Alerts & Learnings

Beam trolley drop

Incident 1

A manual gear trolley was reported to be partially disengaged from the monorail. No activity was carried out around the location at the time of discovery. Potential drop of 2.3 meters for a 52 kg weight.

Incident 2

A trolley was installed on the beam above a pump for its maintenance. The end stop was tested by the lifting team from the ground (i.e. 6 meters below) running it towards the edge. The trolley did stop yet there was no visual observation of its contact with the end stop. The following days, in the course of the maintenance activity, the trolley fell down on a nearby platform (3 meters below the beam). None of the 4 personnel presents in the vicinity were injured. Potential drop of 3 meters for a 40 kg weight.

Why it happened?:

In both cases it appears that the manual geared trolley when reaching the end of the beam was not stopped by the beam stopper due to the fact that the mechanical stopper was not wide enough to make contact with the trolley itself.

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