CIP (Clean-in-Place)
Definition
A technology that cleans the inside of production equipment through an automated system without dismantling the equipment.
Application Scenario
- Pharmaceutical industry: cleaning reactors, pipelines, tablet presses, etc.
- Food industry: cleaning filling lines, storage tanks.
- Chemical industry: removing reaction residues.
Processes
- Pre-rinsing: Remove large particle residues.
- Alkaline/acid rinsing: Use chemical cleaning agents to dissolve organic or inorganic substances.
- Rinsing: Rinse with pure water or water for injection (WFI) until neutral.
- Drying: Drying by passing clean air or nitrogen.
Advantages
Reduces downtime, avoids cross-contamination, and complies with GMP regulations.
SIP (Sterilization-in-Place)
Definition
Sterilization by high temperature steam or chemical methods without disassembly of equipment.
Application Scenario
- Aseptic preparation production (e.g. injection, biopharmaceuticals).
- Food aseptic filling system.
- Laboratory fermentation tanks, lyophilizers.
Methods
- Steam sterilization: saturated steam above 121℃, maintain 15-30 minutes.
- Chemical sterilization: hydrogen peroxide (VHP), ozone, etc.
- Radiation sterilization: γ-ray (equipment compatibility required).
Validation Requirements
Challenge test with bioindicator (e.g., Bacillus thermophilus) is required to ensure sterility assurance level (SAL ≤ 10-⁶).
Synergistic use of CIP and SIP
Typical process
CIP cleaning → SIP sterilization → production → repeat.
Applicable equipment
Tablet presses (pharmaceutical), fermenters, piping systems, filling lines.
Automated control
Integrated PLC system to record critical parameters such as temperature, pressure, time, etc., complying with data integrity requirements (e.g. FDA 21 CFR Part 11).
Critical Considerations
CIP
- Cleaning agent selection needs to be compatible with equipment material (e.g. 316L stainless steel).
- Verify cleaning residuals (TOC, conductivity, etc.).
SIP
- Avoid steam condensate buildup (slope design and trap required).
- Cooling to process temperature is required after sterilization to prevent degradation of heat sensitive materials.
Regulatory Requirements
- Pharmaceutical industry needs to comply with GMP, FDA/EMA guidelines.
- Food industry follows HACCP, ISO 22000.
Industry Cases
- Pharmaceutical: Vaccine production line, reaction tanks ensure sterility through CIP/SIP.
- Food: Dairy filling equipment is cleaned daily by CIP and sterilized periodically by SIP.
- Biotechnology: Bioreactor sterilization in monoclonal antibody production.