Absorptive Silencers

Is an absorptive silencer right for your application? 

The answer: It depends. That is why UniversalAET is uniquely positioned in the industry; we can take you through the process of selecting the right silencer for your needs. A global network of business offices and a large team of experienced acoustic system experts are available to determine the best product to meet your needs.

The absorptive silencer is the classic dissipative design, obtaining its noise control properties from the basic fact that noise energy is effectively “absorbed” by various types of fibrous packing materials. As sound waves pass through the spaces between the tightly packed, small-diameter fibers of the absorptive material, the resulting viscous friction dissipates the sound energy as small amounts of heat.

Good Silencers for High Noise Frequencies

Absorptive silencers are very effective on high noise frequencies (500-8,000 Hz). At frequencies above and below this range, attenuation performance progressively diminishes. Since noise is absorbed by the packing material, absorptive silencers do not rely on internal baffles, tubes or other restrictive devices to achieve noise reduction. Consequently, absorptive silencers generally employ a “straight-through” or similar internal designs which cause minimal air flow restriction.

The SU Series Absorptive Silencer

The SU Series includes three grades of annular design silencers, the SU5, SU4 and SU3 series. All include an annular flow path and either full or partially blocked line of sight. The SU Series features mild steel construction and a primer-coated exterior.

SU Series Common Applications

  • Inlet and discharge of high-speed, low-pressure centrifugal compressors and blowers
  • Industrial fan inlet and discharge
  • High-pressure centrifugal compressors inlet
  • Gas turbine inlet
  • Dry vacuum pump discharge
  • Some low-pressure vents
  • High-frequency noise sources
  • Inlet of turbocharged reciprocating engines

The U5 Series Absorptive Silencer

The U5 Series is a premium straight-through absorptive silencer. It provides excellent noise attenuation due to its very high length-to-diameter ratio. It is especially well suited for inlet service on small rotary positive or centrifugal blowers, or the discharge of vacuum pumps. It features mild steel construction with enamel paint.

U5 Series Common Applications

  • rotary positive/centrifugal blowers
  • vacuum pump discharge
  • air valves and cylinders
  • small, low-pressure vents
  • high-frequency noise sources

The U2 Series Absorptive Silencer

The U2 Series is an economical straight-though silencer for applications requiring lower-degree noise attenuation. It is fundamentally similar to the U5 Series but has lesser attenuation due to its relatively low length-to-diameter ratio. It features mild steel construction and a primer-coated exterior.

U2 Series Common Applications

  • Intermediate-size rotary positive blower inlet
  • Centrifugal blower inlet or discharge
  • Intermediate-size dry vacuum pump discharge
  • Gas turbine inlet
  • High-speed centrifugal compressor inlet
  • High-frequency noise sources