Dürr Universal Silencers — Noise Abatement
Compressor Silencers
Reciprocating · Rotary Screw · Centrifugal — Inlet & Discharge
| Compressor Type | Inlet Models | Discharge Models |
|---|---|---|
| Reciprocating (Piston) | UCI-R, CB-R | UCD-R, CBD-R |
| Rotary Screw (Oil-Flooded) | UCI-S, CB-S | UCD-S, CBD-S |
| Rotary Screw (Oil-Free) | UCI-S, CB-S | UCD-S, CBD-S |
| Centrifugal | Custom Absorptive Inlet | Custom Absorptive Discharge |
Dürr Universal Silencers designs and manufactures intake and discharge silencers for all types of industrial compressors. Reactive (tuned chamber) designs are used for reciprocating compressors where pulsation frequencies are well-defined; absorptive and combination designs address the broadband noise profiles of rotary screw and centrifugal compressors. All silencers can be custom-engineered for specific pipe sizes, operating pressures, temperatures, and gas compositions. ASME code construction is available.
Reciprocating Compressor Silencers
Reciprocating (piston) compressors generate strong pulsations at the fundamental frequency and harmonics determined by the compressor speed and number of cylinders. Universal Silencer designs reactive (tuned chamber) silencers specifically matched to the compressor's pulsation spectrum for both intake and discharge service. Combination reactive/absorptive models are available where higher overall insertion loss is required.
Inlet Models
Multi-chamber reactive inlet silencer tuned to the fundamental pulsation frequency and harmonics of the reciprocating compressor. Chamber dimensions are calculated from compressor RPM and cylinder count. Effective at the discrete frequencies that dominate reciprocating compressor intake noise.
Combines tuned reactive chambers with absorptive (dissipative) packing to provide both low-frequency pulsation attenuation and broadband high-frequency noise reduction in a single unit. Higher overall insertion loss than the UCI-R alone. Preferred where both pulsation control and broadband attenuation are required.
Discharge Models
Multi-chamber reactive discharge silencer for the high-pressure discharge side of reciprocating compressors. Tuned to the discharge pulsation frequency. Higher pressure ratings than inlet models to accommodate discharge pressures. The primary choice for discharge silencing on reciprocating compressor systems.
Combination reactive/absorptive discharge silencer for maximum insertion loss on the discharge side of reciprocating compressors. Addresses both the discrete pulsation frequencies and the broadband noise component present at compressor discharge.
Rotary Screw Compressor Silencers
Rotary screw compressors generate broadband noise with tonal components at the lobe-pass frequency. Universal Silencer provides absorptive and combination reactive/absorptive silencers for both oil-flooded and oil-free rotary screw compressors. Inlet silencers are designed to minimize pressure drop while providing effective broadband attenuation.
Inlet Models
Absorptive inlet silencer designed for the broadband noise profile of rotary screw compressors. Low pressure drop design minimizes impact on compressor performance. Suitable for both oil-flooded and oil-free rotary screw compressors.
Combination reactive/absorptive inlet silencer for rotary screw compressors requiring higher attenuation. Addresses both the tonal lobe-pass frequency component and the broadband noise floor. Higher insertion loss than the absorptive-only UCI-S.
Discharge Models
Absorptive discharge silencer for rotary screw compressors. Provides broadband attenuation on the discharge side. Rated for the higher pressures typical of rotary screw compressor discharge service.
Combination reactive/absorptive discharge silencer for maximum insertion loss on rotary screw compressor discharge. Preferred where noise reduction requirements are stringent or where the compressor is located near occupied areas.
Centrifugal Compressor Silencers
Centrifugal compressors generate broadband aerodynamic noise and tonal components at the blade-pass frequency. Universal Silencer designs custom inlet and discharge silencers for centrifugal compressors used in pipeline, process, and power generation applications. Computer-enhanced acoustic analysis is used to optimize silencer performance for each application. Large pipe sizes and high-pressure ratings are available.
Custom-engineered absorptive inlet silencer for centrifugal compressors. Centrifugal compressors generate broadband aerodynamic noise and tonal components at the blade-pass frequency. Computer-enhanced acoustic analysis is used to optimize silencer performance for each specific compressor and application.
Custom-engineered absorptive discharge silencer for centrifugal compressors. High-pressure rated designs for pipeline and process service. Engineered to the specific compressor discharge conditions including pressure, temperature, gas composition, and flow rate.
Construction & Options
ASME Code Construction
Universal Silencer compressor silencers are available with ASME Section VIII Division 1 code construction and U-stamp for applications requiring pressure vessel certification. This is commonly required for high-pressure reciprocating compressor discharge silencers and for pipeline service. Specify ASME code construction when requesting a quote.
Typical Applications
- →Natural gas pipeline compressor stations
- →Gas gathering and processing facilities
- →Industrial air compressor systems
- →Refrigeration compressor systems
- →Chemical process compressors
- →Petrochemical plant compressors
- →Power plant air compressors
- →Offshore platform compressors
- →LNG and gas storage facilities
- →Industrial gas production
- →Pulp and paper mill compressors
- →Mining and quarry air systems
Sizing Inputs Required
Compressor type
Reciprocating, rotary screw, or centrifugal
RPM / cylinder or lobe count
Required for reactive chamber tuning on recip and screw
Flow rate
ACFM or SCFM — used to verify velocity through silencer
Suction / discharge pressures
PSIG — determines pressure rating required
Gas type and molecular weight
Affects acoustic velocity and silencer tuning
Operating temperature
°F — affects material and packing selection
Pipe size — inlet and discharge
Determines silencer connection size
Noise reduction target
dBA overall or by octave band
Material requirements
CS, SS, or alloy — based on gas and environment
Connection type and pressure class
ANSI 150# through 2500#
Sizing & Selection Assistance
Compressor silencer selection requires compressor type, RPM, cylinder or lobe count, flow rate, operating pressures, gas composition, pipe size, and noise reduction target. Contact Northeast Controls Inc. for application engineering and sizing assistance, or use our Universal Silencer quote form.
1-201-419-6111 · [email protected]
Request a QuoteRelated Products
Inlet and discharge silencers for positive displacement and centrifugal blowers.
Absorptive silencers for air, gas, and steam vent service.
Centrifugal and vane-type separators for liquid/gas separation.
Flow switches for compressor protection and process monitoring.
Quick RFQ
Request Pricing