FK Model EVO Vent Silencer

FK’s EVO Vent Silencer is used to reduce noise from a gas pipeline discharging directly into the atmosphere through a safety relief valve or a control valve. This noise is generally as a result of high turbulence inside the valve during pressure reduction. The primary release of this noise energy in a safety relief system is via the open stack exit. The EVO vent silencer is installed either within the stack or at the stack outlet to intercept this noise before it escapes into the environment.

Our EVO vent silencer makes use of the passive silencer design. There are two fundamental noise reduction principles involved in passive silencer design.

1. Dissipative noise reduction: dissipative components made of sound absorbing material provide balanced noise reduction over a broad frequency range.

2. Reactive noise reduction: reactive components using resonant reflections within tuned chambers and passages provide peak noise reduction in a more concentrated frequency band.

In addition, the Fluid Kinetics EVO vent silencer uses small size passage geometry for shifting frequency and eliminating any shock waves.

HOW DOES IT WORK?

As the gas enters the silencer, the inlet diffuser with an array of small diameter holes acts as a reflective barrier to the noise energy carried within the stream from the safety relief valves. A controlled combination of diffuser hole size and spacing are used to maximize the effectiveness of this barrier. The EVO vent silencer uses a QUIETPAK to further break down the jets into smaller sizes thereby increasing the noise frequency and eliminating any potential for shock wave formation from pressure reduction at the inlet diffuser. The result as you can guess is a net decrease in system vent noise!

Next, the silencer expansion chamber serves as a reactive volume within the flow path, to further reduce low frequency noise. The resulting expanded flow continues at a much reduced velocity through the annular passages of the acoustic core.

Final treatment of the noise is achieved through the sound absorbing characteristics of the acoustic pack, combined with the resonant properties of the perforated facing material.

These vent silencers are a combination of our field-proven, time-tested diffusers and our QUIETPAK. These EVO vent silencers provide dramatic improvements in acoustic performance and offer significant reductions in overall silencer height and weight. Furthermore the design incorporates minimal pressure drop to the system.