A Guide for Specifying and Choosing Vent and Blowdown Silencers

Posted by mildas moser on December 4th, 2019

When you are tasked as an engineer to create a specification for the obtain of a vent or blowdown silencer, it can seem somewhat overwhelming because of the higher mass flows, pressures and temperatures involved. It doesn’t have to be. This short article will define a vent silencer specification data sheet and go over each and every in the critical fields that should be completed around the form, like background considerations. The information and facts imparted encompasses the applied knowledge of acoustical theoreticians and vent silencer sector practitioners from over the final 50 years. The outcome should really be a greater understanding on the things involved and info needed to specify and select the appropriate vent silencer for any given application, without over- or under-designing it. Get much more data about vent silencers

This short article defines a vent silencer specification information sheet and covers each of your important fields that have to be completed around the type. These fields include those that has to be identified by the purchaser and those that must be supplied by the silencer vendor. Understanding all the aspects involved will make to a lot easier for you to select the appropriate vent silencer for the application at hand. But 1st, we are going to introduce vent and blowdown silencers and review the fundamental elements involved in predicting the noise generated by high-pressure vents. Listed right here would be the vent and blowdown applications that require silencers:

• Steam venting in power generation applications
• Organic gas compressor station and pipeline blowdowns
• Course of action 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 decrease pressure atmosphere (atmosphere).

The high-pressure gas could be steam or all-natural gas, which accounts for greater than 90% with the applications, at the same time as air, nitrogen, oxygen, hydrogen, carbon dioxide, combinations thereof, along with other gases.

Note that the terms “vent silencer” and “blowdown silencer” refer towards the application for which each and every is used. They are equivalent silencer designs and are known as vent silencers when becoming used to vent at a continuous flow rate for any period of time. They're known as blowdown silencers once they are blowing down a finite volume of gas beginning at a higher pressure and ending at a low pressure over a given time. Vent silencers are sized for continuous flow and blowdown silencers are sized for maximum flow. Noise Generated by High-Pressure Vents Over the years, there has been a good deal of work carried out within the field of predicting the noise generated by the high-pressure venting of gases. This has resulted within the development of quite a few empirical models supported by field proof and tabular data around the topic. There are a number of open sources inside the public domain providing access to these models and databases. We are going to not review these models but will touch around the key elements involved in predicting the noise generated by higher pressure vents.

Factors 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 result in lighter gas flows, and for that reason, higher noise levels.