The dangers of stored energy have been highlighted after a mine worker was seriously injured during the decommissioning of metal pipework.
According to Resources Safety & Health Queensland (RSHQ), the worker was struck by the uncontrolled movement of a section of steel pipe after stored mechanical energy was unexpectedly released.
The incident occurred while workers were using oxy-acetylene equipment to cut a long section of redundant DN300 process pipe into transportable lengths. Preliminary findings indicate the pipework had previously been pulled into position using heavy earthmoving equipment before the cutting work began.
As the cut neared completion, the remaining wall of the pipe appears to have torn, releasing the stored mechanical energy within the pipework. The resulting uncontrolled movement struck the worker with significant force, causing serious injuries.
While investigations are ongoing, the regulator said the incident highlights the hazards associated with stored energy during the installation, modification, repair and removal of metal pipework.
It warned that metal pipework can retain multiple sources of stored energy, both while in operation and after being taken out of service. The use of heavy mobile equipment, winches, and other machinery to install or reposition pipework can also introduce mechanical stresses that may be released later if not identified and controlled.
The regulator has urged mine operators to ensure risk assessments, procedures and safe work instructions specifically address how stored energy will be identified, controlled and safely released before maintenance, demolition or decommissioning work begins.
It also recommended implementing controls that isolate potential sources of stored energy and remove workers from the line of fire wherever possible when carrying out pipework decommissioning or demolition activities.
Investigations into the incident are continuing, with the regulator indicating further information may be released as it becomes available.
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