Industrial Noise & Vibration Centre

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Hand-Arm Vibration - HAV - Assessment

HAV Assessment and Risk Management – it's probably much simpler than you think…

Our rare level of expertise in hand-arm vibration (or vibration white finger – VWF) has allowed us to develop a uniquely pragmatic and effective approach to HAV risk management that dramatically reduces the resources required to meet regulatory and moral responsibilities. Our HAVS workshops also show you how.

Key innovations include HAVBase, the largest accurate field data hand-arm vibration database available that cuts assessment costs by up to 90% and is used in-house as a HAVS risk management system. Our HAV-Test is the only effective vibrating tool condition maintenance test system available. We also have the engineering skills to reduce vibration at source surprisingly often.

HAV measurements: often unnecessary - use our virtual assessment by email

HAV regulations: control vibration risk, don’t measure…

Beware: manufacturers’ vibration data for risk assessment...

Beware: Advertising Standards Authority rules wrist or glove mounted vibration monitors unsuitable... Read more >.

"I'm looking for a narrative in how an organisation managed a problem. A risk assessment or audit shows me a hazard was identified, but it doesn't always tell me what was done about it. There has been a lot of discussion over the past few years about how to measure vibration. But if employers focus their efforts on more and more measurement without putting risk reduction measures in place, all they are doing is providing evidence against their organisation should a claim ever arise". He refers to this data as "guilty knowledge" and suggests "rather than fretting about precisely how high a risk is, just work to reduce it". Chris Nelson, ex HSE specialist, BSI committee, leading HAVS expert witness.
If you are paying suppliers or consultants to measure the vibration on your tools every year or two, it’s very good business for them, but completely unnecessary…

The depressing evidence is that many HAV assessments are seriously flawed and that industry is storing up future problems despite the best of intentions. There is a minefield of opportunities for vibration risk management mistakes based on mis-information and myth. The most common areas for errors are:-

HAV mis-measurement – monitors measuring vibration to no standards whatsoever…

Misunderstanding HAV measurement and monitoring marketing material can put hands and safety policies at risk. Caveat emptor. Some claims made by some suppliers of the latest “HAV monitors”, “HAV dosimeters”, “vibration monitoring gloves” etc are disingenuous, misleading end-users as to the limitations inherent in these vibration monitors. None of these alternative HAV measurement techniques provide values that can be used for a reliable assessment of the vibration exposure of operators as required by BS EN ISO 5349-1 2001. Read the full details of why hand-arm vibration dosimeters, hand, glove or wrist-mounted transducer vibration measurement systems do not provide vibration values to the standard.

Manufacturers’ Hand-Arm Vibration Data – it’s data, but not necessarily assessment data

HAV traffic light

Manufacturers’ updated declared values (to BS EN ISO 8662; EN 60745; EN ISO 20643 - which they have to provide under the Supply of Machinery (Safety) Regulations 2008) are often used as the basis for "traffic light" risk ranking by hire companies. However, whilst useful as an initial estimate, you cannot use these figures for accurate risk assessment unless you can show that they are representative of your real-use tool vibration. Be particularly careful where the operator dose may be close to action or limit values as there can be serious consequences. Quoting the HSE guidance – “…you will still need to check with the manufacturer that the vibration emission declared in the equipment’s handbook is representative of your normal use of the equipment.” Consider the commercial pressure on suppliers not to go out of their way to publicise the higher vibration values often associated with real field use.

HAVBase can be used to aid optimum tool selection as part of a "Buy/Hire Smooth" policy to minimise HAVS risk.

Hand-Arm Vibration Measurement Accuracy – don’t measure unless you have to…

Accurate HAV measurement is time-consuming and expensive – and often unnecessary. In fact, you may never need to measure vibration again by heeding the HSE guidance that recommends using accurate published field vibration data wherever possible (e.g. HAV-Base). Incorrect transducer mounting and other technical mistakes have led to inaccurate field vibration measurements that can under-estimate vibration risk by factors of x2 to x20. We do measure, often, but take great care to ensure the data is valid.

Repeated Monitoring – and also repeated monitoring

Save your time and money. Once you have good data for your tools and operations, you never have to repeat the process unless you change tools or your operating procedures. Many companies spend a fortune on unnecessary repeat measurements, costly monitoring systems and procedures when it would better be spent on new, low vibration tools and other measures that actually reduce the risk.

