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Fatigue Resistant Threaded and Coupled Connectors: The New Standard for Deep Water Riser Applications

[+] Author Affiliations
Celine Sches, Etienne Lepine

Vallourec & Mannesmann Tubes, Aulnoye-Aymeries, France

Joe W. Hill, Jacky Massaglia

Vallourec & Mannesmann Tubes, Houston, TX

Thomas Peter

Vallourec & Mannesmann Tubes, Boulogne, France

Paper No. OMAE2007-29263, pp. 285-295; 11 pages
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4267-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME


In the past decade, premium threaded and coupled (T&C) connectors were developed for top tension riser applications (TTR). Compared to weld-on connectors, the benefit of such T&C risers is that, thanks to the use of high strength material (up to 125 ksi in yield), significant weight savings can be achieved on the full riser system and consequently on the platform or the floating unit. This is essential at the time when the offshore oil production goes deeper and deeper. Corresponding developments can concern full product lines, where the design and the performance are homogeneous regardless of the pipe diameter, thickness or grade. There can also be fit for purpose developments when specific material, fatigue or sealing performance is required. After years of varied developments, the outcome is several concepts concerning effective fatigue enhancement techniques and premium fatigue compliant sealing devices. These concepts are derived from a rigorous design and qualification process, supported by a huge quantity of full scale tests on connectors, material characterization tests, and the continuous improvement of our assessment techniques. Based on development capability and TTR experience from the field, premium T&C risers can be considered the standard versus weld-on. Continued development and testing could make this a viable solution for xHPHT, flow lines, and steel catenary riser applications.

Copyright © 2007 by ASME



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