The System Shutdown logic activated and the compressor automatically shut down on high vibration. When the operator investigated the unplanned shutdown, two broken compressor head fasteners were noted lying on the deck.
- Motive Power Systems
- Safety Systems
- emergency shut down procedures and disconnects
The combination of the cold water temperature (reducing the fatigue strength of the bolt), and the abnormally high number of cyclical stresses imposed by the imbalance from the hydraulic system check valve failure resulted in the failure of the fasteners.