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Failure of master link during subsea lifting operations - DEV imca
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Failure of master link during subsea lifting operations

An incident has been brought to IMCA’s attention in which a master link (lifting ring) fitted to a 10t air lift bag failed in use during subsea lifting. This style of master links are also fitted to 10t water load bags.

Overall size of the master link
Overall size of the master link
Part number embossed on the flat section
Part number embossed on the flat section
Part number embossed on the flat section
Part number embossed on the flat section

Unique Seaflex has identified the batch number of the parted master link. However, as these links are interchangeable, as a precaution, the company has decided to advise all owners or users of 10t air lift bags and 10t water load bags to inspect the master links fitted to their bags and quarantine any products marked with the following two possible lot numbers (which can be found embossed within the pressed section opposite the weld in the centre of one long side):

  • IWA
  • LWA

Members using 10t air lift bags or 10t water load bags fitted with a red master link marked IWA or LWA should contact Ian Margham at ian.margham@uniquegroup.com for further information in regards to ring change-out and replacement instructions.

Members may wish to consult the following similar safety flashes:


IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of all. The effectiveness of the IMCA Safety Flash system depends on Members sharing information and so avoiding repeat incidents. Please consider adding safetyreports@imca-int.com to your internal distribution list for safety alerts or manually submitting information on incidents you consider may be relevant. All information is anonymised or sanitised, as appropriate.

IMCA’s store terms and conditions (https://www.imca-int.com/legal-notices/terms/) apply to all downloads from IMCA’s website, including this document.

IMCA makes every effort to ensure the accuracy and reliability of the data contained in the documents it publishes, but IMCA shall not be liable for any guidance and/or recommendation and/or statement herein contained. The information contained in this document does not fulfil or replace any individual’s or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.