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Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
Lecture  6-_noise_hazard
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Lecture 6-_noise_hazard

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  • 1. Topic 5: Noise Hazard Topic Learning Outcome : 1)Explains the characteristic of sound and vibration and its risk. 2) Describe the identifying and assessing of noise hazard in industries and its control and prevention strategies.
  • 2. TOPIC CONTENTs: 5.1 Characteristic of sound and vibration 5.2 Hazard level and its risk 5.3 Identifying and assessing hazardous noise in industries 5.4 Noise hazard control and prevention strategies.
  • 3. 5.1 Characteristic of sound and vibration  Sound is any change in pressure that can be detected by ear. Noise is unwanted or damaging sound that may damage our hearing . dB (DECIBEL): The unit used to express the intensity of sound. The decibel scale is a logarithmic scale in which the threshold of discomfort is between 85 and 95 dB and the threshold for pain is between 120 and 140 dB . Frequency dB
  • 4. Acceptable Noise(dBA) Location Effects Maximum Leq (dBA) Time (hours) Time of day Bedroom sleep disturbance, annoyance 30 8 night Living area annoyance, speech interference 50 16 day Outdoor living area moderate annoyance 50 16 day Outdoor living area serious annoyance 55 16 day Outdoor living area sleep disturbance, with open windows 45 8 night School classroom speech interference, communicatio n disturbance 35 8 day Hospitals patient rooms sleep disturbance, communicatio n interference 30 - 35 8 day and night
  • 5. 5.1 Characteristic of sound and vibration Types of sound signals The types of sound has a bearing on how it is to be measured, what type of sound level meter setting should be used and what descriptors and other data should be presented.
  • 6. 5.2 Hazard level and its risk According to Factories and Machinery (Noise Exposure) Regulation 1989, Permissible Exposure limit :  Noise level for 8 hour shift not exceeding equivalent steady sound level 0f 90 db.  Intermittent noise not exceeding 115dB at any time.  Impulsive noise not exceeding a peak sound pressure level of 140 dB. Safe 85dB 90dB 115dB 130dB Permissible Exposure limit Danger, Disclosure is prohibited Threshold of pain Hearing loss
  • 7. 5.2 Hazard level and its risk Caution!! Deafness caused by noise can not be cured
  • 8. 5.3 Identifying and assessing hazardous noise in industries  Noise identification and assessment may be simple or complex, depending on the type of workplaces, number of workers and the information already available regarding noise exposure level. The general aim of a noise assessment is to: • Identify all persons likely to be exposed to excessive noise. • Obtain information on noise sources and associated work practices. • Check the effectiveness of measures taken to reduce noise exposure or the risks from noise exposure. • Help choose appropriate personal hearing protectors for persons exposed to risks from excessive noise; and • Define hearing protection areas at work.
  • 9. 5.3 Identifying and assessing hazardous noise in industries  Identifying and assessing hazardous noise in the workplace involve : 1) Conduct noise survey 2) Audiometric testing – measure the threshold of employees. 3) Keeping record for individual employees 4)Follow up on the critical Audiometric testing equipment
  • 10. 5.3 Identifying and assessing hazardous noise in industries Types of equipments used in measuring sound
  • 11. 5.3 Identifying and assessing hazardous noise in industries . Example of Noise hazard Identification checklist
  • 12. 5.3 Identifying and assessing hazardous noise in industries . Example of Noise Mapping
  • 13. 5.4 Noise hazard control and prevention strategies.  When reducing noise exposure, preference is given to engineering controls, then administrative controls and finally the use of appropriate PPE. Engineering control - Must be considered during the design stage of a new facility or the expansion of facility Substitution • Replace noisy equipment with quieter Modification • Modify the way in which the equipment operates so that it generates less noise. Isolation • Having them work in enclosed room. •Segregate noisy areas with sound barriers Maintenance •Maintenance of equipment and the engineering controls that have been implemented is very important or the improvements in noise level will be lost.
  • 14. 5.4 Noise hazard control and prevention strategies. Administrative control Rotating work schedules or changing production schedules • purposely to have amount of time that a worker is exposed to noise is within acceptable limits Provision of training • Noise awareness training Warning sign • Warning sign at all entrances to the high noise area Conducting Audiometric test • A test to determine employees hearing threshold or ability PPE Providing appropriate PPE • if reductions in noise level and exposure time have not reduced, then appropriate hearing protection must be provided according to the standard

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