Stopson Italiana wishes you a Merry Christmas and an Happy and Safe New Year

Our 2021: new international projects, expansion of the product range within the marine sector, and a return to a face-to-face trade show.

Innovation and progress have been embedded in our DNA since 1965. In the last months, our departments are still growing in number.

Here below some highlights of our last year:

Back to Trade Shows

  • Enlit is the new unified brand for Clarion Energy’s Global Utility Week and POWERGEN series of events. This year the leading trade show in the POWERGEN sector was held in Milan, our city, and finally in attendance, in compliance with safety regulations. It was a pleasure to present the technological features of our soundproofing products, like Vent Silencers, Intake & Stack Silencers, and many more.


Expanding our offer for the marine industry

  • SilencERmarine is now part of Stopson Italiana’s assets.
    SilencERmarine is a recognized brand in the world of marine equipment and noise control, specializing in the manufacture of soundproofing systems for the luxury sector of the boating and yachting industry.

As 2021 draws to a close, we would like to wish our customers, communities, partners, and other stakeholders a Merry Christmas! We were proud to continue providing reliable, cutting-edge soundproofing solutions to our customers.

Keep following and supporting us, your trust is our strength.

Stopson Italiana exhibits at Enlit Europe 2021

With its know-how within the Power Generation sector and more than 50 years of activity in industrial soundproofing, Stopson Italiana will join Enlit Europe 2021 (Nov 30-Dec 2) in Milan.


What happened to PowerGen Europe?

POWERGEN Europe is now Enlit Europe.

After the first step of a successful co-location of European Utility Week and POWERGEN Europe, we are proud to announce the next step in our journey.
Enlit is the new unifying brand for Clarion Energy’s worldwide series of Utility Week and POWERGEN events. A guiding light for the sector that brings clarity to the global energy transformation and defines the roles of all of those involved.

Meet Stopson Italiana

Stopson Italiana will present the technological features of its soundproofing products, like Vent Silencers, Intake & Stack Silencers, Ventilation & Duct Silencers, Engine Exhaust Silencers, Acoustic Enclosures and many more, in Europe’s leading conference and trade show for the European Power Generation industry.

For all those attending, Stopson Italiana will make available its know-how to support any necessity of developing new soundproofing and noise abatement solutions in the Power Generation Industry following the latest trends guiding the market towards the well-known Energy Transition.

Enlit Europe aims to ignite the spark that will fuel the change we need to give our industry and our planet the brightest possible future.

The central topic of this year is: Accelerate the energy transition.

This year the event plans to offer:

  • An international fair to review the latest industry news;
  • A Summit dedicated to the most strategic issues in which approximately 2000 delegates from the highest corporate offices will take part;
  • Hub Sessions which will offer a more technical content program (accessible to all visitors for free);
  • Initiate! An area that hosts start-ups with their own Start-up program, to promote new and young talents as well as collaboration between universities and research institutes and professionals in the sector;
  • EU Project Zone – A pavilion dedicated to projects financed by the funds of the European Commission, in collaboration with the same.

 Visit us at Enlit Europe, Milan – Booth 16D20 (Italian Pavilion)


Meet us in Milan at Enlit Europe 2021

Stopson Italiana is ready to exhibit at Enlit Europe (f.k.a. Europe Utility Week / PowerGen Europe).


Enlit Europe 2021:

Enlit Europe, the unifying brand for European Utility Week and POWERGEN Europe, is part of the Enlit series of energy events and unlike any other – because they are more than just energy events. Enlit is a community that for 365-days a year will collaborate and innovate to solve the most pressing energy-related issues.
At the European edition, the Enlit community will come together for three days in Milan in October to meet and inspire each other and to develop their discussions and actions into a plan for the coming year. And so the Enlit circle begins: a constantly growing, inclusive, and end-to-end forum that addresses every aspect of Europe’s energy transition.

