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Exhaust silencers

INERCO designs and manufactures reactive-dissipative silencers to reduce the noise produced in the exhaust of diesel and gas engines. The main applications of these silencers are the large engines of energy plants, ship engines (naval industry) and auxiliary generator.

Exhaust silencers are a passive element of noise control, which INERCO designs customized for each necessity, using Finite Element Method (FEM) software. There is a wide range of silencers depending on the required attenuation and operating temperature: usual range between 15 and 60 dBA.



These silencers are composed of two main stages:

  • The reactive stage, which is designed to control pressures and velocity fields. The low frequencies (up to 250 Hz) are attenuated in this stage due to the reflection of the sound waves.
  • The dissipative stage, where the medium-high frequencies are controlled (from 250 Hz to 16 kHz).


Design parameters:

The design, size and material selection are variables with impact in the cost of the silencers. Our engineers select the silencers that optimize your economic investment, fulfilling all the technical requirements. We do the comparative analysis between silencer size and acoustic attenuation to determine the optimized cost in each case.

We design and manufacture silencers for engines with power over 10,000 HP, with inlets up to 1,200 mm.

The design of the exhaust silencers depends on the following factors:

  • Fluid conditions: mass flow rate and temperature.
  • Incident noise (noise spectrum at the inlet of the equipment)
  • Required attenuation, required noise level at the discharge of the silencer or at a specific distance of it.
  • Nominal diameter, material and thickness of the connection pipe.
  • Pressure drop required.
  • Connection type: flanged or welded.
  • Physical space, weight or materials restrictions.
  • Position and location of the silencer.
  • Sparks arrestor (if required)


Design reference normative:

  • ISO 9001:2008: our manufacturing system is according to quality requirements specified by this standard.
  • ASME VIII: code for the design of the silencers.
  • ASME Section IX: normative of welding procedure.
  • ASME B 16.5 y ASME B 16.25: welding procedure between flanged connections and welded connections (BW).


Additional information:

  • INERCO's database contains a significant number of noise spectrums for different engines. We can design a silencer just knowing the engine power, the temperature and available pressure drop.
  • The acoustic performance can change depending on the location of the silencer and the rest of the elements. For this reason, we recommend to the client to provide us all the information when asking for quotation.
  • The temperature of the exhaust flow is an essential factor in the design of these kind of silencers.
  • There are two possibilities depending on the orientation of the inlet and outlet: in line or orthogonal (90º).
  • We recommend to locate the silencer as close as possible to the gas exhaust. Sometimes it is necessary to complement the insulation of the system using additional acoustic coating over the silencer and the exhaust pipe.
  • • When a greater attenuation is required it is possible to connect more than one silencer in series. The limiting factor would be the admissible pressure drop.
  • INERCO uses FEM (Finite Element Method) software to design the silencers, studying the mechanical performance (in order to avoid resonance and undesirable vibrations) and the fluid-dynamic performance (velocities, pressures, densities, temperatures).


INERCO commitment with the supply:

  • Customized design for each case
  • Acoustic and fluid-dynamic design of the silencer
  • Mechanical and acoustic guarantee
  • Worldwide delivery
  • Own manufacturing to assure the quality and the delivery term
  • Manufacturing dossier and 3D drawings
  • Document and logistics management:
    • Welding homologation dossier
    • Material certificates
    • Inspection Test Plan
    • Painting procedure
    • Quality procedure
    • Non-destructive tests (penetrant dyes, X-rays)
    • Verification check-list
    • Nameplate
    • Packing
    • Packing-list
  • Fixed prices
  • Quality control and inspection of each silencer
  • Technical advice of the installation and maintenance
  • Operating, maintenance, stocking and packing handbook