Skip to content

Dropped load and failed chain

What happened?

A chain link failed causing a load of over 260kg to fall 1.5m to deck. The incident occurred during transfer of a bundle of scrap cable, when a chain link snapped causing the load to fall the last 1.5m to deck. The load weight was estimated to be between 260 and 390 kg. The failed chain link was approximately 10.5m from the hook.

As per correct lifting practices, no people were near the load during the lift. There were no injuries and no damage.

Original link
Link after break load testing
Failed link from incident

What went wrong?

Our member’s investigation noted the following:

  • The most recent inspection of the chain hoist was 3 months prior this incident;
  • At the time of the occurrence, the chain link that failed was in the vertical plane and mid-air – the failure was unexpected and not caused by any torque, friction, tension or bending;
  • The chain was at approximately 12% of its theoretical lifetime. Post incident break load testing showed an actual break load of the chain of 3400 kg. Metallurgic and fracture investigation were conducted on the actual chain;
  • The failed link showed to have had an external impact on the weld side, which caused weakening of the structure by approximately 90%. This caused a failure mechanism different from normal overload breaking.

What lessons were learned?

  • Regular visual inspections of your lifting gear;
  • Be aware that any external impacts on lifting gear may have a negative impact on its strength;
  • Any damage spotted on lifting equipment should be reported and when necessary, such equipment quarantined and re-inspected.

Members may wish to refer to:

Safety Event

Published: 17 March 2020
Download: IMCA SF 10/20

Relevant life-saving rules:
IMCA Safety Flashes
Submit a Report

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 [email protected] 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 ( 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.