Skip to content

Pro-active intervention prevented high potential dropped objects

What happened?

During inspection of the vessel crane, it was noted that a steel spacer plate had become partially detached due to corrosion forming behind the plate. The plate had been installed by the manufacturer during the crane installation but had not been removed as intended. On touching the spacer, it detached completely but was prevented from falling.

What went wrong? What were the causes?

The spacer plate had been present since original vessel/crane build. It weighed 1.5kg and had the potential to fall 40 meters to deck. The only means of attachment for the steel plate to the structure was by tack welding. This was an accepted form of attachment by the manufacturer for temporary use, but not for permanent equipment.

What lessons were learned?

  • Be vigilant during dropped object reviews for items with similar method of attachment i.e. tack welded;
  • Ensure that any identified items are securely attached;
  • Report any incidents of non-continuous welding and obtain guidance on corrective actions;
  • If required, adjust maintenance actions to monitor for corrosion.

Members may wish to refer to the following incident:

Safety Event

Published: 10 September 2018
Download: IMCA SF 20/18

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.