1.

Do You Think That Turbine Blade Failure Is The Only Cause Of Unreliability Of Steam Turbines? Does Upgrading Of Turbine Means Replacement Of Blades And/or Improvement Of Blade Design?

Answer»

Like the blades, the steam-TURBINE rotors are highly stressed components. They are subject to cracking by a VARIETY of FAILURE MECHANISMS. Rotor failures do occur. And when they occur the result is catastrophic with the complete destruction of the unit and the total loss of generating capacity.

Therefore, special attention should be given to rotor UPGRADING and repairing techniques.

BLADE FAILURES

  • Unknown 26%
  • Stress-Corrosion Cracking 22%
  • High-Cycle Fatigue 20%
  • Corrosion-Fatigue Cracking 7%
  • Temperature Creep Rupture 6%
  • Low-Cycle Fatigue 5%
  • Corrosion 4%
  • Other causes 10%

Besides, many damage mechanisms operate in combination of, poor steam/water chemistry, certain blade design factors that vary from one turbine manufacture to other, system operating parameters.

Like the blades, the steam-turbine rotors are highly stressed components. They are subject to cracking by a variety of failure mechanisms. Rotor failures do occur. And when they occur the result is catastrophic with the complete destruction of the unit and the total loss of generating capacity.

Therefore, special attention should be given to rotor upgrading and repairing techniques.

BLADE FAILURES

Besides, many damage mechanisms operate in combination of, poor steam/water chemistry, certain blade design factors that vary from one turbine manufacture to other, system operating parameters.



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