Allegro Acoustics delivers industrial noise control for factories, power stations, pharmaceutical plants and manufacturing sites across Ireland and the UK. We assess the problem, monitor to quantify it, model to find the source that is actually driving it, then design and install the noise reduction needed. From IEL compliance and workplace noise reduction to community noise complaints, the work runs from first measurement through to verified performance.
Industrial noise control is the engineering work of finding out which plant is actually driving a noise problem, then designing, supplying and installing the enclosure, barrier, silencer or damping treatment that fixes it. Allegro Acoustics delivers industrial noise control across Ireland and the UK on live sites, from first measurement through to verified performance.
From IEL compliance and workplace noise reduction to community noise complaints, our experienced engineers provide a turnkey service from assessment and modelling through to design, installation support and verification. Our practical solutions and extensive live-site experience help clients resolve noise issues quickly and with minimal disruption.
Before anything is designed, the problem has to be understood properly. We carry out industrial noise assessments to establish where the noise is coming from, how much each source contributes and what the site is being measured against, whether that is an Industrial Emissions Licence limit, a planning condition or an occupational exposure duty.
Sound power measurement of individual plant is the part most often skipped, and it is the part that saves money. Treating every item of plant as equally responsible leads to over engineering. Establishing that two fans account for most of the exceedance means the mitigation can be targeted at two fans.
Once every source has a measured sound power level, acoustic modelling puts them into a three dimensional model of the site and shows what each one contributes at the boundary and at the nearest homes. Mitigation options can then be tested in the model, at no cost, until the cheapest combination that reaches the limit is found. This is the step that separates a proportionate scheme from an expensive one, because it is the only way to know in advance that treating three sources will be enough and treating eleven is unnecessary. Our guide to noise modelling and noise mapping covers how the models are built and validated.
We provide industrial noise monitoring on an ongoing basis for licensed sites, including annual compliance surveys, boundary monitoring at the site perimeter and long term unattended monitoring where a condition requires it. Where a complaint has been made, monitoring is designed to capture the conditions being complained about rather than a convenient daytime average.
Reducing noise on a working site is an engineering problem constrained by access, process continuity and safety. Our engineers have delivered noise control inside live power stations and operating pharmaceutical plants, where the process cannot simply be switched off for the works. That experience shapes the design as much as the acoustics do.
Typical measures include acoustic enclosures, barriers, in duct and discharge silencers, lagging and damping treatments. Where a solution is specified we can supply and install it, then verify by measurement that it has achieved what was predicted.
Being able to supply and install as well as specify is the part that matters most to a site manager. An industrial noise consultant who stops at the report leaves the client to procure against a specification they cannot evaluate, and the gap between what was specified and what was installed is where most disappointing outcomes come from. We carry the design through to a commissioned, measured result. Our guides to acoustic enclosures and industrial soundproofing set out how the main measures work and where each one is appropriate.
Factory noise control usually has two drivers running at once, the licence limit at the boundary and the exposure limit on the floor. They are not the same problem and the cheapest solution to one is not always any help with the other, but a single measurement campaign can serve both if it is planned that way. Where the exposure duty is the pressing issue, our workplace noise assessment service covers the occupational side in full.
Where the issue is noise leaving the site rather than noise within it, the assessment is against boundary and noise sensitive receptor limits. We model the propagation, identify which sources are audible at the receptor, and design the control needed to bring levels within the applicable limit. Complaint driven work is handled discreetly and with an eye on the regulatory relationship as well as the technical fix.
Noise pollution complaints rarely turn on the overall level alone. A tonal hum from a fan, an intermittent blowdown or a reversing alarm at night will generate complaints at levels that a broadband measurement would call compliant, which is why character assessment under EPA NG4 and BS 4142 is part of the work rather than an optional extra. Establishing the site contribution against the prevailing background usually needs environmental noise monitoring at the boundary and at the receptor at the same time.
Our engineers have delivered industrial noise control inside operating power stations including Whitegate, Tynagh and Turlough Hill, in pharmaceutical and medical device manufacturing at Eli Lilly in Kinsale and Boston Scientific in Cork, and in food, drink and industrial processing at Diageo St. James’s Gate and Lufthansa Turbine Technik in Shannon.
By measuring the sound power of individual items and modelling their contribution at the boundary and at the nearest homes. That is the step most often skipped, and skipping it leads to over engineering. Establishing that two fans account for most of an exceedance means the mitigation can be aimed at two fans.
Usually, and it is most of what we do. Our engineers have delivered noise control inside operating power stations and pharmaceutical plants where the process cannot simply be switched off. Access, process continuity and safety constrain the design as much as the acoustics do, and planning for that is part of the work.
Acoustic enclosures, barriers, in duct and discharge silencers, lagging and damping treatments, chosen against the source and the constraints of the site. Where a solution is specified we can supply and install it as well, which closes the gap between what was specified and what actually gets built.
By measuring after installation against the same method used before it, and comparing the result with what the model predicted. Commissioning verification is part of the service rather than an extra, because a prediction is only a prediction until it has been demonstrated on site.
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