Indirect Hydraulic System

This reduces the size of the control umbilical by splitting the hydraulic control functions into two -

  • Transmitting hydraulic power to the BOP down a large diameter line.
  • Transmitting hydraulic signals down smaller lines to pilot valves which in turn direct the operating power fluid to the appropriate BOP function.

The pilot valves are located in control pods on the BOP stack. In order to provide a complete back-up of the subsea equipment there are two control pods - usually referred to as the blue and the yellow pods.

No attempt is made to recover the hydraulic power fluid once it has been used to operate a function since this would increase the number of lines required in the umbilical. Instead the fluid is vented subsea from the control pod.


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