This DNV GL recommended practice provides methods for fatigue analysis based on S-N data from testing. It covers fixed and floating steel structures for oil and gas production, risers and pipelines, wind turbine support structures, welded connections, cast and forged joints, bolted connections, connectors, and small-diameter super duplex steel umbilicals.
The document addresses fatigue assessment using nominal stress, hot spot stress, and notch stress methods. It includes guidance on S-N data for air and seawater environments, stress concentration factors, simplified fatigue design, finite element analysis, fracture mechanics, weld improvement methods, extended fatigue life, and uncertainty in fatigue life predictions. This edition was issued in September 2019 and amended in January 2020.
Application Scope: Fatigue design and assessment of offshore steel structures and components, including oil and gas facilities, risers, pipelines, wind turbine support structures, welded and bolted connections, and connectors.
