Design and Corrosion Protection Technology Application of 100,000 m³ Floating Roof Crude Oil Storage Tank

The 100,000 m³ floating roof crude oil storage tank optimizes the tank wall thickness using a variable point design method, achieves structural stability through interactive sleeve connections, and uses a combination of 1.2mm thick steel plate and asphalt sand foundation for the tank bottom, meeting the seismic performance requirements of magnitude 8 earthquakes. The floating roof is designed as a double-deck steel pontoon structure with a diameter of 80 meters, equipped with an elastic sealing system, which can reduce oil evaporation loss by more than 85%. The tank body uses API 5CT standard steel, with 316L stainless steel welding used in key parts. The wind girder and stiffening ring are reinforced according to domestic standards.

The corrosion protection technology adopts a composite protection system: the inner wall of the floating deck is sprayed with nano-waterborne paint to solve the safety hazards of construction in confined spaces; the tank bottom cathodic protection system is used in conjunction with sacrificial anodes to inhibit electrochemical corrosion; the parts below the oil-water interface are lined with nickel-based alloy to resist sulfide corrosion. For marine environments, the outer wall adopts a three-layer protection of epoxy coal tar pitch + fiberglass cloth, with a service life of 15 years in salt spray environments. The welds are subjected to phased array testing, with a defect rate of less than 0.5%, ensuring structural integrity.

This design achieves full life cycle management through material optimization and intelligent monitoring. The floating roof sealing system uses a new type of anti-aging rubber strip, combined with a laser displacement sensor to monitor liquid level fluctuations in real time. The tank area is equipped with a VOCs recovery device, which reduces oil and gas emissions by 120 tons per year, meeting carbon neutrality requirements. Modular prefabrication technology is used in construction, shortening the construction period by 30%, and reducing the amount of steel used per tank by 18% compared to traditional designs. A digital twin model is applied during the operation and maintenance phase, and predictive maintenance reduces the failure rate by 40%, reducing the overall operating cost by 25%.