Graham Corporation
24
5.8 Troubleshooting Chart
Problem Cause Solution
Reduced
Capacity
•
Speed too low
•
Leak in suction line
•
Service liquid temperature too high
•
Insufficient or excess service liquid
•
Excessive back pressure
•
Check power supply and transmission
•
Repair
•
Check coolant flow & heat exchanger
•
Provide correct flow rate
•
Eliminate cause of back pressure
Excessive
Noise
•
Excessive or insufficient service liquid
•
Shaft misalignment
•
Defective bearing
•
Cavitation
•
Back pressure
•
Adjust flow rate
•
Realign shafts
•
Replace bearing
•
Open attenuation valve or adjust vacuum
relief valve
•
Eliminate cause of back pressure
High Power
Consumption
•
Excessive service liquid
•
Shaft misalignment
•
Excessive back pressure
•
Defective bearing
•
Gland follower too tight
•
Improperly mounted pump
•
High temperature process load
•
Reduce flow rate
•
Realign shafts
•
Eliminate cause of back pressure
•
Replace bearing
•
Loosen gland follower
•
Make sure surface is level and all feet touch
the surface, shim if necessary.
•
Check conditions upstream of pump
Overheating
•
Service liquid temperature too high
•
Insufficient service liquid
•
Shaft misalignment
•
Defective bearing
•
Gland ring too tight
•
Check coolant flow & heat exchanger
•
Provide correct flow rate
•
Realign shafts
•
Replace bearing
•
Loosen gland ring, check packing coolant
flow
Vibration
•
Shaft misaligned
•
Pump or baseplate not properly anchored
•
Defective bearing
•
Improperly mounted pump
•
Cavitation
•
Back pressure
•
Excessive service liquid
•
Realign shafts
•
Anchor
•
Replace bearing
•
Make sure surface is level and all feet touch
the surface, shim if necessary.
•
Open attenuation valve or adjust vacuum
relief valve
•
Eliminate cause of back pressure
•
Provide correct flow rate
Excessive
Gland
Leakage
•
Worn packing
•
Loose gland
•
Gland coolant pressure too high
•
Replace packing
•
Tighten gland follower
•
Reduce pressure
Abnormal
Bearing Wear
or Failure
•
Shaft misalignment
•
Piping load on pump flange
•
Mechanical seal leakage
•
Shaft flinger missing
•
Realign shafts
•
Support connecting pipe work
•
Replace seals
•
Replace flinger
Shaft Will Not
Turn or
Partially
Seizes
•
Scale build-up
•
Foreign object in pump
•
Piping load on pump flange
•
Improperly mounted pump
•
Soft Foot
•
Descale pump
•
Remove foreign object
•
Support connecting pipe work
•
Make sure surface is level and all feet touch
the surface, shim if necessary.
•
Correct pump / motor mounting
Table 3
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