Andritz MC - Operating Malfunctions and Troubleshooting

Medium-consistency pump MC
STANDARD, C-01-000000
Rev. 0, 2010.02.09 OPERATION Kap.6 , Seite 8 of 12
GRZ-2698572-v1-Operation.FM
6.9 Operating malfunctions and troubleshooting
Malfunction Possible cause Remedy
Pump is not pumping
medium
Filling level in stand pipe is too
low
Correct filling level (increase)
Suction pipe, suction valve or
impeller are clogged
Check the suction pipe and
the entire pump for clogging
Speed too low Check the speed requirements
Flow resistance in the pipe is
greater than the delivery head
generated at the pump
Check the resistance in the
pipe
Delivery-side valve closed Open valve
Feed to stand pipe Check feed to stand pipe
Blockage in delivery pipe Flush out delivery pipe
Blockage in stand pipe Flush out stand pipe
Inadequate or irregular flow
rate
Level in stand pipe too low
(vortices may form)
Correct filling level (increase)
Wrong sense of rotation /
speed (centrifugal pump
motor)
Change/correct sense of
rotation/ speed of motor.
Unexpectedly high
consistency in the medium to
be pumped
Check dilution water supply
Blockage in delivery pipe Flush out delivery pipe
Blockage in stand pipe Flush out stand pipe
Delivery side valve is throttled Open valve
Flow resistance in the pipe is
greater than the delivery head
generated at the pump
Check the resistance in the
pipe
Pump parts coming into
contact with pressure are
worn, damaged or clogged
Check the pump and change
any worn or damaged parts if
necessary
Blockage in degassing line Flush degassing line
Tab. 6-7 Operating malfunctions and troubleshooting