Medical Device Sterilization — Specification for Ethylene Oxide Sterilization Exhaust Gas Treatment
Technical compliance guidelines for safe collection, transport, and purification of EO emissions in accordance with global regulatory frameworks.
Normative References
The following documents are indispensable for the application of this specification. For dated references, only the indicated version applies. For undated references, the latest version (including all amendments) applies.
| CN Standard | International Equivalent | Description |
|---|---|---|
| GB 11721 | ايزو 16000-1 | Hygiene standard for EO in workshop air |
| GB 13347 | ايزو 16852 | Flame arresters for gas pipelines |
| GB 16157 | ايزو 12141 | Sampling methods for gaseous pollutants |
| GB 16297 | ايزو 14001 Frame | Comprehensive emission standards for air pollutants |
| GB 50016 | NFPA 101 | Code for fire protection design of buildings |
| GB 50236 | ايزو 15609 | Field equipment & industrial piping welding/construction |
| GB 50275 | ايزو 10816 | Installation of compressors, fans, and pumps |
| HJ/T 76 | EN 15267 | Technical requirements for CEMS |
| HJ/T 386-388 | ايزو 10121 | Adsorption, Absorption, and Catalytic purification tech |
| HJ/T 2000 | ايزو 14031 | Atmospheric pollution control engineering guidelines |
3 Terms and Definitions
The following terms and definitions apply to this document.
Additional definitions include 3.12 Safety Operating Procedures, 3.14 PPE, 3.16 Ventilation System, and 3.18 Monitoring & Control.
4 General Principles
4.1 Basic Principles: To ensure the exhaust treatment process is safe, economical, feasible, and environmentally friendly.
- 4.1.1 Safety: Mandatory personnel protection via PPE and explosion-proof facility design.
- 4.1.2 Economy: Reasonable investment, operation, and maintenance (O&M) costs.
- 4.1.3 Feasibility: Implementation of verified, easy-to-install, and maintainable technical solutions.
- 4.1.4 Environmental: Ensuring concentrations comply with national and local emission limits.
4.2 Quality Management: Maintaining a QMS to ensure process consistency and reliability.
4.3 Process Control & Monitoring: Continuous monitoring of EO concentration, temperature, humidity, and time.
4.4 Change & Non-conformity Control: Assessment of any process changes and immediate corrective actions for non-conformities.
5 Technical Requirements
5.1 Equipment and Facilities
5.1.1 Collection: Implement sealed and negative-pressure measures for EO emission equipment.
5.1.2 Transport: Short, compact, and grounded piping systems. Flanges must be cross-connected to prevent static discharge.
5.1.3 Discharge: Stack height must comply with GB 16297 and local EIA requirements. Lightning protection is mandatory for stacks.
5.1.4 Exhaust Detection (Sampling)
- Prefer vertical pipe sections for sampling.
- Avoid bends or sections with rapid cross-sectional changes.
- Sampling points must be ≥6 diameters downstream and ≥3 diameters upstream from bends or variable diameters.
6 Construction and Acceptance
6.1.1 General: Construction must follow design drawings and technical documents.
6.1.4 Fire Resistance: Facilities must meet GB 50016 fire protection ratings.
6.1.5 Explosion Protection: Due to EO flammability, use explosion-proof electrical equipment and provide adequate ventilation (6.1.6).
6.4 Acceptance Content:
- 6.4.1 Appearance: Clear signage, warning marks, and intact equipment (6.4.1).
- 6.4.2 Leak-tightness: Verified pipeline connections and structural stability.
- 6.4.4 Performance: Minimum of three tests for EO inlet/outlet concentrations and purification efficiency.
- 6.4.5 Safety: Testing of emergency stops, alarm systems, and fire-prevention measures.
6.5 Acceptance Procedure: Includes trial runs (6.5.1), performance evaluation (6.5.2), and final reporting (6.5.4).
7 Daily Operation and Maintenance
7.1 Standard Operation: Compliance with equipment manuals and real-time monitoring of discharge levels.
7.2 Management: Establishment of an environmental department and strict technical responsibility systems (7.3).
7.4 Inventory: Maintaining a stock of vulnerable spare parts to ensure continuous operation.
7.5 Calibration: Regular calibration of gas detection instruments to ensure data accuracy and integrity.
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