Other particles are also collected when air is gathered to be compressed which is contaminated. Contaminant concentration rises exponentially with compressed air. Additionally, when compressing air, additional impurities could be added. According to air compressor dealers in Ahmedabad, for the compressed air system to be free of impurities, air treatment is required. Air is seen as safe and clean when it has been adequately treated. However, the dryness of compressed air is just as important as its cleanliness in determining its quality. We must count the number of particles of a particular size present in one cubic metre of air, the dew point, and the quantity of oil aerosols and vapour in order to assess how clean and dry the compressed air is.
ISO air quality standard
The ISO 8573-1 international standard is designed to assess compressed air quality and was created by ISO. Three categories of contaminants found in compressed air are measured by the ISO air quality standard: solid particles, water, and oil content. It neglects gases and bacteria.
The number of impurities identified determines which compressed air class is awarded. The ISO 8573-1 is used to determine the air quality class. The specifications of this standardised system list compressed air sources in order of least to most contaminated. Regarding compressed air requirements, air compressors are categorised based on the purity class that remains after compression.
Need for purity of compressed air
Numerous industries, including mining, manufacturing, textile manufacture, and food processing, require compressed air from compressors made by oil free air compressor manufacturers in India. The work process, installed machinery, and product quality are all directly impacted by the quality of the air used in industrial applications. Therefore, it is essential that the compressed air be pure and devoid of impurities.
There is less chance of contamination, malfunctions, and rejection of goods in cleaner air. In sectors like food & beverage and pharmaceuticals, this is crucial. There is a possibility that the product or the packaging will come into direct or indirect contact with the air.
Working of air filters
Air particles and pollutants are separated using a filter. But since no filter is able to separate every particle, they are all only partially successful. The hardest particles to filter are those that are between 0.1 and 0.2 μm in size. When combined into an aerosol, water and oil behave like other particles and can be separated with a coalescing filter. These liquid droplets congregate in the filter and get heavier, which causes them to sink to the bottom.
Both liquid and aerosolized oil can be separated by the filter. On the other hand, there will be an oil carry-over and a large pressure decrease if the oil is liquid. It is more difficult to separate and needs a filter if the oil is vaporised
Every filtering process eventually causes a pressure drop, which wastes energy in the compressed air system. More impurities can be separated by finer filters with a tighter structure, but they also reduce pressure more quickly and clog more quickly. This results in increased maintenance expenses since filters need to be changed more frequently. Furthermore, filters need to have a bigger capacity threshold and be dimensioned appropriately to manage the nominal flow.
Working of air dryers
Compressed air is dried out using adsorption or refrigerant dryers. When the required maximum air quality is Class 4, which occurs when the dew point is 3°C or lower, refrigerant dryers are utilised. An adsorption dryer needs to be constructed if compressed air with less moisture that is, compressed air with a lower pressure dew point is needed.