 Visit us at Enlit Europe, Milan – Booth 16D20 (Italian Pavilion)


Meet us at the event

With over 50 years of experience in developing and manufacturing soundproofing solutions, Stopson Italiana has gained a worldwide reputation for innovation, efficiency, and long-lasting performance.
Our products are the barrier against noise for power plants all across the globe. This experience has given us an unparalleled knowledge of the needs within the power generation industry – from industrial and municipal plants to the largest utility installations.

We look forward to meeting you at Enlit Europe 2021 in Milan.

Enlit Europe will take place in Milan (Italy), 30 November – 2 December 2021, and Stopson Italiana will be exhibiting at Italian Pavilion – Booth 16D20.

Stopson Italiana supplied Multi-Inlet Steam Vent Silencers for Pulp Mill in Brazil

Multi-Inlet Silencers capable to handle flow discharge from 5 steam lines took place within one of the largest ongoing projects in Brazil.

The goal of the project was to ensure the best soundproofing performances at the maximum optimization ratio to fill all 5 steam lines into a single silencer body, while 3 of them discharging simultaneously. Inlet nozzles were placed each one with its specific diffuser and all of them were then conveyed into the upper absorptive section. This allowed Stopson Italiana to guarantee sound absorption while optimizing silencers’ space occupancy.

The solution – recently delivered – includes the supply of No.2 Steam Vent Silencer featuring the following characteristics:

  • Ø 3250 mm x H 4100 mm, noise abatement of 85 dB (A) at 1 m
  • Ø 2000 mm x H 820 mm, noise abatement of 85 dB (A) at 15 m

As an example, the multi-inlet feature allows the biggest silencer for different discharge conditions:

  • Maximum flow rate 32.5 t/hr at 376°C for low pressure (6.5 barg of design pressure) with 8” inlet
  • Maximum flow rate 180.1 t/hr at 420°C for medium pressure (17 barg of design pressure) with 12” inlet
  • Maximum flow rate 262.0 t/hr at 460°C for high pressure (44 barg of design pressure) with 18” inlet
  • Maximum flow rate 270.0 t/hr at 195°C for medium pressure (19 barg of design pressure) with 12” inlet


Our offering for Paper Mill application

Stopson Italiana has a wide range of products for Paper Mill applications, including Air Filtration, Duct Silencer, Acoustic Enclosures and Barriers, Steam Vent Silencers.
Our Vent Silencers are designed to reduce the noise level of exhaust piping to the atmosphere for pressurized gaseous fluids, such as air, vapor, natural gas, nitrogen, oxygen, carbon dioxide, etc. They can be installed downstream any device acting as a link between a container of pressurized gaseous fluid and the atmosphere. The vent silencer can also provide high or low back pressure relief for the system ensuring proper operation.
Vent silencers can be reactive, absorptive or combined type depending on applications and required attenuation, which can reach as much as 75 dB(A).

Typical Applications for vent silencers are:

  • Safety Valve (PSV)
  • Relief valve (PRV)
  • Control valve
  • Ejector
  • Start up valve
  • Snort-valve
  • Flash and Blow Down Tanks
  • Blow-off

Stopson Italiana’s offering for plant Blow-off cleaning does also include additional services and materials as described below:

  • Engineering
  • Steam blow flange
  • Spectacle flanges with gaskets
  • Demi water pumps
  • Gate and globe valves
  • Thermocouples
  • Temperature and Pressure transmitters
  • Pneumatic target plates inserters
  • Installation
  • Blow-off Supervision


See more about our Silencers here.

General implications of noise control in industrial environments

Industrial noise considerations and solutions

Industrial businesses can be a primary cause of noise pollution to the environment, which is why it is important to install acoustic systems into the building. Having appropriate soundproofing solutions within the complex can reduce the loud noises that heavy equipment can emit.


Industrial processes are often very noisy as the operations and equipment to process and produce industrial outcomes often include heavy machinery with limited barriers to restrict equipment noise from carrying beyond the confines of the installations.

