Flowserve LNGT Manual do Utilizador descarregar pdf (Página 38)

LNGT USER INSTRUCTIONS ENGLISH 00083107 02-08

Page 38 of 48

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

z z z z z

Shaft bent.

Check shaft runouts are within acceptable values.

CONSULT FLOWSERVE.

z z z

Rotating part rubbing on stationary part internally. Check and CONSULT FLOWSERVE, if necessary.

z z z z z

Bearings worn. Replace bearings.

z z

Wearing ring surfaces worn. Replace worn wear ring/surfaces.

z z

Impeller damaged or eroded. Replace or CONSULT FLOWSERVE for improved

material selection.

Leakage under sleeve due to joint failure. Replace joint and check for damage.

z z

Shaft sleeve worn or scored or running off centre. Check and renew defective parts.

z z z

Mechanical seal improperly installed. Check alignment of faces or damaged parts and

assembly method used.

z z z

Incorrect type of mechanical seal for operating

conditions.

CONSULT FLOWSERVE.

z z z z z

Shaft running off centre because of worn bearings

or misalignment.

Check misalignment and correct if necessary. If

alignment satisfactory check bearings for excessive

wear.

z z z z z

Impeller out of balance resulting in vibration.

z z z

Abrasive solids in liquid pumped.

z z

Internal misalignment of parts preventing seal ring

and seat from mating properly.

Check and CONSULT FLOWSERVE.

z z

Mechanical seal was run dry. Check mechanical seal condition and source of dry

running and repair.

z z

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.

z z z

Excessive thrust caused by a mechanical failure

inside the pump.

Check wear condition of impeller, its clearances and

liquid passages.

z z

Excessive grease in ball bearings. Check method of regreasing.

z z

Lack of lubrication for bearings. Check hours run since last change of lubricant, the

schedule and its basis.

z z

Improper installation of bearings [damage during

assembly, incorrect assembly, wrong type of

bearing etc].

Check method of assembly, possible damage or

state of cleanliness during assembly and type of

bearing used. Remedy or CONSULT

FLOWSERVE, if necessary.

z z

Damaged bearings due to contamination. Check contamination source and replace damaged

bearings.

C. MOTOR ELECTRICAL PROBLEMS

z z

Wrong direction of rotation. Reverse 2 phases at motor terminal box.

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Flowserve LNGT Manual do Utilizador Página 38

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