Dear Dipil,
You are correct.
The work place monitoring is done for TWA (Time weighted Average) for 8 Hours.
This is true for exposures of dust as in your case also becomes critical for exposures to various chemicals. Such monitoring is called workplace monitoring as per Factories Act Second Schedule.
There is another term called STEL (Short Term Exposure Limit) which is for 15 minutes. The STEL limits are slightly more than TWA limits.
The exposure of the operator is for TWA or for STEL is decided by what he does.
To explain this situation the following example would be useful.
If we take a case of pollution on road signals, the traffic police is exposed for 8 hours as he does duty all the time in polluted area, however a vehicle passing through that signal point the driver is exposed only for 15 minutes, hence here for the driver STEL would be applicable.
In the above example of noise monitoring according to my view, as long as the process does not change, the noise level may not change. More over the noise is usually measured at 1 meter distance from the source. This should be OK.
Request the members having exposure to continuous process plants and cases of variations in noise levels to share their experience.
Thanks & Regards,
Sudhir
You are correct.
The work place monitoring is done for TWA (Time weighted Average) for 8 Hours.
This is true for exposures of dust as in your case also becomes critical for exposures to various chemicals. Such monitoring is called workplace monitoring as per Factories Act Second Schedule.
There is another term called STEL (Short Term Exposure Limit) which is for 15 minutes. The STEL limits are slightly more than TWA limits.
The exposure of the operator is for TWA or for STEL is decided by what he does.
To explain this situation the following example would be useful.
If we take a case of pollution on road signals, the traffic police is exposed for 8 hours as he does duty all the time in polluted area, however a vehicle passing through that signal point the driver is exposed only for 15 minutes, hence here for the driver STEL would be applicable.
In the above example of noise monitoring according to my view, as long as the process does not change, the noise level may not change. More over the noise is usually measured at 1 meter distance from the source. This should be OK.
Request the members having exposure to continuous process plants and cases of variations in noise levels to share their experience.
Thanks & Regards,
Sudhir