Food factory compressed air standards need to meet food hygiene and safety requirements, the core around oil content, water content, particulate matter, microorganisms four major indicators. The following are specific standards and implementation points:
1. core quality indicators
| Indicators | food Grade Standards | detection basis |
|---|
| oil content | ≤ 0.1 mg/m & sup3;(pharmaceutical grade ≤ 0.01 mg/m & sup3;) | ISO 8573-1 Class 0-1 |
| moisture content | pressure dew point ≤-40 ℃ (water content & asymp;0.001 g/m & sup3;) | ISO 8573-1 Class 1-2 |
| particulate matter | ≤0.1μm(ISO Class 1.2.1) | ISO 8573-1 Classification of particulate matter |
| microorganisms | bacterial count ≤ 100 CFU/m & sup3; | reference to FDA/EFSA health standards |
| smell | no peculiar smell or odor ≤ 0.5 | sensory evaluation + instrumental testing |
2. equipment configuration and management requirements
- selection of air compressor:
- oil-free air compressor: Recommended water lubrication or resin lubrication model, oil content ≤ 0.01ppm.
- Drying equipment: Adsorption dryer (dew point ≤-40 ℃)+ post filter to ensure dryness.
- Filtration system:
- three-stage filtration pre-coarse filter (≥ 1μm)+ precision filter element (0.01 μm)+ activated carbon adsorption (removal of oil vapor).
- Filter Element Replacement: Replace every 2000 hours or when the pressure difference reaches 0.7bar.
- Pipeline Design:
- material304/316L stainless steel, avoid galvanized pipe or plastic pipe.
- Layout: Reduce elbows and set up automatic drain valves (drain every 15 minutes).
3. detection and verification
- regular inspection:
- oil content: Quarterly detection, using thermal conductivity sensor or infrared spectroscopy.
- dew point daily monitoring, calibration error shall be ≤ ± 2 ℃.
- Particulate matter: Semi-annual use of laser particle size analyzer.
- Certification requirements:
- conform to standard ISO 8573-1:2010 Class 1.2.1,GB/T 13277.1-2023.
- Third-party verification: An inspection report is issued annually by an authoritative organization.
4. risk control measures
- emergency plan:
- pollution incident: Switch the standby air source immediately and start the deep disinfection procedure.
- Equipment failure: Equipped with redundant air compressor to ensure uninterrupted air supply.
- Personnel training:
- operation Specification: Train personnel to master skills such as dew point monitoring and filter element replacement.
- Records Management: Keep 2 years of maintenance records for easy traceability.
5. practical application cases
- A dairy enterprise: Using oil-free air compressor and adsorption dryer, the compressed air quality reaches ISO Class 1.1.1, and the failure rate of packaging line is reduced by 60%.
- Beverage Filling Plant: Through the combination of activated carbon filtration and ultraviolet sterilization, the microbial index is stably controlled at <50 CFU/m & sup3;.
Summary: The compressed air in the food factory needs to be controlled from equipment, filtration, detection to management. It is recommended to give priority to the integrated oil-free air compressor station and realize real-time quality tracking through the digital monitoring platform.
