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Shutdown (regular or emergency) of the riser and DP shuttle tanker?

asked Sep 27, 2015 in Offshore-Upstream by lampanda (2,450 points)
How would one manage to do a regular shutdown or emergency shutdown of the riser from the dynamic positioning (DP) shuttle tanker in a controlled manner, without any spillage?

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answered Sep 28, 2015 by judyp (2,700 points)

How would you manage to do a regular shutdown or emergency shutdown of the riser from the shuttle tanker in a controlled manner, without any spillage?

Regular Shutdown

Regular shutdown should take effect by completely shutting down the oil pumps on the platform and closing the coupling head at the tanker end of the riser.

Emergency Shutdown

  • Emergency shutdown should be fully synchronized from the alarm sounding to the complete disconnect of the riser.
  • The sounding of the alarm and the closing of the valve should be automatically synchronized.
  • The quick disconnect should take place at the specified offset limit, without damage to the riser system.
  • The emergency disconnect operation should be executed within a four-second interval.
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