During deployment of the bell and clump weight from a vessel for subsea inspection of a riser line, it was observed that a single wire strand protruded from original lay (‘high stranding’). The bell was recovered, the clump weight wire visually inspected and it was determined that a 60m cut back of damaged rope take place. The damaged section was removed and the rope re-terminated.
Third party mandatory load test and certification of the item was carried out and certified as fit for purpose and diving operations resumed.
What lessons were learnt?
- The clump weight should not remain subsea during periods of increased tidal current above the limit recommended for diving operations;
- There should be thorough visual inspection of all the ropes and sockets during recovery and deployment of clump weight;
- Ensure frequent monitoring for the ropes and sockets, and any findings recorded;
- Any small defects, damage or abnormality on ropes should be brought to the attention of the Competent Person;
- Precautions should be in place to avoid stress on ropes caused by adverse weather conditions.
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