The introduction of stringent health, safety, and environmental regulations has led to an increase in importance when considering noise control around industrial processes.

The aim of these regulations is to ensure that a worker’s hearing is protected by preventing them from being subject to high levels of noise which could cause long-term hearing damage.

From an environmental point of view, these regulations have been put in place to keep industrial facilities’ property sound levels below the required noise levels that vary by zoning.

Why do you need industrial soundproofing

There are various reasons as to why you might need to have noise control in your industrial premises. External and internal noise levels need to be kept to an acceptable level, and industrial soundproofing products offer solutions to excessive noise problems for both the environment and workers.

Some plants operate within residential areas, so it’s important to keep external noise to a minimum in order to prevent noise complaints and upset from the local community. Other industrial complexes use loud machinery that goes above the acceptable noise level, this can cause problems internally. Such issues need to be addressed as best as possible, which is why industrial noise control is a necessary asset to have.

Failure to comply with noise mitigation control could see the owner’s fighting legal battles and compensation claims.

Industrial Soundproofing Considerations

There are three basic elements in any noise control system:

  • The source of the sound
  • The path through which the sound travels
  • The receiver of the sound

In many situations, of course, there are several sources of sound, various paths for the sound, and more than one receiver, but the basic principles of noise control would be the same as for the more simple case. The objective of most noise control programs is to reduce the noise at the receiver. This may be accomplished by making modifications to the source, the path, or the receiver, or to any combination of these elements.

The purpose of the noise control procedure may be to prevent hearing loss for personnel, to allow effective face-to-face communication or telephone conversation, or to reduce noise so that neighbors of the facility will not become intensely annoyed with the sound emitted by the plant. The engineering approach is often different in each of these cases.


Noise control solutions

At the source

Modifications at the source of sound are usually considered to be the best solution for a noise control problem either being the most difficult approach. The noise at the source strictly depends on the design process the machinery has been through and in some cases, on its maintenance as well. For example, excessive noise from a roller bearing in a machine may indicate wear failure in one of the rollers in the bearing or, there may be areas, such as panel coverings, that vibrate excessively on a machine.

To determine whether this approach is feasible, the engineers would need in-depth information about the process in which the equipment is taking place and on the machine itself.

On the transmission path

Modifying the path through which the noise is propagated is often used when modification of the noise source is not possible, not practical, or not economically feasible. For noise sources located outdoors or indoors, the transmission path may be modified by placing a wall or barrier between the source and receiver. The use of a barrier will not be effective in noise reduction indoors when the sound transmitted directly from the source to the receiver is much less significant than the sound transmitted indirectly to the receiver through reflections on the room surfaces. In this case, A very effective noise control procedure is to place an acoustic enclosure around the sound source or to arrange the receiver in a soundproofed cabin. The exhaust noise from engines, fans, and turbines is instead controlled by using mufflers or silencers in the exhaust line for the device.

At the receiver

The human ear is the usual ‘‘receiver’’ for noise, and there is a limited amount of modification that can be done for the person’s ear. One possible approach to limit the noise exposure of a worker to industrial noise is to limit the time during which the person is exposed to high noise levels. In other cases, to reduce the sound level to which the workers are exposed, hearing protectors (earplugs or acoustic muffs) can be effective, preventing noise-induced hearing loss in industrial environments.


What are the benefits to apply soundproofing solutions to your industrial facility?

  • Provide a safe work environment by helping to reduce accidents caused by poor communication
  • Prevent hearing loss
  • Increase productivity by decreasing distractions
  • Reduce complaints from neighboring businesses and residents

Soundproofing comes in many forms and does a great deal of work to create an environment conducive to productivity, effective communication, and privacy. No matter the industry, taking the time to factor the sonic landscape of a property into your plans will pay dividends in the future.

Industrial plants are often complex facilities, requiring individualized noise control solutions. For every reason why you would need to solve for each of the many different types of industrial noise, there exists a solution. As such, it’s important to consult experts in the field of industrial acoustics to solve for each individually.

