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Symptoms of a Poor Alignment

Proper Pump to Motor Alignment Techniques: Part 6 of 6

Proper Pump to Motor Alignment Techniques: Part 6 of 6

Symptoms of a Poor Alignment

While diagnosing a poor alignment during operation can be difficult, some modern condition monitoring tools can be employed to help.  Full spectrum vibration analysis, coupled with infrared thermography allows pump engineers to identify misalignment by measuring vibration signatures in radial and axial directions, while also evaluating the pump for any abnormal temperature gradients.

Other signs or symptoms of a poor alignment, that are easier to identify and do not require specialized analysis tools are:

  • Broken or loose foundation bolts/studs
  • Broken or loose coupling bolts
  • Loose dowel pins or shim packs
  • Broken shafting close to inboard bearings or coupling hubs
  • Hot running flexible couplings or powderized elastomeric coupling components
  • Excessive oil leaking from bearing seals
  • Excessive grease or oil inside coupling guards

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