2026-04-14Views：
The dryness standard of compressed air mainly depends on its dew point temperature, that is, the amount of water content. The dew point temperature is the temperature at which the water vapor in the compressed air condenses into liquid water, and it is an important parameter to measure the drying degree of the compressed air. The following are compressed air dryness standards summarized according to the national standard GB/T 13277.1-2023 and industry practice:
according to the dew point temperature, compressed air is divided into six grades, from the driest grade 1 to the relatively humid grade 6:
| Grade | dew point temperature (℃) | equivalent to water vapor content (ppmv) |
|---|---|---|
| level 1 | ≤-70 | ≤ 2.598 |
| level 2 | ≤-40 | ≤ 127.34 |
| level 3 | ≤-20 | ≤ 1024.22 |
| level 4 | ≤ 3 | ≤ 7537 |
| level 5 | ≤ 7 | ≤ 9987 |
| level 6 | ≤ 10 | ≤ 12267 |
the dryness standard of compressed air is of great significance to industrial production. Compressed air that does not meet the dryness may cause equipment failure, product quality degradation and even production safety accidents. Therefore, enterprises should dry the compressed air in strict accordance with the relevant standards, and carry out regular inspection and maintenance.
In summary, the dryness standard of compressed air is divided according to the dew point temperature, and different application scenarios have different requirements for dryness. Enterprises should select suitable dryers according to actual needs and maintain them regularly to ensure that the dryness of compressed air meets the standard requirements.
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