When working with compressed air, air treatment is crucial to get the result you need. But what types of air filters are there? And how do they all work? Find out everything you need to to make your choice here.
A compressed air filter or air line filter is used to filter impurities from atmospheric air, like dust, oil and moisture, to make compressed air viable for use.
Just like air dryers, they are a crucial part of the air treatment process to make sure your compressed air is clean and safe to use, and to increase your equipment’s life span.
To make sure you pick the right type of compressed air filter, you first need to know what types of compressed air filters there are and what working principles they use. In this guide, you’ll find out what you need to know to choose the best compressed air filter for you.
Particulate air line filters remove dust and other harmful particles from compressed air. Like the membrane air dryer, the particulate filter uses a membrane that only lets air pass through and blocks other contaminants like dust, pollen and dirt.
Particulate air filters are often used after an adsorption dryer like a desiccant dryer. They also filter internal particulate matter like corrosion to help your air compressor live longer.
Benefits of a particulate filter
If you’re looking for a finer filter that removes fumes and vapours, the activated carbon filter is what you need, for moisture you are better off with a coalescent filter.
Activated carbon filters are often referred to as vapour removal filters, perfectly describing how carbon is used to attract gaseous contaminants and immobilise them. The carbon has a large surface area making it a durable type of filter.
As the filter becomes more saturated, however, the pressure will need to drop to reach the same quality of filtration. In order to maintain a reasonable amount of pressure, the carbon filter needs to be replaced every so often.
Activated carbon filters or vapour filters are mostly used for food processing and the production of breathable air.
Reasons to go for a vapour removal filte
Vapour filters are often followed by a particulate filter to catch possible carbon particles that break off into the air.
If you’re looking for a filter to take care of moisture, you are more likely to find what you need in a coalescing filter.
Coalescing air filters remove liquids like water, aerosols, lubricants and other oil particles from the air. They coalesce aerosols into droplets through pressure drops and the tortuous path working principle.
Because of this versatile way of working, coalescing air filters also catch particulates. They are caught along with the aerosol particles, drained and run through an oil-water separator to avoid pollution.
As with the carbon air filters, coalescing filters need regular replacing to avoid the pressure dropping too dramatically.
Coalescing air filters are incredibly versatile, though not very energy efficient.
Choosing the right compressed air filter is an important step when optimising your air treatment system. With these tips, you’re on your way to choosing the perfect compressed air filter.
Make sure to use both air dryers and air filters in your compressed air treatment. Though they both filter your compressed air, there are important differences between dryers and filters.
Still not sure what type of compressed air filter you need? Get in touch with the experts at Mark for personal advice.
In many applications, having dry compressed air is essential. It is paramount to make use of the right air drying system for your air compressor. In this article we’ll discuss how to find out which air drying system is ideal for your application, and how to set it up.