steam Silencers reduce the noise produced by the expansion of steam from elevated pressures to atmospheric pressure. These absorptive silencers are used to suppress noise generated by high velocity gas streams such as steam vents, safety relief valve outlets, system blow downs, purge outlets and steam flow in a pipeline discharging directly into the atmosphere. Each vent silencer is designed to attenuate the noise level to the required sound pressure level criteria at a given distance from the silencer.
In steam silencer we have tow section in bass diffuser and in acoustic chamber. The diffuser provides controlled pressure expansion to atmosphere and uniform flow distribution through the acoustic section of the silencer. The inner shell is solid to prevent shell radiated noise and migration of the acoustic fills. The transmission loss across the plenum and bottom head is comparable to the silencer attenuation.
The following information is required to optimize a vent silencer :