The Stress of Marine Riser on Jacket Structure

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2020 by IJETT Journal
Volume-68 Issue-5
Year of Publication : 2020
Authors : Iberahin Jusoh
  10.14445/22315381/IJETT-V68I5P205S

MLA 

MLA Style: Iberahin Jusoh "The Stress of Marine Riser on Jacket Structure" International Journal of Engineering Trends and Technology 68.4(2020):23-26. 

APA Style: Iberahin Jusoh. The Stress of Marine Riser on Jacket Structure  International Journal of Engineering Trends and Technology, 68(4),23-26.

Abstract
Marine riser is a very important part of the structure designed for offshore oil and gas recovery. It needs to be carefully analyzed to ensure that the pipes have acceptable levels of deformations, stresses, and fatigue life due to environmental loads. These environmental loads are from current waves and wind. In this paper, the responses of marine risers due to these loads were studied. The fixed type of vertical steel riser installed on a typical jacket structure exposed to a horizontal sea current and extreme Malaysian environment. Finite element program was utilized to determine the static and dynamic behavior of the marine riser structure. Estimation of wave forces, current and wind loads is derived from the Morrison equation. The study shows that the riser is sensitive to variation in riser diameter and wave height. The maximum deformation at the mid-span of the riser is found to be 190 mm and maximum stress within the riser is 108 MPa.

Reference

[1] Tilbe J.R. and Van der Horst, G., ―Riser: Key cause of North Sea downtime‖. Proceeding of Offshore Platforms and Pipelines Conference, Tulsa, 1976.
[2] Dawson, T.H., ―Offshore Structural Engineering‖. Prentice-Hall, Inc. 1983
[3] Patel, M.H. and Lyons, G.J., ―Marine Risers and Pipelines”. Marine Technology Reference Book. Butterworth & Co. (Publishers) Ltd, 1990.
[4] Patel, M.H., Sarohia, S. and Ng, K.F., ―Finite-element analysis of the marine riser‖. Engineering Structures, Vol. 6, Issue 3, Elsevier, July 1984.
[5] Joseph, R.S., Wang, J., Ong, M.C. and Jakobsen, J.B., ―Vortex-induced vibration (VIV) effects of a drilling riser due to vessel motion‖ First Conference of Computational Methods in Offshore Technology (COTech2017) IOP Publishing IOP Conf. Series: Materials Science and Engineering, 2017.
[6] Morison, J. R.; O'Brien, M. P.; Johnson, J. W.; Schaaf, S. A. (1950), "The force exerted by surface waves on piles", Petroleum Transactions, American Institute of Mining Engineers, 189: 149–154
[7] Chakrabarti, S. K., ―Hydrodynamics of offshore structures”, Computational Mechanics Publications. London, 1994.
[8] Jusoh, I., ―Environmental loading conditions and response of an offshore structure‖. Journal of the Institution of Engineers, Malaysia, 1999.
[9] Niedzwecki, J.M., ―Riser Interference: A combined time/frequency domain approach‖, Ocean Engineering. 2002

Keywords
marine riser, hydrodynamics load, riser deformation, stresses, jacket structure.