A member has reported a near miss incident in which a chain link snapped under load. The incident occurred during a six monthly on-board lifting and rigging inspection. A deck foreman was required to arrange the lifting of an empty personnel basket from one place to another on the vessel. The basket was connected to the crane block, the deck foreman gave the command to lift, and as soon as the crane took up the full load of the basket, one of the chain links from the main chain sling of the basket snapped. There were no injuries.
Our member’s investigation revealed the following:
- The configuration of the rigging (the ‘bungee’ was shorter than the chain) created a space or belly during storage, with water trapped inside the plastic cover around the chain. Accelerated corrosion occurred, which may have contributed to chain failure. Corrosion, shock load and/or chain manufacturing process are potential causes for rigging failure;
- The sub-contractor doing the rigging inspection was not accredited by the manufacturer of the personnel basket to conduct inspections of such baskets. The internal procedure they used was a for steel-made work basket, and hence not applicable to a personnel basket;
- The last load test on this particular rigging and basket had been performed eighteen months before, whereas the load test should have taken place every sixth month as per manufacturer recommendation;
- The inspection company did not remove the plastic protection cover to inspect the chain, which meant that the visual inspection was not complete.
Our member took the following actions:
- Removed protection cover from rigging and performed thorough visual inspection;
- Checked that the storage configuration of the rigging does not allow water entrapment and associated corrosion;
- Investigated the possibility of replacing the plastic protection cover by an easy-to-remove cover type, for easier inspection;
- Checked personnel basket user manual and reviewed if rigging inspection sub-contractor was meeting manufacturer recommendations during last recertification campaign.
Members may wish to refer to the following similar incidents (key words: corrosion, failure):
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