Standards › Fatigue
DNV-RP-C203
Fatigue design of offshore steel structures
DNV-RP-C203 gives the S-N curves and stress-concentration guidance for fatigue design of welded and bolted offshore steel details. Ask Deckhand to run a check against the right curve and it returns the damage, the life, and the assumptions.
What you can ask it to do
- 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. Deckhand selects the curve from your detail description and states the choice so a checker can verify it.
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.
Run DNV-RP-C203 on your own inputs
Every capability is free to explore — open the published dataset behind the check and read the numbers yourself.
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