Symptom
Cause
Remedy
Density and/or viscosity of liquid han-
dled is too high
Seek assistance
Head too high
Speed too high
•
Reduce speed
•
Compare speed of motor with
specified pump speed (rating
plate)
•
When adjusting speed (frequen-
cy transformer) check reference
value setting
Impeller diameter too big
Use smaller impeller
Drive mechanism overloaded
Back-pressure too low, discharge too
low
Throttle discharge valve
Speed too high
•
Reduce speed
•
Compare speed of motor with
specified pump speed (rating
plate)
•
When adjusting speed (frequen-
cy transformer) check reference
value setting
Impeller diameter too big
Use smaller impeller
Density and/or viscosity of liquid han-
dled is too high
Seek assistance
Stuffing box not straight
Tighten evenly
Forces in pipeline too high (pump unit
under strain)
•
Change (support pipes, use
compensator’s, etc.)
•
Is foundation plate/frame proper-
ly cast in place?
Electricity supply not right (2-phase
running)
•
Check voltage of all phases
•
Check cable connections and
fuses
Pump not running quietly
Flow too little
Increase min. flow (open discharge
valve, bypass)
Pump and/or pipes not completely fil-
led with liquid
•
Fill
•
Vent
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)
Inner components suffering from wear Replace worn parts
Impeller out of balance
•
Remove blocks/deposits
•
Replace impeller if broken or un-
evenly worn
•
Check shafts to ensure that they
are running true
Coupling not aligned
Align pump unit better
Coupling distance too small
Change
Forces in pipeline too high (pump unit
under strain)
•
Change (support pipes, use
compensator’s, etc.)
•
Is foundation plate/frame proper-
ly cast in place?
8.1 Operation troubleshooting
46
Model ICP, ICPI, ICPH, ICPIH Installation, Operation and Maintenance Instruction
Содержание Goulds Pumps ICP
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