scope:

This recommended practice gives methods for fatigue analyses based on S-N data from testing for the following steel structures and components:

- Fixed and floating steel structures used for exploitation and for production of oil and gas

- Risers and pipelines

- Support structures for wind turbines

- Different types of welded connections

- Cast and forged joints

- Bolted connections

- Connectors

- Small diameter umbilicals made of super duplex steel.

The document specifies and gives guidelines for:

- S-N data in air environment, seawater with cathodic protection and seawater with free corrosion

- stress concentration factors for some details where these can be derived from analytical considerations or from detailed finite element analysis

- simplified fatigue design based on allowable stress ranges for various S-N data and Weibull long-term stress distributions

- the use of various design methods based on nominal stress, hot spot stress or notch stress

- post weld improvement such as grinding, TIG dressing and hammer peening.