Titanium alloy Ti-6AI-4V ELI is selected for a high-pressure drilling riser application due to its high specific strength, corrosion resistance, and favorable elastic properties. The qualification of this titanium alloy requires assessing its resistance to hydrogen embrittlement and stress corrosion cracking due to seawater with/without cathodic protection, evaluating its wear resistance against a rotating steel drill string, and studying the influence of service-induced defects on fatigue and crack growth behavior when subjected to the operating environment. The paper presents an overview of the design requirements for a titanium drilling riser, and the material properties of the Ti-6AI-4V ELI alloy proposed for this application. The paper also highlights recent efforts to merge titanium and composite technologies to develop cost-effective drilling risers. [S0892-7219(00)01001-3]

Sauer, C. W., Sexton, J. B., Sokoll, R. E., Thornton, J. M., and Watkin, B., 1996, “Heidrun TLP Titanium Drilling Riser System,” Proceedings of the Offshore Technology Conference, OTC No. 8088, SPE.
Lobb, A. E., Lindh, D. V., Wahlin, B. M., and Lovell, D. T., 1972, “SST Technology Follow on Program, Phase I-Titanium Alloy Welding,” Report No. FAA-SS-72-09, Chap. 8, Federal Aviation Administration, Supersonic Transport Office, Washington, DC.
BSI, 1991, PD 6493, “Guidance on Some Methods for the Derivation of Acceptance Levels for Defects in Fusion Welded Joints,” British Standards Institution.
Donachie, M., 1988, “Titanium—A Technical Guide,” ASM Publication, ASM International.
Farg, T. E., Craig, B. D., and Aldrich, C. S., 1993, “Degradation of Titanium Drillpipe from Corrosion and Wear,” SPE Drilling and Completion, June, p. 105.
Salama, M. M., Murali, J., Baldwin, D. D., Jahnsen, O., and Meland, T., 1999, “Design Consideration for Composite Drilling Riser,” Proceedings of the Offshore Technology Conference, Paper No. OTC 11006, SPE, May 3–6, Houston, TX.
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