Safety critical system (X-mas tree)

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Safety critical system (X-mas tree)

I need to research on this
Define operating modes
   ● Establish performance requirements (response time, reliability, leakage.....)
   ● Define requirements for ”œautonomy interface” (i.e. control system and information transmitted
       - To subsea production system
       - To products/sub-system (e.g. Safety critical valve or chemical injection valve)

Can you please help on this .