Core Component Assessment: The Second-Hand Turbine Rotor
Release time:
2026-04-09
Source:
The rotor is the most valuable and critical part of any second-hand steam or gas turbine. This article describes essential inspection steps, including non-destructive testing of journals, blade attachments, and bore areas. A sound rotor can enable a complete turbine refurbishment at low cost.
The rotor converts thermal energy into mechanical work, and its condition determines whether a second-hand turbine is worth purchasing. Inspection begins with visual checks of all blade attachment grooves (fir tree or T-shaped). Corrosion or fretting in grooves often indicates inadequate maintenance. Next, measure journal diameters and roundness. Wear exceeding 0.05 mm requires grinding and undersized bearing replacement.
Non-destructive testing (magnetic particle or ultrasonic) is mandatory for the shaft surface and critical fillets. For high-speed rotors, bore inspection using ultrasonic or eddy current reveals internal inclusions. If the rotor has been balanced before, review the balance records. Sudden addition of large correction weights suggests distortion or blade loss.
Thrust collars and coupling faces must be parallel and free of galling. A rotor that passes all NDT and dimensional checks can be reused after cleaning and new blade installation. However, any crack deeper than 1 mm in the shaft body makes the rotor unsafe. Always combine a second-hand rotor with new bearings and seals for optimal reliability.
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