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Global and local fatigue analysis of X100 and X60 steel catenary riser girth welds

Global and local fatigue analysis of X100 and X60 steel catenary riser girth welds AbstractThe use of steel catenary risers in offshore oil and gas production has increased significantly in recent years, in particular for deepwater applications. This paper presents a detailed assessment approach with respect to welded steel catenary risers, to reduce the requirement for over conservative factors of safety. The paper presents a global–local finite element modelling approach, with the Flexcom offshore dynamic analysis package used to determine the global load quantities for two ultra-deepwater free hanging steel catenary risers. These results act as stress boundary conditions in a local model using Abaqus, focusing on the failure susceptible regions of a girth weld. The methodology accounts for geometrical discontinuities of the weld and the different mechanical properties of the parent material, weld metal and heat affected zone, which result in fatigue hotspots for dynamic structures such as steel catenary risers. Two line pipe steels, a current generation X60 and a next generation X100, are investigated in the local analysis. Two pipe wall thicknesses are examined, with the weld geometry being different for each. It is shown that weld detail can lead to significantly different stress concentrations. X100 is shown to be superior to X60 with respect to yielding and fatigue. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Integrity and Maintenance Taylor & Francis

Global and local fatigue analysis of X100 and X60 steel catenary riser girth welds

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Global and local fatigue analysis of X100 and X60 steel catenary riser girth welds

Abstract

AbstractThe use of steel catenary risers in offshore oil and gas production has increased significantly in recent years, in particular for deepwater applications. This paper presents a detailed assessment approach with respect to welded steel catenary risers, to reduce the requirement for over conservative factors of safety. The paper presents a global–local finite element modelling approach, with the Flexcom offshore dynamic analysis package used to determine the global load quantities...
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Publisher
Taylor & Francis
Copyright
© 2017 Korea Institute for Structural Maintenance and Inspection
ISSN
2470-5322
eISSN
2470-5314
DOI
10.1080/24705314.2017.1354155
Publisher site
See Article on Publisher Site

Abstract

AbstractThe use of steel catenary risers in offshore oil and gas production has increased significantly in recent years, in particular for deepwater applications. This paper presents a detailed assessment approach with respect to welded steel catenary risers, to reduce the requirement for over conservative factors of safety. The paper presents a global–local finite element modelling approach, with the Flexcom offshore dynamic analysis package used to determine the global load quantities for two ultra-deepwater free hanging steel catenary risers. These results act as stress boundary conditions in a local model using Abaqus, focusing on the failure susceptible regions of a girth weld. The methodology accounts for geometrical discontinuities of the weld and the different mechanical properties of the parent material, weld metal and heat affected zone, which result in fatigue hotspots for dynamic structures such as steel catenary risers. Two line pipe steels, a current generation X60 and a next generation X100, are investigated in the local analysis. Two pipe wall thicknesses are examined, with the weld geometry being different for each. It is shown that weld detail can lead to significantly different stress concentrations. X100 is shown to be superior to X60 with respect to yielding and fatigue.

Journal

Journal of Structural Integrity and Maintenance – Taylor & Francis

Published: Jul 3, 2017

Keywords: Weld; steel catenary riser; fatigue; energy; structure; offshore

References

  • Deepwater steel catenary risers require attention to fatigue factors
  • Environmental effects of the deepwater horizon oil spill: A review
  • An improved equation relating hardness to ultimate strength
  • On the fatigue of steel catenary risers
  • Multiaxial fatigue and failure analysis of helical compression springs
  • High temperature, low cycle fatigue characterization of P91 weld and heat affected zone material
  • Production and inspection issues for steel catenary riser welds
  • Cyclic plasticity of welded P91 material for simple and complex power plant connections
  • An investigation of the fatigue performance of riser girth welds
  • Today in energy – Offshore oil production in deepwater and ultra-deepwater is increasing
  • Fatigue performance of pre-strained pipes with girth weld defects: Local deformation mechanisms under bending
  • Frontier deepwater developments – The impact on riser systems design in water depths greater than 3,000 m
  • Micromechanical methodology for fatigue in cardiovascular stents
  • fatigue reliability for offshore structures
  • Estimation of the local mechanical properties of pipeline steels and welded joints by use of the microshear test method