Flowserve CPXS User Manual
Page 33
CPXS, CPXNS and CPXPS USER INSTRUCTIONS ENGLISH 71569250 07-11
Page 33 of 48
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FAULT SYMPTOM
P u m p o v e r h e a t s a n d s e i z e s
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B e a r i n g s h a v e s h o r t l i f e
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P u m p v i b r a t e s o r i s n o i s y
P u m p r e q u i r e s e x c e s s i v e p o w e r
P u m p l o s e s p r i m e a ft e r s t a r t i n g
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I n s u f f i c i e n t p r e s s u r e d e v e l o p e d
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I n s u f f i c i e n t c a p a c i t y d e l i v e r e d
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P u m p d o e s n o t d e l i v e r l i q u i d
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POSSIBLE CAUSES
POSSIBLE REMEDIES
Rotating part rubbing on stationary part internally.
Check and CONSULT FLOWSERVE, if necessary.
Bearings worn.
Replace bearings.
Wearing ring surfaces worn.
Replace worn wear ring/surfaces.
Impeller damaged or eroded.
Replace or CONSULT FLOWSERVE for improved
material selection.
Shell O-ring/casing gasket failure.
Replace with care or CONSULT FLOWSERVE for
improved material selection.
Magnetic coupling de-coupled.
CONSULT FLOWSERVE to determine the cause.
Shell corroded/eroded through
Replace or CONSULT FLOWSERVE for improved
material selection.
Shaft running off centre because of worn bearings
or misalignment.
Check misalignment and correct if necessary. If
alignment satisfactory check bearings for excessive
wear.
Impeller out of balance resulting in vibration.
Check and CONSULT FLOWSERVE.
Pump was run dry.
Improve control on pump to prevent recurrence or
CONSULT FLOWSERVE for advice.
Internal misalignment due to improper repairs
causing impeller to rub.
Check method of assembly, possible damage or
state of cleanliness during assembly.
Remedy or CONSULT FLOWSERVE, if necessary.
Excessive thrust caused by a mechanical failure
inside the pump.
Check wear condition of impeller, its clearances and
liquid passages.
Excessive grease in ball bearings.
Check method of regreasing.
Lack of lubrication for bearings.
Check hours run since last change of lubricant, the
schedule and its basis.
Improper installation of bearings (damage during
assembly, incorrect assembly, wrong type of
bearing etc).
Check method of assembly, possible damage or
state of cleanliness during assembly and type of
bearing used. Remedy or CONSULT
FLOWSERVE, if necessary.
Damaged bearings due to contamination.
Check contamination source and replace damaged
bearings.
C. Motor electrical problems
Wrong direction of rotation.
Reverse 2 phases at motor terminal box.
Motor running on 2 phases only.
Check supply and fuses.
Motor running too slow.
Check motor terminal box connections and voltage.