| TROUBLE |
POSSIBLE CAUSE |
REMEDY |
| Vibrations or abnormal compressor noise |
Misalignment |
Remove coupling. Have driver run by itself. If it rotates without vibrations, the trouble could be caused by misalignment. To check alignment, refer to instruction book. |
| Coupling failure |
Check condition of coupling |
| Compressor rotor unbalance |
Check to see if dirt is the cause, and, if necessary, rebalance |
| Bearings worn out from dirt in the oil |
Check bearings and, if necessary, replace |
| Stresses transmitted by gas pipes to casing resulting in misalignment |
Gas pipes should be properly anchored down to prevent excessive stresses on compressor casing. Sufficient elasticity should be given to gas pipes to allow for heat expansion |
| Unbalanced coupling |
Disassemble coupling and check for unbalance |
| Surge |
See that compressor operating conditions are kept far from surge point |
| Machines working in the vicinity of compressor |
Insulate their foundations and increase elasticity of any connecting pipes |
| Thrust bearing failure |
Excessive axial thrust |
Make sure coupling is clean and assembled so that exces- sive thrust is not transmit- ted from the coupled driver to the compressor |
| Improper lubrication |
Refer to section "Journal Bearing Failure" |
| Oil seal ring failure |
Misalignment and vibrations |
Refer to sections on vibrations |
| Dirty oil |
Check condition of filter and replace dirty cartridges. Check pipe cleanliness. |
| Ring clearance incorrect |
Check clearance and, if necessary, correct. ‘ |
| Insufficient oil pressure |
Check that the reference gas pressure does not drop below minimum. |
| Bearing failure |
Improper lubrication |
Make sure recommended oil is used. Periodically check that there is no water or dirt in the oil |
| Misalignment |
Check alignment and, if necessary, correct. |
| Bearing clearance incorrect |
Check clearance and, if necessary, correct. |
| Compressor or coupling unbalance |
Refer to sections on vibrations. |
