Keep It Down – Air Compressor Noise Reduction

It’s no secret – air compressors are excellent sources of energy. Not only do they power essential manufacturing elements and applications, but the heat generated as a result of the compressed air processes can be used as a byproduct that offsets other energy costs.

However, there’s another form of energy that is also a consequence of the air compression process – sound.

The sound we hear and the level at which we hear it is dependent on proximity to the source, as well as other variables in the particular environment. When indoors, these variables can include the size of the room, the contents of the room, and, in conjunction with various surfaces in the room, their ability to absorb or reflect sound. When sound waves come in contact with a surface, a portion of the waves are absorbed into that surface, while a remaining portion is deflected back. How effective a surface can absorb that sound is dependent on the material of which it is made – for example, think about how sound differs in a room with carpeting versus a room with tile or hardwood floors!

The Benefits of Reducing a Compressor’s Sound Level

Do you know the sound levels for various sounds that you hear on a daily basis? Sound levels are measured in units called decibels and is expressed as dB. Here are some common noises we hear daily and the typical associated decibel levels:

Leaves rustling – 30 dB

Normal conversation – 60 dB

Vacuum cleaner – 75 dB

ATV or motorcycle – 100 dB

Chainsaw – 115 dB

Crowd noise at a sporting event – 125 dB

Gun shot, fired at 100 feet – 140 dB

Compressor sound levels can range from 40-92 dB, with any noise higher than 85 dB being considered harmful with prolonged exposure. This means that reducing sound from air compressors and compressed air systems not only makes for a more pleasant and enjoyable workplace, but it is also healthier and safer for workers!

How Do I Reduce the Noise Level of My Compressor Installation?

The size of a compressor room, the compressors positioning within the room, and the associated materials of which the room is constructed are all important variables in determining and producing (and reducing) compressor noise. Vibration transfer through the compressed air piping system can also impact the transfer of sound throughout a facility. That’s why it’s important to fit a compressor and piping system with the appropriate vibration and sound insulators, or even enclose piping sections within a sound absorbing material, to help keep noise to a minimum. Many stationary air compressors also come equipped with integrated sound-reduction devices.

In addition to these items, here are four other effective means of reducing noise and making the workplace safer and more enjoyable:

Sound Insulation. This involves placing an acoustic barrier between the sound source and the receiver. This means that only part of the sound can be insulated, depending on the barrier and its individual characteristics. A larger, heavier barrier will obviously be more effective than a smaller one.

Sound Absorption. By surrounding the sound source with porous absorbents attached to a barrier, there is an added level of sound reduction beyond that offered by insulation alone; think open cell polyurethane foam or heavier cloth applications.

Vibration Insulation. By preventing the transfer from vibrations from one part of a structure to another, you can by association reduce the sound levels as well. One common area of vibration transfer is from a large piece of machinery through the floor. Steel springs, cork, plastic, and rubber are materials that are all effective means of reducing this transfer and any associated noise. The choice of material depends on the dimensions of the machine and surrounding space, as well as the stability demands of the machine. You should also keep in mind that if the compressor is installed in a location that has it coming into contact with another object, the noise generated by this contact can easily multiply.

Vibration Dampening. Fitting a structure with an external dampening surface composed of an elastic material is an effective means of reducing the machine’s vibrations (and sound). The thinker the dampening barrier, the more effective its means of reducing vibrations. This may prove to be the most cost-effective solutions, while conversely producing the most limited results.

Is your compressed air system is too loud? It’s time to reach out to the team at Ash Air to find ways to make the work environment more pleasant for your workers!

Do you have an idea for our #expertcorner? Let us know!

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Who we are and how Ash Air can help your business!

Ash Air has been around in New Zealand since 1979, and we’ve grown into a nationwide company with international support and a reputation for quality and reliability.We look after all things compressed air for your business!

  • Reciprocating, Screw, air compressors
  • Vacuum pumps
  • Nitrogen
  • An extensive line of air treatment components

Ash Air's range of Chicago Pneumatic, Alup, Pneumatech, and Quincy compressors are used extensively around the world in industries ranging from oil and gas to food, automotive and farming, and we bring you these world class compressors here in the land of the long white cloud.Our technicians are compressed air equipment experts and are dedicated to addressing customer needs. Supported by a 13 locations nationwide, Ash Air offers one of the widest selections of compressed air equipment and parts available today in New Zealand.

Reliability and Efficiency

With Ash Air compressors, you can count on reliability and high performance for even the most demanding applications. We focus our efforts on the following:

  • Increasing uptime
  • Reducing unexpected repairs
  • Reducing energy consumption
  • Improving the cleanliness of compressed air


Talk to the team today:  CONTACT US CONTACT US

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In the world of compressors, there are often significant and unutilized energy-saving possibilities including energy recovery, pressure reduction, leakage reduction and optimization of operations through correct choice of a control and regulation system as well as the choice of compressor size.We are going to take a look at some of the opportunities for minimizing the compressor’s operating costs.  …


Liquid water in compressed-air systems can lead to rusted equipment and unresponsive controls. Anyone who uses compressed air will, at some point, find liquid water in the air distribution system. This can be anything from a nuisance to a serious problem, depending on the application. If water might corrode equipment or introduce bacteria, removing it is critical.  …


Liquid water in compressed-air systems can lead to rusted equipment and unresponsive controls. Anyone who uses compressed air will, at some point, find liquid water in the air distribution system. This can be anything from a nuisance to a serious problem, depending on the application. If water might corrode equipment or introduce bacteria, removing it is critical.  …


Whenever most people think about a compressor, they probably have a piston compressor in mind. You might already know there are two basic principles of air compression. One of those is the principle of displacement compression. There are a lot of compressor types that classify as a displacement compressor. The piston compressor is one of them, oil-lubricated or oil-free.  …


Once you have the size and type of compressor figured out, one last question remains, should I go with an oil lubricated or oil-free air compressor. To not overcomplicate the answer, your choice should be based on the application and process that the compressed air will be utilized in. …


Like all compressor types, rotary screw models do require periodic maintenance. Thanks to the simplicity of the internal components, maintenance is relatively easy on most rotary air compressors. As long as you stick to a rotary screw compressor maintenance schedule, you will likely be rewarded with many, many years of optimal productivity from your machine.  …


Did you know, the biggest part of the air we breathe is nitrogen? Everyone needs oxygen to survive, however air is made up of 78% nitrogen, only 21% oxygen and tiny amounts of other gases. Although, the human body does not use this nitrogen, it is very helpful in various industrial applications. There is an unlimited source of nitrogen readily available, allowing you to achieve needed purity at a fraction of your current annual nitrogen cost.  …

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