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Evaluation of the Effect of Yield to Tensile (Y/T) Ratio on the Structural Integrity of Offshore Pipeline by Limit State Design Approach

[+] Author Affiliations
Gianluca Mannucci, Giuliano Malatesta, Giuseppe Demofonti

Centro Sviluppo Materiali S.p.A., Rome, Italy

Marco Tivelli

Tenaris Siderca, Campana, Buenos Aires, Argentina

Hector Quintanilla, Alfonso Izquierdo

TenarisTamsa R&D, Veracruz, Mexico

Giuseppe Cumino

TenarisDalmine, Dalmine, BG, Italy

Paper No. IPC2006-10124, pp. 957-963; 7 pages
  • 2006 International Pipeline Conference
  • Volume 3: Materials and Joining; Pipeline Automation and Measurement; Risk and Reliability, Parts A and B
  • Calgary, Alberta, Canada, September 25–29, 2006
  • Conference Sponsors: Pipeline Division
  • ISBN: 0-7918-4263-0
  • Copyright © 2006 by ASME


Nowadays specifications require strict Yield to Tensile ratio limitation, nevertheless a fully accepted engineering assessment of its influence on pipeline integrity is still lacking. Probabilistic analysis based on structural reliability approach (Limit State Design, LSD) aimed at quantifying the yield to tensile strength ratio (Y/T) influence on failure probabilities of offshore pipelines was made. In particular, Tenaris seamless pipe data were used as input for the probabilistic failure analysis. The LSD approach has been applied to two actual deepwater design cases that have been on purpose selected, and the most relevant failure modes have been considered. Main result of the work is that the quantitative effect of the Y/T ratio on failure probabilities of a deepwater pipeline resulted not so big as expected; it has a minor effect, especially when Y only governs failure modes.

Copyright © 2006 by ASME



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