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Absorptive Silencers
Absorptive Silencers
Is an absorptive silencer right for your application? The answer: it depends. That is why Universal is uniquely positioned in the industry, because 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 acoustical system experts are at your disposal.
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. More technically, 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 inflicts very little air flow restriction.
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. 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. Mild steel construction, 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
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. Mild steel construction; 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