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Carl.Riva  
#1 Posted : 02 October 2018 10:31:10(UTC)
Rank: New forum user
Carl.Riva

I am after some information as I am confusing myself with all the information on the internet. I have a workplace that does instructional learning on the use of lathes (Metal cutting). I have found a report stating that they recorded 89dB but there is no other information. I understand anything over 85dB you have to have ear protection based on the average exposures (is anyone able to put that into simple talk). I visited the area and observed the noise was only generated for short periods and the lesson lasted for around 1 hour.

The problem I have is they have been instructed to wear ear defenders which the instructor dislikes as he is not heard by the students. I have looked into ear plugs but want to know what others think.

Roundtuit  
#2 Posted : 02 October 2018 10:52:16(UTC)
Rank: Super forum user
Roundtuit

The HSE published a ready reckoner to determine exposure http://www.hse.gov.uk/noise/dailyexposure.pdf based on noise level and duration

One hour at a noise level of 89 db(A) gives a points score of 32 equivalent to 80 dB exposure which puts you at the action level for providing instruction & information and making hearing protection available

As you have a reading opf 89dB(A) typically a protector with an SNR value of 20 or less shoud be adequate if your equipment has a higher SNR (>20) it may explain the problems with communication

Personally I would start with fresh measurements of level and duration especially if the room layout or equipment has altered since the date of the report you found and work from there.

thanks 1 user thanked Roundtuit for this useful post.
Carl.Riva on 02/10/2018(UTC)
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