Hand-Arm Vibration PPE – an oxymoron

There is no generally effective PPE for HAV, despite claims by some AV glove suppliers. In fact, it is often likely that so called “AV” gloves may actually increase the risk due to their effect on ergonomics.

no vibration measurement needed

Avoid the costs (time, training, instrumentation) and hassles associated with field HAV assessment by using our Virtual Assessment service based on our hand arm vibration database. Download our open source template tool register, fill it in, email it to our office and we can then provide you with a low cost vibration risk assessment from our HAVBase HAV database that complies with the HSE guidance recommending the use of accurate published vibration data wherever possible to avoid wasting resources on measurement.

The data can also be combined with additional on-site field vibration measurements if required to reduce assessment costs by around 70-80% and the time (and hassle of getting all the plant together) involved by up to 95%.

HAV traffic light

This is an important element of “best practice” in HAV risk management. The commonly used hire tool company HAV risk “traffic light” system is supposed to provide information to users about the relative risks from tools. Unfortunately, it can be dangerously misleading as it is based on manufacturers’ declared values that should not be used for risk assessment. Despite this fact, some hire company literature implies the data can be used for assessment. Relying on this data could leave employers open to claims as tools can be much higher risk than the colour coding suggests.

HAVBase aids selection of the best tools to buy or hire to minimise risk. It also provides you with the tools and information you need to implement “best practice” in risk management (statistics, combinations of tools, finger-on-trigger calculations, automatic risk recalculation to meet the regulations …) plus high quality, automated reporting and graphical representations of the data.

HAVBase Online Database – risk management made simple

HAVBase HAV vibration database.png

Our online HAVS database is a comprehensive risk assessment and management tool that includes accurate field data for a huge cross-section of tools and activities. This reduces the time, costs and resources required for accurate risk assessments by 80% or more in compliance with the HSE recommendation to use reliable published data wherever possible. It is much better to invest your time and resources in risk management rather than repeating placebo measurements that have already been made elsewhere.

HAVBase - low cost virtual assessment by email

Download and fill in our template tool register or email us your tool register for a rapid and very low-cost virtual assessment.

HAVBase Online - company HAVS risk management tool

HAVBase is a comprehensive online risk management tool that is specifically aimed at making risk reduction as simple as possible. It provides a central, easily updated repository for all HAV risk management data and procedures.

  1. A central tool register across the whole organisation that can also be split into subsets specific to each subsidiary (defined by the client). Also used for evaluations as part of the Buy/Hire Smooth procurement process.
  2. Upload measured or other new data that is automatically compared with statistics for similar INVC plant data as a "quality control" check - does the vibration value fall within the expected range for that tool and operation?
  3. Automated HAV risk assessment reporting in advance of any project: simply select tools, activities, estimated trigger times; add references; download automatically generated risk assessment report. Reduce reporting time from perhaps one day down to c 15 minutes.
  4. Use HAVBase statistics to optimise tool maintenance programmes
  5. Use HAVBase to aid Buy/Hire Smooth: a central resource to help make optimum plant selection decisions. Ranking of registered tools for each category of plant can be made accessible to procurement.
  6. Central online repository for linked policy documents, forms, training material etc
NoiseBase - occupational and environmental

NoiseBase is a HAVBase option. It adds the following facilities to combine vibration with noise data in the same database to simplify risk management. Note that it can also include noise data for other items of plant other than hand tools.

Occupational Noise

  1. Add noise data for any tool, including measurement location (at the ear or at a distance).
  2. Auto calculation of "safe working distance" within which PPE must be worn e.g. for tool tags and to simplify noise assessments on site. No knowledge of noise is required as the labelling indicates the degree of risk and the distances within which PPE must be worn.
  3. Auto generation of reports as for HAV
  4. PPE selection database - auto reporting re suitable protectors

Environmental Noise

The noise data can also be used to predict off-site noise levels from tool and plant operations.

Mobile HAVBase/Noisebase on Site

HAVbase and Noisebase are also designed for field use on a smartphone or tablet.

  1. Staff can check risk on site without measurement for changed circumstances or operational requirements.
  2. Update tasks and generate reports in the field.
  3. Unmarked tools can be risk assessed re safe working distance within which PPE must be used and the suitability of any PPE validated.

Note that a noise meter app is in beta that would also allow accurate assessment of noise levels.

The following is a step-by-step check list of the components of any effective HAV risk management programme that should be included in any risk assessment report. Contact us for more on any of the element(s) for which you need more information.

