Safe_Design_Manufacture_Import_and_Supply_of_Plant.doc

Safe work australia members meeting 6 30 september

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SAFE WORK AUSTRALIA MEMBERS’ MEETING 6 30 SEPTEMBER 2010 PAGE 28 OF 52
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Control devices should be designed: to enable the plant to fail to a safe condition to be within easy access of the operator to enable extra emergency stops to be located so they can be operated from other parts of the plant. A risk assessment would assist in their location so they are clearly visible, identifiable and appropriately marked where necessary, for example, signed to indicate on/off so the intended function of the control is clearly indicated and the action used to operate the control is aligned with the effect on the plant – for example, moving a control to the right should move the plant to the right using symbols as opposed to written instructions, wherever possible, so they can be easily read and understood, especially in the case of dials and gauges so the movement of the control is consistent with established convention, for example, anticlockwise to open, clockwise to close so the desired effect can only occur by intentional operation of a control, for example, provision of a starting control to withstand the rigours of normal use, undue forces and environmental conditions so they are located outside danger zones so they are located or guarded to prevent unintentional activation so they can be locked in the ‘off’ position to enable disconnection of power so they are readily accessible for maintenance. It should only be possible to start plant by deliberately actioning a control provided for that purpose. The same requirement applies when restarting the plant after any stoppage. Each item of plant should be designed to accommodate a control so the plant or its relevant components can be brought to a complete stop safely. Further information on controls and symbols is available in AS 4024: Safeguarding of machinery – general principles . 4.10 Emergency stops Emergency stop devices should not be the only method of controlling risks. They should be designed as a backup to other control measures. SAFE WORK AUSTRALIA MEMBERS’ MEETING 6 30 SEPTEMBER 2010 PAGE 29 OF 52 A designer of plant must ensure that if the plant is to be operated or attended by more than one person and more than one emergency stop control is fitted, the design must provide for multiple emergency stop controls to be of the “stop and lock-off” type, so that the plant cannot be restarted after an emergency stop control has been used unless that emergency stop control is reset. If the design of the plant includes emergency stop controls, the designer must ensure that the design provides: for the stop control to be prominent, clearly and durably marked and immediately accessible to each operator of the plant , for example ‘EMERGENCY STOP – PRESS’ for any handle, bar or push button associated with the stop control to be coloured red, and that the stop control cannot be adversely affected by electrical or electronic circuit malfunction.
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The emergency stop system should be compatible with the operational characteristics of plant.
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  • Fall '14
  • ........., Occupational safety and health

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