# Full Set of Anti-Corrosion KPI Assessment Indicators for Fermentation Heating Tube System ## Preface A complete anti-corrosion management system requires quantifiable KPIs to assess implementation effects of equipment, process, operation and maintenance. This index system covers hardware status, process control, patrol inspection, maintenance execution, failure loss and training assessment, applicable to production shifts, equipment teams and workshop management departments, supporting monthly/quarterly performance appraisal and continuous anti-corrosion optimization. ## Chapter 1 Hardware Configuration & Status KPIs (Responsible: Equipment Maintenance Team) ### 1.1 Pipeline & Heating Tube Hardware Indicators 1. Dead zone elimination compliance rate Calculation formula: Qualified pipeline segments without excessive dead legs ÷ Total pipeline segments ×100% Standard target: ≥98% Explanation: Dead leg length ≤1.5 times pipe diameter; redundant blind pipes removed; large-radius elbows installed. 2. Heating tube incoming qualification rate Formula: Passed heating tubes after inspection ÷ Total newly purchased heating tubes ×100% Target: 100% Inspection items: Weld flaw detection, coating thickness, scratch inspection, pressure resistance test. 3. Material matching compliance rate Formula: Loops with material matching medium conditions ÷ All heating circulation loops ×100% Target: 100% Judgment standard: No quartz connected to alkali pipelines; no stainless steel used for high-chloride processes; titanium equipped with PTFE isolation gaskets. 4. Filtration system intact rate Formula: Normally operating two-stage filter sets ÷ Total filter sets of heating loops ×100% Target: ≥99% Standard: Coarse + fine filter complete, no screen damage, pressure difference alarm function effective. ### 1.2 Online Monitoring & Interlock Equipment KPIs 1. Anti-corrosion parameter interlock coverage rate Formula: Loops equipped with pH/chloride/DO/temp/flow interlock ÷ All heating loops ×100% Target: 100% 2. Sensor monthly calibration pass rate Formula: Qualified calibrated sensors ÷ Total online anti-corrosion sensors ×100% Target: 100% 3. Interlock alarm effective response rate Formula: Alarms with complete troubleshooting records ÷ Total abnormal interlock alarms ×100% Target: 100% Forbidden: Clear alarms without root cause disposal. ## Chapter 2 Production & CIP Process Control KPIs (Responsible: Production Shift Operators) ### 2.1 Medium environment parameter compliance rate 1. pH qualified rate during fermentation holding Formula: Hours with pH within material safe range ÷ Total fermentation holding hours ×100% Target: ≥99.5% 2. Chloride concentration up-to-standard rate Formula: Qualified medium/water sampling times ÷ Total sampling times ×100% Target: ≥99% 3. Dissolved oxygen compliance rate (titanium loops only) Formula: Hours with DO ≥8mg/L ÷ Total titanium loop operation hours ×100% Target: ≥99.8% ### 2.2 CIP standardized execution KPIs 1. Complete CIP process execution rate Formula: Batches without skipped rinsing segments ÷ Total production batches ×100% Target: 100% 2. Rinsing endpoint qualification rate Formula: Cycles reaching neutral pH/conductivity before next step ÷ Total CIP cycles ×100% Target: 100% 3. CIP temperature control pass rate Formula: Cycles with hot alkali temperature within material limit ÷ Total CIP alkali cycles ×100% Target: ≥99.5% Limit: 316SS ≤55℃; PFA ≤85℃ 4. CIP flow velocity compliance rate Formula: Cycles maintaining material safe flow velocity ÷ Total CIP cycles ×100% Target: ≥99% ### 2.3 Thermal cycle & standby static control KPIs 1. Safe static standby time compliance rate Formula: Standby periods not exceeding material maximum static limit ÷ Total loop standby periods ×100% Target: ≥99% 2. Mandatory slow cooling implementation rate Formula: High-temp disinfection batches with full 40min slow cooling ÷ Total high-temp batches ×100% Target: 100% 3. Daily start-stop frequency compliance rate Formula: Days with start-stop times within material limit ÷ Total production days ×100% Target: ≥99% ## Chapter 3 Daily Patrol & Regular Detection KPIs (Joint Responsibility: Operators + Equipment Staff) 1. Shift patrol record completeness rate Formula: Shifts with fully signed patrol checklists ÷ Total shifts ×100% Target: 100% 2. Abnormal early warning timely reporting rate