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Vibration - Occupational - Hand Arm Vibration Syndrome [HAVS]
The Control of Vibration at Work Regulations have come into force (see below). Workers whose hands and arms are regularly exposed to high vibration levels may experience injury to the hands and arm; these injuries include damage to the blood circulation system and to the nerves and muscles; one of the symptoms can be finger blanching and numbness which gives the condition its other name of Vibration White Finger or VWF; however,Replica Watches the correct term is "Hand Arm Vibration Syndrome". Find out more at the HSE website.
Hand Arm Vibration Syndrome is typically caused by using tools, such as jack-hammers and chain-saws; however, vibration exposure can occur when guiding work-pieces through machinery, e.g. pedestal grinders.
Assessment of Damage
It can be seen that the relationship between daily exposure, years at any given exposure and vibration magnitude are complex. The equivalent exposures are produced in Table 5 of BS.6842:1987. This table reproduced below gives the equivalent exposures at which would produce finger blanching symptoms in 10% of an exposed population:
In an investigation of a employee?s vibration history, the first factor looked for, is use of a tool which would produce a frequency weighted acceleration in excess of 1.0 m/s?; then, if the vibration dosage would have caused finger blanching [or worse] in more than 10% of an exposed population.
The Control of Vibration at Work Regulations 2005
Further and more comprehensive details of the Control of Vibration at Work Regulations 2005 can be read in the HSE publications INDG175 and L140. The following is a brief extract of INDG1755.
The Exposure Action Value
The exposure action value (EAV) is a daily amount of vibration exposure above which employers are required to take action to control exposure. The greater the exposure level, the greater the risk and the more control employers will need to install. For hand-arm vibration the EAV is a daily exposure of 2.5 m/s2 A(8).
The Exposure Limit Value
The exposure limit value (ELV) is the maximum amount of vibration an employee may be exposed to on any single day. For hand-arm vibration the ELV is a daily exposure of 5 m/s2 A(8). It represents a high risk above which employees should not be exposed.
The Regulations allow a transitional period for the limit value until July 2010. This only applies to work equipment already in use before July 2007. The exposure limit value may be exceeded during the transitional period as long as the employer has complied with all the other requirements of the Regulations and taken all reasonably practicable actions to reduce exposure as far as possible.
The Control of Vibration at Work Regulations require employers to
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