RBI

Module from the Inspection and NDE Curriculum curriculum.

Module 8 - Risk-Based Inspection (API 580/581) · Learning Objectives · 1. Apply API 580 qualitative or API 581 quantitative RBI approach · 2. Compute Risk = Probability of Failure (PF) x Consequence of Failure (CF) · 3. Classify equipment by risk matrix (High/Medium/Low) · 4. Extend inspection intervals where low-risk equipment supported · 5. Reassess risk after each inspection finding · API 581 Damage Factor Approach

Input	Description	Source	Default	Effect on PF	Notes
Generic failure frequency	Industry baseline	API 581 Part 1	1E-5/yr	Starting PF	Per size/type
Damage factor (DF)	Mechanism-specific	API 581 Part 2	Calc per mech	Multiplier	Main driver
Management systems factor (FMS)	Plant PSM maturity	API 581 Part 1	1.0 (average)	Multiplier 0.01-2	Good PSM reduces
Inspection effectiveness	NDE + coverage	API 581 Part 2	Usually A-E	Reduce DF	Best = A
Consequence of failure	Financial + safety	API 581 Part 3	Per release model	Drives scoring	$ + sq ft

Source: Inspection_NDE_Curriculum_v1.xlsx · Sheet: RBI

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