Stopson Italiana has worked nationally and internationally for 50+ years with plant processing engineers and their consulting teams to provide accurate and cost-efficient, site-wide noise assessments and mitigation solutions for industrial sectors across many industries.




Engineering Noise reduction for Hydroelectric power plant

Steps that can be taken to help mitigate excessive noise in the hydroelectricity industries

Since the amount of machinery, such as turbines, air compressors, and rotors associated with each generating unit, noise production in Hydroelectric power plants is high.


The human body has few resources to defend itself from noise. This alteration can create many effects on the human organism including contemporary stress that changes working behavior, produces low productivity, high rates of absences from work and obviously hearing loss.

Hydroelectric Power Plants generate lots of power and sometimes excessive noise. Among hydropower plants, there are some built more than half a century ago, and the noise was not factored into plant design. To confirm that, most power plants have hard concrete walls that magnify sound. What happens is that energy doesn’t go anywhere, it just bounces off the walls. And that tends to increase the noise levels even way above the source.

To capture the noise profile and target even the subtlest reverberations, Soundproofing experts must perform acoustic surveys using cutting-edge analytical equipment to isolate hazardous noise sources.


“In marine vessels and submarines stationed across the globe, noise suppression technologies have been successfully used in engine rooms since the 1970s. They’ve put a lot of effort into making sure that a marine vessel is very quiet, so their engine rooms are really similar to a hydropower plant, with thick walls, and water all around. There may be a connection, relationship there and sure enough, it was. So, choosing a partner with strong expertise in the marine sector will help to solve noise concerns in these peculiar power plants.” LEARN MORE

Soundproofing Hydroelectric Plant

To mitigate noise, soundproofing experts must analyze and design solutions for treating the noise at the source (if possible), but, due to plant complexity, frequently the plan involves treating the transmission path to the receiver.

While designing soundproofing solutions, maintenance considerations must be taken into account in suggesting noise control techniques for hydroelectric power plants. Materials and methods need to be as maintenance-free as possible and still able to achieve the desired noise reduction level. Used materials also need to meet safety regulations for fire, smoke, and toxicity.

Here are some examples of soundproofing solutions for Hydroelectric stations:

  • Damping

Damping is a term used to describe applying a viscoelastic material to a structure to reduce the vibration of that structure. Since noise (acoustical energy) can be generated by a structure that vibrates and is an efficient radiator, reducing the surface velocity due to damping will also reduce noise.

  • Sound Absorption

Silencers are the most well-known example for absorbing energy to reduce noise. By adjusting the specifications of the silencers, acoustical energy at certain frequencies will be “trapped” within the silencer body and will dissipate.

  • Acoustic Barriers

The concept behind an acoustic barrier is simple. By placing a solid wall (barrier) between the sound source and the receiver, the acoustical energy gets reflected back to the source and will not reach the receiver, thus reducing overall noise. Acoustic enclosures and barriers are ideal for spaces where frequent access is required, yet a significant reduction in the transmission of acoustical energy is desired, such as a turbine pit.


Included in the supply are the previous surveys, the design, the construction, the installation, and the photometric measurements of an acoustic booth…(READ MORE)


Because of the variety of contributing noise sources in Hydroelectric plants, there is no one-size-fits-all solution. Due to the complexity of the acoustical challenges this sector faces, a tailored solution is required to ensure the deployment of effective noise control systems.

Following an initial consultation path with a leading industrial and environmental noise control manufacturer, is the quickest and most effective way to solve complex noise mitigation challenges.

Stopson Italiana has worked internationally with plant processing engineers and their consulting teams to provide accurate and cost-efficient, site-wide noise assessments and mitigation solutions of industrial sectors such as petrochemical complexes both large and small.


