Isolation
Isolation is a way to separate the workers from silica dust . It is an effective control measure that can also be used in combination with engineering controls ( see below ) to reduce the number of workers potentially exposed to silica dust . For example , installing barriers between workers and machines that produce silica dust , both for workers generating the dust and workers nearby , such as those in adjacent offices .
Isolation can be achieved through : − isolating high dust generation work processes within an enclosed room with restricted access or an isolation booth ( Figure 4 )
− providing physical barriers and exclusion zones between different workers and workstations to prevent dust or water mist from moving into other work areas or towards other workers
− distancing a work process from other workers o for example , consider where other workers are working when powered hand tools are used , and − designating a room or area for other tasks such as changing or eating , away from the work area .
Figure 4 : An example of an isolation booth used for automated wet cutting .
Engineering controls
Engineering controls use physical methods to change the characteristics of a task , including mechanical devices or processes that eliminate or minimise the generation of dust and minimise it becoming airborne . For example , a combination of engineering controls like LEV , on-tool extraction or water suppression may be required to minimise exposure from each dust generating process .
When considering and using engineering controls , be aware of other hazards that may be introduced . As many engineering controls are motorised , a PCBU should be aware of noise and vibration levels at their workplace and issue personal hearing protection as needed .
Water suppression
Water suppression uses water at the point of dust generation to dampen down or suppress dust before it is released into the air . Powered hand tools and equipment fitted with water feeds are available , including grinders and polishers , and large machinery including bridge saws , routers or polishing machines .
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