Flowserve DMX - Manual (Page 48)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09
Page 48 of 60
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
Shaft bent (excessive runout) Check shaft runouts are within acceptable values.
CONSULT FLOWSERVE.
Rotating part rubbing on stationary part
internally. Check and CONSULT FLOWSERVE, if necessary
Bearings worn Replace bearings.
Wearing ring surfaces worn. Replace worn wear ring/ surfaces
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
Shaft sleeve worn or scored or running off
center. Check and replace defective parts.
Mechanical seal improperly installed. Check alignment of faces or damaged parts and assembly
method used. Refer to mechanical seal instructions.
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.
Mechanical seal was run dry. Check mechanical seal condition and source of dry running
and repair.
Excessive thrust caused by a mechanical
failure inside the pump. Check wear condition of Impeller, its clearances and liquid
passages.
Lack of lubrication for bearings. Check hours run since last change of lubricant. Check oil
level and add if necessary.
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.
Damaged bearings due to contamination. Check contamination source and replace damaged
bearings
Rotating assembly out of balance. Check balance, runouts, balance as required.
CONSULT FLOWSERVE.
Coupling out of balance Check for missing parts or damage.
CONSULT FLOWSERVE.
Cavitation Check pump is primed, check for obstruction in suction line.
C. ELECTRICAL TROUBLES
Wrong direction of rotation. Reverse 2 phases on motor terminal box.
Motor running on 2 phases only. Check supply and fuses.
Motor running too slow. Check motor terminal box connections and voltage.