High integrity/fail-safe control. All safety control systems should be designed and built to prevent failure or, in the event of failure, de-activate the operation of the machinery and equipment. The extent to which a safety control system should tolerate faults is a function of risk (likelihood and consequence), and is described fully in AS4024.1501 Safety Related Parts of Control Systems, which explains the categories of control required as a function of increasing risk.
For potentially harmful substance exposures from machinery and equipment, such as mist, fumes, vapour or dust, and where it is not possible to control the emission at its source, ventilation and extraction systems are used to remove the hazardous emissions from the work environment.
Access may vary during each stage of the machinery and equipment life cycle. For example: • installation or removal o complete access from every area may be required and involve disconnection or connection of services, such as water, air, pipes, installation of electrical cable to switch board • operation o access for set up, operation and adjustment • maintenance, repair, cleaning, alteration or adaptation o access to remote areas may be required.
People providing cleaning services could: • work alone • access machinery and equipment from the rear or sides, or in unexpected ways • climb on machinery and equipment • enter confined spaces, or larger machinery and equipment • become trapped by the mechanism of the machinery and equipment through poor isolation of energy sources or stored energy, such as spring-loaded or counter-balance mechanisms, compressed air or fluids, or parts held in position by hydraulics or pneumatic (air) rams • work with chemicals • operate electrical equipment in wet areas.
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