Silencers

Photo of a Nett Technologies' SilencerNett Technologies Inc. provides a broad range of noise reduction solutions ranging from 1” to 60” silencer inlets serving the following industries:

  1. Power Generation
  2. Industrial OEM
  3. Process Industries
  4. Hospital & Health Care
  5. Bulk and Paper
  6. Marine
  7. Locomotion
  8. Military
  9. Pneumatic Conveying
  10. Vacuum Silencers
  11. Commercial & High Rise

By supplying myriads of cost-effective compact and low-pressure drop silencers, Nett Technologies Inc is leading the way through innovations, technologies, design engineering, optimizations, customer service and lead-time in engine exhaust silencer primarily for the industrial and power generation market including but not limited to Kohler, Caterpillar, MTU, Cummins, John Deere, Perkins and Doosan Engines.

Core Competencies

We particularly focus on three core business areas:

  1. Application Engineering: Designing the most cost-effective sound solution for given applications
  2. Virtual Testing: Leveraging advanced sound modeling software to assess and recommend the best noise solutions
  3. Engine Testing: Using state of an art testing facility we can test and validate any noise control requirements

Silencers - Types

Nett standard line of products includes three common types of silencers that are use on stationary reciprocating internal combustion engines:

  1. Reactive (reflective) silencers – These silencers reflect the sound waves toward the source. The sound energy is dissipated in the extended flow path resulting from the internal reflection, and by absorption at the source.
  2. Absorptive (dissipative) silencers – These silencers utilized an acoustic sound absorbing material to attenuate the sound waves. The sound energy is partially converted into a small amount of heat by motion in the fiber of the absorbing material during its passage through the material.
  3. Combination type (reactive and absorptive) – These silencers are designed in such a way that a selective portion of the silencer is reflective and the other portion is dissipative.

Besides the above, Nett Technologies serves the industry through its custom design solutions to save time, fuel, cost, and more importantly foot-print through its compact line of products.

How to select the right silencer

The proper selection of a silencer is performed by matching the attenuation characteristics of the silencer to the noise characteristics of the noise source, while still achieving the allowable silencer power consumption caused by the silencer pressure drop. There are five (5) considerations when selecting the right silencer for your project i) performance, ii) aesthetic, iii) size and weight, iv) workmanship and v) cost-effectiveness. Please contact Nett Technologies Inc to help you select the right silencer for your application.

Silencers - Performance

Grade of Silencer

The stationary reciprocating internal combustion engine application there are various grade (model) of silencers designated by the engine silencer manufactures. However, the common engine exhaust silencers are Industrial, Residential, Critical and Hospital grades.

Basic performance of a silencer

Each grade of silencers is designed with a range of insertion loss - IL (dBA) – the level of sound reduction after the silencer is attached to the noise source (engine).

Industrial Grade – IL =15 – 25 dBA

Residential Grade – IL =25 – 30 dBA

Critical – IL =30 – 35 dBA

Hospital Grade – IL =35 – 40 dBA

Silencers - Designs & Options

Materials of a Silencer

Silencers are made from mild steel, aluminized steel or stainless steel. While carbon steel materials are widely used in the power generation market, more and more facilities are using aluminized steel for the body of the silencer due to its advantageous properties of the material composition. In a corrosive environment, a stainless steel material is the material of choice.

Silencer Configurations

Silencers are available in three body styles:

  • Cylindrical
  • Disc (Hockey Puck)
  • Rectangular

Cylindrical silencers are the usual choice for most applications. For limited space designs which don't compromise performance, choose disc or rectangular configurations.

The silencer inlet/outlet diameters as well as their locations, can be customized to the application. Virtually all other dimensions, material and paint color can be customized upon request.

Silencers - Accessories

A full range of accessories are available in a range of sizes, material and paint color.

Flexible Connectors

Flexible Exhaust Connectors are recommended for installation between the engine and the silencer to decrease and isolate vibration and movement from the engine.

Expansion Bellows

Exhaust Expansion Bellows are multi-ply stainless steel with 1.5” to 3” axial deflection; they are installed along the engine exhaust line for thermal expansion and movement from the engine exhaust heat.

Elbow Joints

Exhaust Elbows come in LR/SR 90 degrees and LR/SR 45 degrees. Connection sizes are variable and custom.

Mounting Bands

Mounting Bands for silencer platform mount installations. Innovative design makes installations flexible and easy.

Hanging Bands

Hanging Bands for silencer ceiling mount installations. Innovative design makes installations flexible and easy.

Flange Kits

Flange Kits complete with loose flanges, high temperature gasket, nuts and bolts in one package.

