Day 1 — Fundamentals of Fatigue in Offshore Structures

1. Introduction to Fatigue in Marine and Offshore Environments

• Offshore loading conditions: waves, wind, currents, vortex shedding
• Fatigue in welded joints and critical details
• Failure modes in jackets, topsides, FPSOs, risers, moorings, and subsea components
• Corrosion and marine growth influence

2. Stress Concentration and Welded Joint Behavior

• Stress concentration factors in offshore structures
• Residual stresses from welding
• S–N curves and material behavior
• Environmental effects: seawater corrosion, cathodic protection, and coatings

3. Standards and Design Frameworks

• DNV, API, ISO, and IIW fatigue design rules
• Detail classification and fatigue categories
• Integrity management and inspection requirements

4. Case Studies — Fatigue Failures

• Examples of offshore structural cracking
• Root-cause analysis and lessons learned

Day 2 — Fatigue Life Improvement Techniques & Ultrasonic Peening

1. Overview of Fatigue Life Improvement Methods

• Weld toe grinding
• TIG dressing
• Shot peening
• Hammer peening
• Ultrasonic Impact Treatment (Ultrasonic Peening)

2. Ultrasonic Peening Treatment (UPT): Principles & Science

• Ultrasonic vibration and impact fundamentals
• Residual stress modification and compressive layer formation
• Weld toe geometry improvement and microstructure refinement
• Benefits in offshore environments

3. Application Procedures

• Equipment and operation
• New welds versus existing welds
• Accessibility challenges
• Safety, QA/QC, and documentation

4. Qualification & Certification

• IIW and DNV requirements
• Demonstrating improvement using measurements
• Integration into life extension plans

5. Practical Demonstration

• Simulated or live demonstration of ultrasonic peening
• Hands-on practice

Day 3 — Engineering Assessment, Life Extension & Carbon Footprint Impact

1. Engineering Assessment for Life Extension

• Fitness-for-Service concepts
• Fracture mechanics and crack growth modelling
• Remaining Useful Life (RUL) calculation
• Updated S–N curves after UPT

2. Structural Integrity Management (SIM)

• Inspection planning before and after UPT
• NDT and monitoring systems
• Long-term effectiveness evaluation

3. Carbon Footprint Reduction Through Life Extension

• Delaying structural replacement
• Emissions savings from extending asset life
• ESG alignment

4. Practical Examples & Case Studies

• Offshore wind monopiles
• FPSO decks
• Jack-up legs
• Tubular joints
• Quantified fatigue improvements (3×–10×)
• Cost–benefit and risk-based decision making

5. Group Exercise / Workshop

• Evaluate welded detail with loading history
• Perform fatigue life calculation before and after UPT
• Propose life-extension strategy and carbon savings