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Air Treatment Equipment for Oil-Injected Compressors

We carry a complete line of air treatment equipment to match our Compressors fleet and your needs.

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How to choose an Inline Filter for your compressed air system?

Picking out an inline filter is not an art, but it could be confusing if we do not ask the right questions or understand the process that requires filtration. Before we move any further, let’s take a step back and get a general idea of filtration and why it plays an important role within the compressed air system.    

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Why do you need a filter?

When you have a taste for coffee, it is simple to go to your nearest coffee bar or use a popular ‘cup’ machine, but we want more. The example I’d like to use consists of using the drip coffeemaker and roasted beans. One of the most important items in making a good cup of coffee in such a machine is to use a proper filter in order to avoid a cup full of grainy particles and any other remaining pieces of the coffee bean. As insignificant as it might seem, the paper filter plays a vital role in making coffee that you can enjoy.

Although, a different entity than a coffeemaker, your compressed air system needs a filter as well. Compressed air is full of particles, aerosols, and oil vapors (in oil-injected pistons and screws) that contaminate the compressed air and can cause potential harm to its end users (equipment that uses compressed air). Incorporating the correct inline filter can help you eliminate unwanted particulates as well as aerosols and vapors. The number of filters and types needed will be dependent on the quality of the air your application and or process requires. Let’s take a look at the different types of filters and the questions that will help you choose the correct filter.          

How clean does my air need to be?

In order to understand how clean your air needs to be, you have to identify and assess the application and process that utilizes compressed air. Not all applications and processes that use compressed air require the same level of filtration, which is why having this information, is the first step in choosing the correct filter. Compressed air utilized for pneumatic purposes can oftentimes be supported by a standard dry particulate filter that provides filtration down to 1 or 0.01 micron, however, if your process requires an OSHA approval and elimination of oil vapors, then a charcoal activated filter will have to be utilized. Let us get a better understanding of what contaminants are and how they affect compressed air systems. Contaminants within a compressed air system can originate from ambient air that is utilized, as well as the system (compressor) itself. There are three main contaminants that are found in compressed air: particulates, aerosols, and vapors.      


Particulates in a compressed air system are small pieces of solid material such as dust, dirt, and or pollen from the ambient air, as well as loose metal particles that can be caused by pipe corrosion. Depending on the sensitivity of your application and or process, contact with particles can be damaging to the end product, therefore causing delays in production and quality control issues, not to mention potentially unsatisfied customers.
Aerosols consist of small droplets of liquid that can be found within compressed air system, especially in those using oil-injected compressors. Aerosols are created from the lubricant, in this case, the oil used in the compressor and can be harmful to both products and people if not treated properly.
In the compressed air system, vapors consist of lubricants as well as any other liquid that has converted to a gas. Such vapors require a special carbon activated filter in order to be removed from the system.

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Oil Injected Air Treatment Experts

South Africa & Sub-Sahara Africa