Compressed air oil content ppm(Parts Per Million, parts per million) is a unit that represents the oil content in compressed air, which reflects the trace concentration of oil in compressed air. The following is a detailed explanation of the oil content of compressed air:
1. Definition and Understanding
- definition of ppm: ppm is a concentration unit that represents the concentration content in parts per million. In the field of compressed air, it is used to measure the presence of trace amounts of oil in the air.
- practical meaning under the conditions of atmospheric pressure 0.1MPa, atmospheric temperature 20 degrees Celsius and atmospheric relative humidity 65%, 1ppm is equivalent to 1.2 mg of oil per cubic meter of air. Note, however, that this conversion relationship may vary depending on specific conditions.
2. industry requirements
different industries have different requirements for the oil content of compressed air, but they are generally very strict, especially in areas that require extremely high cleanliness, such as semiconductor chip manufacturing.
- Semiconductor Industry: The total oil content in compressed air is usually required to be less than 1ppm, and even grade 0 oil-free compressed air is required in some high-end applications. Grade 0 oil-free here is not absolutely oil-free, but means that the oil content is less than a very low threshold, such as CLASS 0 in ISO 8573-1 Part 2 standard, I .e. the oil content is less than 0.01 mg/m & sup3;(Or converted to ppm unit is about 0.0083ppm, but it should be noted that this conversion is not completely accurate, because ppm and mg/m & sup3; Equivalence may vary under different conditions).
3. influencing factors and control measures
- influencing factors: The oil content of compressed air is affected by many factors, including the quality of the oil and gas separator, the blockage of the oil return pipe or the oil return check valve, the quality of the oil and the maintenance status of the air compressor system.
- Control measures: In order to ensure the low oil content of compressed air, a series of control measures should be taken, such as the selection of high-quality oil and gas separators, regular inspection and maintenance of oil return pipes and oil return check valves, the use of high-quality oil products and the strengthening of the overall maintenance of the air compressor system.
4. testing standards and methods
- test standard compressed air oil content testing standards usually vary according to different industries and applications, such as ISO 8573, ASTM D6786-02, etc.
- Detection method commonly used detection methods include gas chromatography, which can accurately determine the oil content in compressed air and provide an important basis for air quality control in the production process.
In summary, the oil content of compressed air is one of the important indicators to measure the quality of compressed air, especially for industries that require a high degree of cleanliness. By strictly controlling the oil content of compressed air and taking effective detection measures, the stability of the production process and the quality of the final product can be ensured.