Stopson Italiana Acoustic Enclosures delivered to Trigeneration plant in Dovera, Northern Italy

No. 3 Acoustic Enclosures to soundproof trigeneration plant

Trigeneration plant – Dovera: The new combined electricity and thermal power generation plant, consisting mainly of a 1,200 kW internal combustion engine, a recovery boiler, and a lithium bromide absorber for the generation of chilled water. This package will ensure a more efficient and competitive operation, allowing a reduction of energy costs and a lower environmental impact.

The electricity generated and the thermal energy. will be fully used by the production site, with significant savings both economically and in terms of greenhouse gas emissions into the atmosphere. This plant will allow a reduction in CO2 emissions into the atmosphere by about 14.5%, compared to separate production. The importance of meeting environmental requirements is well known to management, who decided to partner with Stopson Italiana for soundproofing the plant.

The new plant is among the most modern available today, and it needed to be paired with custom soundproofing products to keep up performance and ensure noise reduction.

The project – which has been recently completed – includes the supply of N°3 Acoustic Enclosures featuring the following characteristics:

  • N° 1 Load-bearing Monobloc Enclosure for Cogenerator:
    Dimensions: Width mm 3.000 – Length mm 14.200 – Height mm 3.000
  • N° 1 Load-bearing Monobloc Enclosure for Transformer
    Dimensions: Width mm 3.000 – Length mm 3.150 – Height mm 3.000
  • N° 1 Removable Enclosure for Absorber
    Dimensions: Width mm 4.500 – Length mm 11.400 – Height mm 3.500


In addition to having soundproofing characteristics, the sound-absorbing material provides the structure with properties of incombustibility and inalterability. The structure was designed by a team of structural engineers to withstand different weight levels and any seismic risks too.

The soundproof cabin guarantees a residual average sound pressure level in the free field of 65 dB(A), measured at 10 meters from the cabin.

Stopson Italiana Solutions – Acoustic Enclosures


Stopson Italiana has been present for decades in the world market of soundproofing as one of the leading producers of acoustic enclosure and control cabins.

The soundproofing solutions reduce noise pollution due to various sources, including the main turbines, auxiliary engines, internal combustion engines and generating sets, mobile power generators (mounted on trailers) for the production of electricity, cogeneration plants, natural gas compression units, starting and vacuum pumps, blowers, fans, mills, presses, vibrating devices, power transformers, and boilers.

Stopson Italiana’s Acoustic Enclosures feature:

  • Noise reduction from 15dB(A) to 65dB(A) +
  • Vibration dampers, anti-shock systems with sound emission control settings
  • Combustion air intake unit with optional air filtration
  • Removal of exhaust gases from combustion engines
  • Internal / external applications
  • Natural, induced or forced ventilation system
  • Integrated lighting, fire protection systems, air conditioning
  • Modular solutions
  • Easy access for operation and maintenance with removable panels or sliding hoods
  • Installation service

⟶ For More Information about Enclosures click HERE 

Industrial Soundproofing for Marine Engines

Marine noise considerations and solutions

Safety first, safety always. The primary purpose of installing industrial sound proofers in marine engines is to ensure minimal exposure of people (personnel to noise hazards).

By effectively applying sound proofers to marine engines, chronic hazards like partial deafness, tinnitus, threshold shift in hearing, and noise-induced hearing loss can be effectively avoided.

The maritime industry bears certain similarities to the aviation industry regarding compliance with full safety regulations by local and international regulatory bodies. This may be attributed to the high risks involved and the nature of their operations.
Special noise safety laws and regulations have been provided and reviewed as deemed fit within the industry over the past couple of years. Expectedly, strict implementation of these laws is expected from the employers and employees in the maritime business. This implies that compliance with these regulatory standards is a moral responsibility for all shareholders.

Industrial soundproofing of marine engines is one of the many recommendations by noise hazard safety experts adopted into the maritime standards and policies. Marine engines generate excessive noise above the acceptable limit of sound (< 85 decibels). It has necessitated the design of marine engines with soundproofs and the need for alterations to allow for the installation of soundproofs in marine engines originally lacking soundproofing.

