Standards › Fatigue
DNV-RP-C203
Fatigue design of offshore steel structures
This page describes fatigue design of offshore steel structures and the associated engineering assessment topics. Project use requires qualified inputs and engineering review.
Assessment topics
- Pick the correct S-N curve for a detail (in air, seawater with or without cathodic protection) and estimate fatigue damage from a stress history.
- Apply stress-concentration and thickness corrections and report the governing detail.
- Compare a detail against DNV-RP-C203, API RP 2A and BS 7608 side by side.
Related standards
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Questions
What does DNV-RP-C203 cover?
It is the recommended practice for fatigue design of offshore steel structures — S-N curves for welded, base-material and bolted details, stress-concentration factors, thickness effect, and the environment classes (air, seawater with and without cathodic protection).
Which S-N curve should I use?
The curve depends on the detail geometry, the loading direction, the environment, and whether the weld is ground or as-welded.
Can you compare fatigue across standards?
Yes — the same stress history can be assessed by DNV-RP-C203, API RP 2A-WSD or BS 7608 and the results shown together, so you can see how the governing curve changes.
Discuss a DNV-RP-C203 assessment
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