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Mobile Crane Drops Load

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  • COMPLIANCEgate

Information:

What

A mobile crane dropped its load, a 305 mm (12 inch) diameter steel pipe when the lifting chain slipped off the pipe. The crane was used to suspend the pipe vertically in the air while being struck by a hammer to remove wet sand clogged (de-sanding) inside the tailings pipe. The sand was released from the pipe suddenly causing the lifting chain around the pipe to come loose. Fortunately, both the crane operator and the striker managed to move out of harms way in time.

Why

The incident occurred because the sand clogged inside the pipe came out rapidly causing sudden release of about two thirds of the total load of 3 tonnes. The sudden release of energy stored in the crane rope and the lifting boom caused the empty pipe to become weightless, bounce upwards and loosen the chain around the pipe.

Recommendations

Recommendations include ensuring a team consisting of people with the appropriate technical and risk management skills complete a Job Safety Analysis or Risk Assessment before embarking on an activity that is outside the scope of normal lifting operations, and ceasing de-sanding tailings pipes in this manner.



Organisation:

Department of Natural Resources and Mines

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Jurisdiction:

Relates to Queensland (QLD)

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Information:

HTML
Coverage:

QLD - Queensland

Author:

Queensland Department of Natural Resources and Mines

Publisher:

Queensland Department of Natural Resources and Mines

Published:

19 Sep 2002



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