• Comprehensive Technical Assessment: Used borescope inspection to locate concentrated rust areas (e.g., pump cavities, welds) and assess microbial contamination. Quantified tank corrosion levels using a surface roughness tester. • Customized Process Design – Segmented Chemical Cleaning: Applied CIP100 alkaline cleaner (STERIS USA, 5%, 70°C) in circulation to strip biofilm matrices. Utilized CIP200 acidic cleaner (STERIS USA, primarily phosphoric & citric acid, concentration gradient control) to target-dissolve iron oxide deposits and restore the passivation layer. • Precision Resource Allocation: Assembled an expert team (cleaning engineers, lab specialists, etc.) for around-the-clock shift rotation. • Optimized cleaning processes and on-site connection plans to minimize assembly time. Employed Critical Path Method (CPM) for task scheduling, enabling parallel operations across multiple systems.

• Efficiency Breakthrough: Completed treatment of 3 sets of WFI storage & distribution systems in just 4 days, reducing the standard cycle time by 20%. • Quality Compliance: Achieved zero visual rouging residue, passed all passivation layer tests, and restored water quality to meet production standards. • Added Value: Provided the client with a stainless-steel derouging management lifecycle model and assisted in establishing a preventative maintenance mechanism.