Deep-water tendon and riser systems are often subjected to severe fatigue loading from waves, currents and vessel movements. For very deep-water and harsh environments it becomes challenging to document the fatigue performance of girth welds and often additional cost-effective measures like additional wall thickness or buoyancy must be taken.
The joint industry project (JIP) will build on the results of the Girth Weld JIP run from 2011-2015 where more than 1700 full-scale data were analysed for a single-slope S-N curve with m=3. Data analytics will be used to assess and better understand fatigue performance and to identify trends, dependencies and critical features that influence the fatigue performance.
The goal is to have a trained analytical model that can predict more accurately the fatigue performance of girth welds covering both the fatigue initiation and the propagation phase.
- An increase in the design window for use of steel catenary risers and fatigue sensitive pipelines
- Use of steel risers instead of more expensive solutions as flexible risers
- Limiting or removing the need for expensive buoyancy elements by allowing for a catenary shape instead of a lazy wave configuration.