Customer reviews | ITS Acoustique
Construction of an exhaust silencer for an industrial genset
ITS has participated in the construction of an exhaust silencer for an industrial genset, in order to reduce noise emissions (related to the evacuation of flue gases) from a heat engine used for energy production.
The soundproofing device has been inserted into the exhaust line, making it possible to reduce the noise upstream of the chimney of the thermal power station, so as to avoid any noise nuisance for the neighborhood which, otherwise, could have been caused by a excessive sound power level at the outlet.
Such an establshment, classified for environmental the protection (ECEP), is subject to a strict regulation for the prevention of neighborhood noise, based on emergence i.e. on the difference between the A-weighted equivalent continuous pressure levels of ambient noise (establishment in operation) and residual noise (in the absence of noise generated by the establishment, but measured over the operating period of the establshment): 3 dB (A) is the permissible emergence for the period 22h - 7h, as well as Sundays and public holidays, for Zones with Regulated Emergence (ZRE) when the ambient noise level (including the noise of the establshment) is greater than 45 dB (A).
A careful dimensioning must therefore be carried out in the case of an exhaust silencer for an industrial genset, because its acoustic performance must not generate a total pressure loss that is too high, affecting the efficiency of the installation.
In addition, durability is a criterion of choice for an exhaust silencer for an industrial genset.
Construction of a large sized noise barrier wall
(height approximately 35 m, area approximately 1500 m2) around a Heat Recovery Steam Generator (HRSG) in a high capacity gas-fired power plant.
The construction of a large sized noise barrier wall is required when it comes to limiting the environmental noise impact of noise sources as large as a Heat Recovery Steam Generator (HRSG) of which hundreds of m2 of walls are subjected to major vibro-acoustic sollicitations, with respect to which their capacity to limit the sound transmission is insufficient.
The implementation of an acoustic screen based on metal acoustic insulation panels with an absorbing face (noise source side) makes it possible to limit the spread of noise towards residents who could otherwise be disturbed, even at great distances a fortiori in the case of an uninterrupted installation (this is the case of a power plant), especially during the night.
The application of the regulations in force, based on the emergence criterion i.e. the difference between the A-weighted equivalent continuous pressure levels of the ambient noise (instalation in operation) and the residual noise (in the absence of the noise generated by the installation, but measured over the period of operation of the installation) imposes a specific soundproofing action.
The presence of many singularities (structural elements for support of ancillary equipment, pipes, ducts) makes it necessary a careful study allowing the prefabrication of sub-assemblies of metal construction whose installation (with specific lifting means: crane and lfting plaforms) will be facilitated neither by the height of the construction nor by the co-activities with other fitting companies, in the case of the construction of a thermal power station.
The construction of a large sized noise barrier wall is a project whose technical and organizational challenges are major and require the expertise of business partners such as those that ITS can find.
Improvement of acoustic comfort of an activity room for children
Improving the acoustic comfort of an activity room for children is a recurring problem in a nursery, especially if the construction is based exclusively on sound-reflecting materials such as concrete or glass. For then ambient sound levels are usually too high, which is causing the occupants, young and older a nuisnace whose consequences are stress and excessive fatigue. As a result, children do not have favorable conditions for learning, and supervisory staff have difficulty in performing the tasks they are required to perform in their professional activities: they all suffer from an unfavorable sound environment.
ITS can help improve the acoustic comfort of a children's activity room by marketing absorbent materials that reduce the harmful effects of excessive reverberation. The selection of these absorbing materials in terms of quality (which absorption coefficient to retain at the frequencies corresponding to the envisaged sound emissions ?) and in quantity (which surfaces to cover e.g. for the ceiling and on the walls ?) is the subject of a study based on on the measurement of an indicator of the acoustic quality of the considered space, in the state where it is when ITS has been requested: the reverbetaion time (duration), which can be subject to a result guarantee after works, illustrating the quality of the soundproofing performed.
An absorbing ceiling or suspended baffles, a wall absorbing lining are common components of any soundproofing system envisaged for the improvement of acoustic comfort of an activity room for children.