New Approach in Steam Turbine Rotor Balancing Procedure

Abstract

Rotor balancing can be performed on a dedicated balancing machine or in-situ (field balancing). Machine balancing allows for precise mass correction, particularly for dynamic unbalance, but neglects field installation factors. Conversely, field balancing, conducted in the rotor's operational environment, accounts for these factors (e.g., bearing clearances, support stiffness), potentially resulting in improved vibration performance. This paper addresses a specialized challenge: balancing steam turbine rotors with low journal surface hardness. A novel method, utilizing a custom-designed detachable ring adapter to protect the journal during machine balancing, was developed. The design, application, measurement, and verification of this method are detailed.