Incorrect isolation of conveyor | Resources Safety & Health Queensland
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Mines safety alert no. 163 | 25 May 2007 | Version 1

Incorrect isolation of conveyor

Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.

We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.

Mine type

All mine types

Incident

At the end of a job on a conveyor it was discovered that the local control isolator had been locked in the 'ON' position during the entire job. The persons had incorrectly understood that the isolator handle was in the 'OFF' position and were also able to place a scissor type multiple lock out device through the operating handle locking mechanism. During the course of the isolation other persons had placed locks in the scissor lockout device as part of an isolation procedure. No test for correct isolation of the conveyor was made. No injuries or equipment damage occurred.

Equipment

Local control isolator, conveyor belt.

Hazard

Entrapment of persons in or on a moving conveyor.

Cause

Lack of clear indication for operating handle in the ON/OFF position and failure to carry out test of isolation. Also a lack of understanding the isolation procedure existed.

Comments and recommendations

The local control isolator had been fitted to the conveyor and was in use for several years.

Although this is a particular brand of isolator the same incident could occur on other isolators.

Isolators may have provision for locking in the ON position.

In this case the ON/OFF positions are clearly marked but the correct position of the operator is not clear.

  • Check isolators to determine whether locking in the ON position is possible.
  • Ensure isolators and operating handles are clearly marked with ON/OFF positions.
  • Ensure persons are adequately trained in the operation of the local control isolators and understand the isolation test process.
  • Clearly identify those isolators that have provision for locking in the ON position.
  • Provide a visual means of confirming that the 3 phases of the isolator are open.
  • Ensure there is an adequate test for off provision in the isolation procedure.
  • Review isolation procedures.

Authorised by Michael Downs - Regional Inspector of Mines, Central

Contact:

Issued by Queensland Department of Mines and Energy

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RSHQ respectfully acknowledges all Aboriginal peoples and Torres Strait Islander peoples as the Traditional Owners and Custodians of the country on which we live and work. We acknowledge their continuing connection to land, waters and culture and commit to ongoing reconciliation. We pay our respect to their Elders past and present.