BS EN 12021 “Respiratory protective
Devices - Compressed air for breathing apparatus” specifies requirements for the quality of compressed air supplied for use with:
For breathing air devices, the quality of the air should be tested at least once every 3 months. Testing criteria listed below:
BS EN 12021 Requirements |
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Oxygen |
The oxygen content shall be in the range of (21 ± 1) % by volume (dry air). |
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Lubricant |
Lubricant content (droplets or mist) shall not exceed 0.5 mg/m3. |
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Odour and taste |
The air shall be without significant odour or taste. |
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CO2 |
The carbon dioxide content shall not exceed 500 ml/m3 (500 ppm). |
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CO |
The carbon monoxide content shall be as low as possible but not exceed 15 ml/m3 (15 ppm). |
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Water Content |
There shall be no free liquid water. |
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Air for compressed air line breathing apparatus shall have a dewpoint sufficiently low to prevent condensation and freezing. Where the apparatus is used and stored at a known temperature the pressure dewpoint shall be at least 5˚C below the likely lowest temperature. Where the conditions of usage and storage of the compressed air supply is not known the pressure dewpoint shall not exceed -11˚C. |
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Max water content of air at |
Nominal pressure bar |
Maximum water content of air at atmospheric pressure mg/m3 |
40 to 200 |
50 |
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> 200 |
35 |
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NOTE The water content of the air supplied by the compressor for filling 200 bar or 300 bar cylinders should not exceed 25 mg/m3. |
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