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HAV Essentials

HAV Essentials. Jim Maccall. Session Plan. Session aims and objectives What is HAVS PPE Other conditions Managing Exposure Risk Assessment Health surveillance. Learning Outcome. Understand why training is required Be able to describe the causes and symptoms of HAVS

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HAV Essentials

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  1. HAV Essentials Jim Maccall

  2. Session Plan Session aims and objectives What is HAVS PPE Other conditions Managing Exposure Risk Assessment Health surveillance

  3. Learning Outcome Understand why training is required Be able to describe the causes and symptoms of HAVS Know the consequences of not managing HAV Know practical ways to manage HAV

  4. Session 2 – What is HAVS? • In teams of two • What is vibration? • What is HAVS? • What kit do you use that is high risk?

  5. What is vibration? Vibrations arise when a body oscillates due to external and internal forces In the case of hand-arm vibration, the handle of a machine or the surface of a work piece vibrates rapidly, and this motion is transmitted into the hand and arm

  6. What is HAVS? HAVS – Hand Arm Vibration Syndrome includes more than one condition including: Vibration White Finger Carpal Tunnel Syndrome

  7. Vibration White Finger (VWF) • Symptoms - Sufferers from VWF may have a permanent loss of sensation in their fingers, causing difficulty in picking up and manipulating small objects • Blanching of finger tips are early symptoms • Long-term damage to circulation can lead to more serious conditions such as Gangrene

  8. Vibration White Finger (VWF)

  9. VWF – What is the cause? Tiny capillaries carry blood to the extremities Reducing blood flow to your toes, fingers and other parts helps maintain temperature as they can act as radiators for heat Complex and delicate systems alter blood flow constantly to maintain core temperature African elephants have very effective radiators – their ears!

  10. VWF – What is the cause?

  11. How painful is it? Fit an elastic band to a finger you don’t use too often!

  12. Numbness – how numb? A volunteer who has a phone with a keyboard to fit a rigger glove or similar. send you a text e.g. “the quick brown fox jumped over the lazy dogs”

  13. Session 3 - PPE Can PPE help? Can Anti Vibration gloves help? 6.3 to 200 Hz Gloves?? Fit one glove – what temperature is achieved in each hand?

  14. What size gloves?

  15. Session 4 - Other Conditions The medical condition is Raynaud’s Phenomenon – around 10% of women and 5% of men are affected – many untreated Bouts of pain can be triggered by minor temperature changes i.e. the air-con being switched on Exposure to harmful vibration must be avoided http://www.raynauds.org.uk/

  16. Carpal Tunnel Syndrome

  17. Pause for Thought Do you know someone who gets some symptoms? You must report HAVS to the HSE if your employee is diagnosed. Even if they weren’t “harmed” whilst working for you Do you get pain in finger tips on cold days? Are you putting yourself or others at risk of HAVS through your work?

  18. Session 5: Consequences of HAVS? Legal Moral Commercial

  19. Health & Safety at Work Etc. Act 1974 The Construction Design & Management Regulations 2007 Control of Vibration at Work Regulations 2005 Provision and Use of Work Equipment Regulations 1998 The Personal Protective Equipment Regulations 1992 Management of Health and Safety Regulations 1999 The Reporting of Injuries, Diseases & Dangerous Occurrences Regulations 2013

  20. Legal Control of Vibration Regulations set out specific duties, such as, you should: assess the vibration risk to your employees introduce a programme of controls to eliminate or reduce exposure to as low a level as is reasonably practicable provide health surveillance (regular health checks) to employees review and update your risk assessment regularly

  21. Moral Disabling workers We need more skilled workers, not less Knowingly allowing your workers to be exposed to harm 5,000,000 workers are regularly exposed to HAV and 2,000,000 of these are at high risk of developing HAVS

  22. Commercial Current estimates are that 255,000 workers are suffering from HAVS The average claim value / cost is £80,000 and climbing Insurance premiums will increase as a result Clients / Principal Contractors require contractors to have a HAV Management Policy / Programme: Policy = contract = £ Adopting good practices / HAV Management increases productivity

  23. Pause for Thought Does your organisation currently manage HAV effectively at the moment? Who are the most “at risk” workers in your organisation? Do you know someone with HAVS? How does it affect their life?

