1 / 23

OCCUPATIONAL H YGIENE SOCIETY OF IRELAND

OCCUPATIONAL H YGIENE SOCIETY OF IRELAND. 17 th Annual Conference REACHing for Control. Getting Below 80. Colin Doyle, ANV Technology. 80 dB(A) is Not Very Loud. Busy restaurant 80 dB(A). Engineering Noise Control. Maintenance Screens Enclosures Silencers Vibration Isolation

sidl
Download Presentation

OCCUPATIONAL H YGIENE SOCIETY OF IRELAND

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OCCUPATIONAL HYGIENE SOCIETY OF IRELAND 17th Annual Conference REACHing for Control

  2. Getting Below 80 Colin Doyle, ANV Technology

  3. 80 dB(A) is Not Very Loud Busy restaurant 80 dB(A)

  4. Engineering Noise Control • Maintenance • Screens • Enclosures • Silencers • Vibration Isolation • Vibration Damping 3 dB 5 dB 10 dB 10 dB 5 dB 5 dB

  5. dB Scale for Noise Control Note: can add reductions directly e.g. 5 dB reduction through enclosing a source, and 3 dB reduction through reduced exposure time is an 8 dB reduction overall 5dB + 3dB = 8dB reduction

  6. machine Noise Screens Reduction: 3 to 6 dB Works well for high-frequency noise

  7. Noise Enclosures 90 dB(A) X 80 dB(A) 75 dB(A)

  8. Enclosure Specifications • Any panel material, mass>10kg/m2 • Isolate machine from panels • Limit openings : 10% for 10 dB reduction • Line 50% inside with sound absorber • Design for easy access/removal

  9. Examples of Enclosures Packagingmachine

  10. silencer Sound Absorption Inside Enclosures • Most of sound reduction is provided by mass of enclosure • But will need absorption if there are openings Absorbers: glass-fibre, mineral wool, polyurethane foam, melamine foam

  11. Fan/Duct Silencers 10 to 30 dB reduction to workplace FAN silencer

  12. Image in ceiling reflected Image in floor machine machine machine Sound Absorbing Ceilings/Walls direct

  13. ABSORBING CEILINGS Work only for reflected sound – no effect on direct sound -2 to -5 dB no reduction

  14. Vibration Isolation and Damping Vibration Isolators (springs/pads) Vibration damping Rubber/bitumen-type layer

  15. Examples of Noise Absorbers

  16. Examples of Vibration Isolators/Dampers

  17. vibration damping of chutes

  18. silencer vibration isolators

  19. Other Noise Controls • Relocate workers • Relocate machines • Alternative manufacturing processes • Automation • Noise refuges

  20. Noise Control Planning

  21. Noise Reduction4 Actions you take now • Issue noise specifications for new machines • Recruit the noise control team • Set noise reduction targets • Get a sound level meter

  22. Suggested Noise Specification …... Sound Power Noise label

  23. OCCUPATIONAL HYGIENE SOCIETY OF IRELAND 17th Annual Conference REACHing for Control

More Related