0
"Permitted Exposure Time Guidelines - SPL"
Sound pressure level Lp and permissible exposure time t:
115 dB = 0.46875 minutes (~30 sec)
112 dB = 0.9375 minutes (~1 min)
109 dB = 1.875 minutes (< 2 min)
106 dB = 3.75 minutes (< 4 min)
103 dB = 7.5 minutes
100 dB = 15 minutes
97 dB = 30 minutes
94 dB = 1 hour
91 dB = 2 hours
88 dB = 4 hours
85 dB = 8 hours
82 dB = 16 hours
Lower dBs are said to be harmless
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Is the day to day or hour to hour changes in atmosphere?
climate
What fraction of the day is a hour and half an hour?
Since a day has 24 hours, each hour is 1/24 of a day.
How many dollars per day are in 75 cents per hour?
That's six dollars for an eight hour day.
How many times a day do the hour and minute hands on a clock line up exactly with each other?
Once every hour, so 24 times in a 24-hour day.
When you are given a RX that states three times a day does it mean in a 12 hour day or 24 hour day?
"Day" always means 24 hours, at least on Earth. You take your Rx three times ... spaced as evenly as possible ... during whatever part of the 24-hour day you're awake.
What is OSHA's noise limit?
Effectively, OSHA has two noise limits that apply simultaneously. First, employees may not be exposed to a full-shift (8-hour) time-weighted average noise level of 90 dB (deciBells) or more. This translates to a limit of: 90 dB averaged over an 8 hour day, or 95 dB for 4-hours as long as the rest of the day does not involve exposure to noise greater than 90 dB, or 100 dB for 2 hours, 105 dB for 1-hour, 110 dB for 30 minutes, 115 dB for 15 minutes, and no continuous noise louder than 115 dB In addition, employees who have 8-hour exposures of 85 dB or more must be placed in a Hearing Conservation Program and, in some cases must be provided with hearing protection. The table is a bit different because sounds from 80 dB and above are used in the assessment. This translates to a criterion level of: 85 dB averaged over an 8-hour day, or 90 dB for 4-hours for 4-hours as long as the rest of the day does not involve exposure to noise greater than 80 dB, or 95 dB for 2 hours, 100 dB for 1 hour, 105 dB for 30 minutes, 110 dB for 15 minutes
What is the current noise standard being enforced by OSHA?
The OSHA Permissible Exposure Limit (PEL) for Noise is 90 dBA taken as an average over an 8-hour working day. If large portions of the work day do not involve exposure to noise, the averaging results in permitting louder noise for shorter exposure times.PEL .... Time Exposed during one day90 ...... 8 hours95 ...... 4 hours100 .... 2 hours105 .... 1 hour110 ..... 30 minutes115 ..... 15 minutesUnprotected exposures over 115 dBA not permitted. All the above presumes no exposure over 90 dBA during the rest of the work shift.In addition, if the daily average noise exposure exceed 85 dBA, each person likely to be so exposed must be part of a hearing conservation program involving training, periodic hearing testing, and availability of hearing protectors. A similar table as above applies, but beginning at 85 dBA for 8 hours and going to 80 dBA for 4 hours, etc. These levels presume no exposure over 80 dBA during the rest of the work shift.(Note the no exposure presumption is different for Hearing conservation than for the basic PEL)
What do the letters TLV-TWA stand for in a material safety data sheet?
The letters TLV stand for Threshold Limit Value, an exposure level for hazardous materials in air that it is believed can be experienced day after day for a working lifetime without ill effect. The TLVs are recommendations issued by a committee of experts through the American Conference of Governmental Industrial Hygienists. The letters TWA stand for time-weighted average, and usually refer to an average exposure over an 8-hour working day. It is intended to distinguish between that sort of long-term exposure measure and shorter exposure measures such as a 15-minute average exposure or a ceiling limit not to be exceed more than twice during a working day. The letters TLV-TWA, then, refer to a recommended maximum exposure level, expressed as an average over an 8-hour day.
What is the allowable percentage of associate to full membership within a club?
It is when you day revrn0use the com
How much money do fashion designers make a day?
Salaries for fashion designers depend on experience, talent and exposure. Beginning designers can make around $50,000 a year, which is about $25+ an hour. Famous fashion designers can make millions a year, hundreds of dollars an hour.
Is the day to day or hour to hour changes in atmosphere?
climate
What fraction of the day is a hour and half an hour?
Since a day has 24 hours, each hour is 1/24 of a day.
Each day and hour bring news or Each day and hour brings news?
Each day and hour brings news.
If you have a 7 hour day and your in fourth hour is the day almost over?
Yes because you day is half over at 3rd hour.
What is temperature and wind from hour to hour or day to day?
They are meteorological measurements.
When its day light saving time does it subtract 1 hour from day or add 1 hour for day?
2
Can working in transport wind cold and loud noises for 29 hour shifts with no rest in stressful conditions getting abused cause tinnitus ringing in the ears?
Any prolonged exposure to loud noise can cause sensorineural hearing loss and result in tinnitus. There was a study recently published that has shown concern for people even using MP3 players for more than 1 hour per day because it may cause sensorineural hearing loss, resulting in tinnitus early and deafness later.
