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.

Run it on Open Deck S-N fatigue calculator

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

DNV-RP-C203 API RP 2A-WSD BS 7608 S-N curves Miner's rule

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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

Open Deck is free — bring your numbers and check the result against your own methods.

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