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FAQ

What is the difference between power level and sound pressure?

The sound power level is an intrinsic characteristic of the source, while the sound pressure level is the value normally measured. The latter depends on the distribution of the sound power level on the measuring surface.

Usually, the sound pressure level is measured, which is also what our ear perceives. As a result, the sound power level can be calculated from this value.

Absorbent silencer: The vibrating energy that generates the audio is dissipated into heat as a result of frictional forces due to the interaction between flow and porous media. It is particularly efficient at high frequencies. Reactive silencer: Evolving through different sections and volumes, the fluid changes its acoustic properties, thereby inducing a partial reflection of the incident acoustic wave and reducing the transmitted noise. It is ideal for low frequencies, and not very effective at high frequencies.

Yes, all our certifications can be downloaded/searched here.

Stopson Italiana has been designing and manufacturing silencers and other soundproofing products since 1965.

Stopson Italiana can count on a global network of customers. Some of our most significant projects/installations can be found here.

Yes, our products have been tested several times directly or by third parties.

Stopson Italiana solutions are tailor-made according to customer specifications. However, for vent silencers, for example, specimens with a flow rate of 700 t/h were produced.

Stopson Italiana designs pressure parts of silencers according to ASME codes. Calculation reports, welder qualifications and welding procedures can be issued on request.

Yes, the diffusers of our silencers can be PED certified and CE marked with regard to risk control and safety for pressure equipment, if they fall within the applicable category.

Here is a series of characteristics necessary for the quotation of a tailor-made offer: Fluid type or its composition, flow rate, pressure and temperature upstream of the valve, specifications on the pipes of the silencer upstream (e.g. size, thickness, flange, maximum allowable pressure drop) and acoustic requirements (e.g. required sound pressure level and position of the measuring point referred to the position or extension of the silencer).

Yes, Stopson Italiana can provide highly engineered solutions according to the customer’s needs also for the treatment of external surfaces.

Our silencers are mainly designed for superheated steam, saturated steam (steam quality over 92-93%), air and nitrogen. In addition to these common applications, we can process any type of gaseous mixing. A special application is related to oxygen ventilation, so we can design silencers according to the high safety standards required.

Since the valve is generally the source of noise, the valve and upstream piping are sources of noise that can severely limit the performance of silencers. Stopson Italiana can provide advice to reduce these noise problems, allowing you to meet overall acoustic requirements.