Suspending pipelines between two points over an uneven seafloor is called free-spanning which induces more vortices behind the pipe especially when the pipelines are exposed to the hydrodynamic effects of waves and currents. These influences cause a significant increase in the dynamic acting drag forces. In fact, the oscillatory acting drag forces, as a result of changes in the net pressure and velocity filed around the pipeline, increase the probability of fatigue damage. Since the fatigue life of offshore pipelines has a major influence on the useful life of a project, studying it for offshore pipelines laid on uneven sea beds has become very important. Both the consequence of vortex shedding as a result of wave and current interaction with the pipeline, and the selected suitable approach in assessing fatigue damage has made the design process sophisticated. In the present study, it is attempted to employ a proper finite element model with the capability of coupling the dynamic drag forces induced by wave and current conditions with estimating cumulative fatigue damage methods. The wave profile is simulated using Non-deterministic Spectral Amplitude in Gaussian sea state and using linear wave formulation to calculate wave -induced forces. Moreover, the current force is estimated by using the conventional Morison Equation as well as employing a new approach of estimating current -induced dynamic drag forces obtained by a numerical model that includes the VIV effects. Finally cumulative fatigue damage as a result of acting those forces is investigated for various conditions of laying pipeline on the seabed.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4818-0
PROCEEDINGS PAPER
Wave and Current Induced Cumulative Fatigue Damage Assessment for Offshore Pipeline on Free-Span
Ali Valipour,
Ali Valipour
Iran University of Science and Technology, Tehran, Iran
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Mehrdad Zoroufi,
Mehrdad Zoroufi
Iran University of Science and Technology, Tehran, Iran
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Abbas Yeganeh Bakhtiary,
Abbas Yeganeh Bakhtiary
Iran University of Science and Technology, Tehran, Iran
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Reza Valipour
Reza Valipour
Iran University of Science and Technology, Tehran, Iran
Search for other works by this author on:
Ali Valipour
Iran University of Science and Technology, Tehran, Iran
Mehrdad Zoroufi
Iran University of Science and Technology, Tehran, Iran
Abbas Yeganeh Bakhtiary
Iran University of Science and Technology, Tehran, Iran
Reza Valipour
Iran University of Science and Technology, Tehran, Iran
Paper No:
OMAE2008-57317, pp. 293-299; 7 pages
Published Online:
July 27, 2009
Citation
Valipour, A, Zoroufi, M, Yeganeh Bakhtiary, A, & Valipour, R. "Wave and Current Induced Cumulative Fatigue Damage Assessment for Offshore Pipeline on Free-Span." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology. Estoril, Portugal. June 15–20, 2008. pp. 293-299. ASME. https://doi.org/10.1115/OMAE2008-57317
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