Symptom
Cause
Remedy
Density and/or viscosity of liquid han-
dled is too high
Seek assistance
Discharge stops after a time
Flow too little
Increase min. flow (open discharge
valve, bypass)
Pump or suction/intake pipe blocked
Clean
Suction height too big / NPSH of sys-
tem too small
•
Increase liquid level and admis-
sion pressure
•
Reduce resistance in the intake/
suction pipe (change course and
rated width, open shut-off valves,
clean filters)
Air being sucked in
•
Increase liquid level
•
Check if suction pipe is vacuum-
tight
Air being sucked in through shaft seal-
ing
•
Clean sealing pipe
•
Increase sealing pressure
•
Replace shaft sealing
Head too low
Back-pressure too low, discharge too
low
Throttle discharge valve
Speed too low
•
Increase speed (check available
motor power)
•
Compare speed of motor with
specified pump speed (rating
plate)
•
When adjusting speed (frequen-
cy transformer) check reference
value settings
Flow too little
Increase min. flow (open discharge
valve, bypass)
Impeller diameter too small
Use larger impeller (check available
motor power)
Pump and/or pipes not completely fil-
led with liquid
•
Fill
•
Vent
Pump or suction/intake pipe blocked
Clean
Air pocket in pipeline
•
Vent
•
Improve course of pipe
Suction height too big / NPSH of sys-
tem too small
•
Increase liquid level and admis-
sion pressure
•
Reduce resistance in the intake/
suction pipe (change course and
rated width, open shut-off valves,
clean filters)
Air being sucked in
•
Increase liquid level
•
Check if suction pipe is vacuum-
tight
Air being sucked in through shaft seal-
ing
•
Clean sealing pipe
•
Increase sealing pressure
•
Replace shaft sealing
Direction of rotation is wrong
Swap over two phases of power supply
(to be done by an electrician)
Inner components suffering from wear Replace worn parts
8.1 Operation troubleshooting
Model ICP, ICPI, ICPH, ICPIH Installation, Operation and Maintenance Instruction
45
Содержание Goulds Pumps ICP
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