Sounds and an excess of it (noise) results primarily from the amphibious engines and secondarily from engines in onboard mechanical or electro-mechanical systems. Both noises are undesired and require the development of methodologies to mitigate them.

How to Mitigate Yacht Sound Pollution with Soundproofing

Experts of noise management and several organizations have developed and mastered containing noise from yacht engines. Some of the most effective noise management techniques are:

  1. Usage of soundproofing barriers:

An adhesive-like material that can easily be fitted like a chewed gum is placed on a body of a plastic pipe. These soundproofing barriers are installed inside the yacht cabins and engine rooms to mitigate the resulting noises.

  1. Use of noise isolation systems:

Noise isolation systems are technological products designed to mitigate potentially harmful noises produced within an area drastically. These devices are strategically positioned and are more effective with an area to a number of device ratio.

  1. Sound Dampening Materials:

Since vibrations from moving parts of marine engines are a major notorious mechanical phenomenon that produces noise, experts use sound dampening materials to lag engine parts, sittings of these engines, nuts, and screw meet points.

  1. Anti-drumming mats:

Excessive noise and vibrations from yacht occupants and engines are managed by using anti-drumming mats made by heavy acoustic foil. These specially made mats are placed at doorways to help curb excessive noise pollution.

  1. Fabrication:

An age-long system of noise control for marine engines is an engineering control that involves the design, fabrication, and installation of a sound-proof cage-like structure around the engine (primarily) and sound-proofing walls of the yacht engine room.

  1. Complete Soundproofed Exhaust system:

Dry and Wet custom exhaust systems are probably the most effective way to soundproof marine engines. Made from Stainless Steel or GRP (Glass Reinforced Polymer).

The difference between Dry and Wet exhaust system

  • Dry Exhaust:

Compare a dry exhaust to the exhaust pipe of the car: a pipe with a flexible connecting piece on the exhaust manifold, discharging the exhaust gases directly to the outside air. A dry muffler is often required to muffle the noise. Cooling water from the engine is added to the exhaust system either externally or at a much later stage. The tubes and pipes are often made of steel to prevent them from melting due to the high temperature. It is a simple system, but with two major drawbacks: it emits intense heat of up to 600°C at the source, and it produces more noise.

  • Wet Exhaust:

It is recognizable by the manifold that is mounted on the engine. This is often custom-made from GRP (Glass Reinforced Polymer). The heated cooling water in the engine is around 60-90°C when it leaves the engine, so it can be perfectly used to cool the 600°C exhaust gases. Water and gases are often not yet mixed in the first section of the exhaust pipe. That is to prevent the water from entering and blocking the gases from exiting the engine. Gases must be able to exit the engine smoothly so as not to compromise the engine performance. At a short distance from the engine, the gases and liquids come together and exit the engine.

To find your best-fitting complete exhaust system to soundproof your engine you might want to take advantage of the experienced industry-leading company SilencERmarine.

SilencERmarine develops, manufactures, and market throughout the world stainless steel and GRP (Glass Reinforced Polymer) silencers, complete exhaust systems (R.I.Na. – Italian Naval Registry, D.N.V., and Lloyd’s Register approved as well as any other approvals required), and all components and accessories needed to install these.

Benefits of Soundproofing

It is important to note that failure to effectively soundproof onboard engines can rack up serious consequences. Some of these consequences may include the deteriorating health of the crew, who are often the first victims of sound pollution to occupational hazards due to longer exposure to noise emanating from onboard engines.

The resultant effect may see yacht owners paying litigation and compensation fees. In addition, non-compliance to regulatory noise limit aboard could incur strict penalties and fines from respective authorities.

The benefits of soundproofing a typical yacht outweighs putting up with the noise encountered during sails. Some of these advantages are:

  1. Improved reputation for yacht owners which is good for business.
  2. Increased ROI by implementing reliable soundproof materials such as Steel dry silencers.
  3. Compliance with regulatory standards thanks to top-tier industry GRP silencers and separators.
  4. Easy detection of mechanical or operational anomalies due to the absence of noise.

