1. Source Medium Control & Material Optimization
- Control at the source – optimize processes to reduce acid value, sulfur, and water content in crude oil.
- Select appropriate materials (low‑carbon, low‑sulfur/phosphorus steel) and increase plate thickness in corrosion‑prone areas.
- Enhances inherent corrosion resistance of the equipment.
2. External Wall Coatings & Passivation Protection
- Strict coating protection – clean substrate to high standard, apply epoxy zinc‑rich primer, intermediate coat, and polyurethane topcoat.
- Passivation processes create stable oxide film blocking air, moisture, and chemical attack.
- Forms dense protective barrier against atmospheric and underground corrosion.
3. Zonal Coating & Cathodic Protection for Internal Walls
- Zone‑specific coatings – insulating coatings for bottom/water contact areas; conductive coatings for vapor‑phase zone.
- Implement sacrificial anode cathodic protection (e.g., aluminum‑based anodes) for tank bottom plate.
- Prevents galvanic corrosion through electrochemical means.
4. Routine Inspection, Maintenance & Online Monitoring
- Establish corrosion record log – regular wall thickness measurement, weld flaw detection, and magnetic flux leakage testing.
- Monitor coating condition and promptly touch up peeling areas.
- Avoid strong acids/alkalis during cleaning to protect passivation layer on stainless steel tanks.