Dust content requirements for screw air compressor inlet
The dust content of the inlet air compressor directly determines the life of the equipment and the quality of the compressed air. According to the compressed air purity rating standard ISO 8573-1:2010, the control of intake air dust content should be matched according to the requirements of the terminal air consumption scenario:
- Class 1 (Precision Manufacturing): Dust content ≤ 0.1 mg/m³, particle size ≤ 0.1 μm
- Class 2 (General Industrial): Dust content ≤ 1 mg/m³, particle size ≤ 1 μm
- Class 3 (Basic Engineering): Dust content ≤ 5 mg/m³, particle size ≤ 5 μm
Why do we need to strictly control the dust content of intake air
- Quantitative analysis of equipment wear Dust with a particle size of> 5 μm will cause scratches on the surface of the screw rotor. For every increase in dust content of 10 mg/m³, bearing life will be shortened by 18%.case: A cement factory was not equipped with a pre-filtration system, and the overhaul cycle of the air compressor was shortened from 12,000 hours to 6,500 hours.
- Process contamination risk In semiconductor wafer manufacturing, 1 mg/m³ of dust can cause contamination of lithography machine masks (a single loss exceeds 2 million yuan). The GMP of the pharmaceutical industry requires that the dust content of compressed air in clean areas should be less than 0.01 mg/m³ (corresponding to ISO 8573-1 Class 1).
- Energy consumption cost correlation For every 0.1 bar increase in the pressure difference of the filter element, the energy consumption of the air compressor will increase by 2%(calculated based on the 90 kW model, the annual electricity loss exceeds 36,000 yuan).
Core parameter selection criteria
According to ISO 8573-1:2010 and industry specifications, the following parameters need to be verified:
| parameters | semiconductor industry | food production | power industry |
|---|---|---|---|
| Maximum allowable dust content | ≤0.01 mg/m³（Class 0） | ≤0.1 mg/m³（Class 1） | ≤1 mg/m³（Class 2） |
| Filtration system requirements | Three-stage filtration (H14+ activated carbon) | Secondary filtration (H13+ oil removal) | Primary centrifugation + bag filtration |
| monitoring methods | Laser particle counter (0.1μm) | Differential pressure sensor + regular inspection | Visual inspection + quarterly inspection |
Potential risks of non-compliance
| risk types | semiconductor industry | General Manufacturing |
|---|---|---|
| Equipment maintenance costs | Lithography machine maintenance fee ≥ 500,000 yuan/time | Screw air compressor overhaul fee ≥ 120,000 yuan/time |
| production losses | Wafer yield dropped 0.5% | Pneumatic tool failure rate increased by 30% |
| legal risks | Penalty for violating SEMI S2 standards | Emission fines for violating GB16297 |
Economic comparison of compliance plans
| programme | Initial investment cost | 5-year comprehensive cost | Dust control level |
|---|---|---|---|
| Centrifugal pre-filtration +HEPA | 8-12 million Yuan | 180,000 – 220,000 yuan | ≤0.01 mg/m³ |
| Bag filtration + activated carbon | 3-5 million Yuan | 150,000 – 200,000 Yuan | ≤0.1 mg/m³ |
| Single-stage paper filter | 0.8 – 12,000 yuan | 10 – 15 million Yuan | ≤1 mg/m³ |
Innovation Practice of Shanghai Granklin Group
The intelligent monitoring system developed by the company based on the ISO 8573 – 1:2010 Class 0 standard can predict filter element life through AI algorithms (error rate <5%). It is equipped with a German Tüv certified H14 filter module, achieving 18,000 consecutive hours of zero-failure operation in the semiconductor industry.
industry recommendations
selection principle
Actual demand dust content = terminal standard requirements × safety factor (recommended to take 1.5 – 2.0)
example: Food production requires Class 1, and a filtration system with an actual capacity of ≤ 0.05 mg/m³ should be selected.
maintenance strategy
- The filter pressure differential is recorded weekly (warning is required when the growth rate exceeds 0.03 bar/week).
- The dust content is tested quarterly (the weight method in Annex B of ISO 8573-1 can be used for testing).
