Flowserve LR Worthington - Manual (Page 35)

LR, LRV, LLR and LR-S USER INSTRUCTIONS ENGLISH 71569088 08-10
Page 35 of 48 flowserve.com
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
B. MECHANICAL TROUBLES
Misalignment due to pipe strain.
Check the flange connections and eliminate
strains using elastic couplings or a method
permitted.
Improperly designed foundation.
Check setting of baseplate: tighten, adjust, grout
base as required.
Shaft bent. Check shaft runouts within acceptable values.
Rotating part rubbing on stationary part internally.
Check for signs of this and consult Flowserve if
necessary.
Bearings worn Replace bearings.
Wearing ring surfaces worn. Replace worn wear ring/surfaces.
Impeller damaged or eroded. Replace impeller and check reason.
Leakage under sleeve due to joint failure. Replace joint and check for damage.
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 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.
Abrasive solids in liquid pumped. Check and consult Flowserve.
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.
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.
Check method of assembly, possible damage or
state of cleanliness during assembly and type of
bearing used.
Damaged bearings due to contamination.
Check contamination source and replace
damaged bearings.
C. ELECTRICAL TROUBLES
Wrong direction of rotation. Reverse 2 phases on motor terminal box.
Motor running too slow. Check motor terminal box connections.