Camets was conducting an environmental noise survey of a metal extrusion plant when problems were identified with hearing conservation noise levels. As part of the noise survey hearing conservation noise levels were also assessed simultaneously. The simultaneous collection of both environmental and hearing conservation noise levels is economical in cost and labour.

The noise levels within the plant were found to exceed acceptable WorkCover noise levels. A number of management solutions were considered to rectify the various problems and included: time management, machinery noise reduction and the continuing use of hearing protectors. The time management procedures proved unpractical. Some items of equipment identified as environmental noise problems for neighbours were quietened at their sources and achieved the dual goals for environment and hearing conservation . For the remaining areas continuing usage of hearing protectors was recommended, the current hearing protector devices used in the plant were assessed.

Management requested Camets to assess which hearing protectors could be used throughout the plant and provide adequate protection for a double shift (refer to hearing conservation material in Acoustic Information Section). The assessment was undertaken by spectral matching the factory noises to those of the hearing protection devices. It was found that out of the seven different types of devices used two did not provide adequate protection and two devices provided only marginal protection in all areas of the plant. Some time later the client required the assessment of a new type of hearing protector which was also assessed against existing data, without additional measurements.

Put us to the test and ask for some free advice. For further information about Camets Acoustics please contact us.