# Full Process Risk Emergency Response Plan for Four Types of Anti-Corrosion Heating Tubes in Sterile Fermentation Workshops ## Emergency Disposal Plan for 316L Stainless Steel Heating Tube Accidents Main potential emergencies: Weld pitting perforation and liquid leakage, large-area rust block shedding polluting fermentation broth, excessive metal ion residue exceeding product standards, severe scaling leading to heating system shutdown. Pre-emergency early warning signals: Wall thickness attenuation exceeds 10%, heating power rises by more than 15%, rust spots spread on tube surface, abnormal liquid leakage alarm at the tank bottom. Step-by-step emergency disposal procedures 1. Cut off the heating power supply immediately once leakage or massive rust shedding is detected, close the inlet and outlet valves of the heating loop to isolate the defective tube bundle from the fermentation tank. 2. For batches contaminated by rust particles: Stop feeding and stirring, take liquid samples for metal ion detection; if metal residue exceeds the standard, drain the whole tank medium and carry out full tank sterilization and cleaning. 3. For equipment over-scaling shutdown: Trigger automatic CIP pickling program; if the blockage is serious, empty the tank and disassemble the tube bundle for offline descaling and supplementary passivation. 4. Post-emergency rectification: Complete wall thickness full inspection of all stainless steel tube bundles in the workshop, adjust the alkali cleaning temperature interlock threshold to strictly control it below 60℃, shorten the quarterly wall thickness detection cycle to two months. Post-accident hidden danger prevention: Add medium chloride real-time monitoring modules, increase CIP pickling frequency, and polish and re-passivate all welds of aging tube bundles. ## Emergency Disposal Plan for Pure Titanium Heating Tube Accidents Main potential emergencies: Fluoride ion contamination causing uniform tube wall thinning leakage, rust sediment falling from unisolated carbon steel supports, large-area scratch damage leading to titanium ion precipitation. Pre-emergency early warning signals: Online fluoride detector alarms, continuous low electrochemical potential of tube surface, obvious rust accumulation at the bottom of the tank, wide scratch coverage over 20%. Step-by-step emergency disposal procedures 1. If fluoride is detected in the medium, immediately stop all feeding and heating procedures, close the fluoride raw material pipeline master valve to cut off the pollution source. 2. Sample fermentation liquid to test fluorine and titanium ion content; if the index exceeds the limit, discard the whole tank product, circulate clean water to flush the tank and heating pipeline repeatedly until no fluoride residue is detected. 3. When rust sediment falls in large quantities: Shut down the heating loop, disassemble the tube bundle, replace all aging PTFE isolation sleeves, and thoroughly flush the tank with purified water to remove residual rust particles. 4. Post-emergency rectification: Carry out full potential scanning of all titanium tube bundles, add double mechanical interlocks on fluoride feeding pipelines, and arrange monthly online aeration maintenance for the cleaning system. Post-accident hidden danger prevention: Equip each tank with independent fluoride rapid detection equipment, standardize the use of nylon soft tools for all overhaul operations, and isolate all carbon steel components in contact with titanium tubes. ## Emergency Disposal Plan for Quartz Anti-Corrosion Heating Tube Accidents Main potential emergencies: Thermal shock or vibration induced tube rupture, glass micro-fragment mixed into medium, accidental alkali liquor circulation causing permanent frosting and microbial overgrowth. Pre-emergency early warning signals: Light transmission inspection finds penetrating microcracks, mechanical interlock failure of alkali pipeline, abnormal violent vibration of tube bundle support. Step-by-step emergency disposal procedures 1. Once quartz tube rupture is discovered, cut off heating and circulating pump power instantly, close all connected pipeline valves to prevent more glass fragments from flowing into the tank. 2. Completely drain all medium in the tank, use multi-stage filters to intercept glass debris, and conduct repeated microscopic inspection of liquid samples; any medium containing glass particles must be scrapped entirely without rework. 3. In case of misoperation of alkali cleaning liquid: Discharge all alkaline liquid immediately, circulate dilute acid to neutralize residual alkali, and carry out full light transmission inspection of the tube bundle to confirm frosting coverage area. 4. Post-emergency rectification: Replace all quartz tubes with microcracks, reinforce shock absorption gaskets of all supports, overhaul the mechanical interlock system of alkali pipelines to ensure forced locking function. Post-accident hidden danger prevention: Strictly limit the heating rate below 0.5℃ per minute, reduce circulating pump flow velocity, and carry out light transmission crack inspection every half month instead of monthly. ## Emergency Disposal Plan for PFA Coated Heater Accidents Main potential emergencies: Coating penetration exposing carbon steel substrate and rust leakage, high-temperature aging shedding plastic micro-particles, large-area blister peeling caused by cold-hot alternation. Pre-emergency early warning signals: Coating damage area exceeds 5%, long-term medium temperature over 95℃, abnormal plastic particle detection in finished liquid, continuous power surge due to coating blistering. Step-by-step emergency disposal procedures 1. Trigger over-temperature power-off protection immediately when the temperature exceeds the limit, isolate the defective heating loop and stop batch fermentation operation. 2. If plastic micro-particles or rust contamination occurs: Discard the whole tank medium, carry out full tank disinfection and pipeline flushing, and test the liquid until no polymer or metal impurities exist before restarting production. 3. For large-area coating blistering and peeling: Directly remove the heater for replacement; local coating repair is not allowed due to unrecoverable hidden penetration damage. 4. Post-emergency rectification: Calibrate all temperature interlock sensors of PFA heating equipment, reset the automatic slow cooling program after cleaning, and add high-precision solid particle filters at the pipeline inlet. Post-accident hidden danger prevention: Reduce the concentration of hydrogen peroxide disinfectant by half, prohibit the use of any metal hard tools during maintenance, and shorten the full coating scanning inspection cycle to quarterly. ## Universal Emergency Management Specifications for the Workshop 1. Emergency material configuration requirements: Equip independent isolation valves, multi-stage filter devices, sampling detection kits and neutralization cleaning reagents for each heating tube material area; store special sealing containers for broken quartz fragments and fluorine-containing waste residues separately. 2. Personnel emergency training mechanism: Conduct quarterly emergency drill targeting the most frequent accident types of each heating tube material; all operators must master power-off isolation, medium sampling and tank emptying disposal procedures. 3. Accident traceability filing rule: Record the whole process of early warning signal discovery, disposal steps, batch loss statistics and post-accident rectification measures in the equipment full-life-cycle file, and retain sample test reports as audit vouchers. 4. Cross-contamination prevention requirement: After handling fluoride, alkali or fluoroplastic pollution accidents, thoroughly flush the whole pipeline and tank body before switching to new batches to avoid cross-contamination of subsequent fermentation products. 5. Regular hidden danger troubleshooting: Combine online monitoring data and daily patrol records to sort out potential failure risks monthly, and formulate targeted rectification plans for equipment reaching early warning thresholds to eliminate accidents in advance. ## Summary The emergency response logic of the four heating tubes is formulated based on their unique high-risk accident types. Stainless steel emergency disposal focuses on metal ion and rust particle pollution control; titanium tube emergency core lies in rapid cutting off fluoride pollution sources to avoid irreversible tube wall corrosion; quartz tube accident disposal prioritizes intercepting glass fragments to prevent full batch scrapping; PFA coating emergency procedures center on temperature control and replacing damaged heaters to block plastic foreign body risks. Standardized classified emergency plans can minimize batch economic losses and product quality safety hazards once equipment failure occurs, and the post-accident rectification mechanism can effectively reduce the recurrence probability of similar accidents in long-term fermentation production.
