There is a common idea that diesel generators are noisy. It cannot be denied that diesel gensets produce more noise than other kinds of power generators, which could be a nuisance for residents around. Luckily, there are many ways to make the generators quieter. An exhaust silencer can effectively reduce noise and exhaust emissions produced during combustion. Read on and learn about different types of diesel generator exhaust silencers and the silencer sound ratings.

 

What is a diesel generator exhaust silencer?

 

A diesel generator exhaust silencer is a device for reducing diesel engine noise emission. It is inevitable that all internal combustion engines produce noise, more or less. The noise level will largely vary depending on diesel engine type. Diesel generators are powered by a diesel engine, which is an internal combustion engine that runs on diesel fuel. The operation of an internal combustion engine produces distinct pulses of exhaust gas that exit through the exhaust pipes and the muffler. Sound is a pressure wave formed from pulses of alternating high and low pressure air. Exhaust silencers are installed within the exhaust system of diesel engines. They allow the passage of exhaust gasses while restricting the transmission of sound.

 

What are the types of diesel generator exhaust silencers?

 

Diesel generator exhaust silencers come in different designs that vary depending on their size and shape, the way they work and a few other features. Commonly, the silencers are in cylinder, disc, and rectangle shapes, with inlets and outlets able to be located on both sides, both ends or one side and one end to work with your system. The three basic types are:

 

Reactive silencer

 

The internal construction consists of a maximum of three chambers connected by a tube. The exhaust noise created bounces between different chambers and reactive silencers mute sound by bouncing it around inside one or multiple chambers. This type of generator silencer is commonly used for low to mid-level noise reduction.

 

Absorptive silencers

 

The internal construction consists of fiberglass or E glass insulation. The exhaust noise is reduced as it flows through the insulation. This type of generator silencer has a greater sound attenuation rating and is typically used to reduce high frequency sound waves.

 

Combination silencers

 

As the name implies, this type of silencer combines the construction of the reactive and absorptive silencers. Combination silencers are typically made from a metal chamber with absorption material fitted inside. They can be used to reduce mid, low and high-frequency sounds.

 

The three basic designs mentioned above offer several different generator silencers that you can choose to meet your requirements. Which type of diesel generator exhaust silencer is right for you? It will depend on the model of your generator and the level of noise reduction you require. The following options are the type of silencers you can choose from:

 

Cylindrical silencers

 

Cylindrical silencers can be mounted horizontally or vertically, making them a great option for  generators of various different models. They are the most common used type of silencers and can be utilized in both inside and outside applications. Additionally, these silencers are relatively affordable and especially suitable for budget-minded shoppers.

 

Low-profile silencers

 

Low-profile silencers are available in various shapes such as rectangular, oval, and round. They  typically have a higher sound reduction rating than other types and commonly used in diesel generators located in sound attenuated enclosures. Please note that these silencers must meet the National Fire Protection Association (NFPA) guidelines. The downside of low-profile silencers is that they are more expensive compared to other options and may require more frequent maintenance.

 

Emission control silencers

 

Emission control silencers work by reducing the amount of noise generated by the engine. They absorb the noise and then redirect it away from the engine. Certain models of these silencers come with the ability to control the vibrations as well. The Environmental Protection Agency (EPA) regulates emissions for generators that supply main power to a facility. Emission control silencers can help filter emissions for better environmental control and to stay in compliance with local or EPA regulations. They are typically used in industrial settings where noise emissions need controlling.

 

Sound attenuation silencers

 

Sound attenuation silencers are specially designed to reduce the overall noise created by the diesel generator engine. These silencers absorb and dissipate the noise before it has a chance to reach the outside world. Diesel generators used in residential areas usually come in this type of silencer.

 

Hybrid silencers

 

Hybrid silencers combine both emission control and sound attenuation into one unit. These silencers are commonly used in places where both emission and noise reduction are strict requirements.

 

Get a silent diesel generator today

 

If you are looking for a generator with exhaust silencer or other acoustic dampening devices, contact Dingbo Power today. We are a professional manufacture of diesel generator sets with almost 20 years experience in the industry. We offer a variety of silent type diesel gensets that can meet your needs. Feel free to contact us with any questions, concerns, or inquiries to learn more about the products & services we provide.