Near miss: Single wire strand protruded from original lay

What happened

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.

Members may wish to review the following incident:

• Near-miss: Fault spotted in subsea lifting wire