Offshore Technology Conference 2021

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The paper by Tobias Winter analyses the probability of failure on demand of different subsea Christmas tree valve actuation principles and their related control system architectures.

The analysis includes the probability of failure on demand to isolate the well and the availability of each equipment type until a first failure causes the need for repair. The following different actuator and system designs will be analysed:

  • Spring based hydraulic actuator
  • Spring based electric actuator
  • Electric power screw actuator
  • Electric planetary roller screw actuator.

In summary, the highest availabilty system will be revealed.

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