Based on hundreds of design reviews, here are frequent mistakes when applying DNV-RP-F118:

| Pitfall | Consequence | Solution | |---------|-------------|----------| | Using 1-year instead of 100-year current for VIV | Under-predicted fatigue, risk of through-wall crack | Always check VIV for extreme current, even if probability is low. | | Ignoring installation fatigue | Cracks occur before riser enters service | Run installation analysis with actual vessel RAO and weather delays. | | Mixing safety factors from API and DNV | Inconsistent reliability index | Stick strictly to F118 factors for all limit states. | | Forgetting splash zone corrosion | Localized wall loss, pitting | Add 3–6 mm corrosion allowance in splash zone + CRA cladding. | | No interference check for mooring lines | Chafing and rupture | Use F118 interference criteria (minimum gap + accidental clash simulation). |

The RP organizes integrity management into five interconnected pillars, each with specific requirements:

This article is for informational purposes. Always consult the latest official DNV documents and qualified engineers for actual design decisions.