Flowserve MPT User Manual

Page 26

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MPT USER INSTRUCTIONS ENGLISH 85392699 06-09

26 of 41

®

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


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