physical agents (noise) directivebtckstorage.blob.core.windows.net/site1476/may...
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Think Environment Think Casella
Physical Agents (Noise) Directive
Shaun Knott
Noise Instrumentation
Casella CEL Ltd
Directive 2003/10/EC
Published Feb 15th 2003
Revised October 2005
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Think Environment Think Casella
The Basics
Z
A
C
Frequency
dB
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Think Environment Think Casella
The Basics
Z
A
C
Frequency
dB
1KHz
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Think Environment Think Casella
The Best Excuse EVER ! ! !
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Think Environment Think Casella
The Basics
L= Level, A,C,Z= Weighting F,S,I = Speed The
measurement
L A F MX
LAF MX LC pk
LAF MN LA eq (Leq)
L ep’d
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Think Environment Think Casella
The Basics
L= Level, A,C,Z= Weighting F,S,I = Speed The
measurement
L A F MX
LAF MX LC pk
LAF MN LA eq (Leq)
L ep’d
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Think Environment Think Casella
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
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Think Environment Think Casella
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
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What is Lep’d Lep’d is the actual exposure based on time exposed.
Hours Level
12 92 103 86 97 116
8 90 101 84 95 114 LAeq
7 89 100 83 94 113
6 89 100 83 94 113
5 88 99 82 93 112
4 87 98 81 92 111
3 86 97 80 91 110
2 84 95 78 89 108
1 81 92 75 86 105
½ 78 89 72 83 102
¼ 75 86 69 80 99
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Think Environment Think Casella
LCpk Peek noise is the highest point measured and
also has legislation as to its level.
70
80
90
TIME
LA
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Think Environment Think Casella
Below Lower action level Employer must:
• Reduce risks to lowest practicable level
• Keep records and make them available including
audiometry (if done)
• Buy quiet
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Think Environment Think Casella
Lower Exposure Action
• 80dB(A) LEP,d
• 112 Pascals (LCPK= 135dB)
• Take action as in regulations
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Think Environment Think Casella
Above Upper action level
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
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Think Environment Think Casella
Upper Exposure Action
• 85dB LEP,d
• 140 Pascals (LCPK= 137dB)
• Take action as in regulations
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Think Environment Think Casella
Above Upper action level
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
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Think Environment Think Casella
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
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Think Environment Think Casella
New exposure tool
• Exposure points have replaced nomogram
• Meant to allow easier assessment of higher risk activities
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Think Environment Think Casella
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Think Environment Think Casella
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
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Think Environment Think Casella
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.
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Think Environment Think Casella
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
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Think Environment Think Casella
S.L.M. or Dosimeter?
• Two main types of instrument are used to
perform workplace noise assessments
– Sound Level Meter (SLM)
– Dosimeter
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Think Environment Think Casella
dBadge
• Weighs only 68g
• Measures Personal Exposure
• No cable
• Display & Visual alarms
• 2 Button operation
• Automatic calibration
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Calibrators
• All instruments should be
calibrated prior to
measurement
• CEL-110
• Class 1 or 2
•Automatically adjusts for cavity
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Think Environment Think Casella
Hearing Protection
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Think Environment Think Casella
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
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Think Environment Think Casella
PNR = M-(H-M) / 4 x (LC - LA - 2)
OR
PNR = M-(H-M) / 8 x (LC - LA - 2)
LAeq Octave’s less
octave attenuation
Lceq - SNR
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Think Environment Think Casella
NOISE -V- HEALTH AND SAFETY
87 dB A (Lep’d) 70 dB A
(Lep’d)
Health
&
Safety
Noise
85 dB A (Lep’d)
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Think Environment Think Casella
Under Attenuation
Good Attenuation
Over Attenuation
85
80
75
70
Noise level
Inside the
Protected
Ear
L’A in dB(A)
Sound Level at Ear under HPE
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Think Environment Think Casella
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Think Environment Think Casella
Lets Make it
Quieter
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Think Environment Think Casella
Engineered Noise
Reduction
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Think Environment Think Casella
Implications
• Cost
• New assessment
• Review PPE
• Increase noise control
• Action plan
• Time
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Think Environment Think Casella
Questions ?
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Think Environment Think Casella
Contact Shaun Knott
01234 844100
07730 818267