A large diameter high strength titanium free-hanging catenary riser was evaluated by the Demo 2000 Ti-Rise project, from initiative of the Kristin Field development license. In order to reduce the uncertainties related to the schedule, cost, and special technical issues identified in the work related to a similar riser for future installation on the A˚sgard B semi-submersible platform, a fabrication qualification of a full scale riser in titanium was run. Several full-scale production girth welds were made in an in-situ fabrication environment. The welding was performed on extruded titanium grade 23 (ASTM) pipes with an ID of 25.5″) and wall thickness of 30 mm. The main challenge was to develop a highly productive TIG orbital welding procedure, which produced welds with as low pore content as possible. It is well known that sub-surface pores often are initiation sits for fatigue cracks in high strength titanium welds. This paper describes how a greatly improved productivity was obtained in combination with a high weld quality. NDT procedures were developed whit the main on the reliability to detect and locate possible sub-surface weld defects, volumetric defects such as pores and tungsten particles and planar defects such as lack of fusion. The results from the actual Non Destructive Testing (NDT), the mechanical testing, and the fatigue testing of the subjected welds are presented. The response of the catenary is optimised by varied distribution of weight coating along the riser’s length. A satisfactory weight coating with sufficient strength, bond strength, and wear properties was developed and qualified. The riser is planned to be fabricated from extruded titanium pipes, welded together onshore to one continuous piece. The field coating is added and the riser is loaded into the sea and towed offshore and installed.
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ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
June 23–28, 2002
Oslo, Norway
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3613-4
PROCEEDINGS PAPER
Cost Effective Fabrication of Large Diameter High Strength Titanium Catenary Riser
Agnes Marie Horn,
Agnes Marie Horn
Aker Kværner Technology AS, Oslo, Norway
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Per-Arne Ro̸stadsand,
Per-Arne Ro̸stadsand
Aker Technology AS
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Peer Dahlberg,
Peer Dahlberg
Corrocean AS, Sandvika, Norway
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Terje Fossesholm
Terje Fossesholm
Trelloborg Viking AS
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Agnes Marie Horn
Aker Kværner Technology AS, Oslo, Norway
Mons Hauge
Statoil, Trondheim, Norway
Per-Arne Ro̸stadsand
Aker Technology AS
Bjarne Bjo̸rnbakk
Vitec AS
Peer Dahlberg
Corrocean AS, Sandvika, Norway
Terje Fossesholm
Trelloborg Viking AS
Paper No:
OMAE2002-28445, pp. 331-337; 7 pages
Published Online:
February 24, 2009
Citation
Horn, AM, Hauge, M, Ro̸stadsand, P, Bjo̸rnbakk, B, Dahlberg, P, & Fossesholm, T. "Cost Effective Fabrication of Large Diameter High Strength Titanium Catenary Riser." Proceedings of the ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3. Oslo, Norway. June 23–28, 2002. pp. 331-337. ASME. https://doi.org/10.1115/OMAE2002-28445
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