Part 1: Introduction to Fitness-For-Service for Offshore Pipelines

• Definition, objectives, and value of FFS

• Difference between design codes, inspection codes, and FFS

• Key damage mechanisms in subsea pipelines

• FFS Assessment Levels – Core Philosophy

o Level 1: Screening / conservative methods (minimal data, rapid assessment)

o Level 2: Intermediate methods (more accurate, moderate data requirements)

o Level 3: Detailed / advanced methods (FEA, highest accuracy, extensive data)

• When and how to select the appropriate Level

• Decision flow: Level 1 → Level 2 → Level 3

Part 2: Relevant Codes and Standards

• DNVGL-RP-F101 (Part A and Part B)

• ASME B31G and Modified B31G

• API 579-1 / ASME FFS-1

Part 3: Data Requirements and Inspection Inputs

• ILI technologies (MFL, caliper) and ROV/AUV data

• Material properties, design data, and operating history

• Measurement uncertainty and confidence levels

• Data quality requirements for Level 1, Level 2, and Level 3 assessments

Part 4: Assessment of General and Local Metal Loss

• DNVGL -RP-F101 (Part A and Part B)

• API 579 Parts 4 & 5

• ASME B31G / Modified B31G procedures

• Level 1, Level 2, and Level 3 approaches for metal loss

• Interaction of multiple corrosion defects

• Method selection, ERF calculation and comparison for subsea pipelines

Part 5: Pitting and Complex Corrosion Damage

• API 579 Part 6 (Pitting Corrosion)

Part 6: Mechanical Damage – Dents, Gouges, and Combinations

• API 579 Part 12 (Dents and Gouges)

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Part 7: Level 3 Assessments and Advanced Methods

• When Level 1 and Level 2 are insufficient

• Finite Element Analysis (FEA) requirements and best practices

• Nonlinear material models, large deformation, and contact

• Validation, sensitivity studies, and acceptance criteria

• Transition from Level 2 to full Level 3 analysis

Part 8: Remaining Life, Risk, and Decision Making

• Corrosion growth rate determination and projection

• Remaining life calculation linked to Level 1 / 2 / 3 results

• Recommendation for repair report (RRR)

• Re-inspection intervals, pressure derating, repair, or replacement decisions

• Documentation and reporting requirements