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HP 8-ub-1 Manuale Utente

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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
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Impeller damaged or eroded.
Replace impeller and check reason.
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Leakage under sleeve due to joint failure.
Replace joint and check for damage.
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Mechanical seal improperly installed.
Check alignment of faces or damaged parts and
assembly method used.
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Incorrect type of mechanical seal for operating
conditions.
Consult Flowserve
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Shaft running off centre because of worn
bearings or misalignment.
Check misalignment and correct if necessary.
If alignment satisfactory check bearings for
excessive wear.
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Impeller out of balance resulting in vibration.
Check and consult Flowserve.
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Abrasive solids in liquid pumped.
Check and consult Flowserve.
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Mechanical seal was run dry.
Check mechanical seal condition and source of
dry running and repair.
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Internal misalignment due to improper repairs
causing impeller to rub.
Check method of assembly, possible damage or
state of cleanliness during assembly.
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z
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z
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Excessive thrust caused by a mechanical failure
inside the pump.
Check wear condition of impeller, its clearances
and liquid passages.
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Excessive grease in ball bearings.
Check method of regreasing.
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Lack of lubrication for bearings.
Check hours run since last change of lubricant,
the schedule and its basis.
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z
z z
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Improper installation of bearings.
Check method of assembly, possible damage or
state of cleanliness during assembly and type of
bearing used.
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z z
z
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Damaged bearings due to contamination.
Check contamination source and replace
damaged bearings.
C.  ELECTRICAL TROUBLES
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Wrong direction of rotation.
Reverse 2 phases on motor terminal box.
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Motor running too slow.
Check motor terminal box connections.