Types of industrial silencers and how to choose the right one

Noise-induced effects pose significant concerns for individuals employed in the industrial sector and not only.

Numerous manufacturing facilities look to adopt industrial silencers with a view to mitigate risks through acoustic attenuation. The final goal is to safeguard the surrounding from the harmful consequences of loud machinery and noisy production areas. 

Industrial silencers find application in managing noise levels associated with diverse industrial processes. However, the selection of a silencer that fits perfectly your needs is anything but an easy task.

Silencer manufacturers may offer many possibilities, and for this reason, an expert guide is necessary to accurately evaluate the technical needs of your plants and so make the right choice.


First things to take into account

While selecting industrial silencers, it is essential to consider three main factors: physical specifications, performance specifications, and mounting attachments.

  • By physical specifications, we refer to the size of the inlet and outlet, which can differ from round, circular, or oval-shaped cross sections to square or rectangular shapes.
  • Performance specifications include noise attenuation, maximum pressure rating, and maximum flow rating.
  • Mounting attachments may include male threads, female threads, flanges, and pipe clamps.


Main applications of Industrial Silencers

Industrial silencers have a wide range of applications. Most silencers available on the market are purpose-built to diminish noise produced by specific industrial pieces of equipment, like engines, air or gas compressors, vacuum pumps, or turbines.

Major categories of silencers according to their common application field:

  • Vent/Blowdown Silencer: these silencers are designed for rapid exhaust or venting applications, commonly known as “blow off” silencers.
  • Compressor Silencer: usually tailor-made for air or gas compressors to minimize noise generated during their operation.
  • Blower/Fan Silencer: designed specifically for the intake or outlet of fans or blowers. These silencers may incorporate features like air filters and other enhancements.
  • Pressure Relief Valve Silencer: developed for use with backpressure or pressure relief valves to attenuate noise associated with relief blow-offs.
  • Turbine Silencer: intended for noise reduction at the inlet and/or outlet ports of turbines, typically applied to gas turbines.
  • Vacuum Pump Silencer: specifically designed to reduce noise at the inlet and/or outlet of vacuum pumps.
  • Engine Silencer: utilized to reduce noise from industrial engines. Both inlet and outlet silencers can be used.
  • Chimney Silencer: designed to mitigate noise from combustion exhaust systems, commonly found in industrial boilers, ovens, and furnaces.


The design features every Silencer should follow

When selecting an industrial silencer, it is essential to carefully consider various technical features to ensure that the equipment aligns perfectly with your plant’s requirements.

  • Acoustic features: the silencer should consistently deliver the desired level of sound power reduction across different frequency ranges; this quality is measured by Dynamic Insertion Loss (DIL). It is important to note that the acoustical performance of a silencer can be influenced by factors like temperature, gas characteristics, system configuration, and physical layout of the operating environment.
  • Geometrical features: the silencer needs to be appropriately sized and shaped to fit within the available space.
  • Mechanical features: the silencer should require minimal maintenance and provide high efficiency over extended periods. Additionally, its design should incorporate durable materials capable of withstanding elevated temperatures and potentially corrosive gasses.
  • Aerodynamic features: airflow passing through the silencer will cause a pressure loss, which can impact its acoustic performance. Therefore, the design should take into account the dynamics of airflow.
  • Economic features: it is crucial to consider the overall cost-effectiveness of the silencer, taking into account factors such as initial investment, operational efficiency, and maintenance requirements.


Types of Silencers by Stopson Italiana

Stopson Italiana’s Industrial Silencers are designed to handle both cold and hot gasses.

Our Silencers are of absorptive type for exhaust systems of engines or small boilers and incorporate reactive properties as well. Additionally, they have a combination of absorptive and reactive features for venting systems.

Our Silencers are available in circular or rectangular shapes and can be used in atmospheric or pressurized conditions with various gasses, temperature ranges, and applications. They can provide sound attenuation of up to 70 dB, effectively reducing residual noise to a sustainable level.

Our offering mainly includes:

  • Vent Silencers, which are engineered to minimize the noise generated by exhaust piping that release pressurized gaseous fluids such as air, vapor, natural gas, nitrogen, oxygen, carbon dioxide, and more into the atmosphere.
  • Engine Exhaust Silencers, which are conceived to be used on diesel and gas engines, as well as on industrial low/middle power gas turbines.
  • Intake & Stack Silencers, which reduce noise emissions in air filtration systems, inlet ducts, ventilation systems, by-pass stacks and exhaust ducts.
  • Ventilation & Duck Silencers, designed to reduce noise level through the duct generated by any sound source, such as fans, conditioning units, etc.
  • In-line Silencers, pressurized equipment which are built to reduce the noise generated by valves or compressors.

⟶ To Discover more about the range of Silencers offered by Stopson Italiana click HERE.


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