During offshore installation activities there was an unexpected release of the load resulting in it falling to the seabed. The incident occurred during the relocation of a spool from the riser base to the Pipeline End Manifold (PLEM). The operation was conducted from a members’ installation vessel crane, with a third-party provided 52Te lifting yoke previously used in the installation of the spool in 2011 and recertified for use.
What went wrong
Our members’ findings indicated the following:
- “Stop knobs” were not retracted resulting in significant unplanned forces being applied to the yoke structure causing yoke integrity failure and subsequent failure to secure the load (spool);
- Third-party written procedures for installation and commissioning of the third-party subsea equipment were not followed and were not completed;
- Company personnel had limited expertise with the use of the tooling used and relied on heavily on the third-party contractor to confirm that all steps in the commissioning procedure were completed;
- There was a misunderstanding in verbal communications in that company personnel thought that the “stop knobs” had been retracted, but they had not been retracted;
- By design the main Yoke pins were the weak points in the lifting configuration.
- Ensure that tooling design arranges for clear visual indicators on the tooling; and that the fail-safe design of their tooling has been considered;
- Reiterate to third-party contractors the importance of following tasks as per procedure;
- Check and carefully verify the competency, experience, and training of third-party contractor personnel;
- Check to ensure that there is no overlap or duplication between third-party contractor procedures and company procedures;
- In task planning, consider further detail, checking and verification for areas that may be unfamiliar;
- Ensure that risk assessments cover the interfaces or gaps between third-party contractor equipment and procedures, and company equipment and procedures.
Members may wish to refer to:
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