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Trouble shooting
Reverse the terminal
connection on electric motor.
Connecting and discon-
necting of electric cables
must be done only by
personnel authorized to
do such work.
See above.
Check all components
in suction line. The inlet
condition should be checked
with a vacuum gauge at the
pump inlet.
Check the suction line.
See the chapter on Deaera-
tion (see page 5).
See above.
Readjust the pressure relief
valve to a value above
counter pressure.
Readjust the pressure relief
valve.
Check all components in the
suction line (strainers, valves
etc.).
See the chapter on Noise
and Vibration. ( Page 11).
Readjust the pressure relief
valve.
Check the components in the
discharge line inclusive the
recipients.
Check the valve. See
Maintenance and Service
instruction for respective
pump.
Check all components in the
suction line (strainers, valves
etc.).
See the chapter on Noise
and Vibration. ( Page 11).
Contact your IMO AB
representa tive.
- Electric cables to motor
wrongly connected.
- Wrong direction of rotation.
- Suction line is not open or
pressure drop in the suction
line is too high.
- Major air leakage into the
suction line.
- The pump cannot evacuate
the air through the discharge
line due to excessive counter
pressure.
- The pump is not primed.
- The pressure relief valve is set
below the counter pressure.
- The pressure relief valve is set
too low (Discharge pressure
also low).
- Something is restricting the
flow in the suction line. (This
would usually cause noise).
- The pumped liquid contains
a significant amount of com-
pressible gas, such as free
air. (This would usually cause
noise).
- The pressure relief valve is set
too low.
- Counter pressure in the
discharge line is too low due to
a major leakage.
- The valve piston is stuck in
open position.
- Something is restricting the
flow in the suction line. (This
would usually cause noise).
- The pumped liquid contains
a significant amount of com
-
-pressible gas, such as free
air. (This would usually cause
noise).
- A too small pump has been
chosen.
Wrong direction of rotation
What to do
Problem
Cause
No flow
Flow too low
Pressure too low
The pump cannot be primed
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