  24. Session 5: HAV Management You are required to Risk Assess workers exposure to vibration An essential element to any Risk Assessment is to Eliminate - ERIC PD If you cannot avoid exposure, it should be limited Limits (maximum doses) have been set for employers to manage

  25. Exposure Action Value • EAV • If employees are exposed to vibration above this value then action must be taken to reduce exposure • EAV is 2.5m/s2 A(8) or 100 Exposure Points • A(8) = average over 8 working hours • Actions are based on your Risk Assessment

  26. Exposure Limit Value • ELV • Employees must not be exposed to vibration above this value • ELV is 5m/s2 A(8) or 400 Exposure Points • A(8) = average over 8 working hours • Lots of equipment and operations are likely to expose workers to a vibration dose above and beyond the Limit Value

  27. Typical Vibration Values values in m/s2

  28. Vibration White Finger (VWF)

  29. He used a CP9 to prep over 1,000 pile caps on one job • Vibration magnitude of CP9 at the time – 32m/s2 • = 2048 point per hour • Or 34 points per minute • EAV (Exposure Action Value – 100 points) in 3 minutes • ELV (Exposure Limit Value – 400 points) in 12 minutes • George was regularly getting >8,000 points per day

  30. Christmas List!

  31. Sums Points =n(1 hour) = 2 x (ahv)2 where ahv= vibration value / magnitude quoted e.g. from supplier So if quoted vibration value of grinder is 6m/s2 Points = 2 x (ahv x ahv) = 72 points per hour used Time to reach EAV (100) = 100 / 72 = 1 hr 23 mins trigger time Time to reach ELV (400) = 400 / 72 = 5 hr 33 mins trigger time

  32. Typical Vibration Values Manufacturers Data - values in m/s2

  33. Ready Reckoner A number of “ready reckoners” are available. All give a quick route to convert magnitude to points

  34. Pause for Thought Working out exposure for one worker using one piece of equipment is fairly easy to do. How do you keep track of workers exposure if they use more than one power tool per day? How does “trigger time” compare to time “using the equipment”?

  35. Measuring Trigger Time You could use: A stop watch - operated by 2nd person A timer linked to the power source A timer activated by vibration that also monitors points e.g. The HAVi A vibration management system e.g. HAVMETER from Reactec

  36. So how does HAVi work on site? Retrofitted to any tool Vibration magnitude Colour coded Flashing Light HSE points Heavy Duty Operated remotely Trigger time

  37. Risk Assessment - Data Field data is always preferred as it is “real-life” however, this is not always easily available. Speak to your equipment supplier, they are obliged to supply you with data and advise of its source e.g. grinder model GR04 – vibration 2.5m/s2 to ISO8662 – manufacturer declared value From this you can start to calculate vibration doses

  38. Pause for Thought Getting “good” data is a challenge If you work for large contractors speak to their safety team about what data they use. They will share it with you as they want consistency on their sites Hire companies are a great source of vibration data too Is heavier kit better or worse? – two volunteers please

  39. Session 6 - Risk Assessment You now have looked at the task, gathered the machine data and the time used for each machine, you can work out the exposure for that “shift” The table overleaf is based on a steel fixer who needs to open up bolt-holes, grind flat contact faces and install hardware using an impact wrench

  40. Exposure Table • This is below the ELV but higher than the EAV – Exposure Action Value • What should /could you do? • Health surveillance – remember, if a worker already has symptoms their action / limit values will be lower • Buy / Hire Smooth – can you use equipment with a lower vibration value? • Team Work! – Could job rotation be used i.e. 3 workers – less than 60 points each

  41. Session 7: Health Surveillance

  42. Conclusion • Hand Arm Vibration is easier to manage than ever • To Do List • Look at the tasks and operations you do • Get a list of the kit you use • Get vibration data for your kit • Measure “trigger time” for the operations • Do the sums and take action as required • Keep a record of this Risk Assessment • Join our LinkedIn group – HAVS Forum

  43. Further Reading HSE Guide for Employers – http://www.hse.gov.uk/pubns/indg175.pdf Leaflet for employees / noticeboards – http://www.hse.gov.uk/pubns/indg296.pdf General HAV Info from the HSE– http://www.hse.gov.uk/vibration/hav/index.htm

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