Noise emissions ISO 12100

[pedrof]

Does anyone have experience of assessing noise from a machine?
We had a 12100 risk assesment done and it lists ISO/TR 11688-1 as the reference.
What are the limits of exposure/levels etc.?
Thanks

 

[Strong]

That ISO document does not list limits of exposure/levels.

Contents
1. Scope
2. References
3. Definitions
4. Methodical design and acoustic aspects
5. Conceptual and detailed design
6. Low-noise prototyping
Annexes
A Summary of design rules
B Noise control requirements for design
C Information to be reported
D Bibliography

You will have to be a lot specific with your question to get any halp.

Walt

 

[tygerdawg]

I don't have specific regulations and guidelines in front of me, so consider this as approximate summary of US OSHA guidance. I would guess that ISO regulations are similar. You can do your own research to confirm. Hire a qualified consultant to be sure. Don't take chances: hearing loss is permanent.

If I recall correctly, after a noise source in a work environment produces a level of 84(??) dBA, then noise protection is required of workers exposed to that noise level. At some point (dBA level) a formal hearing protection program must be implemented. Mitigation of the noise hazard should follow the order of precdence:
[ul]
[li]Elimination of the noise hazard[/li]
[li]Engineering solutions to reduce or eliminate.[/li]
[li]Administrative methods to reduce (e.g., work schedules, SOPs, reduce-by-distance, etc.)[/li]
[li]Personal Protective Equipment (and keep in mind that hearing protection is rated for noise attenuation levels so all devices are not equal)[/li]
[/ul]

Worker noise exposures are assessed by a Time Weighted Average TWA calculation and limited by Permissible Exposure Limits PELs.

If the work environment has multiple noise sources (e.g., a work cell with multiple machines generating noise) then there is a specific calculation method to determine the net resultant noise level to which the worker is exposed. It is NOT additive due to the nature of noise/sound. For example, an increase of 3dB of measured sound level is a doubling of the noise. Noise levels are also dependent upon the distance from the source.

TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering

http://www.bluetechnik.com