stopson blow-off silencers rental

Blow-off Rental Service now available at Stopson Italiana

How to solve temporary noise reduction needs linked to Blow-off Operations

Nearly any high-pressure gas or steam application has the need to purge or evacuate a system at certain times or as a safety measure. When releasing high-pressure gases into the atmosphere, a large amount of kinetic energy is freed due to the pressure difference. The pressure difference causes a dramatic increase in velocity which results in high sound emissions which need to be reduced.

Stopson Italiana Blow-off Silencers are specifically designed to reduce the noise generated by the high differential pressure at the time of a release. The engineering and calculation processes require the following data: medium, mass flow, pressure, and temperature upstream of the valve. The acoustic design covers two main steps: the determination of the non-silenced sound power level and the calculation of the silencer itself.

The sound power level can be transmitted by the valve supplier or inferred by Stopson Italiana using a proprietary framework developed on international standards, and honed by Stopson Italiana’s scientists.

What is a Blow-Off Silencer

The Blow-Off type is a typical expansion and absorption silencer, which is used before the system’s enactment. The principal use is to clean the pipes, removing any solid bodies and residual debris after erection and installation. The expander has a horizontal configuration, located laterally to the body of the silencer, is built with higher thicknesses and usually three metal layers (Case Study: Stopson Italiana’s Blow-off installation in a reconverted paper mill in Italy here).

Soundproofing temporary installations

Profiting from almost sixty years of experience, Stopson Italiana has developed the most efficient silencers with the longest design life. For temporary installations – like steam purging of pipes before plant start-up or boiler/pipe system maintenance – suitable blow-off silencers for rent are now available.

Stopson Italiana’s Blow-Off Silencers cover a wide range of flow rates, pressures, and most common acoustical guarantee targets:

  • 20 t/h up to 250 t/h flow capacity
  • 4 bar to 8 bar Inlet pressure
  • 100 dB(A) @ 1m residual SPL or
    95 dB(A) @ 10 m or
    85 dB(A) @ 30 m

In addition, they are designed to withstand typical blow-off temperatures and feature the following characteristics:

  • Corten A body and structure for a longer resistance at high temperature
  • AISI304 diffuser for clean fluid operations
  • 12”/20” inlet connections with customized adapters available upon request
  • T-joint to avoid larger debris flowing into the diffuser
  • Supporting legs 1.5 meters high from the ground

Stopson Italiana Blow-Off silencers are currently available in three models to cover the entire range of flow rates:

  • SPM 20-70/B: 20-70 t/h capacity range, from 1.2 bar inlet pressure
  • SPM 70-120/B: 70-120 t/h capacity range, from 5 bar inlet pressure
  • SPM 120-250/B: 120-250 t/h capacity range, from 8 bar inlet pressure

Blow-Off silencers can be also tailor-made for Sales against project and Customer specifications with flow rates up to 900 t/h. Stopson Italiana offers an important contribution to the early design process to optimize the system of valves, pipes, and silencers with regard to sizes and costs.


To support plant blow-off operations Stopson Italiana provides a wide range of additional equipment and services:

Engineering Services:

  • Hydraulic Engineering
  • Instruction and Procedures
  • Temporary Piping and Support Design
  • Final Report

Equipment – Sales and Rental Services:

  • Blow off silencers
  • Manual/Pneumatic Target Plate Holder
  • Target Plates
  • Valves
  • Pumps
  • Accessories

On-site Services:

  • Supervision
  • Consulting Services
  • Engineering
  • Representation

Stopson Italiana’s extensive knowledge and experience providing A-Z soundproofing solutions to industrial facilities since 1965, ensure the supply of comprehensive acoustical solutions in support of meeting customer mandatory requirements and their soundproofing objectives, being temporary or permanent.



stopson news soundproofingoil and gas

Soundproofing Solutions for Oil and Gas Industry

Tackling noise-related problems in the Oil and Gas industry


Oil and gas acquisition, refinement, and distribution require the work of several complicated machine networks, some of which produce significant harmful noise. Not only do high decibel levels impact nearby neighbors, but prolonged exposure hurts workers who operate close to the noise sources. This exposure leads to unnecessary long-term health effects that degrade workers’ quality of life. While restricting your hours of operation for noisy blowdowns makes life easier for neighbors, you need further measures to protect your workers.


