The standard of compressed air for industrial use mainly relates to the content of solid particles, water vapor and oil in compressed air, as well as other related parameters such as gaseous and microbial requirements. The following is a specific summary of industrial compressed air standards:
1. solid content standard
the ISO 8573 standard classifies the solid particles in the compressed air according to the particle size, which is mainly divided into the following levels:
- grades 0 to 5: According to the particle diameter, it is divided into three intervals of 0.1μm<d≤ 0.5 μm, 0.5μm<d≤ 1.0 μm, and 1.0μm<d≤ 5μm, and further subdivided into multiple grades. Among them, level 0 is more stringent than level 1, and the user selects the judgment standard according to the specific needs. High-precision fields such as electronics and semiconductor industries usually adopt level 0 standards.
2. water vapor content standard
water vapor is one of the main pollutants in compressed air, and the ISO 8573 standard also clearly stipulates its content:
- level 0 to 6: expressed in dew point units, different dew point temperatures correspond to different applications. For example, level 1 is dew point -70 ℃, which is suitable for the electronics industry; level 2 dew point -40 ℃ is suitable for relatively dry occasions, such as the sterile pharmaceutical industry; level 3 is dew point -20 ℃, which can meet the requirements of ordinary food and drug production.
- Grade 7 to Grade 9 and Grade X: Use g/m & sup3; to indicate water vapor content.
Standard for 3. oil content
oil is another major pollutant in compressed air, and ISO 8573 also specifies its content in detail:
- the standard divides the oil content into 6 grades, namely grade 0 to grade 4 and grade X. Among them, grade 0 is the highest requirement, and the standard oil content of grade 1 shall not exceed 0.01 mg/m & sup3;; Grade 2 is suitable for general occasions, and the oil content shall not exceed 0.1 mg/m & sup3;.
4. other relevant parameter standards
in addition to the content of solid particles, water vapor and oil, ISO 8573 also specifies other parameters of compressed air, such as gaseous pollutants and microorganisms. The specific requirements of these parameters need to be controlled and monitored according to the specific application industry to ensure the stability and reliability of compressed air during use.
Matters needing attention in practical application of 5.
- Pressure requirements pressure requirements for industrial compressed air vary by industry and application. Generally speaking, the compressed air value commonly used in factories is usually 0.7-1.0Mpa, but there are also special occasions that require higher pressure.
- Requirements for dryness: Dryness refers to the water content or dew point temperature of compressed air. Different processes have different requirements for the dew point temperature of compressed air. For example, the pressure dew point of compressed air used as an instrument is generally required to be below -40 ℃, while higher dew point temperature may be required in the manufacture of some precision instruments.
- Equipment selection and maintenance: According to the different quality of compressed air required, it is necessary to select appropriate processing equipment and dryers, and strengthen the maintenance and maintenance of the equipment to ensure the quality and stability of the compressed air.
In summary, the standard of industrial compressed air involves many aspects, including solid particles, water vapor, oil content and other related parameters. In practical applications, it is necessary to select appropriate standards according to specific needs and carry out corresponding control and monitoring.
