Safety at the Design Stage

Mid-frequency of third-octave band (kHz) Sound pressure levels under which nearly all workers may be repeadly exposed without adverse effect. [One third-octave band level (dB re 20pPa)] 

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Plant must be properly designed, installed, eommissioned, operated and maintained. Depending upon the risk, working proeedures should be doeumented, e.g. as eodes of praetiee. Consideration of safety at the design stage was diseussed in Chapter 12. 

FIGURE 8.2. Safety at the design stage and at various levels. 

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