Flowserve MPT - Manual (Page 26)

MPT USER INSTRUCTIONS ENGLISH 85392699 06-09
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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
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