What are industrial compressed air standards?

Compressed air standards for industrial use focus on its cleanliness, dryness, pressure stability and other core indicators, these standards are designed to ensure the safety, stability and product quality of compressed air in various industrial applications. The following is a detailed description of four aspects: quality indicators, industry applications, testing methods and safeguards:

1. core quality indicators

1. dust content (particulate matter content)
   • standard requirements: According to the application scenario, the dust content needs to be controlled within different ranges. General industrial scenarios (such as pneumatic tools, automated production lines) usually require dust content ≤ 5 mg/m3; and in the field of precision manufacturing (such as electronics, semiconductors, precision machinery), the dust content needs to be strictly controlled at ≤ 1 micron to avoid particulate matter pollution or damage to the product.
   • Detection method: Using a laser particle counter or weighing method, the dust content is evaluated by measuring the concentration or weight of particulate matter in compressed air.
2. Oil content
   • standard requirements: Oil content is an important indicator to measure the purity of compressed air. Ordinary industrial scenarios allow oil content ≤ 10 mg/m3, but in high-demand industries such as precision manufacturing, food and medicine, oil content needs to be controlled at a lower level. For example, industries such as electronics and medical equipment manufacturing require oil content ≤ 0.01 mg/m3, while the pharmaceutical industry requires oil content ≤ 0.1 mg/m3.
   • Detection method: Detect the oil content in compressed air by infrared spectroscopy or chemical titration to ensure that it meets the standard.
3. Water content (pressure dew point)
   • standard requirements: The water content is expressed as the pressure dew point, that is, the temperature at which compressed air is cooled to saturation at a specific pressure. Common industrial scenarios usually require pressure dew point ≤-20 ℃; in food processing, coating and other moisture-sensitive industries, the pressure dew point needs to be ≤-40 ℃; and in extreme cases (such as cold areas or high-precision processes), The pressure dew point even needs to be as low as -70 ℃ to prevent moisture condensation from affecting product quality or equipment performance.
   • Detection method: Use a dew point meter or humidity sensor to monitor the moisture content in the compressed air in real time to ensure that it meets the standard.

2. industry application differences

different industries have different requirements for compressed air quality, which are mainly reflected in the following aspects:

1. general industry
   • application Scenarios pneumatic tools, automated production lines, general machining, etc.
   • Standard requirements: Dust content ≤ 5 mg/m3, oil content ≤ 10 mg/m3, pressure dew point ≤-20 ℃.
2. Precision Manufacturing
   • application Scenarios electronics, semiconductors, precision machinery, optical instruments, etc.
   • Standard requirements: Dust content ≤ 1 micron, oil content ≤ 0.01 mg/m3, pressure dew point ≤-40 ℃, to ensure high precision and high quality of the product.
3. Food and Medicine
   • application Scenarios: Food processing, pharmaceutical, medical equipment manufacturing, etc.
   • Standard requirements: dust content ≤ 1 micron, oil content ≤ 0.1 mg/m3 (pharmaceutical industry), pressure dew point ≤-70 ℃, and need to detect microbial content (≤ 100CFU/m3) to ensure product safety and sterility.

3. detection and safeguard measures

in order to ensure that the quality of compressed air meets the standard, the following inspection and safeguard measures shall be taken:

1. detection method
   • dust content detection: Use laser particle counter or light scattering method to measure the concentration of particulate matter in compressed air.
   • Oil content detection: Detect the oil content in compressed air by infrared spectroscopy or chemical titration.
   • Water content detection: Use dew point meter or humidity sensor to monitor the moisture content in compressed air in real time.
   • Microbiological detection detection of microbial content in compressed air by culture method, microscope observation method or molecular biology method.
2. Safeguards
   • air Compressor Selection: Select the appropriate air compressor type according to the air demand, such as oil-free air compressor for high air quality requirements of the scene.
   • Post-processing equipment configuration: Equipped with air storage tanks, filters, dryers and other post-processing equipment to remove impurities, oil and moisture in the compressed air and ensure air quality.
   • Regular maintenance and maintenance regularly replace the filter element, clean the oil barrel, and check the operating status of the air compressor and post-processing equipment to ensure its normal operation and stable air quality.

Comparison of 4. Standards at Home and Abroad

1. domestic Standards
   • GB/T 13277.1-2023 this standard specifies the purification level and measurement method of particulate matter, moisture, grease and other pollutants in compressed air, and is applicable to the control requirements of compressed air quality in various industries.
   • Drug Administration Law and its Implementing Regulations although these regulations have general provisions on the application of compressed air in the pharmaceutical industry, there are no specific pharmaceutical grade compressed air quality standards, which need to refer to relevant industry standards or enterprise standards.
2. International Standards
   • ISO 8573-1 the standard defines the compressed air quality level, including particulate matter, moisture, oil and other indicators, for the international general compressed air quality standards.
   • European standard DIN EN 12021 this standard applies to compressed air for respiratory protection devices, and specifies its quality requirements and testing methods, with special attention to the control of oxygen content, carbon dioxide content and carbon monoxide and other harmful gases in compressed air.

Through the application of the above measures and standards, it can be ensured that the quality of industrial compressed air meets the needs of various application scenarios, and the stability of the production process and the quality of products can be guaranteed.