Formula: Abnormal corrosion signs reported on time ÷ Total discovered abnormal points ×100% Target: 100% 3. Monthly quantitative detection completion rate Formula: Heating tubes finished potential/infrared/thickness test ÷ All heating tube bundles ×100% Target: 100% 4. Quarterly comprehensive overhaul completion rate Formula: Bundles finished wall thickness, pressure resistance inspection ÷ All heating bundles ×100% Target: 100% ## Chapter 4 Standardized Maintenance & Consumable Management KPIs (Responsible: Equipment Team) 1. Filter screen cleaning on-time rate Formula: Filters cleaned per shift as required ÷ Total filter sets ×100% Target: 100% 2. Gasket regular replacement compliance rate Formula: Gaskets replaced within specified cycle ÷ Total flange gaskets ×100% Target: ≥99% Rule: Any disassembled gasket replaced with new one. 3. Periodic anti-corrosion maintenance completion rate Formula: Completed passivation / monthly acid pickling plans ÷ Scheduled maintenance tasks ×100% Target: 100% 4. Post-overhaul double CIP implementation rate Formula: Overhaul pipelines with two full CIP cycles before startup ÷ Total overhaul pipelines ×100% Target: 100% 5. Consumable classified storage compliance rate Formula: Color-labeled classified gasket/filter storage cabinets ÷ Total spare parts storage points ×100% Target: 100% ## Chapter 5 Corrosion Failure & Economic Loss KPIs (Core Assessment Indicator for Workshop) 1. Monthly heating tube sudden failure frequency Target value: 0 times/month Definition: Leakage, rupture, large-area coating peeling causing unplanned shutdown. 2. Average service life of heating tubes Baseline reference standard: - 316 Stainless steel: ≥18 months - Grade 2 Titanium: ≥24 months - PFA coated heater: ≥12 months - Quartz glass: ≥8 batches Assessment: Actual service life ÷ Baseline life ×100%, target ≥100% 3. Batch loss rate caused by heating tube corrosion failure Formula: Abandoned batches due to tube leakage/contamination ÷ Total monthly batches ×100% Target: 0% 4. Monthly heating tube maintenance & replacement cost per ton of fermentation broth Calculation: Total monthly tube maintenance expense ÷ Monthly total fermentation volume Assessment target: Continuous year-on-year decline ## Chapter 6 Anti-Corrosion Training & Personnel Assessment KPIs (Responsible: Production Management) 1. Monthly anti-corrosion training attendance rate Formula: Attended operators ÷ Total frontline staff ×100% Target: 100% 2. Training theoretical & practical assessment pass rate Formula: Staff with qualified exam scores ÷ All trained personnel ×100% Target: 100% 3. Forbidden misoperation monthly occurrence times Target: 0 times/month Typical misoperations: Over-temperature alkali cleaning, titanium loop aeration shutdown, skipping rinsing segments. ## Chapter 7 KPI Graded Scoring & Application Rules ### 7.1 Risk weight division 1. Zero-failure core indicators (weight 40%): Sudden tube failure frequency, batch loss rate, interlock alarm response rate, CIP full-process execution rate 2. Process operation indicators (weight 30%): Parameter compliance rate, slow cooling/static control compliance rate 3. Maintenance & patrol indicators (weight 20%: detection completion, maintenance on-time rate, patrol record integrity) 4. Training & hardware indicators (weight 10%) ### 7.2 Monthly appraisal application 1. Shift assessment: Take process patrol KPI as core, link with performance bonus; zero misoperation shifts get reward; repeated parameter over-limit deducts points. 2. Equipment team assessment: Focus on hardware intact rate, maintenance completion rate, failure frequency; penalize repeated hardware transformation omissions. 3. Workshop quarterly comprehensive evaluation: Compare heating tube average service life and loss rate year-on-year, as core index of equipment management performance. ## Summary This multi-dimensional KPI system quantifies all links of heating tube full-lifecycle anti-corrosion management, converting qualitative operation standards into measurable digital indicators. Regular statistical tracking and appraisal can quickly locate weak links of anti-corrosion control in production, maintenance and management, drive continuous process optimization, fundamentally reduce corrosion failure frequency, extend heating tube service life and cut comprehensive equipment operation costs.