Noise intensity is measured in decibel units (dBA). The dBA scale is logarithmic; each 10-dBA increase represents a tenfold increase in noise intensity. Human perception of loudness also conforms to a logarithmic scale; a 10-dBA increase is perceived as roughly a doubling of loudness.

Thus, 30 dBA is 10x more intense than 20 dBA and sounds twice as loud; 40 dBA is 100x more intense than 20 and sounds 4 times as loud; 80 dBA is 1 million times more intense than 20 and sounds 64 times as loud.

Distance from the source and duration of the exposure are also to take into account.

In general, we can say that, subjected to 45 dBA of noise, people cannot sleep. At 120 dBA the ear registers pain, but hearing damage begins at a much lower level, about 85 dBA.


​​With oil and gas operations producing so much noise, any noise control products have to be customized to each worksite to have their maximum effect.

Due to the various compressors, pumps, furnaces, blowers, extractors, and other equipment placed on this kind of complex, it comes as no surprise that the possible solutions are different according to what the project is trying to accomplish.

Here are some examples of soundproofing products:

  • Acoustic Cabins and Enclosures

Acoustic Enclosures are available for generator sets, pump sets, compressors, and other machines and installations, while Cabins are usually more suited for mud pump rooms, engine rooms, or complete driller cabins. Both can be designed for customers’ particular requirements so that it is a perfect fit for their plant.

  • Ventilation sets, silencers and acoustic louvres

A ventilation set includes an air inlet and air outlet system for the ventilation of heat radiation, air inlets for combustion air, and eventually a purge system. Possibly including Silencers, acoustic louvers, heat tracing, demister panels, filtration systems, dampers, anti-condensation heaters, and redundancy.

Stopson Italiana available silencers:

  1. Vent Silencers
  2. Engine Exhaust Silencers
  3. Intake & Stack Silencers
  4. Ventilation & Duct Silencers
  5. In-line Silencers
  • Sound insulating doors

Soundproofing doors with high sound insulation values and possibly fire resistance properties. With a clean design and fully customizable, they are therefore very appropriate to place anywhere where noise insulation is essential.


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 like the ones faced by Oil and Gas professionals.

Stopson Italiana’s extensive knowledge and experience providing turnkey industrial noise control solutions to the Oil and Gas industry since 1965, ensure the supply of comprehensive acoustical solutions in support of meeting customer mandatory requirements and their soundproofing objectives.


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.


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 

Stopson Italiana supplied In-Line Silencer for Gas Compression Station in Denmark

No. 2 In-Line Silencers took their place along the Compression pipeline to provide a noise reduction up to 25 dB.

Gas Compression Station – Egtved: The natural gas plant consists of four compressor units and service buildings, supplying the central intersection of the gas pipelines connection north-south from Germany and east-west to Sweden.

The goal of the project was to ensure the best soundproofing performances while maintaining the maximum flow rate within the pipeline. After intense testing, Stopson Italiana developed silencers with special materials suitable for sound absorbing in a pressurized environment. In order to allow higher velocities than standard sound-absorbing material compared to actual flow density, these materials are not directly exposed to the flow, thus maintaining higher initial acoustic performance.

The solution – recently installed – includes the supply of 12” and 16” In-Line Silencers featuring the following characteristics:

  • 82.5 barg design pressure
  • -28° minimum design temperature
  • 22 mm shell thickness
  • In-shop hydro-tested at 123.75 barg
  • PED category IV module G certification

In addition to the above, the acoustic guarantee for supplied silencers is 25 dB(A) of sound power in a fluid vein!

Our offering for Pipelines

Silencer typology: In-Line Silencer

In-Line Silencers are pressurized silencers aiming to reduce the noise generated by valves or compressors.

Being a piece of exclusive design and manufacturing, in-line silencers require deep engineering knowledge, field experience, and accurate quality processes to deliver high-performing and safe products.

The peculiarity of the chosen solution is that noise attenuation is achieved by means of a reactive component only, without the use of an absorbing section.

Stopson Italiana provides for all the silencers the contractual acoustic guarantee of sound energy in a fluid vein resulting in an approx 30 dB attenuation!