Methodologies and Materials to Mitigate Noise in Onboard Engines

The application of these soundproof materials is largely dependent on the design and location of the yacht engine. Since onboard engines could be integrated inside or in the outer parts of the yacht, the preferred application of soundproof materials varies. IMO (International Maritime Organization), the custodian of the Safety At Sea (SAS) internationally, does not compromise its stance regarding maritime safety. For more specificity, noise control is not given less attention.

Sanctions are often meted on violators in a bid to ensure reduced safety challenges on the seas. To avoid such sanctions and penalties from regulatory bodies such as IMO, simply ensure to install sound proofers around marine engine parts and even the yacht’s cabins. If you need expert advice on your soundproofing needs, you can contact

Ultimately, maritime investors, yacht owners, captains, staff crew, visitor crew, and other stakeholders are expected to report cases of noise pollution to relevant authorities as this may be injurious to the health and well-being of the occupants. The health and safety of those on board should be considered as primary and most important. Industrial soundproofing for marine engines is fundamental and should be encouraged internationally and otherwise.

National policymakers should consider creating regulations that border around efficient soundproofing practices.

Turbines and Noise Control

Gas and Steam Turbines noise considerations and solutions

Electrical power consumption has increased rapidly in the past years and consequently, the need for many large power plants has increased. A form of power generation that has emerged is the gas turbine, which has a wide range of applications such as pipeline transmissions of fuels (gas compressors and liquid pumpers), process power plants, peak load electrical power generation, and more recently baseload electrical power generation utilizing a combined cycle of steam and gas. Parallel to this rapid industrial growth and in reaction against it, concern for the protection of the environment has grown, manifesting itself through the issuance of ordinances and recommendations on local, national, and international levels.

Turbines generated noise types

In a standard modular unit, there are various noise sources, here classified into 5 groups according to the location where they are generated: Aerodynamic, Magnetic, Mechanical, Combustion, and Hydraulic:


The origin of this noise is the direct excitation of the air or gas by a flowing medium or the interaction of the flow with fixed or movable obstacles within the turbines themselves. This type of noise usually comes from:

  • Flange-to-Flange
  • Vent
  • Gas Valves

Although these noises do not always constitute a major source in the overall noise generated by a power station, their presence is not tolerated because of the pure tone at 100 Hz of their sound power. These noises result from alternating magnetic forces due to electrical current and involve in general the generator and the transformer.


The mechanical noise that does occur results from a slight unbalance bearing friction, rotational impulses, and torque transmission, in the case of load gear. However, due to the quality of the rotating components and the precision manufacturing required for gas turbines, low sound emissions are generated.
The average low vibration levels measured at the installations underscore the general manufacturing quality of this equipment.


Combustion noises, rich in low frequencies, depending on different turbine’s assets: the quantity of the heat released, the geometry of the flame, the nature of the fuel, and the type of fuel nozzle used.


The generation mechanism of this type of noise is the same as for aerodynamic noises with the additional problem of possible cavitation. The high-pressure fuel pump and the flow divider constitute point power sources close to 110 dBA. At some representative complexes, it was observed that their noise was conducted along with the fuel piping, which acted as a line source.


The large number and variety of noise sources force plant operators to face hard challenges when trying to find a comprehensive solution for noise coming from gas (or steam) turbines.

Soundproofing your Turbine

The easiest solution would be to wrap the equipment with an acoustic enclosure and solve the problem right at the source. It might not be as easy as it sounds, acoustic enclosures are not standard products and are often customized on clients/equipment needs. Not just that, noise control plans are inclined to be comprehensive for the operation complex as a whole and not just for the turbine itself.

Due to the vast amount of noise sources within the turbine and the variety of noise types that they spring, the most cost-effective approach is a comprehensive noise program, to take place with a specialized partner able to provide custom and complete soundproofing solutions.

