# Fermentation Heating Tube Anti-Corrosion Equipment Spare Parts Anti-Rust Storage, Pre-Installation Inspection & Protective Handling Specification ## Preface This specification (Doc.169) is a spare parts lifecycle anti-corrosion management supplementary document for the complete anti-corrosion system ranging from Doc.15 to Doc.168. It standardizes the classified warehousing, environmental storage control, regular anti-rust maintenance, outgoing protection, pre-installation surface inspection and on-site standardized handling of spare heating tubes, pipe fittings, flanges, valves, sealing elements and welding consumables. Unreasonable storage, bare transportation and rough handling often cause surface rust, passive film damage, scratch abrasion and seal aging of metal spare parts before installation. Defective spare parts put into service will form inherent corrosion weak points, greatly shortening the service life of newly replaced pipeline sections. This specification realizes full anti-corrosion protection from spare parts incoming acceptance to formal installation, eliminates pre-service hidden corrosion risks of replacement components, and guarantees the consistency of anti-corrosion performance between new spare parts and original operating equipment. ## 1. Spare Parts Incoming Anti-Corrosion Acceptance and Classified Warehousing All metal pipeline spare parts must be inspected for surface integrity before being put into storage. Check for rust spots, mechanical scratches, oxide layers, deformation and packaging damage; stainless steel and titanium alloy materials need spot passive film verification to confirm no surface passivation failure. Spare parts are divided into metal pressure pipe components, precision valves, rubber/PTFE sealing parts and welding auxiliary materials for classified storage. High-precision and corrosion-sensitive components shall be placed in sealed constant-temperature dry warehouses, while conventional pipe fittings can be stored in ventilated anti-moisture storage areas. Each batch of spare parts is labeled with material grade, production date, anti-rust expiration date and unique storage number to achieve full batch traceability. ## 2. Warehouse Environmental Control and Regular In-Stock Anti-Rust Maintenance Warehouse temperature and humidity are monitored daily to maintain humidity within the anti-rust safe range; dehumidification and ventilation measures shall be activated in plum rain and high-temperature humid seasons. Metal spare parts stored in sealed packaging shall be inspected quarterly for packaging integrity and anti-rust agent validity. For bare stored stainless steel fittings without sealed packaging, regular anti-rust oil spraying or volatile anti-rust paper wrapping shall be conducted to prevent atmospheric rusting. Sealing gaskets and polymer components need light-shielded and low-temperature storage to avoid aging, embrittlement and deformation caused by high temperature and ultraviolet radiation, which would lead to sealing failure and crevice corrosion after installation. ## 3. Outbound Packaging, Transportation and On-Site Anti-Collision Protection When spare parts are issued from the warehouse, original anti-rust packaging shall be kept intact; exposed metal surfaces shall be wrapped with anti-rust film and buffer protective materials to avoid friction, collision and rainwater erosion during handling and transportation. Long-distance transferred pipe fittings shall be fixed firmly in transport pallets to prevent relative displacement abrasion. On-site hoisting and carrying must use soft slings instead of steel wire ropes to avoid scratching the metal passive film. Spare parts are prohibited from being directly placed on the damp ground or acid-alkaline spilled operation area; temporary placement must be laid with dry non-metallic cushion boards for isolation protection. ## 4. Pre-Installation Surface Cleaning, Defect Screening and Anti-Corrosion Treatment Before formal installation, all spare parts shall be unpacked and inspected again to eliminate rust, scratches, packaging residue contamination and deformation formed during storage and transportation. Anti-rust oil, protective wrapping residues and dust on inner and outer surfaces must be thoroughly cleaned with qualified solvent and purified water. Spare parts with slight surface rust or local passive film damage shall be subjected to polishing repair and on-site pickling passivation treatment; components with deep scratches, pitting rust or material deformation shall be rejected and returned to the warehouse and must not be installed to avoid introducing inherent corrosion defects. Sealing surfaces and flange contact faces are key inspection positions to prevent crevice corrosion after assembly. ## 5. Post-Installation File Archiving and Spare Parts Inventory Optimization The installation batch, material certificate, pre-installation inspection record and passivation treatment data of all replaced spare parts shall be archived into the equipment full-life ledger, and the installed position shall be marked as a key regular inspection point. The warehouse department counts spare parts rust loss and rejection causes every six months, optimizes packaging modes, warehouse layout and inventory turnover cycle to avoid long-term overstock leading to anti-rust failure. Typical cases of spare parts premature corrosion caused by improper storage and handling are sorted into the enterprise anti-corrosion knowledge base for procurement, warehouse and maintenance staff training. ## 6. System Value This specification extends the anti-corrosion control boundary forward to the spare parts storage and handling link, avoids introducing avoidable corrosion weak points from replacement components, ensures that newly installed equipment maintains the original design anti-corrosion performance, forms a complete closed-loop anti-corrosion management covering raw material procurement, spare parts storage, maintenance replacement and on-site operation, and further improves the full-lifecycle refined anti-corrosion governance system of fermentation heating tubes.
