Asset Integrity
What is RBI? Risk Based Inspection Explained
Vinit Pandey · Published 25 November 2025 · Updated 28 June 2026
In short: RBI (Risk Based Inspection) is a methodology, codified in API 580 and API 581, that prioritises inspection resources and intervals according to the calculated risk of failure for each piece of equipment.
- Equipment Population
- Probability of Failure
- Consequence of Failure
- Risk Ranking
- Inspection Plan & Interval
Key takeaways
- Codified in API 580 (methodology) and API 581 (quantitative risk basis)
- Probability of failure considers active damage mechanisms — corrosion, fatigue, cracking
- Consequence of failure considers safety, environmental, and financial impact
- Focuses inspection budget on genuinely high-risk equipment, can extend intervals on low-risk items
Traditional inspection programs apply largely uniform, time-based intervals across an asset population. RBI instead calculates a probability and consequence of failure for each equipment item and ranks them by risk.
Probability of failure assessment considers active damage mechanisms — corrosion, fatigue, cracking — informed by process conditions, materials of construction, and inspection history.
Consequence of failure assessment considers the safety, environmental, and financial impact of a loss of containment at that equipment item, often using simplified consequence modelling.
The resulting risk ranking allows inspection budgets and turnaround scope to focus on genuinely high-risk equipment, while potentially extending intervals on low-risk items — improving both safety outcomes and inspection economics.