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New Techniques for Integrity Management of Flexible Riser-End Fitting Connection

[+] Author Affiliations
Mauro G. Marinho, Claudio S. Camerini, Sergio R. Morikawa, Daniel R. Pipa, Gustavo P. Pires, João M. Santos, Agildo B. Moreira

PETROBRAS, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2008-57929, pp. 643-648; 6 pages
doi:10.1115/OMAE2008-57929
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

As the operation water depth for flexible risers increases, the stress level in these structures also increases. This higher load, associated with stress concentration close to end fitting, can induce fatigue damage in tensile armors at riser top section. Progressive rupture of wires due to fatigue, which may be accelerated by corrosion, is an important indication of deterioration in riser-end fitting connection, and has become a typical failure mechanism for flexible riser top section. In order to mitigate the progression of these damages, apart from the inspection program and the surface monitoring procedures already implemented, techniques for the early detection of failure mechanisms at the riser-end fitting connection, specially at the tensile armors, are under development. This paper describes and evaluates these techniques, such as visual torsion monitoring, detection through acoustic emission of tensile armor wire rupture, electromagnetic tensile armor stress measurement and monitoring through optical fiber sensor extensometers, as well as reports the results obtained from field experience.

Copyright © 2008 by ASME

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