A Guide for Specifying and Choosing Vent and Blowdown Silencers

When you are tasked as an engineer to create a specification for the buy of a vent or blowdown silencer, it might appear somewhat overwhelming due to the higher mass flows, pressures and temperatures involved. It doesn’t need to be. This short article will define a vent silencer specification data sheet and go over every of your significant fields that should be completed around the type, which includes background considerations. The facts imparted encompasses the applied knowledge of acoustical theoreticians and vent silencer industry practitioners from over the final 50 years. The outcome really should be a improved understanding of your things involved and data required to specify and choose the appropriate vent silencer to get a provided application, without the need of over- or under-designing it. Get additional data about fan silencers
This short article defines a vent silencer specification information sheet and covers each on the essential fields that must be completed on the kind. These fields contain these that must be identified by the purchaser and these that has to be supplied by the silencer vendor. Understanding all of the aspects involved will make to easier for you to select the best vent silencer for the application at hand. But very first, we will introduce vent and blowdown silencers and review the basic things involved in predicting the noise generated by high-pressure vents. Listed here are the vent and blowdown applications that call for silencers:
Steam venting in power generation applications
Natural gas compressor station and pipeline blowdowns
Approach control and relief valves in industrial applications
Blowdown tanks and autoclaves
Bypass valves on blowers and compressors
Steam ejectors and hogging vents
Discharge of high-pressure gas to substantially lower pressure environment (atmosphere).
The high-pressure gas is usually steam or organic gas, which accounts for greater than 90% of your applications, too as air, nitrogen, oxygen, hydrogen, carbon dioxide, combinations thereof, and other gases. 
Note that the terms “vent silencer” and “blowdown silencer” refer to the application for which each and every is used. They may be equivalent silencer designs and are known as vent silencers when being used to vent at a continuous flow price for a period of time. They're known as blowdown silencers once they are blowing down a finite volume of gas starting at a higher pressure and ending at a low pressure more than a provided time. Vent silencers are sized for continuous flow and blowdown silencers are sized for maximum flow. Noise Generated by High-Pressure Vents More than the years, there has been an excellent deal of work done within the field of predicting the noise generated by the high-pressure venting of gases. This has resulted in the development of numerous empirical models supported by field evidence and tabular data on the topic. You will discover a number of open sources within the public domain delivering access to these models and databases. We will not review these models but will touch around the key things involved in predicting the noise generated by higher pressure vents.
Elements Influencing Noise Generated by High-Pressure Vents.
Mass flow - the larger the mass flow, the noisier it becomes.
The type of gas and its molecular weight/specific gravity - lighter gases are noisier.
Temperature - greater temperatures lead to lighter gas flows, and hence, larger noise levels.

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