Compressed air quality classification
Compressed air guide
The European Committee of Compressed Air Equipment Manufacturers (PNEUROP) has developed an ISO standard for the classification of the content of solid particles, water and oil in compressed air.
Some applications require completely clean air . That is why FSO supplies clean and pure air without traces of oil, aerosols or other contaminants following the classification of the ISO 8573-1: 2010 standard.
Compressed air has its own set of ISO standards. Depending on the maximum purity of the air (determined by the number of particles per cubic meter depending on the size of the particles).
The International Organization for Standardization or Standardization, ISO (International Standards Organization) establishes global standards for commercial, industrial or professional purposes . The original version of the ISO compressed air purity standards (1991) was "made by and for" filter manufacturers. The standard defined five classes of oil concentration, the best of which was Class 1.
Technically oil-free air
- ISO Class 1 -
Class 1 specifies an oil concentration of less than 0.01 mg/m3 at 1 bar pressure and 20° C. Compliance with these criteria is sometimes called a "technically oil-free solution" . However, These standards were published in 2001 and updated in 2010 . The current standard establishes limits on total oil content (aerosol, liquid and vapor), and a specific standard on the measurement of oil vapor .
Oil free air
- ISO Class 0 -
In 2010 a new class (Class 0) was added to cover more stringent quality requirements. ISO Class 0 is the cleanest option and 100% oil-free air can be guaranteed. It is important not to confuse oil-lubricated compressors and "technically oil-free" filters with oil-free compressors. where the rotor element does not come into contact with lubricating oil, otherwise damage may be caused to the final product or compressed air network.
ISO 8573-1:2010 classifies air purity by taking into account its concentration of water, oil or gas particles and microbiological contaminants . Class 0 air is 100% oil-free, meaning the oil concentration in the air is less than 0.0 mg/m³.
Compressed air classes and categorization according to ISO 8573-1: 2010
- Class 0: As specified by the user or supplier of the equipment and more stringent than class 1.
- Class 1: < 0.01 mg/m3 total concentration of oil, aerosol, liquid or vapor.
- Class 2: < 0.1 mg/m3 total concentration of oil, aerosol, liquid or vapor.
- ...
| Quality grade | Solid particle content | water content | Content of oil |
||
|---|---|---|---|---|---|
| Max size mu | Max quantity mg/m³ | Dew point °C |
Quantity g/m³ | Max quantity mg/m³ | |
| 0 | As specified by the user or equipment supplier and more stringent than class 1 | ||||
| 1 | 0.1 | 0.1 | – 70 | 0.003 | 0.01 |
| 2 | 1 | 1 | – 40 | 0.11 | 0.1 |
| 3 | 5 | 5 | - twenty | 0.88 | 1 |
| 4 | 40 | 10 | 3 | 6 | 5 |
| 5 | – | – | 7 | 7.8 | 25 |
| 6 | – | – | 10 | 9.4 | – |
| Compressed air quality grade | |||||
What is the “dew point”?
Dew point: For a given pressure, the temperature at which water vapor begins to condense into liquid water.
Typical requirements for compressed air quality grades according to ISO 8573.1 for certain uses
| Application areas | Quality grade | ||||
|---|---|---|---|---|---|
| Particle content solid |
water content | Oil content | |||
| Air agitation | 3 | 6 | 3 | ||
| Large pneumatic motors | 4 | 5–2 | 5 | ||
| Pneumatic motors, miniatures | 3 | 4–2 | 3 | ||
| Wind turbines | 2 | 3 | 3 | ||
| Transport of granules | 3 | 5 | 3 | ||
| Powder transport | 2 | 4 | 2 | ||
| Fluidizers | 2 | 3–2 | 2 | ||
| Foundry machinery | 4 | 5 | 5 | ||
| Contact with food | 2 | 4 | 1 | ||
| Pneumatic, industrial tools | 4 | 6–5 | 4 | ||
| Mining machinery | 4 | 6 | 5 | ||
| Packing machines | 4 | 4 | 3 | ||
| Textile machinery | 4 | 4 | 3 | ||
| Pneumatic cylinders | 3 | 4 | 5 | ||
| Film manipulation | 1 | 2 | 1 | ||
| Precision regulators | 3 | 3 | 3 | ||
| Process instruments | 2 | 3 | 3 | ||
| Sandblast | - | 4 | 3 | ||
| Spray painting | 3 | 4–3 | 3 | ||
| Welding machines | 4 | 5 | 5 | ||
| General workshop air | 5 | 4 | 5 | ||
| Compressed air quality and application areas | |||||