Flowserve Worthington WXB - Manual (Page 47)

WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 47 of 51
FAULT SYMPTOM
Pump overheats and seizes
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Bearings have short life
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Pump vibrates or is noisy
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Mechanical seal has short life
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Mechanical seal leaks excessively
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Pump requires excessive power
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Pump loses prime after starting
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Insufficient pressure developed
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Insufficient capacity delivered
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ Pump does not deliver liquid
⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ ⇓ PROBABLE CAUSES POSSIBLE REMEDIES
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 satisfactotry 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