Flowserve M-series PolyChem - Manual (Page 53)

USER INSTRUCTIONS PolyChem M-SERIES ENGLISH 71569218 07-11
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Page 53 of 60
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Pump not reaching design flow rate
  Pump not reaching design head (TDH)
  No discharge or flow with pump running
  Pump operates for short period, then loses prime
 
Excessive noise from wet end
 
Excessive noise from power end
 
Pump exhibits increased or higher than anticipated power consumption
 
Pump exhibits decreased or lower than anticipated power consumption
  PROBABLE CAUSES POSSIBLE REMEDIES
  Bearing contamination appearing on
the raceways as scoring, pitting,
scratching or rusting caused by
adverse environment and entrance of
abrasive contaminants from
atmosphere.
1. Work with clean tools in clean surroundings.
2. Remove all outside dirt from housing before exposing bearings.
3. Handle with clean dry hands.
4. Treat a used bearing as carefully as a new one.
5. Use clean solvent and flushing oil.
6. Protect disassembled bearing from dirt and moisture.
7. Keep bearings wrapped in paper or clean cloth while not in use.
8. Clean inside of housing before replacing bearings.
9. Check oil seals and replace as required.
10. Check all plugs and tapped openings to make sure that they are
tight.
 
Brinelling of bearing identified by
indentation on the ball races, usually
caused by incorrectly applied forces
in assembling the bearing or by
shock loading such as hitting the
bearing or drive shaft with a hammer.
When mounting the bearing on the drive shaft use a proper size ring and
apply the pressure against the inner ring only. Be sure when mounting a
bearing to apply the mounting pressure slowly and evenly.
 
False brinelling of bearing identified
again by either axial or
circumferential indentations usually
caused by vibration of the balls
between the races in a stationary
bearing. 1. Correct the source of vibration.
2. Where bearings are oil lubricated and employed in units that may be
out of service for extended periods, the drive shaft should be turned over
periodically to relubricate all bearing surfaces at intervals of one to three
months.
 
Thrust overload on bearing identified
by flaking ball path on one side of the
outer race or in the case of maximum
capacity bearings, may appear as a
spalling of the races in the vicinity of
the loading slot. (Please note:
maximum capacity bearings are not
recommended) These thrust failures
are caused by improper mounting of
the bearing or excessive thrust loads.
Follow correct mounting procedures for bearings.
 
Misalignment identified by fracture of
ball retainer or a wide ball path on
the inner race and a narrower cocked
ball path on the outer race.
Misalignment is caused by poor
mounting practices or defective drive
shaft. For example, bearing not
square with the centerline or possibly
a bent shaft due to improper
handling.
Handle parts carefully and follow recommended mounting procedures.
Check all parts for proper fit and alignment.
 
Bearing damaged by electric arcing
identified as electro- etching of both
inner and outer ring as a pitting or
cratering. Electrical arcing is caused
by a static electrical charge
emanating from belt drives, electrical
leakage or short circuiting. 1. Where current shunting through the bearing cannot be corrected, a
shunt in the form of a slip ring assembly should be incorporated.
2. Check all wiring, insulation and rotor windings to be sure that they are
sound and all connections are properly made.
3. Where pumps are belt driven, consider the elimination of static
charges by proper grounding or consider belt material that is less
generative.