Features of Stopson Italiana In-line Silencers are:

  • Small, compact construction and high acoustic performance
  • High flow velocity
  • Available in most used pipe diameters and pressure ranges
  • Wide application range
  • High structure-borne attenuation along with the silencer


⟶ For More Information about Stopson Italiana Silencers click HERE 

SilencERmarine is now a Stopson Italiana brand

Stopson Italiana based in Milan (Italy),

leader in industrial soundproofing systems, has recently acquired the brand SilencERmarine, with the aim of increasing its offering in the market of noise control for marine equipment.

SilencERrmarine products and services’ addition to its current portfolio will allow to further strengthen Stopson Italiana’s presence on the naval/marine market with interesting growth prospects, ready to accept the challenges of the competitive global market.

SilencERmarine is a well-recognized brand in the world of marine equipment and noise control, specialized in the production of soundproofing systems for the luxury sector of the boating/yachting industry.

SilencERmarine proven know-how covers the development, manufacturing, and turn-key installation of the following:

  • 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),
  • All components and accessories required to supplement installations of the above products

Here at Stopson Italiana, we believe the experience and knowledge in noise attenuation of marine/naval equipment from SilenceERmarine, combined with the strong and global sales network of Stopson Italiana, can increasingly sustain the growth of the Company.

For 50+ years Stopson Italiana has been offering advanced technological solutions for the leading players in fields such as Oil & Gas, Power Generation, and Industrial sectors, guaranteeing high-efficiency performance in terms of a significant reduction of noise and optimization of operating performance at customers’ facilities.


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Stopson Italiana In-Line Silencers installed in the new Trans Adriatic Pipeline

Stopson Italiana’s solutions chosen to soundproof the new Trans Adriatic Pipeline (TAP). 10 silencers take their place in crucial points along the pipeline to provide a noise reduction up to 30 dB.

TAP is a pipeline project to transport natural gas, starting from Greece via Albania and the Adriatic Sea to Italy and further to Western Europe.

The pipeline would be supplied by natural gas from the second stage of the Shah Deniz (Azerbaijan) gas field development in the Azerbaijani section of the Caspian Sea through the South Caucasus Pipeline and the Trans Anatolian Pipeline (TANAP). The project is aimed at enhancing the security of supply as well as diversification of gas supplies for the European markets. TAP will open a new so-called Southern Gas Corridor to Europe and market outlet for natural gas from the Caspian Sea and Middle East regions and is designed to expand transportation capacity from 10 to 20 BCM per year depending on the stage of the Project.

Stopson Italiana is taking part in the project with its soundproofing solutions. Due to the large scale of the project, the 10 silencers will be installed in specific and crucial points along the pipeline.

  • Nr 3 Silencers – Trans Adriatic Pipeline Receiving Terminal – Melendugno, Italy
  • Nr 3 Silencers – Trans Adriatic Pipeline Compressor Station – Kipoi, Greece
  • Nr 3 Silencers – Trans Adriatic Pipeline Compressor Station – Fier, Albania
  • Nr 1 Silencer – Trans Adriatic Pipeline Metering Station – Bilisht, Albania

Our offering for Pipelines

Silencer typology: In-Line Silencer

In-Line Silencers are pressurized silencers aiming to reduce the noise generated by valves or compressors.

Being a piece of exclusive design and manufacturing, in-line silencers require deep engineering knowledge, field experience, and accurate quality processes to deliver high performing and safe products.

The peculiarity of the chosen solution is that noise attenuation is achieved by means of a reactive component only, without the use of an absorbing section.

Stopson Italiana provides for all the silencers the contractual acoustic guarantee of sound energy in a fluid vein resulting in an approx 30 dB attenuation!


Features of Stopson Italiana In-line Silencers are:

  • Small, compact construction and high acoustic performance
  • High flow velocity
  • Available in most used pipe diameters and pressure ranges
  • Wide application range
  • High structure-borne attenuation along with the silencer

Stopson Italiana In-Line Silencers are used to control noise produced by valves in piping systems. The In-Line silencer reduces the aerodynamic noise resulting from gas or vapor turbulence. The In-Line silencers are not the only soundproofing solution Stopson Italiana has in its arsenal.

Silencers in a circular or rectangular shape, atmospheric or pressurized for any gas, temperature range, and applications providing sound attenuation up to 70 dB and reduce residual noise to a sustainable level.


⟶ For More Information about Stopson Italiana Silencers click HERE