In ultra deepwaters, helical tensile armour wires under certain loading conditions may exhibit localized deflection in either the radial (out-of-plane) or lateral (in-plane) direction when subjected to significant high axial compression and bending. This phenomenon is often referred to as birdcage buckling. This paper presents the development of a total strain energy approach for modeling the buckling and post-buckling behaviour of these wires and for illustrating the characteristics of such behaviors. The paper presents the summary of the full scale offshore (Deepwater Immersion) DIP tests performed by Wellstream to date, all of which have been successful in resisting the failure modes. In addition, the results of pressure chamber tests are also presented and discussed, especially some of the key test constraints which can have a significant influence on the final result as observed on a recent 10-inch structure chamber test. The presented model provides a tool to define and implement the design criterions against such failure modes. The further validation of the model through comprehensive tests is planned, which is critical to ensure the ability to economically design and optimize flexible pipe structures to prevent this phenomenon, and to facilitate more cost effective products that meet the ultra deepwater design challenges.
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25th International Conference on Offshore Mechanics and Arctic Engineering
June 4–9, 2006
Hamburg, Germany
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-4749-7
PROCEEDINGS PAPER
Behavior of Tensile Wires in Unbonded Flexible Pipe Under Compression and Design Optimization for Prevention
Zhimin Tan,
Zhimin Tan
Wellstream International, Ltd., Houston, TX
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Cobie Loper,
Cobie Loper
Wellstream International, Ltd., Houston, TX
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Terry Sheldrake,
Terry Sheldrake
Wellstream International, Ltd., Newcastle, UK
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George Karabelas
George Karabelas
Wellstream International, Ltd., Newcastle, UK
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Zhimin Tan
Wellstream International, Ltd., Houston, TX
Cobie Loper
Wellstream International, Ltd., Houston, TX
Terry Sheldrake
Wellstream International, Ltd., Newcastle, UK
George Karabelas
Wellstream International, Ltd., Newcastle, UK
Paper No:
OMAE2006-92050, pp. 43-50; 8 pages
Published Online:
October 2, 2008
Citation
Tan, Z, Loper, C, Sheldrake, T, & Karabelas, G. "Behavior of Tensile Wires in Unbonded Flexible Pipe Under Compression and Design Optimization for Prevention." Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering. Volume 4: Terry Jones Pipeline Technology; Ocean Space Utilization; CFD and VIV Symposium. Hamburg, Germany. June 4–9, 2006. pp. 43-50. ASME. https://doi.org/10.1115/OMAE2006-92050
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