Selecting a trustable partner that is specialized in specific products in the field of power plant noise reduction is the ideal answer to the challenges you are facing. Approaching the consultation path with a leading industrial and environmental noise control manufacturer is the quickest and most effective way to solve complex noise mitigation challenges.

Stopson Italiana has worked nationally and internationally for 50+ years with plant processing engineers and their consulting teams to provide accurate and cost-efficient, site-wide noise assessments and mitigation solutions for industrial sectors such as Power Generation plants.





Stopson Italiana solutions


Stopson Italiana represents an A-Z solution to control noise in Power plants. Innovative engineering and design solutions deal with practical challenges when implementing our soundproofing systems.

Working on-site with HSE, Operation, and Plant Managers, we believe that effective noise control is a cooperative process between Stopson Italiana and our clients. From initial assessment and noise sources identification to the final result, we provide tailor-made noise control solutions that fulfill the needs of our customers and their industries.


⟶ For More Information about Stopson Italiana soundproofing offer click HERE 

Stopson Italiana Vent Silencers to soundproof OMSK Oil refinery plant in Russia

No. 3 Vent Silencers supplied to one of Russia’s most modern refineries.

OMSK Refinery – Russia: With an installed capacity of 22.23 million tonnes of oil per year, the Omsk Refinery processed 21 million tonnes in 2018, maintaining its leading position in Russia by refining volumes. The Omsk Refinery also leads the industry in terms of key performance indicators in production efficiency, with its light product yield reaching 71.04 percent in 2019, and refining depth 90.89 percent.

The Omsk refinery in Russia has been undergoing full-scale modernization since 2008 including an upgrade to producing fuels meeting Euro 5 standard in phase one of the modernization program that was completed in 2015. Scheduled for deployment within 2021, the phase two project is aimed at increasing the refining depth to 97% and boosting the light petroleum products yield to 80%.

The various technological processes used at the Omsk Refinery are among the most advanced available in refining today, and they needed to be paired with the best soundproofing products to keep performance and ensure noise reduction.


The project – which has been recently delivered – includes the supply of N°3 Vent Silencers featuring the following characteristics:

  • 1 V.S. – 750 kg, Flow rate 12 t/h, Temp. up to 538 °C
  • 2 V.S. – 2375 kg, Flow rates 30,9 t/h, Temp. up to 300 °C

Vent silencers are capable to achieve a global noise attenuation up to 70 dB, depending on the

cases, with a target result of 76 and 78 dB(A) @ 1 meter from the equipment.

Welding processes and qualifications as well as all materials involved are certified for low-temperature environmental conditions in order to withstand a minimum design temperature equal to -37°C for pressure parts and -42°C for atmospheric components.

Moreover, due to the rigid climate with a minimum ambient temperature of -49°C, all silencers are equipped with an Anti-freezing Steam System that increased the complexity of the design due to various flange connections to accommodate the coils system on a limited surface along with all required accessories for external insulation, lifting and supporting systems.

Stopson Italiana Vent Silencers

Stopson Italiana has a wide range of products for Refinery applications, including Air Filtration, Duct Silencers, Acoustic Enclosures and Barriers, In-Line Silencers, and Steam Vent Silencers.

Our Vent Silencers are designed to reduce the noise level of exhaust piping to the atmosphere for pressurized gaseous fluids, such as air, vapor, natural gas, nitrogen, oxygen, carbon dioxide, etc. They can be installed downstream of any device acting as a link between a container of pressurized gaseous fluid and the atmosphere. The vent silencer can also provide high or low back pressure relief for the system ensuring proper operation.

Vent silencers can be reactive, absorptive, or combined type depending on applications and required attenuation, which can reach as much as 75 dB(A).

Typical Applications for Vent Silencers are:

  • Safety Valve (PSV)
  • Relief valve (PRV)
  • Control valve
  • Ejector
  • Startup valve
  • Snort-valve
  • Flash and Blowdown Tanks
  • Blow-off

⟶ For More Information about Stopson Italiana Silencers click HERE