Internal Structural Elements

The internal perforated structure of our silencer is rectangular in cross-section, which minimizes flow resistance while ensuring effective acoustic attenuation. This structure is fabricated with bent-edge panels to increase rigidity and stability, making it more resistant to temperature fluctuations and mechanical stresses in the operating environment.

The silencer's internal perforated assembly consists of two interlocking segments with a dilation (expansion) element between them. This design allows for thermal expansion movements to be absorbed, preventing material fatigue and structural deformation. The built-in expansion element ensures the silencer maintains its structural integrity over long-term operation, despite changes in temperature.

Inside the silencer, acoustic baffle panels are arranged to form a unit protected by a perforated outer sleeve. Within each baffle, a layer of heat-resistant textile and a high-density, ceramic-based sound-absorbing material are installed to provide effective noise reduction. The baffles are secured at multiple points to the internal frame, which minimizes vibration and mechanical impacts caused by the gas flow.

The stability of the silencer's internal structure is further ensured by sliding, star-shaped support elements. These supports prevent the internal perforated components from shifting within the outer casing and keep the assembly centered in the flow path.

Insulation and Outer Casing

To preserve the heat resistance and longevity of the internal sound-absorbing layers, the insulation material is wrapped in a heat-resistant textile and placed against the inner wall of the perforated structure. This prevents the high-velocity flue gas flow from causing material erosion or detachment, thus maintaining the silencer's noise attenuation performance over time.

Depending on the silencer's size, the insulation is composed of either ceramic fiber or (for larger diameters) a combination of ceramic fiber and high-temperature rock wool. This ensures adequate thermal protection and acoustic performance for the silencer under varying conditions.

The outer casing of the silencer is made of stainless steel, providing long-term resistance to corrosive condensates from the flue gases and to high thermal loads. At the casing's connection points, we install 5 mm thick rolled flat steel rings inside the shell flanges to increase mechanical stability and ensure durable mounting of the casing.

Our experience shows that acidic and corrosive condensates from flue gases (such as sulfuric acid or nitrogen oxide condensate) can quickly damage carbon steel casings, especially along weld seams, leading to cracks and leaks. Such degradation reduces system efficiency and safety. By using a stainless steel outer casing, we ensure our silencers offer long-term corrosion resistance, greatly reducing the risk of structural deterioration and minimizing maintenance needs.

During operation, condensate formation inside the silencer is inevitable. Without proper drainage, this condensate could cause corrosion or operational issues. To counter this, each silencer's outer casing is equipped with a 5/4" condensate drain connection, which allows for the controlled removal of accumulated condensate.

Flue gas silencers play a vital role in reducing the aerodynamic and mechanical noise generated by exhaust gas flow. High-velocity flows, turbulent vortices, and pressure differentials in exhaust systems create significant noise — our silencers mitigate these effects. Using silencers is essential not only to meet noise emission regulations but also to maintain operational safety and structural integrity of the system.

Our silencers operate on the absorption principle, enhanced with internal baffle structures. The noise reduction is achieved by high-temperature-resistant sound-absorbing materials placed inside the silencer, protected behind perforated metal panels.

One major advantage of our silencer design is the use of a stainless steel outer shell, unlike many standard silencers on the market that use carbon steel. The stainless construction, combined with robust internal bracing, ensures a longer lifespan by resisting corrosion from flue gas condensates. This design choice leads to improved durability and lower maintenance over the life of the silencer.

Our flue gas silencers effectively reduce the aerodynamic and mechanical noise produced by industrial exhaust gas systems. These noises typically result from high-velocity flows, turbulence, and pressure fluctuations within flue gas ducts. The installation of silencers is essential not only to meet noise emission regulations but also to ensure operational safety and maintain structural integrity.

Our silencers employ high-temperature-resistant, sound-absorbing materials contained within a perforated metal structure to achieve effective noise attenuation.

One significant advantage of our flue gas silencers is that their outer casing is fabricated from stainless steel. This contrasts with many silencers available on the market, which typically utilize carbon steel casings. Experience has shown that acidic and corrosive condensates (such as sulfuric acid or nitrogen-oxide-based condensates) can rapidly cause corrosion damage to carbon steel casings, especially at welded seams. Over time, this corrosion can lead to cracking, structural deterioration, and flue gas leakage, significantly compromising system efficiency and safety. By using stainless steel outer casings, our silencers offer superior corrosion resistance, prolonged service life, and significantly reduced maintenance requirements.

Material Use and Noise Attenuation

Our flue gas silencers are constructed from premium materials (typically stainless steels such as 1.4571 or 1.4841), chosen according to the specific application requirements. Key material specifications include:

• The internal perforated structure and baffle casings are made from 2 mm thick perforated sheet, reinforced with 2 mm solid sheet at attachment points.
• The expansion (dilation) element between sections is made of 3 mm thick stainless steel.
• The inlet and outlet connecting sections are made from 2 mm thick steel as standard, with 3 mm thickness available for higher stress requirements.
• The outer casing is made of 3 mm thick stainless steel sheet, stiffened with 5 mm thick stainless reinforcing strips at the connection flanges.

Our standard silencers provide a noise attenuation of approximately 35–50 dB(A), depending on the silencer type and design. The exact performance is determined by the specific configuration and dimensions chosen for the application.

Thanks to their robust construction, our silencers offer high mechanical strength and a long service life, even under extreme operating conditions. We optimize the dimensions and material thickness not only to meet noise reduction targets but also to suit the operating temperature and pressure conditions. As a result, a typical DN500 silencer can weigh up to 1.8 tons, reflecting the heavy-duty materials and precise manufacturing techniques used to ensure structural rigidity and durability.

Contact & Quote Request: