Health and Safety Executive

Health and Safety Executive

Kent Health & Safety Group

Meeting.

Delphi Diesel Systems

Courteney Road

Gillingham

Kent.

Session.

Assessment and control of hand-arm vibration.

What is in this session?

• HAVS risk assessment

• Hierarchy of control

• Examples of practical control of risks from hand-arm vibration

RISK ASSESSMENT.

‘An assessment is adequate if it provides enough information to enable you to decide

whether your employees’ exposures are likely to be above EAV or ELV and to take the most appropriate action to control the

exposure.’

Helps to target the highest exposure processes (biggest gain)

Rules of thumb?

High risk Medium risk

More than 1 hour

More than 1 hour

More than 2 hour

More than 15 minutes

What do employers need to do to estimate vibration exposure?

• Need vibration emission from the tool(s)

• Also time of exposure

• Combine to obtain daily exposure A(8) in m/s2

Getting more realistic vibration data!

• Employers should check if manufacturers’ emission data is representative of tool use?

• If not they can;– Ask their supplier– HSE Guidance– Trade Associations,

consultancies, government– Measurements (ISO 5349 parts 1

and 2)

HSE Website Exposure Calculator.

HAND-ARM VIBRATION EXPOSURE CALCULATOR

Vibration Time to reach EAV Time to reach ELV Exposure Partial Partial

magnitude 2.5 m/s2 A (8) time in min5 m/s2 A (8) time in minduration time in minsexposure partial expexposure

m/s² r.m.s. hours minutes hours minutes hours minutes m/s² A (8) points

Tool or process 1 0 0

Tool or process 2 0 0

Tool or process 3 0 0

Tool or process 4 0 0

Tool or process 5 0 0

Tool or process 6 0 0

Instructions for use: Daily Total

exposure exposure

Enter vibration magnitudes and exposure durations in the white areas. m/s² A (8) points

To calculate, press the Enter key, or move the cursor to a different cell.

The results are displayed in the yelllow areas.

www.hse.gov.uk/vibration

HSE Exposure Points Method.

• Alternative equally effective method to using the calculator;

• Straightforward to use – especially, by employees;

• Exposure Action Value = 100 points

• Exposure Limit Value = 400 points

CONTROL Measures?

Think creatively about the job.

Put systems in place early.

Hierarchy of control!

• Elimination;

• Substitution;

• Engineering control;

• Exposure management;

• Information, instruction and training.

Elimination.

Breaking

Scabbling

Elimination continued…

Old: Pneumatic pickSlow process with exposure to noise, vibration, dust, heat

Foundry furnace lining removal

New: Hydraulic push-outSafer process with shorter down time

Elimination by design ….

Eliminating the need for fettling

Green sand casting Lost foam casting

Elimination by design continued…

In construction the biggest reduction in exposure can be achieved in the design stage – i.e., Construction (Design & Management Regulations 2007).

Substitution ….

Choose the right powered hand-tool – i.e.:

• Is it the best tool for the job (suitability and efficiency)?

• Ask the tool users?

• Is it low vibration?– use manufacturers’

data to make first estimate of exposure;

• Implement purchasing / hiring policy.

Engineering control?

Benefits include:

• Reduces and/or eliminates vibration exposure;

• Good ergonomics;

• Increased productivity.

Exposure management!

• Specify maximum exposure times:

• Job rotation– Share exposure– Non-vibration tasks

• Need to take account of:– Productivity – what are you asking the

workers to do?– Communication– Supervision– Bonus

‘Anti-vibration’ Gloves.

• Potential loss of dexterity and/or control;

• Unlikely to reduce the A(8);

• Assume they offer no protection.

However:

• Use gloves to keep hands warm.

Maintenance.

• Regular maintenance program;

• Return tool policy;

• Raise awareness of the risks from poorly maintained tools;

• Attachments:– Suitability– Sharp– Replacements.

Examples of vibration reduction.

• Demolition without vibration– Use crushers instead of demolition

hammers

Remove the need for hand-tunnelling.

New liner fitted by expanding and bursting old pipe, which eliminates manual excavation and back-filling.

Bursting concrete

Initially, core holes are required in the concrete, to install the Burster wedge to begin the cracking process.