The pressure of the air compression pipeline in the clean area workshop shall be in accordance with industry specifications, equipment requirements, system efficiency comprehensive determination, the following is specific guidance:
1. conventional pressure range
- pharmaceutical/Electronics Industry: The compressed air pipeline pressure in the clean area is usually 5-7 bar(gauge pressure).
- Food/Laboratory: Some low-demand scenarios may be used. 4-6 bar.
2. key influencing factors
- requirements for cleanliness level
- ISO Class 5 (Class 100) clean room: oil-free air compressor + multi-stage filtration is required, and the pressure is recommended to be 6-7 bar to ensure the quality of terminal gas.
- ISO Class 7 (10,000) clean room: 5-6 bar pressure can be used, and the oil content of the pipeline shall be regularly detected (≤ 0.01 mg/m & sup3;).
- Equipment requirements
- precision instruments (e. g. electronic assembly robots): stable pressure (volatility ≤ ± 0.1 bar).
- Transmission equipment (such as clean material hoist): check the pressure drop when the instantaneous flow is large, and it is recommended to reserve 10% allowance.
- Energy Saving and Noise Control
- high pressure (>7 bar) will increase energy consumption and noise, and an energy-saving controller is required.
- The pipeline flow rate is recommended to be controlled at 8-12 m/s, and the corresponding pressure loss is about 0.1 bar/10m.
3. design recommendations
- pressure grading design
- main pipe: 6-7 bar (to meet most equipment requirements)
- terminal equipment: graded gas supply through pressure reducing valve (such as 4 bar for precision instruments)
- material Selection
- pipeline: 316L stainless steel is recommended (to avoid zinc, copper and other metal ion pollution)
- joint: using sleeve type connection (reduce leakage point)
- monitoring and verification
- installation of online pressure sensor (accuracy ± 0.5%)
- annual DQ/IQ/OQ verification (design/installation/operation validation)
4. special scene processing
- biosafety Laboratory the positive pressure clean room needs an independent air supply system, and the pressure is maintained 5-10Pa higher than the outside.
- Freeze dryer supporting: When drying air below -40 ℃ is required, an adsorption dryer (pressure drop is about 0.3 bar) is required.
Note: The specific design must comply with GB 50736 "Clean Workshop Design Specification" and industry GMP requirements. It is recommended that professional compressed air system integrators provide customized solutions.
