In some circumstances it is possible to greatly reduce the vibration exposure by using a larger breaker attachment mounted on the arm of an excavator. The amount of work that an operator can do with one of these tools in a day varies depending on the depth and hardness of the surface to be broken up.
A full-time breaker operator working on a road excavation job might be exposed to this vibration for an average of 3 hours per day which would give a typical exposure of 7 m/s 2 A(8) which is above the exposure limit value. These tools typically produce hand-arm vibration magnitudes of between 5 and 20 m/s 2 with an average of around 12 m/s 2. The most common tool used to break up road and pavement surfaces is the hand-held percussive breaker. Monitoring exposure to Hand-Arm Vibration.Noise reduction in the ship repair industry – research report 1992.Codes of Practice from the Water Jetting Association.
Installation of hydraulic cropping machine.Eliminate fettling by improving casting quality.
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