Use of an Irregular Cone to Reduce Ice-Induced Vibration of a Vertical Riser Pipe
Publication: Journal of Cold Regions Engineering
Volume 33, Issue 1
Abstract
A vertical riser pipe is often mounted on the leg of an offshore platform to transport oil and gas. However, severe ice-induced vibrations and low-cycle fatigue damage of welded joints have been observed on the outside vertical riser of a platform when ice sheets interact with the riser in the Bohai Sea. In this study, an irregular cone is first proposed and mounted on the platform to decrease ice-induced vibrations. The vibration responses and the numerical analysis of the riser are then measured and simulated, respectively. The observed data and security analysis indicate that the stress amplitude of the welded joints on the riser structure compromises the endurance limit on fatigue damage. The security of the riser structure is found to be substantially stronger after mounting the irregular cone, thus providing a reference design for outside riser structures to reduce ice-induced vibrations.
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Acknowledgments
The support of the Natural Science Fund of Henan Province (No. 162300410320) is much appreciated. The authors are also grateful to the China National Offshore Oil Corporation (CNOOC) for their support in the field tests. The kind suggestions and comments from the reviewers are similarly appreciated.
References
API (American Petroleum Institute). 2000. Recommended practice for planning, designing and constructing fixed offshore platforms—Working stress design. RP 2A. Washington, DC: API Publishing Services.
Blenkarn, K. A. 1970. “Measurement and analysis of ice forces on Cook Inlet structures.” In Vol. 2 of Proc., 2nd Offshore Technology Conf., 365–378. Tulsa, OK: American Association of Petroleum Geologists.
Engelbrektson, A. 1977. “Dynamic ice loads on lighthouse structures.” In Vol. 2 of Proc., 4th Int. Conf. on Port and Ocean Engineering under Arctic Conditions, 654–864. Ottawa: Institute for Marine Dynamics of the National Research Council Canada.
Lee, H. H. 1997. “Stochastic analysis for offshore structures with added mechanical dampers.” Ocean Eng. 24 (9): 817–834. https://doi.org/10.1016/S0029-8018(96)00039-X.
Li, G., X. Liu, Y. Liu, and Q. J. Yue. 2008. “Optimum design of ice-resistant offshore jacket platforms in the Bohai Gulf in consideration of fatigue life of tubular joints.” Ocean Eng. 35 (5–6): 484–493. https://doi.org/10.1016/j.oceaneng.2007.12.005.
Peyton, H. R. 1968. Sea ice forces. Ice pressures against structures. Technical Memorandum, 92, 117–123. Ottawa: National Research Council of Canada.
Qu, Y., Q. J. Yue, and X. J. Bi. 2001. “Ice-induced jacket structure vibrations in Bohai sea.” J. Cold Reg. Eng. 14 (2): 81–92. https://doi.org/10.1061/(ASCE)0887-381X(2000)14:2(81).
Qu, Y., Q. J. Yue, X. J. Bi, and T. Kärnä. 2006. “A random ice force model for narrow conical structures.” Cold Reg. Sci. Technol. 45 (3): 148–157. https://doi.org/10.1016/j.coldregions.2006.05.008.
Ralston, T. D. 1977. “Ice force design considerations for conical offshore structures”. In Proc., 4th Int. Conf. on Port and Ocean Engineering under Arctic Conditions, 741–752. Canada: Memorial Univ. of Newfoundland.
Sodhi, D. S. 1989. “Ice-structure interaction during indentation tests.” In Ice-structure interaction, edited by S. Jones, R. F. McKenna, J. Tillotson, and I. Jordaan, 619–640. St. Johns, Canada: Newfoundland.
Wang, S. Y., and Q. J. Yue. 2012. “Vibration reduction of bucket foundation platform with fixed ice-breaking cone in the Bohai Sea.” J. Cold Reg. Eng. 26 (4): 160–168. https://doi.org/10.1061/(ASCE)CR.1943-5495.0000042.
Wang, S. Y., Q. J. Yue, and D. Y. Zhang. 2013. “Ice-induced non-structure vibration reduction of jacket platforms with isolation cone system.” Ocean Eng. 70 (15): 118–123. https://doi.org/10.1016/j.oceaneng.2013.05.018.
Xu, N., Y. Qu, Q. J. Yue, X. J. Bi, and A. C. Palmer. 2009. “Main factors of ice sheet-conical structure interaction process based on field monitoring.” In Proc., 28th Int. Conf. on Ocean, Offshore and Arctic Engineering, 149–157. New York: ASME.
Yue, Q. J., F. W. Guo, and T. Kärnä. 2009. “Dynamic ice forces of slender vertical structures due to ice crushing.” Cold Reg. Sci. and Technol. 56 (2–3): 77–83. https://doi.org/10.1016/j.coldregions.2008.11.008.
Yue, Q. J., X. Zhang, X. J. Bi, and Z. M. Shi. 2001. “Measurements and analysis of ice induced steady state vibration.” In Proc., 16th Int. Conf. on Port Ocean Engineering under Arctic Conditions. Delft, Netherlands: Port and Ocean Engineering under Arctic Conditions.
Zhang, D. Y., and Q. J. Yue. 2011. “Major challenges of offshore platforms design for shallow water oil and gas field in moderate ice conditions.” Ocean Eng. 38 (10): 1220–1224. https://doi.org/10.1016/j.oceaneng.2011.05.012.
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Published In
Journal of Cold Regions Engineering
Volume 33 • Issue 1 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 7, 2017
Accepted: Aug 20, 2018
Published online: Dec 18, 2018
Published in print: Mar 1, 2019
Discussion open until: May 18, 2019
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