Quality Requirements of Compressed Air in Different Industries

The quality requirements of compressed air in different industries vary significantly depending on the application scenario and safety standards. Cleanliness, dryness, oil content, microbial control, gas composition stability and other core indicators. The following are specific industry requirements and analysis:

1. food processing industry: health and safety as the core

1. core Requirements
   • no pollution: Compressed air shall not contain oil, water, dust, microorganisms and other pollutants to prevent direct contact with food caused by pollution.
   • Non-toxic do not contain toxic substances to ensure the health and safety of consumers.
   • Compliance with regulations: It shall meet international food safety regulations such as FDA (United States) and EFSA (Europe), and ISO 8573-1:2010 standard (Class 1.2.1 or higher is usually required, I .e. solid particles ≤ 0.1 μm, moisture pressure dew point ≤-40 ℃, oil content ≤ 0.01 mg/m & sup3;).
2. Typical application scenarios
   • raw material pneumatic conveying, cutting, canning, purging, molding and other links.
   • Fermentation and agitation (sterile treatment required, such as HEPA filtration + UV sterilization).
   • Packing and filling (using independent circuit, pressure dew point ≤-40 ℃).
3. Control measures
   • oil-free screw machine or vortex machine, equipped with multi-stage filtration (pre-filtration, precision filtration, sterilization filtration) and adsorption dryer.
   • Regularly detect oil, moisture, particulate matter and microorganisms (bacteria count ≤ 100 CFU/m & sup3;) and keep records to meet HACCP or ISO 22000 traceability requirements.

2. Pharmaceutical Industry: Both Cleanliness and Sterility

1. core Requirements
   • GMP specification: Compressed air shall comply with ISO 8573-1 Class 1 cleanliness (0.1-0.5μm particles ≤ 20000/m & sup3;, oil content ≤ 0.01 mg/m & sup3;, pressure dew point ≤-70 ℃).
   • Sterility requirements: The production area in direct contact with drugs shall meet the standard of Class A clean area, and the microbiological index shall refer to the standard of water for injection (total bacteria ≤ 1 CFU/m & sup3;).
2. Typical application scenarios
   • pharmaceutical packaging, pneumatic conveying, drying, mixing and other links.
   • Production of sterile pharmaceutical products (e. g. injections, inhalation preparations).
3. Control measures
   • the system design needs to consider the risk of the whole process, such as the use of redundant design of the standby air compressor, the monthly start-up operation of 4 hours to prevent corrosion.
   • When the microbiological test is positive, soak the pipe with 75% alcohol for 2 hours, then rinse with purified water and sterilize again.
   • When transforming the system, argon arc welding must be used and endoscopic inspection must be done to avoid welding slag becoming a source of pollution.

Compressed air for 3. breathing: life safety as the bottom line

1. core Requirements
   • gas composition: oxygen content 20%-23%, carbon dioxide content <500ppm, carbon monoxide and other harmful gases need to be strictly controlled.
   • Microorganisms and particulate matter: Total number of bacteria and actinomycetes <100 CFU/m & sup3;, particulate matter <2000/m & sup3;.
   • Stability: Flow and pressure should be stable to avoid sudden changes affecting breathing safety.
2. Typical application scenarios
   • fire and emergency rescue (air-supplied breathing apparatus).
   • Medical areas (e. g. ventilators, anesthesia machines).
3. Control measures
   • follow the European standard DIN EN 12021:2014 or the US NFPA1989 standard.
   • Regular testing for oil content (by light absorption or gas chromatography), gas composition and microorganisms.

4. industrial manufacturing: stability and efficiency priority

1. core Requirements
   • cleanliness: dust content ≤ 5 mg/m & sup3;, oil content ≤ 10 mg/m & sup3;(specific industry varies, such as precision electronics industry requires higher).
   • dryness: The moisture content should be less than or equal to the pressure dew point (dew point temperature is usually in the range of 0-10 ℃).
   • Stability: Pressure and temperature should be stable to avoid affecting equipment operation and product quality.
2. Typical application scenarios
   • automotive spraying (moisture mixing will cause surface shrinkage).
   • Precision electronic manufacturing (such as circuit board, display production, moisture affects the life of components).
   • Solar photovoltaic (polysilicon material patch needs dry environment).
3. Control measures
   • adopt adsorption or freeze dryer, equipped with high efficiency filter.
   • Regularly check the water content (if meeting the second standard of ISO 85073, water content <0.1 mg/m & sup3;).

5. medical industry: comprehensive performance requirements

1. core Requirements
   • oil content<0.1 mg/m & sup3;, total bacterial count <100 CFU/m & sup3;.
   • Temperature maintain at 5 ℃-40 ℃, humidity 25%-75%.
   • Comply with Hospital Compressed Air Quality Standard (GB/T 14213-2013).
2. Typical application scenarios
   • operating room, intensive care unit (high air cleanliness requirements).
   • Production of medical devices (e. g. ventilators, anesthesia machines).
3. Control measures
   • use oil-free lubricating compressor or food-grade synthetic lubricating oil.
   • Install dew point meter and oil content detector to realize real-time monitoring and early warning.