6.3 Hand-Arm & Whole-Body Vibration

6.3 Hand-Arm & Whole-Body Vibration

Quick Answer: Under the Control of Vibration at Work Regulations 2005, hand-arm vibration (HAV) has an exposure action value of 2.5 m/s² A(8) and an exposure limit value of 5.0 m/s² A(8). Manage by reducing tool vibration and trigger time, maintaining equipment, rotating jobs, informing workers, and using health surveillance. Whole-body vibration (WBV) mainly affects vehicle operators — control through machine choice, seats, surfaces, speed, and time on the machine.

Vibration is another physical health hazard that Managing Safely expects managers to recognise. Unlike a cut finger, vibration injury often builds slowly. By the time a worker reports white fingers in the cold or lasting numbness, damage may already be serious. The exam loves the HAV numbers 2.5 and 5.0; the workplace loves managers who cut trigger time before people are harmed.

Legal framework overview

The Control of Vibration at Work Regulations 2005 require employers to:

• Assess vibration risk from work equipment and vehicles
• Eliminate vibration risk or reduce it to as low as reasonably practicable
• Ensure the exposure limit value is not exceeded
• Provide information, instruction, and training
• Provide suitable health surveillance where the risk assessment indicates a risk to health (including where the action value is likely to be exceeded)

Employees must use control measures, report defects, and cooperate with health surveillance arrangements.

Hand-arm vibration (HAV)

Hand-arm vibration is vibration transmitted into the hands and arms from tools, equipment, or workpieces. Common sources:

• Grinders, sanders, polishers
• Breakers, road drills, scabblers
• Chainsaws, brush cutters, hedge trimmers
• Impact wrenches, needle guns, riveting tools
• Pedestal grinders and some workshop tools when the workpiece transmits vibration

Exposure is usually expressed as A(8) — an 8-hour energy-equivalent vibration magnitude in m/s². Manufacturers publish vibration emission values; real-use values can be higher with worn tools, poor technique, or hard materials. Managers should treat catalogue numbers as a starting point and use HSE exposure calculators or competent advice for realistic trigger-time limits.

HAV action and limit values (memorise)

Exam pattern: 2.5 action / 5.0 limit for HAV. Do not confuse with noise’s 80/85/87.

Health effects — HAVS and related harm

Hand-arm vibration syndrome (HAVS) is a group of disorders affecting blood vessels, nerves, and joints of the hand and arm. Teaching points for managers:

• Vascular effects — vibration white finger: fingers blanch (go white), often triggered by cold, with pain and redness on recovery; reduced blood flow can become permanent
• Neurological effects — numbness, tingling, reduced sense of touch and temperature; loss of fine dexterity (difficulty buttoning clothes, handling small parts)
• Musculoskeletal effects — pain, reduced grip strength, joint problems in wrists and arms; links with carpal and related issues in heavy tool users
• Quality of life and work ability — workers may struggle with outdoor work in cold, precision tasks, or holding tools safely

HAVS is preventable. It is also potentially career-ending. Early reporting of symptoms must be welcomed, not punished.

Who is at higher risk?

• People with long daily trigger times on high-vibration tools
• Users of poorly maintained or unsuitable equipment
• Workers in cold conditions (vascular symptoms worsen)
• Smokers (circulation) — health advice often includes smoking cessation support
• Workers who grip tools harder than necessary (increases transmission)

Controlling HAV — manager toolkit

Use hierarchy thinking again. Do not jump to gloves as the solution; anti-vibration gloves have limited effect and must not be an excuse to ignore tool choice and time limits.

Trigger time and points systems (manager awareness)

Many organisations use exposure points so supervisors can total a worker’s daily vibration without complex maths on every job. The principle for you: high-vibration tools use up the day’s allowance quickly. A short period on a breaker can equal a long period on a low-vibration sander. Plan multi-tool days so nobody silently exceeds the limit.

Whole-body vibration (WBV) overview

Whole-body vibration is vibration transmitted through the seat or feet to the whole body, mainly from:

• Forklift trucks, telehandlers, dumpers, excavators
• Tractors and agricultural mobile plant
• Quarry and construction plant on rough ground
• Some industrial vehicles and poorly suspended cabs

Health concerns include back pain and spinal disc problems, especially when combined with poor posture, manual handling, and long driving hours. Managing Safely expects awareness rather than deep numerical memorisation for WBV compared with HAV’s 2.5 / 5.0 — focus on sensible controls:

• Select vehicles with good suspension and adjustable seats; maintain suspension seats (a collapsed seat is a control failure)
• Maintain site roads, yard surfaces, and tyres; reduce unnecessary speed and harsh driving
• Plan routes and loading to avoid the roughest ground where possible
• Limit continuous time on vibrating plant; mix tasks
• Train operators on posture, seat adjustment, and reporting seat defects
• Consider WBV in risk assessments for mobile plant roles; seek competent advice where exposure may be high

Do not invent precise WBV legal numbers in the exam if you have not been taught them; use qualitative control knowledge and, where needed, specialist assessment.

Linking vibration to risk assessment and the project

Example project chain:

1. Hazard: hand-arm vibration from angle grinders preparing welds.
2. Hazardous event / exposure: daily A(8) approaching or exceeding action value leading to HAVS.
3. Who: fabricators, apprentices, occasional maintenance staff.
4. Existing controls: some job rotation; basic PPE culture; limited tool maintenance.
5. Additional controls: replace worn grinders; introduce low-vibration models; formal trigger-time limits; training; health surveillance; ban of damaged discs and improvised tools.
6. Residual risk: lower likelihood of harmful A(8); consequence of HAVS remains serious if controls lapse — maintain supervision.

Noise and vibration together

Many tools produce both noise and vibration (grinders, breakers, chainsaws). Control programmes should be coordinated:

• Quieter, modern tools often vibrate less
• Enclosures and process change can cut both exposures
• Do not solve noise with PPE while leaving unlimited trigger time on a vibrating tool

Common exam traps

• Swapping 2.5 and 5.0 or mixing them with noise decibels
• Thinking HAVS is only “white finger” and ignoring neurological damage
• Believing thick gloves fully cancel vibration exposure
• Ignoring maintenance and consumable condition as control measures
• Assuming only full-time tool specialists are at risk — intermittent high exposure also matters

Manager checklist

1. List vibrating tools and vehicles in your area; estimate who uses them and for how long.
2. Memorise HAV EAV 2.5 m/s² A(8) and ELV 5.0 m/s² A(8).
3. Prefer eliminate, low-vibration purchase, maintenance, and time limits over PPE myths.
4. Keep hands warm; train on grip and reporting of tingling, numbness, or blanching.
5. Arrange health surveillance where risk assessment requires it; act on findings.
6. For WBV, fix seats, surfaces, speed, and duration — treat back pain reports as risk information.
7. Never allow continued work that would exceed the exposure limit value.

Control vibration like any other serious health hazard: measure exposure intelligently, reduce energy at source, limit time, and watch people’s health before irreversible damage sets in.