Asset Integrity
How Risk Based Inspection Works for Aging Refinery Assets
Vinit Pandey · Published 4 August 2026
In short: RBI for aging refinery assets ranks equipment by calculated risk of failure, combining active damage mechanism assessment with consequence of failure, so turnaround inspection scope and interval can concentrate on the equipment items that actually carry the highest risk.
Key takeaways
- Time-based uniform inspection intervals are poorly targeted at real risk for aging refinery assets
- Damage mechanism assessment must reflect refinery-specific mechanisms like sulfidation and hydrogen cracking
- Consequence of failure correlates strongly with inventory size and proximity to occupied areas
- Risk ranking lets turnaround scope concentrate inspection effort on genuinely high-risk equipment
Refineries operate large populations of static equipment — pressure vessels, piping circuits, storage tanks, heat exchangers — many of which have been in service for decades, making time-based uniform inspection intervals both expensive and poorly targeted at real risk.
Damage mechanism assessment for refinery equipment must account for corrosive crude slates, high-temperature sulfidation, hydrogen-related cracking in hydroprocessing units, and erosion in high-velocity piping — each mechanism requiring different inspection techniques to detect reliably.
Consequence of failure assessment weighs the safety, environmental, and financial impact of a loss of containment at each equipment item, often correlating strongly with inventory size and location relative to occupied areas or other high-value equipment.
The resulting risk ranking is what allows a refinery to reduce inspection scope on genuinely low-risk equipment during a turnaround while increasing inspection frequency and technique rigor on the highest-risk assets — improving both safety outcomes and turnaround economics.