Abstract: As the core link in establishing the anti-corrosion systems and managing corrosion risks for refining and chemical units, design material selection directly determines the operational safety, stability and maintenance economy throughout the entire lifecycle of the units. Drawing on over a decade of practical experience in material selection design, anti-corrosion optimization and risk mitigation for large-scale refining and chemical projects of a certain company, this paper highlights the application of Material Selection Diagrams (MSD) and intelligent material selection systems in engineering design. Furthermore, the paper explores in depth the synergistic application of Risk-Based Inspection (RBI) technology and systematic online corrosion monitoring and detection systems. The resulting design material selection methodologies and corrosion control experiences can provide standardized and replicable engineering reference for material selection and anti-corrosion design in large-scale units, thereby facilitating their safe, stable and long-cycle operation.

Key words: refining and chemical unitsldesign material selectionlcorrosion risk controllMaterial Selection Diagram (MSD) poses recommendations for improving relevant regulations and standards