Correct size, roundness, concentricity and surface finish of rotor journals are critical to the proper operation of a rotor. Some typical defects that occur in damaged rotor journals include pitting, presence of grooves, presence of hard areas, cracks from overheating, deposit of babbitt from the bearing and uneven wear. These imperfections can impair the proper lubrication of the journal, creating a higher probability of additional journal damage progressing and leading to failure, including a forced outage.
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