Hardware Kits

Hardware Kits complete with high temperature gasket, nuts and bolts in one package.

Wall Thimble Kits

Wall Thimble Kits are used when exhaust piping passes through a wall structure and to prevent transmission of heat to combustible materials - NFPA 37 rated.

Roof Thimble Kits

Roof Thimble Kits are used when exhaust piping passes through a roof structure and to prevent transmission of heat to combustible materials - NFPA 37 rated.

Rain Caps

Rain Caps prevent rain, snow, debris and animals from entering the exhaust system and causing extensive damage.

 

Silencers - Types

Nett standard line of products includes three common types of silencers that are use on stationary reciprocating internal combustion engines:

  1. Reactive (reflective) silencers – These silencers reflect the sound waves toward the source. The sound energy is dissipated in the extended flow path resulting from the internal reflection, and by absorption at the source.
  2. Absorptive (dissipative) silencers – These silencers utilized an acoustic sound absorbing material to attenuate the sound waves. The sound energy is partially converted into a small amount of heat by motion in the fiber of the absorbing material during its passage through the material.
  3. Combination type (reactive and absorptive) – These silencers are designed in such a way that a selective portion of the silencer is reflective and the other portion is dissipative.

Besides the above, Nett Technologies serves the industry through its custom design solutions to save time, fuel, cost, and more importantly foot-print through its compact line of products.

How to select the right silencer

The proper selection of a silencer is performed by matching the attenuation characteristics of the silencer to the noise characteristics of the noise source, while still achieving the allowable silencer power consumption caused by the silencer pressure drop. There are five (5) considerations when selecting the right silencer for your project i) performance, ii) aesthetic, iii) size and weight, iv) workmanship and v) cost-effectiveness. Please contact Nett Technologies Inc to help you select the right silencer for your application.

Silencers - Performance

Grade of Silencer

The stationary reciprocating internal combustion engine application there are various grade (model) of silencers designated by the engine silencer manufactures. However, the common engine exhaust silencers are Industrial, Residential, Critical and Hospital grades.

Basic performance of a silencer

Each grade of silencers is designed with a range of insertion loss - IL (dBA) – the level of sound reduction after the silencer is attached to the noise source (engine).

Industrial Grade – IL =15 – 25 dBA

Residential Grade – IL =25 – 30 dBA

Critical – IL =30 – 35 dBA

Hospital Grade – IL =35 – 40 dBA

Silencers - Designs & Options

Materials of a Silencer

Silencers are made from mild steel, aluminized steel or stainless steel. While carbon steel materials are widely used in the power generation market, more and more facilities are using aluminized steel for the body of the silencer due to its advantageous properties of the material composition. In a corrosive environment, a stainless steel material is the material of choice.

Silencer Configurations

Silencers are available in three body styles:

  • Cylindrical
  • Disc (Hockey Puck)
  • Rectangular

Cylindrical silencers are the usual choice for most applications. For limited space designs which don't compromise performance, choose disc or rectangular configurations.

The silencer inlet/outlet diameters as well as their locations, can be customized to the application. Virtually all other dimensions, material and paint color can be customized upon request.

Silencers - Accessories

A full range of accessories are available in a range of sizes, material and paint color.

Flexible Connectors

Flexible Exhaust Connectors are recommended for installation between the engine and the silencer to decrease and isolate vibration and movement from the engine.

Expansion Bellows

Exhaust Expansion Bellows are multi-ply stainless steel with 1.5” to 3” axial deflection; they are installed along the engine exhaust line for thermal expansion and movement from the engine exhaust heat.

Elbow Joints

Exhaust Elbows come in LR/SR 90 degrees and LR/SR 45 degrees. Connection sizes are variable and custom.

Mounting Bands

Mounting Bands for silencer platform mount installations. Innovative design makes installations flexible and easy.

Hanging Bands

Hanging Bands for silencer ceiling mount installations. Innovative design makes installations flexible and easy.

Flange Kits

Flange Kits complete with loose flanges, high temperature gasket, nuts and bolts in one package.

Hardware Kits

Hardware Kits complete with high temperature gasket, nuts and bolts in one package.

Wall Thimble Kits

Wall Thimble Kits are used when exhaust piping passes through a wall structure and to prevent transmission of heat to combustible materials - NFPA 37 rated.

Roof Thimble Kits

Roof Thimble Kits are used when exhaust piping passes through a roof structure and to prevent transmission of heat to combustible materials - NFPA 37 rated.

Rain Caps

Rain Caps prevent rain, snow, debris and animals from entering the exhaust system and causing extensive damage.

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