Weekly Topic Phase 8: Dew point of compressed air
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Regarding the dew point issue of compressed air. Provided by Comrade Lao Huagong; we would like to express our gratitude to him for his active support in the development of this forum. We are always concerned with the dew point of compressed air. Let’s discuss the following points: 1. What is the dew point value of compressed air in your plant or company? 2. If compressed air is used for instruments, what dew point value is appropriate? 3. How can we reduce the dew point? 4. What factors can affect the dew point of compressed air? 5. Why do we sometimes increase the dew point? Please provide an example.
Well, there’s no compressed air in my company, so the key points seem to be: 1. The dew point of the compressed air should be below the minimum temperature at which the instruments can operate. 2. A temperature of minus 40 degrees. 3. Reducing the water vapor content in the compressed air. 4. The partial pressure of water vapor. 5. I don’t understand this.
The CA dew point is usually minus 40 degrees; if a higher value is required, it is minus 70 degrees. Reducing moisture can lower the dew point temperature; cold dryers are commonly used for cooling and dehumidification. Increases in dew point are relatively rare, such as through pressurization or raising temperature.
Plant: Cold rolling plant. 1. It depends; the quality of the compressed air supplied to our plant must meet the requirements specified in (GB/T 13277-1991). 2. The dew point should be at -20 degrees Celsius. 3. When the compressed air is used for instruments in our plant, the pressure should be between 0.4 and 0.6 Mpa. 4. To reduce humidity. 5. Well, some instruments may require higher-quality compressed air – not only should the dew point be low, but the oil content and solid particles in the air should also be at lower levels (2 or even lower). Otherwise, the accuracy and longevity of those instruments cannot be guaranteed. I hope this is helpful :p
1. Generally, it is -40 degrees； 2. This specification can be used for pneumatic valves in instruments, but of course the lower the value, the better. In winter, at such dew point levels, freezing often occurs in the northern regions due to cumulative effects; therefore, a buffer tank should be installed before each device, with water flowing at the bottom of it” ； 3. The air compressor is equipped with an integrated cold dryer that automatically switches to regeneration mode; however, the use of molecular sieves for dehydration can also be considered ； 4. Of course, it’s the water content ； 5. You’ll have to ask yourselves ；