Turbine Rotors Whirl After Dynamically Stable Designs Are Updated
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The problem of steam turbine rotor whirling following uprating of a stable design and the measures taken to define the problem and implement a solution are described. Nearly identical units installed at several of Union Carbide's process plants exhibited different symptoms of minor instability after rerating. The newest unit, rerated before installation, began to exhibit signs of not-so-minor instability following a very stable and successful startup. The deceptive symptoms, temporary corrective action, final diagnosis of the problem, including field testing, are discussed.
Van Laningham, Fred L. (1977). Turbine Rotors Whirl After Dynamically Stable Designs Are Updated. Texas A&M University. Gas Turbine Laboratories. Available electronically from