  1. Create a vibrating tool/plant register: always takes much longer and turns up many more tools than expected. Ensure there is sufficient information to define a tool and operation (“blue drill” is not sufficient!). At least make, model, accessory, the operation for which it is used and the material (metal, plastic, grass, scrub etc). Download and fill in our open-source HAV tool register and email to us to evaluate the assessment options for you (see below). Click here to download the free template HAV tool register.
  2. HAV risk assess – don’t measure unless you absolutely must. Surely everyone has already done this? The key HSE message is: “Don’t measure vibration unless you absolutely must”. Get a fast, very low-cost virtual assessment by email and use your resources to reduce risk instead.
  3. Implement an effective HAV risk management programme: include operational factors, working conditions, behaviour, ergonomics, symptom reporting systems etc. It does not include PPE as there is none.
  4. Reduce vibration via tool maintenance and vibration control measures: use HAVBase stats to evaluate which tools pose an increased risk as they wear to prioritise maintenance schedules. Increases in tool vibration from range from completely unaffected to very sensitive to tool condition. Retro-fit engineering modifications can substantially reduce vibration in some cases.
  5. Hire / Buy low vibration tools: base decisions on operational, productivity and ergonomic factors as well as levels of hand-arm vibration. Note: the common HAV traffic light system is based on manufacturers’ data that will often seriously underestimate risk.
  6. Training: as operator risk is very dependent on behaviour, training is an important risk management element – toolbox talks, management briefings and full HAV competency training as appropriate.
  7. Health Surveillance: introduce a programme for all workers likely to be exposed above the Exposure Action Value (A(8) of 2.5 m/s^2). This includes education, reporting system, health checks and communication.
  8. Audit the programme: check you are implementing best practice for all the elements above, in practice, not just on paper. We often find the audit will show disconnects between theory and practice and risk management can be improved in parallel with significant cost savings.
dennis grass mower vibration control

Manufacturers are under increasing commercial pressure from their customers to develop low vibration plant. The innovative low vibration handle developed by the INVC for a Dennis Mowers lawn-mower reduced operator exposure from 6m/s^2 down to 2m/s^2 – without compromising mower control. This is a dramatic improvement that would allow operators to use the mower all day without reaching the 2.5m/s^2 Exposure Action Value.

concrete lintel rammer vibration.png

A hand-held Ingersoll Rand sand rammer packing concrete lintel moulds generated 28m/s^2 with a maximum trigger time of only 15 minutes/day before reaching the ramming tool vibration control Exposure Limit Value, seriously limiting production. We designed a mass / sprung balance system that reduced the vibration to 11.5m/s^2, extending the “safe” trigger time to 90 minutes/day. Combined with substantial ergonomic improvements, operator HAVS risk was virtually eliminated and there were large productivity gains. As the whole project was completed within days (no site visit) via information (data, video) forwarded by email, the total cost was a few £hundred, making it self-financing over a few days.

Vibration from riveting on a bench jig posed a very high risk of HAVS. Our redesigned, stiffer jig reduced the riveting time by 50% and the vibration by 25%. This cut the overall operator dose by nearly 90% – improving productivity as a side effect.

Flash removal from hand-held aluminium components generated 32m/s^2 – the Exposure Limit Value (ELV) would be reached in 12 minutes, severely limiting production. Detailed analysis revealed dominant vibration was caused by a pedestal grinder component rest resonance. It was replaced by a floor mounted version that improved the ergonomics and reduced the vibration to 1m/s^2, allowing unlimited use without risk of HAVs.

The operator used a spanner on one side of conveyor frames and an impact wrench on the other, producing significant HAVS risk in both hands. We recommended a larger, more ergonomic spanner and a more powerful wrench. These measures halved the vibration dose and significantly improved productivity.

High-speed bits were used to trim aluminium panels, but the tool speed was far too low. Changing the die grinder for a high speed unit to match the bit left the vibration unchanged, but the improved efficiency cut working time from 20 minutes to 2 minutes, reducing the risk by a factor of three. On a similar operation, simply ensuring the grinding bit was pushed fully into the chuck reduced the level of vibration by a factor of x4.

Designing a shorter stirrer bar and reducing the speed  of a hand held paint stirrer reduced the 30m/s^2 vibration level to 8m/s^2 without affecting performance.

hav-maintenance-statistics

The costs of managing Hand-Arm Vibration risks can be reduced very substantially by introducing an effective "likely condition based" maintenance programme. We have used field vibration values for thousands of tools to generate statistics showing maintenance affects vibration. Standard breakers or rivet guns, for example, show little difference between the vibration from “as new” tools and that from old, worn tools. In contrast, poorly maintained angle grinders or leaf blowers generate several times the vibration of well maintained units (see graphic of the statistical spread of vibration levels).

This information can be used to improve your tool maintenance programme by concentrating resources only on those tools that pose the greatest risk if they are not well maintained to reduce the risk of HAVS.

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