The central reference document in the UK for the monitoring and assessment of industrial noise is BS4142: 1997: 'Method for Rating Industrial Noise Affecting Mixed Residential and Industrial Areas'.
BS4142 has been in existence for many years during which time it has undergone a number of revisions.
It is based on the principle of comparing the specific industrial noise concerned to the background noise which prevails or would prevail at potentially affected sensitive locations, typically
residential properties in the vicinity of the noise source.
The specific noise is monitored or predicted in terms of dB LAeq,T, with a correction of +5 dB being added for noise from sources which include significant tonal (eg whine, hiss, screech, hum etc) and/or impulsive components (eg bangs, clicks, clatters, thumps etc). The specific noise level plus the tonal/impulsive correction where appropriate is referred to as the "rating level".
The background noise level is monitored in terms of dB LA90,T for time(s) of the day and/or night when the noise is present.
The background level is then subtracted from the rating level and BS4142 then predicts the likelihood of complaints arising as follows:
The greater the difference the greater the likelihood of complaints.
A difference of around 10 dB (ie rating level 10 dB above background) indicates that complaints are likely.
A difference of around 5 dB (ie rating level 5 dB above background) is of marginal significance.
If the rating level is more than 10 dB below the measured background noise then this is a positive indication that complaints are unlikely.
These assessment criteria are also frequently employed in the assessment of noise from commercial but non-industrial sources such as pubs and clubs. They may also employed for the assessment of
noise from permanent or semi-permanent outdoor noise sources such as landfills and waste handling facilities.
Auracle Acoustics is able to undertake all aspects of the monitoring, prediction and assessment of industrial noise and noise from other commercial premises in accordance with national guidance such as BS4142 and the specific requirements of local planning authorities, including the preparation of acoustic reports to support planning applications and liaison as required.
Information on the various means of controlling and mitigating against noise from industrial and other commercial noise sources may be found on the Noise Control page.
Copyright © 2003-2006 Owen Clingan - Auracle Acoustics