What is the general purity requirement for compressed air
The purity requirements of compressed air vary according to the application field and specific requirements. Generally speaking, the purity requirements of compressed air mainly include three major indicators: particle size (cleanness), moisture (dew point) and oil steam (residual oil content). The following are detailed explanations and general requirements for these indicators: 1. Particle size (cleanness)
Particle size is an indicator to measure the content of solid particles in compressed air. Different levels of compressed air have different requirements for particle size. Generally speaking, in industrial applications, the requirements for particle size may be relatively low; while in some high-precision application occasions, such as electronics, semiconductors, medicine and other fields, the requirements for particle size are very high. Specific values may depend on actual requirements. For example, some high-precision applications may require a particle size less than 0.1 micron.
2. Moisture (dew point)
Moisture is an indicator to measure the water vapor content in compressed air, which is usually expressed by dew point. The lower the dew point, the less water vapor content in the compressed air and the higher the degree of drying of the air. Different industries also have different requirements for dew point. For example, in some situations where dry air is required, such as painting, plastic processing, medical gases, etc., the dew point requirement may be lower than -40°C or even lower; in some situations where humidity requirements are not high, the dew point requirement may be relatively high.
3. Oil steam (residual oil content)
Oil steam is an indicator to measure the oil content in compressed air. The presence of oil steam may have adverse effects on certain applications, such as contaminating products and affecting the normal operation of equipment. Therefore, many industries have strict requirements on the residual oil content in compressed air. Generally speaking, in industrial applications, the requirements for residual oil content may be relatively low; while in some high-precision application occasions, such as electronics, semiconductors, medicines and other fields, the requirements for residual oil content are very high. Specific values may depend on actual needs. For example, some high-precision applications may require residual oil content to be less than 0.01 mg/Nm³.
4. General requirements overview
For most industrial applications, the purity requirements of compressed air may be relatively low, but certain standards still need to be met to ensure the smooth progress of production. For example, in some general industrial applications, the particle size may be required to be less than 1 micron, dew point below -20°C, and residual oil content below 0.1 mg/Nm³. However, in some high-precision application scenarios, such as electronics, semiconductors, medicine and other fields, the purity requirements for compressed air are very high and stricter indicators may be required.
5. Standards to follow
The current compressed air purity level in my country is in compliance with ISO 8573-1 standard. This standard specifies the content levels of solid particles, water (liquids and steam) and oil (suspensions and steam) in compressed air. According to this standard, the purity level of compressed air can be divided into 1 to 4 levels, each level corresponding to different pollutant content and particlesThe maximum value of the size.
In general, the purity requirements of compressed air vary according to the application field and specific requirements. In practical applications, it is necessary to select a suitable compressed air purity level according to actual needs and take corresponding measures to ensure that the purity of compressed air meets the requirements.
