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BS4142 Noise Survey & Assessments – A Practical Guide

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How do I find out what BS4142 is?

The British Standard BS 4142: 2014 – Methods of rating and evaluating commercial and industrial sound can be used to aid in the evaluation of sound from industrial and commercial nature. It offers methods to rate and evaluate the sound of an industrial or commercial nature. These include:

Sound that comes from manufacturing and industrial processes
Sound generated by fixed electrical and mechanical plant as well as equipment. This typically includes air conditioning units as well as extraction systems.
The sound of load and de-loading of items or materials on industrial or commercial locations
Sound produced by mobile plants and vehicles is an integral component to the sound that emanates from processes or premises like forklift trucks, or is generated by ship or train movement within and around an industrial or commercial location.

The method for assessing industrial noise that is described in BS 4142 is based on the differences between the measured background sound level that is free of the impact on any source of industrial sound and the rating level that the source of industrial noise at the location of the receiver. The BS4142:2014 document states: “The significance of sound of commercial and industrial nature is dependent on the degree to which the rating level of the particular source of sound exceeds what the sound levels of background as well as the setting in which the sound originates”. A measure of the impact of the sound can be determined using the difference between the level of the rating sound as well as the level of background noise looking at the following factors:

“Typically the more significant the difference in magnitude, the greater the impact in the force.”
“A variation of +10dB or more could indicate an adversely significant impact in the right context.”
“A variation of about 5dB could indicate negative impact, based on the situation.”

“The lower the rating is in relation to the background sound level the more likely it is that the particular sound source has an adverse impact or have a significant adverse effect. When the rating level is not surpass what is the level of background noise, it indicates that the sound source’s not having any impact, dependent on the setting.”

What is the reason you require an BS4142 Noise assessment?

Noise surveys conducted under BS4142 are designed to determine the potential effects of commercial and industrial noise sources in noise sensitive areas. Therefore, if you’re installing plant equipment that is external to your premises that includes extraction units, air conditioning generators, or other systems on your commercial property. This Local Authority will request a Noise assessment under BS4142 to be carried out to ensure that the impact of noise on the nearest sensitive building is reduced to an acceptable level. The BS4142 rules also apply for new buildings that are sensitive to noise, like apartments or houses for residential use as well as schools, healthcare facilities or hotels, located in close proximity to commercial or industrial noise sources.

An BS4142 noise report is required at the time of the application of planning permission in the event that it is determined that the Local Authority considers noise to pose a risk that is high enough to influence the chances of the application being granted. It could also be subject to condition in the approval for planning permission. The information contained in the noise survey report permits planners and environmental health departments to determine the degree of noise impact anticipated from the development and to ensure that appropriate noise-control measures are put in put in place.

In the end, the goal in this BS4142 the noise study is verify that the proposed development is in line in accordance with National Planning and Policy Framework and Noise Policy Statement for England.

Common Planning Conditions?

Here are some typical planning conditions that are related to the BS4142:2014 standard:

Example 1. Before the first occupation of the floorspace Class A1/A2/A3/D1 within the development that is hereby allowed the details of any mechanical equipment used in the proposed use, as well as the proposed site for installation as well as an assessment of noise-related impacts must be presented to and accepted in written form from the Local Planning Authority. The report should clearly describe mitigation strategies for the development in order to limit these noise-related impact in acceptable amounts. It should also include

All calculations and baseline data must be presented in a manner it is possible for all calculations and baseline data are clearly laid out so that the Local Planning Authority can fully review the report and critically review the report’s contents and recommendations. The development must be carried out in accordance with the specifics that have been approved.

2. Example 2:”The rate level (LAeq,T) of the fixed equipment and plant related to the development, that are operating at the same time, should not exceed the level of background noise (LA90,T) in any point when measured from the nearest noisy premises. Assessments and measurements of noise must conform to the BS 4142:2014 “Rating industrial noise that affects mixed industrial and residential areas”.

Typically typically, most of the time, Local Authority considers that new developments should enhance and contribute to the locality within which they are situated Therefore, it is the Local Authority will normally define the following criteria:

The development should be planned in a way to reach an acoustic that is 5 decibels (LAeq) lower than the standard level of background (LA90) level in the closest area that is noise sensitive’.

What do you conduct how is a BS4142 noise survey carried out?

The purpose of a BS4142 noise study is to begin by obtaining an estimate of background noise. The second goal is to determine the background noise.

We will conduct an environmental noise measurement in order to determine the background sound level , without the commercial or industrial noise source operating close to the most sound receptor.
A study of the noise emissions coming from industrial noise sources under review is conducted. If the source of noise isn’t yet operational Acoustic modeling will be used to determine the amount of noise emission. If the noise source is operational, noise measurements will take place at the nearest sensitive receptor, with the source of noise in operation.
The degree of noise impact is determined by the standard BS4142:2014. The degree at where the industrial noise is higher than the background noise level will determine the impact likely to occur.
We suggest and evaluate the appropriate mitigation measures to shield the premises that are the closest to sensitive from the ravages of noise.
We will prepare an technical report to submit at the local authorities in order to aid in the preparation of your application for planning.

What will be included in this technical document?

The objective of this report is to provide a concise description local authorities Local Authority the level of noise impacts expected from the proposed plans in accordance with BS4142:2014. It also aims to ensure that proper noise control measures are in place. The report on the noise survey will include the following elements:

A declaration outlining the goal and goals of the report.
A thorough analysis of the development plan
An overview of the area around and the sources of noise that are being evaluated
The method has been used to evaluate the noise level, including the locations of the monitoring and the equipment utilized, information about the calibration process as well as a summary of the weather the date of the survey.
A summary of the findings relevant to the survey. They generally include, LAeq,t LaMax,T, LA90 and the 1/3 octave of LZeq,t.
A review of the noise levels is conducted in accordance with BS4142:2014.
The need for mitigation and recommendations to ensure the safety of the closest noise sensitive buildings, which includes calculation of the expected reduction in noise from noise-control measures.

What suggestions and mitigations are to be expected in your report on noise?

The report will seek to employ any reasonable noise-control measures to ensure that noise impacts are minimized according to the standards of the BS4142:2014. It is always best to control noise at the source, but it isn’t always possible. These mitigations are a possibility:

The specification of low noise equipment
Distance Separation
Acoustic Barriers and Screening
Design and Layout for Buildings
Acoustic Closures
Sound Insulation Schemes
Acoustic Doors and Glazing
Alternative Strategies to Ventilation

What is it that you must do?

Once you’ve had your BS4142 survey of noise completed and you have received the technical report, you must go through the recommendations and make sure any changes to the plan of the project are clearly stated in the layouts of your site, in detail plans and other documents. The report should be presented by the local council to be considered for its approval and must be received in written form.

The responsibility rests with the designer to make sure that all the recommended and mitigation measures are implemented. The quality of workmanship and control will have a major influence on the proper effectiveness of noise control measures, therefore it is crucial to set an excellent standard of work to ensure that the proper implementation of the acoustic detailing that is recommended.