This work focuses on a methodology to predict the fatigue life of flexible pipes with wires broken in their tensile armors. Initially, the mechanical behavior of these pipes is discussed. Relying on this discussion, a simple set of equations is proposed in order to calculate the stresses in the armors of these pipes. These equations employ pre-estimated linear coefficients to convert forces and moments that act on the pope into stresses. These stresses are then processed by well-known cycle counting methods and S-N curves are finally used to evaluate fatigue damage at several points in the pipe’s cross section. The use of this methodology is exemplified by the assessment of the fatigue life of a 6” flexible pipe in which 0 up to 5 wires of its outer tensile armor are broken. The results indicate a substantial reduction in the fatigue life of the pipe with the increasing number of wires broken.
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ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
July 1–6, 2012
Rio de Janeiro, Brazil
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4490-8
PROCEEDINGS PAPER
Fatigue Analysis of a 6” Flexible Pipe With Broken Tensile Armor Wires
José R. M. de Sousa,
José R. M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Fernando J. M. de Sousa,
Fernando J. M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Marcos Q. de Siqueira,
Marcos Q. de Siqueira
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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Luís V. S. Sagrilo,
Luís V. S. Sagrilo
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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George Campello,
George Campello
Petrobras, Rio de Janeiro, RJ, Brazil
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Eduardo Vardaro,
Eduardo Vardaro
Petrobras, Rio de Janeiro, RJ, Brazil
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Carlos A. D. de Lemos
Carlos A. D. de Lemos
Petrobras, Rio de Janeiro, RJ, Brazil
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José R. M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Fernando J. M. de Sousa
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Marcos Q. de Siqueira
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Luís V. S. Sagrilo
Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
George Campello
Petrobras, Rio de Janeiro, RJ, Brazil
Eduardo Vardaro
Petrobras, Rio de Janeiro, RJ, Brazil
Carlos A. D. de Lemos
Petrobras, Rio de Janeiro, RJ, Brazil
Paper No:
OMAE2012-83532, pp. 445-457; 13 pages
Published Online:
August 23, 2013
Citation
de Sousa, JRM, de Sousa, FJM, de Siqueira, MQ, Sagrilo, LVS, Campello, G, Vardaro, E, & de Lemos, CAD. "Fatigue Analysis of a 6” Flexible Pipe With Broken Tensile Armor Wires." Proceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. Volume 3: Pipeline and Riser Technology. Rio de Janeiro, Brazil. July 1–6, 2012. pp. 445-457. ASME. https://doi.org/10.1115/OMAE2012-83532
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