From filter houses and intake silencers to complete exhaust systems and acoustic enclosures packages, we are the right partner for gas and steam turbines, compressors, generators and pumps applications. STOPSON is an approved supplier of major OEMs for the most demanding on-shore and off-shore installations.

Gas and Steam Turbines

STOPSON ITALIANA can provide discrete noise solutions and turnkey installation for turbine applications such as:

  • Combustion air intakes with filtration and silencing systems
  • Enclosures
  • Ventilation systems
  • Auxiliary systems
  • Exhaust stack silencing systems

The selection of the inlet filtration system is an important stage as poor quality inlet air can significantly impact the operation, performance and life of the gas turbine. Some of the consequences of poor inlet filtration include fouling, erosion, and corrosion. In order to minimise degradation, we place a huge effort in the design of the inlet filtration system for any gas turbine package.
Once a suitable filter system has been selected, we also provide a range of ductwork and filtration silencers to minimise the noise of fast flowing air into the inlet manifold before reaching the compressor. These silencers are typically of a splitter type configuration to minimise pressure drop and increase the airflow into the compressor chamber.

In addition to providing clean air into the compressor chamber, STOPSON also designs and installs suitable ventilation in order to regulate the heat inside the acoustic enclosure and ensure oil and ancillary equipment are kept cool.
A turbine soundproofing enclosure can be used for different purposes, including weather protection, turbine cooling, fire prevention system, effective noise barrier.

STOPSON has extensive experience of several years in providing the best soundproofing enclosures for a wide range of gas and steam turbines plants. We usually work closely with the OEM or the end user in order to achieve the required acoustic performance while ensuring proper ventilation inside the enclosure to keep temperature and pressure within allowable limits for safe equipment operations.
Separate enclosures are usually provided for turbomachinery auxiliaries, i.e. fuel gas, lube oil, pumps, etc.

On-base enclosures are usually applicable to small and medium size gas turbines, where acoustic performances should be combined with space constraints, fire fighting, ventilation and lighting requirements, as well as easy access to the equipment. Thanks to an extensive experience in marine applications, Stopson can support any high demanding requirement for taylor-made on-base installation.

On large machines the off-base option is the most common, featuring a standing structure closed by prefabricated panels and proper fastenings and joint covers for maximum acoustic efficency. Equipment easy mantainability is achieved by means of properly sized removable panels either on the wall or on the roof to allow turbine's rotor extraction. Ventilation system, including air intake filters, are designed to reach a uniform internal diffusion and roof-extraction with inlet and outlet automatic shutters for the extinguisher tight of the fire fighting system.
Enclosure structure is designed according to the most used international standards as well as local regulations and specific ambient conditions, i.e. wind, snow, seismic, etc.
Wall and roof panels are made of galvanized steel supporting corrugated pre-painted plates on the outer side and pre-painted or galvanized perforated plates on the inner side. Panel internals are filled with incombustible mineral wool and completed with fluctuating plates placed on anti-vibration gaskets in order to obtain an optimized and durable acoustic insulation.

Main and by-pass stack, where present, require insertion of a suitable sound-proofing device, properly sized depending on exhaust gas characteristics, frequency of operations and proximity to residential areas.
The custom-made, splitter-type cartridge silencer is eventually installed at the top end of the chimney of the gas turbine exhaust. In order to allow proper operation of the gas turbine, the silencer shall be designed to make sure to withstand flow-dynamics parameters of the existing engine configuration thus limiting to the minimum the impact on pressure losses while reducing noise to the required level.

Particular measures on constructive aspects shall be also taken to ensure resistance of the equipment to the strict working conditions. Supporting structures for the splitter silencer must be carefully designed to withstand high operation temperatures in a limited available space and allowable weight with the aim to limit any change to the stack configuration.

Off-base Turbocompressors Enclosures

Indoor Gas Turbine Enclosure

Biomass Steam Turbine Enclosure

Steam Turbine and Generator Enclosure

On-base GT Enclosure

Main & By-Pass Stack Cartridge Silencers

Main Stack Silencer

HRSG Exhaust Silencers



Gas turbines are in most cases coupled with electric generators, which are noisy machinery as well.

Furthermore, these machines have a noise spectrum with a dominant low-frequency range, therefore they require high efficacy of acoustic panels, whose special composition has been studied for low frequencies attenuation.

In order to keep the acoustic performance high and to prevent a leakage outside the enclosure, we also provide various access panels and/or doors for personnel and for maintenance, that maintain a constant attenuation.
A ventilation system has to be applied according to manufacturer prescriptions and the necessary openings must be equipped with proper silencers, fire-fighting shutters, eventual rain protection and fire detection or extinguishing.

The enclosure design is quite often specific to allow generator rotor extraction from one wall and bushings maintenance with internal lifting devices, that are anchored to the enclosure structure.

Compressors, Pumps & Blowers

Centrifugal compressors, both for air, natural or other gases, need acoustic sound proofing that many times cannot be limited to the acoustic enclosure.

When they bring fluid from the open atmosphere they absolutely need an air intake silencer with its special design able to guarantee noise abatement within the imposed pressure drop. After being used several times, the thickness of connected pipes of an in-line compressor is not enough to keep the emitted noise within safe limits for workers and/or environmental protection standards. In those cases it could be necessary to adopt an in-line silencer, in addition to the acoustic insulation for pipes.
This silencer becomes a pressure vessel and has to be carefully designed for the acoustic and fluid-dynamic performances, but also in order not to spread fibers into the stream. In some cases, an in-line silencer at compressor outlet is also required to further reduce overall noise level.

When a blower with a turbine is installed, an air inlet or air outlet or both silencers must be applied, together with a proper sound-proofed enclosure. High attenuation in particular on high frequencies and limited pressure drop available often require a special silencer design even if of absorption type.
Corrosion resistance and application on a circuit that do not allow spreading of particles, once again impose particular caution on silencer design and manufacturing.

Pumps applications do normally require as well the installation of an acoustic enclosure to provide proper noise attenuation.


Forced Air Enclosure

Print Friendly, PDF & Email