Solutions for Risk Reduction

Transcription

1 Solutions for Risk Reduction

2 Noise Shaun Knott Construction Specialist Casella Measurement Directive 2003/10/EC Published Feb 15 th 2003 Revised October 2005 Solutions for Risk Reduction

3 Terminology Solutions for Risk Reduction

4 The Basics db A C Z Frequency Solutions for Risk Reduction

5 The Basics Solutions for Risk Reduction

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

7 So we need LAF MX LAF MN LA eq (Leq) LC pk L ep,d Ln90 Ln50 Measurement from the meter (steady) at normal operator position Measurement from the meter highest noise level recorded Calculated measurement based on actual time exposure from the LAeq Solutions for Risk Reduction

8 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 Solutions for Risk Reduction

9 What is Lep d Lep d is the actual exposure based on time exposed.

10 Working out Lep d Difference between 2 db Values (db) Add to Highest (db) Hours ½ ¼ >12 0 = 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 = 93 dba

11 LCpk Peak noise is the highest point measured and also has legislation as to its level. 90 L A TIME Solutions for Risk Reduction

12 The Basics LAeq LCpk Lep,d

13 Legislation Solutions for Risk Reduction

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

15 Lower Exposure Action 80dB(A) L EP,d 112 Pascals (L CPK = 135dB) Take action as in regulations

16 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

17 Upper Exposure Action 85dB LEP,d 140 Pascals (LCPK= 137dB) Take action as in regulations

18 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

19 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

20 New Exposure Tool Exposure points have replaced nomogram Meant to allow easier assessment of higher risk activities

21 Solutions for Risk Reduction

22 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

23 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.

24 The Competent Person Competent person will 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

25 Taking a Measurement Solutions for Risk Reduction

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

27 dbadge Weighs only 68g Measures Personal Exposure No cable Display & Visual alarms 2 Button operation Automatic calibration

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

29 Ear Defender Selection Solutions for Risk Reduction

30 Hearing Protection Solutions for Risk Reduction

31 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

32 LAeq Octave s less octave attenuation PNR = M-(H-M) / 4 x (LC - LA - 2) OR Lceq - SNR PNR = M-(H-M) / 8 x (LC - LA - 2) Solutions for Risk Reduction

33 Noise v- Health and Safety Health & Safety Noise 70 db A (Lep d) 87 db A (Lep d) 85 db A (Lep d) Solutions for Risk Reduction

34 Sound Level at Ear under HPE Noise level Inside the Protected Ear L A in db(a) Under Attenuation Good Attenuation Over Attenuation Solutions for Risk Reduction

35 Difference between 2 db Values (db) Add to Highest (db) >12 0 Solutions for Risk Reduction

36 K 2K 4K 8K Solutions for Risk Reduction

37 K 2K 4K 8K Solutions for Risk Reduction

38 K 2K 4K 8K Solutions for Risk Reduction

39 K 2K 4K 8K

40 EAR Flex 14 Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d XX dba

41 Optime 1 Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d XX dba

42 Express Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d XX dba

43 EAR Flex 14 Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d 89 dba

44 Optime 1 Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d 81 dba

45 Express Octave Band k 2k 4k 8k 16k db(a) Defender db(a) at Ear Lep d 76 dba

46 Narrowing down the available options Solutions for Risk Reduction

47 OR Solutions for Risk Reduction

48 Lets make it quieter Solutions for Risk Reduction

49 Noise Reduction Solutions for Risk Reduction

50 Engineered Noise Reduction Solutions for Risk Reduction

51 Implications Cost New assessment Review PPE Increase noise control Action plan Time

52 Questions Solutions for Risk Reduction

53 Shaun Knott Solutions for Risk Reduction