when dispensing liquid nitrogen from bulk tank, or simply existing in any (work area) location where the sound level exceeds 80 dB*. Other operations likely to require hearing protection are operation of heavy earth-moving and construction machinery (e.g. backhoe) and equipment (e.g. jackhammer), power tools, lathes (wood or metal), precision machining and metal-working equipment.
a means of attenuating noise to below damaging levels when and where it is not possible to reduce them through engineering. Ear covers (also known as earmuffs or headsets) and insert-type earplugs (formable, premolded, or custom molded, and of many different shapes and compositions) are the hearing protection devices which exist. All staff exposed to noise requiring hearing protection must also participate in the Universities Hearing Protection program. Contact REM at 46113.
Earplugs: Always read the instructions supplied with the earplugs. Some earplugs for example the compressible foam type come in only one size. If the plugs are made in several sizes, you need the right size for each ear. To insert plugs:
|If plugs are compressible foam type:|
|Remember -- Plugs can work loose and may need to be repositioned
occasionally. Remove plugs slowly so that suction does not hurt your ear.
Earmuffs: Inspect the muffs and note which way they are meant to be worn. Some earmuff cups are marked top or front and should be worn that way. Oval shaped cups are meant to be worn so that the oval is vertical.
| Proper hearing protection can only be chosen with the help of a
professional. The noise reduction ratio must be chosen for the work, after
assessment, and the fit must be evaluated by someone who knows what he's/she's doing.
(Do not just go choose something and stick it on or in your ears.) Earmuff
performance may be degraded by anything that compromises the cushion-to-flesh seal,
including other pieces of personal protective equipment such as eyewear, masks,
faceshields, and helmets. The maximum sound attenuation afforded by hearing
protection devices is limited by human body and bone conduction mechanisms. Even though a
particular device may provide outstanding values of noise attenuation the actual noise
reductions may be less because noise surrounding the head and body bypasses the hearing
protector and is transmitted through tissue and bone pathways to the inner ear.
It takes two to three weeks to get used to wearing hearing protectors.
Once you are used to them you will, feel less stressed while youre working, feel
less tired at the end of the day, and know your hearing is safe.
|Keep muffs and plugs clean with soap and water. As soon as plugs become hard or damaged get a new pair. Dont stretch the headband of your earmuffs it makes them less effective. Replace the cushions on your earmuffs as soon as they start to harden. If your earmuffs are damaged get the damaged part replaced.|
* See noise comparison chart for info on decibel levels. Contact REM to request noise level evaluation. If hearing protection is waranted for your operation, they will advise on the best choice.