WHAT IS A BLOWOFF SILENCER?                                                       

A blowoff silencer is a device used to reduce unwanted noise created by gas or steam flow in a pipeline discharging directly into the atmosphere. This noise can be generated by turbulence around any obstacle in the line that suddenly restricts or changes the direction of flow, such as a valve or an orifice.
In a blowoff system, the primary release of noise energy occurs at the open stack exit. The blowoff silencer is installed either within the stack or at the stack outlet to intercept this noise before it escapes into the environment.

There are two fundamental noise reduction principles used in passive silencer design. Dissipative components (using sound absorbing material) provide balanced noise reduction over a broad frequency range. Reactive components (using resonant reflections within tuned chambers and passages) provide peak noise reduction in a more concentrated frequency band. The Fluid Kinetics Blowoff Silencer combines both dissipative and reactive technology in a highly efficient design.

HOW DOES IT OPERATE?

As the gas flow enters the silencer, the inlet diffuser with an array of small diameter holes creates a reflective barrier to noise transmitted from upstream devices. The Fluid Kinetics Blowoff Silencer uses a controlled combination of diffuser hole size and spacing to maximize the effectiveness of this barrier. The result is a net decrease in system vent noise, particularly in the low frequency range of the noise spectrum.
The silencer expansion chamber provides a reactive volume within the flow path, to further reduce low frequency noise. The 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.

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