Pump and piping
system wrongly
dimensioned
Change direction of
rotation to clockwise when
viewed from shaft end (the
direction of the arrow)
Clean or replace
Clean the pump
Find the leakage, repair
the fault, non-return valve
not submerged
Check data sheet Q/H
curve and NPSH or contact
DESMI
As 5
The pump uses too
much power
1. Counter-pressure too
low
2. The liquid is heavier
than water
3. Foreign body in pump
4. Electric motor is
running on 2 phases
Insert orifice plate or check
valve/Contact DESMI
Contact DESMI
Dismantle the pump,
remove the cause
Check fuses, cable
connection, and cable
The pump makes
noise
1. Cavitation in pump
Suction lift too high/
Suction line wrongly
dimensioned/Liquid
temperature too high
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