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Noise

Noise. Shaun Knott Casella Measurement Directive 2003/10/EC Published Feb 15 th 2003 Revised October 2005. The Basics. The Basics. L A F MX. L= Level, A,C,Z= Weighting F,S,I = Speed The measurement. LAF MX LC pk LAF MN LA eq (Leq) L ep’d. What is LAeq.

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Noise

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  1. Noise Shaun Knott Casella Measurement Directive 2003/10/EC Published Feb 15th 2003 Revised October 2005

  2. The Basics

  3. The Basics L A F MX L= Level, A,C,Z= Weighting F,S,I = Speed The measurement LAF MX LC pk LAF MN LA eq (Leq) L ep’d

  4. What is LAeq LAeq is the amount of noise we would be exposed to if we stayed in the same area for 8 hours It is not our actual exposure However We need LAeq to calculate our exposure. Some noise meters do not give LAeq and therefore should not be used. When measuring we use the meter to give us a Steady Measurement or if that’s not possible we measure one complete cycle

  5. Adding dB’s 80dB + 80dB Doesn’t = 160dB

  6. Working out Lep’d = 86 + 92 We take the difference between the two (6) using the table look at the amount to be added (1) and add it to the higher So 86 + 92 = 93 dBA

  7. LCpk Peek noise is the highest point measured and also has legislation as to its level.

  8. The Basics Laeq to get Lep’d and LCpk

  9. Below Lower action Employer must: • Reduce risks to lowest practicable level • Keep records and make them available including audiometry (if done) • Buy quiet

  10. Lower Exposure Action • 80dB(A) LEP,d • LCPK= 135dB • Take action as in regulations

  11. Above Lower action Employer must: • Identify all employees at risk • Put up signs • Review if any changes to noise levels • Repeat assessment <2 years • Inform employees of risk • Provide choice of PPE on request (first aid) • Provide training / education • Noise Control

  12. Upper Exposure Action • 85dB LEP,d • LCPK= 137dB • Take action as in regulations

  13. Above Upper action Employer must: • Demarcate as Noise Hazard Zones • PPE must be used at all times • Noise control to reduce exposure • If Lepd is over 95dBA then must use octave band method to check if hearing protection is effective Note: For peak action level, take the same action as for second action level

  14. Exposure limit value • 87dB(A) LEP,d exposure limit • 140dB LCPK exposure limit (200 Pascals) • Is the maximum permissible estimated operator noise dose whilst wearing (and not wearing) hearing protection • Value at the ear after taking into account any PPE • Therefore necessary to calculate effectiveness of PPE • NOT a target, but minimum acceptable • Target these individuals first

  15. Risk Assessment • Assess risks to Health and Safety • Done to identify actions to reduce risks • Necessary when lower action levels likely to be exceeded • Should assess exposure, measure if likely to be above second action levels

  16. Audiometry • Employees over the second action level have the right to a hearing check (audiometric test) As a preventative measure individuals who may be susceptible to noise below this level should also be tested e.g. those with previous damage.

  17. The ‘competent person’ • Competent person does not appear in regs • Risk assessment/control measures to be competently planned and carried out • Rely on ‘expert intermediaries’ for advice and services where necessary • Guidance will be given to judge when advice is needed

  18. S.L.M. or Dosimeter? • Two main types of instrument are used to perform workplace noise assessments • Sound Level Meter (SLM) • Dosimeter

  19. dBadge • Weighs only 68g • Measures Personal Exposure • No cable • Display & Visual alarms • 2 Button operation • Automatic calibration

  20. Calibrators • All instruments should be calibrated prior to measurement • CEL-110 • Class 1 or 2 • Automatically adjusts for cavity

  21. Taking a measurement • What to Measure • When to measure • How to Measure • What to ask the person being Measured • How to ask them • What to write down

  22. Taking a measurement • So now we should have • Their Name • What there doing and how they do it • Where you measured it • Who is working with or near them • How long they do it for • The LAeq and LCpk • HML or Octave values

  23. The Results

  24. The Results • So what do we do now we have all this information, What do we actually do with it • Write a report ! ! ! ! • What do we put on the report • Who is the report for • What action to take on the findings • Can we make it quieter and not use PPE

  25. Hearing Protection

  26. What do we need to measure for correct hearing protection Octave band method Needs frequency analyser 31.5Hz - 8KHz • HML Method Needs C and A weighted LEQ • SNR Method Needs C weighted LEQ Octave band is the preferred method

  27. LAeq Octave’s less octave attenuation PNR = M-(H-M) / 4 x (LC - LA - 2) OR PNR = M-(H-M) / 8 x (LC - LA - 2) Lceq - SNR

  28. Health & Safety Noise 70 dB A (Lep’d) 87 dB A (Lep’d) 85 dB A (Lep’d)

  29. Available Options

  30. Or

  31. Lets Make it Quieter

  32. Engineered Noise Reduction

  33. Thankyou Questions 07730 818267

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