Steel catenary risers for deep water applications
- Escola Politecnica da Universidade de Sao Paulo (Brazil)
Steel catenary risers connected to floating production systems of semi-submersible type in deep water have been analyzed. Static and dynamic response calculation to extreme loading conditions as well fatigue life predictions indicate that, in many cases, a proper configuration can be found in order to comply with design criteria. This paper deals with design procedures and modeling, pointing out a number of uncertainties that deserve special consideration. In particular, dynamic bending stresses in the touch-down region are of special concern, as results from existing computer codes can be significantly affected by discretization and boundary conditions modeling. It has been found that slow-drift-oscillations of the vessel and wave frequency motions imposed to the top end of the riser are, in general, the primary cause of fatigue damage. Vortex induced vibrations can play a rule as well, depending on depth, current profile and geometrical properties of the riser.
- OSTI ID:
- 237931
- Report Number(s):
- CONF-950604--; ISBN 1-880653-18-4
- Country of Publication:
- United States
- Language:
- English
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