Analysis and design of deep-water riser arrays requires that both collision frequency and resulting stresses in the pipes are addressed. Within a probabilistic context, the joint modeling of the current magnitude and surface floater motions must be taken into account. The present paper gives an outline of the general analysis setup, and response statistics obtained as a result of time domain simulations are described. Utilization of the analysis is also discussed in relation to estimation of extreme response and fatigue lifetime. As an example of application, a specific Spar buoy riser configuration at a water depth of 900m is considered.
Issue Section:
Technical Papers
1.
Søreide, T., Amdahl, J., Eberg, E., Holma˚s, T. and Hellan, O̸., 1988, “Ultimate Strength of Offshore Structures, Theory Manual,” SINTEF Report F88038.
2.
Sagatun, S. I., Herfjord, K., and Holma˚s, T., “Dynamic Simulation of Marine Risers Moving Relative to Each Other due to Vortex and Wake Effects,” J. Fluids Struct., (to appear).
Copyright © 2002
by ASME
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