Description of Incident
The incident occurred during decommissioning activities on board a spar, where a fire water pump skid had to be removed. It was gouged out from the top of spar in accordance with the decommissioning plan, but during the initial lift, it remained partially attached.
The crew stopped work and exchanged the rigging for a more robust solution. During the second lift attempt, the skid unexpectedly came free and made contact with an adjacent nitrogen vessel, which had previously been cut 95% loose. The sudden and unplanned release of energy led to the nitrogen vessel tank striking the injured person, who was standing in the line of fire. He fell backwards and hit his head on a diagonal bracing, causing him to lose his helmet as he fell down. The injured person was transferred back to the vessel, where a medivac was waiting to transport him to a hospital onshore.
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