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HP 8-UB-1 User Manual

Page 28

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UB USER INSTRUCTIONS ENGLISH 71569247 07-04

Page 28 of 32

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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

⇓⇓⇓⇓

⇓⇓⇓⇓ Bearings have sh ort life

⇓⇓⇓⇓

⇓⇓⇓⇓ Pump vibrates or is nois y

⇓⇓⇓⇓

⇓⇓⇓⇓ M echanical seal has short life

⇓⇓⇓⇓

⇓⇓⇓⇓ M echanical seal leaks excessi vel y

⇓⇓⇓⇓

⇓⇓⇓⇓ Pump requires excessive power

⇓⇓⇓⇓

⇓⇓⇓⇓ Pump loses prime after star ting

⇓⇓⇓⇓

⇓⇓⇓⇓ Insuffi cien t pressure developed

⇓⇓⇓⇓

⇓⇓⇓⇓ Insuffi cien t cap aci t y delivered

⇓⇓⇓⇓

⇓⇓⇓⇓ Pump does not deliver liquid

⇓⇓⇓⇓

⇓⇓⇓⇓

PROBABLE CAUSES

POSSIBLE REMEDIES

z

z

z

z

z

z

z

z z

z

z

z

Impeller damaged or eroded.

Replace impeller and check reason.

z

z

z

z

Leakage under sleeve due to joint failure.

Replace joint and check for damage.

z

z

z

z z

z

z

z z

z

z

z

Mechanical seal improperly installed.

Check alignment of faces or damaged parts and
assembly method used.

z

z

z

z z

z

z

z z

z

z

z

Incorrect type of mechanical seal for operating
conditions.

Consult Flowserve

z

z

z

z z

z

z

z z

z

z

z z

z

z

z z

z

z

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

z

z

z z

z

z

z z

z

z

z

Impeller out of balance resulting in vibration.

Check and consult Flowserve.

z

z

z

z z

z

z

z z

z

z

z

Abrasive solids in liquid pumped.

Check and consult Flowserve.

z

z

z

z z

z

z

z

Mechanical seal was run dry.

Check mechanical seal condition and source of
dry running and repair.

z

z

z

z z

z

z

z z

z

z

z z

z

z

z z

z

z

z z

z

z

z

Internal misalignment due to improper repairs
causing impeller to rub.

Check method of assembly, possible damage or
state of cleanliness during assembly.

z

z

z

z z

z

z

z z

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

z

z z

z

z

z

Excessive grease in ball bearings.

Check method of regreasing.

z

z

z

z z

z

z

z

Lack of lubrication for bearings.

Check hours run since last change of lubricant,
the schedule and its basis.

z

z

z

z z

z

z

z

Improper installation of bearings.

Check method of assembly, possible damage or
state of cleanliness during assembly and type of
bearing used.

z

z

z

z z

z

z

z

Damaged bearings due to contamination.

Check contamination source and replace
damaged bearings.

C. ELECTRICAL TROUBLES

z

z

z

z

z

z

z

z

z

z

z

z z

z

z

z

Wrong direction of rotation.

Reverse 2 phases on motor terminal box.

z

z

z

z

z

z

z

z z

z

z

z

Motor running too slow.

Check motor terminal box connections.