Flowserve FRBH - Manual (Page 43)

FRBH, FRBHX AND FRBHS USER INSTRUCTIONS ENGLISH 71569178 10-04
Page 43 of 54
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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 f t 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
l l l l l l Misalignment due to pipe strain.
Check the flange connections and eliminate strains
using elastic couplings or a method permitted.
l
Improperly designed foundation. Check setting of baseplate: tighten, adjust, grout
base as required.
l l l l l Shaft bent.
Check shaft runouts are within acceptable values.
CONSULT FLOWSERVE.
l l l l Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.
l l l l l Bearings worn Replace bearings.
l l l Wearing ring surfaces worn. Replace worn wear ring/surfaces.
l l l Impeller damaged or eroded.
Replace or CONSULT FLOWSERVE for improved
material selection.
l Leakage under sleeve due to joint failure. Replace joint and check for damage.
l l Shaft sleeve worn or scored or running off centre. Check and renew defective parts.
l l l Mechanical seal improperly installed.
Check alignment of faces or damaged parts and
assembly method used.
l l l Incorrect type of mechanical seal for operating
conditions.
CONSULT FLOWSERVE.
l l l l l Shaft running off centre because of worn bearings
or misalignment.
Check misalignment and correct if necessary. If
alignment satisfactory check bearings for excessive
wear.
l l l l l Impeller out of balance resulting in vibration.
l l l Abrasive solids in liquid pumped.
l l Internal misalignment of parts preventing seal ring
and seat from mating properly.
Check and CONSULT FLOWSERVE.
l l Mechanical seal was run dry.
Check mechanical seal condition and source of dry
running and repair.
l l 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.
l l l
Excessive thrust caused by a mechanical failure
inside the pump. Check wear condition of impeller, its clearances and
liquid passages.
l l Excessive grease in ball bearings. Check method of regreasing.
l l
Lack of lubrication for bearings. Check hours run since last change of lubricant, the
schedule and its basis.