Flowserve MN - Manual (Page 45)

MN USER INSTRUCTIONS ENGLISH 71569189 11/04
Page 45 of 49
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FAULT SYMPTOM
P u m p o ve r h e a ts a n d s e iz e s
⇓ ⇓ B e a r i n g s h ave s h o r t l i f e
⇓ ⇓ P u m p vi b r a t e s o r i s n o i sy
⇓ ⇓ M e c h a n i c al s e a l / G l a n d pa c k i n g h a s sh o r t l i f e
⇓ ⇓ M e c h a n i c al s e a l / G l a n d le a k s e xc e s s ive l y
⇓ ⇓ P u m p r e q u i re s e x c es s i ve p ow e r
⇓ ⇓ P u m p l o s e s p r i m e a ft e r sta r t i n g
⇓ ⇓ I n s u f f i c i e n t d i s c h a r g e pre s s u r e d e ve l o p e d
⇓ ⇓ I n s u f f i c i e n t c a pa c i t y d e l i ve r e d
⇓ ⇓ P u m p d o e s no t d e l i ve r l i q u i d
⇓ ⇓
PROBABLE CAUSES POSSIBLE REMEDIES
Wearing ring surfaces worn. Replace worn wearing ring.
Impeller damaged or eroded. Replace or call Flowserve for improved material
selection.
Leakage under sleeve due to joint failure. Check for damage and replace joint.
Shaft sleeve worn or scored or running off center. Check and renew defective parts.
Mechanical seal /Gland packing improperly
installed.
Check alignment of faces or damaged parts and
assembly method used.
Incorrect type of mechanical seal/packing for the
given operating conditions.
Call Flowserve Service Center.
Shaft running off center because of worn bearings
or misalignment.
Check misalignment and /or for excessive bearing
wear.
Impeller out of balance resulting in vibration.
Abrasive solids in liquid pumped.
Internal misalignment of parts preventing seal ring
and seat from mating properly.
Check and call Flowserve.
Mechanical seal / Gland packing was run dry Check mechanical seal/packing condition and source
of dry running and repair.
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 re-greasing.
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
cleanliness during assembly and type of bearing
used. 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.