It sounds like your owner's engineer or insurance company will have a good case against the OEM/EPC contractor.
I'd still try and press your EPC contractor to fit blade vibration monitoring to ensure the blades are operating in a safe zone (load+vacuum wise). This is quite different from having...
Suprised that the OEM allows +- 5% in frequency variation. On 50Hz machines I've seen limits of 2%. I used to work for an OEM and was involved in the repair and investigation of a 660MW machine that had L-0 blade failure. Vacuum was suspect on that unit as well but investigation found that poor...
