WHAT IS HAVS?
Hand Arm Vibration Syndrome, known as HAVS or white finger is generated through the use of hand held power tools. There are over 300,000 people suffering from HAVS in the UK alone, and therefore there is now an increased level of concern currently being generated by the HSE. HAVS is a serious and debilitating condition that effects the blood vessels in the hand and arm, eventually resulting in irreversible damage if uncontrolled or monitored ineffectively.
The policies set by the HSE in the Control of Vibration at Work Regulation (2005), state the requirements of the employer is to provide suitable health surveillance in order to monitor and control the risk of vibration to employees.
Hand Arm Vibration & Whole Body Vibration
Control of vibration at work regulations (2005)
The control of vibration at work regulation (2005) was created under the health and safety at work Act 1974, it is the UK legislation that govern vibration exposure in the work place. The regulation obligates the employer to reduce the risk to their employees health from exposure to vibration.
In order to actively reduce risk the following must be taken into consideration:
- Is there a way to complete the task without using vibrating equipment?
- Are the operatives using the optimum equipment to complete the task?
- Is the equipment being used maintained and fit for purpose?
- Is the operative currently in a fit state of health in order to operate the equipment?
- Has a risk assessment been completed?
- Is the operator training proficiently in the use of the equipment?
Vibration Calculation And Exposure
HSE regulations state: “suitable health surveillance should be undertaken where risk assessment indicates a risk to workers health.”
Good practice within industrial health and safety management indicates that in order to survey the risk to workers effectively, acceleration magnitude and duration should be assessed in relation to vibration exposure. Commonly health surveillance simply detects and highlights those operatives who have contracted HAVS. However continuous monitoring can quantify risk, allowing for timely data analysis, which can predict and prevent contraction of HAVS.
Fact: There is no cure for HAVS
In order to reduce the risk to your employees prevention is better than detection.
The HSE regulations provide all tools with an EAV and ELV for hand arm vibration (HAV) and whole body vibration (WBV). Employers are then expected to make an assessment of exposure that identifies the risk of either value being exceeded.
Exposure action value– the time a tool can be used on a daily basis before action must be taken to reduce exposure (EAV) 2.5m/s2 A(8) is equal to 100 points.
Exposure Limit Value– the maximum amount of vibration an employee can be exposed to in a day (ELV) 5m/s2 A(8) is equal to 400 points.
The table shows the EAV and ELV exposure limits for both hand arm vibration and whole body vibration.
Using a vibrating tool with a low magnitude for an extended period of time can be as damaging as using a tool with a high magnitude for a short period of time. The table below can be used to manually calculate daily vibration exposure level in points.
The vibration magnitude level of a tool is provided my the manufacturer or can
be gained from live/field testing of the tool. Magnitude can vary from tool
design, condition and the style of use.
Magnitude is quoted in =
metres per second square
In order to gain accurate results for vibration surveillance and monitoring, duration must be measured as TRIGGER TIME.
(The period of time when the operator actually has their finger on the trigger, making the tool active.)
Duration is quoted in = Hours Per Day
Curotec has a team of experienced health and safety consultants on hand to explain the further implications and risks associated with Hand Arm and Whole Body Vibration, in order for you to protect your employees and protect your business.