Flowserve Mark 3 ISO Durco - Manual (Page 26)

DURCO MARK 3 ISO CLOSE COUPLED ENGLISH 26999985 02-14
Page 26 of 32
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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
  B e a r i n g s h a v e s h o r t l i f e
  P u m p v i b r a t e s o r i s n o i s y
  M e c h a n i c a l s e a l h a s s h o r t l i f e
  M e c h a n i c a l s e a l l e a k s e x c e s s i v e l 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
  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
  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
  P u m p d o e s n o t d e l i v e r l i q u i d
 
PROBABLE CAUSES POSSIBLE REMEDIES
    Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.
     Bearings worn Replace bearings.
   Impeller damaged or eroded.
Replace or CONSULT FLOWSERVE for improved
material selection.
  Stub shaft worn or scored or running off center. Check and renew defective parts.
   Mechanical seal improperly installed.
Check alignment of faces or damaged parts and
assembly method used.
  
Incorrect type of mechanical seal for operating
conditions.
CONSULT FLOWSERVE.
     Shaft running off center 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.
   Abrasive solids in liquid pumped.
 
Internal misalignment of parts preventing seal ring
and seat from mating properly.
  Mechanical seal was run dry.
Check mechanical seal 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.
  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.
   Motor incorrectly wired. Check motor terminal box connections, refer to
motor instructions.