The Dynamics Of Deepwater Offloading Buoys
Author(s)
A. Duggal & S. Ryu
Abstract
Deepwater offloading buoys are being used in West Africa to allow efficient
loading of spread-moored FPSOs. These buoys have a relatively small
displacement when compared to other floating systems, with the majority of the
displacement being used to support the mooring system and the oil offloading
lines. This results in a floating system that has a very active response to the
environment, coupled with feedback from the mooring and flowline systems.
This wave frequency dominant motion behaviour has been shown to result in
severe fatigue damage to the mooring and flowline components, and thus must
be estimated accurately to ensure that the system is designed with sufficient
fatigue life.
This paper presents results from time- and frequency-domain simulations of
the offloading buoy system to demonstrate its response characteristics. The
results and comparisons demonstrate the importance of accounting for the
coupling between the mooring and flowline system, and the buoy hull in
predicting the system response. Results from sensitivity studies are also
presented to show the relative importance of the mooring and flowline system
mass, stiffness and damping contributions to the system response, and thus the
fatigue life of the various components. The response of the buoy with an
offloading tanker connected is also presented and compared to that of the buoy
alone.
Keywords: fluid-structure interaction, coupled analysis, offloading buoy, FPSO,
floating platform.
1 Introduction
Deepwater offloading buoys are being utilized in West Africa to provide large,
spread-moored FPSOs with the desired offloading operability. These offloading
Keywords
fluid-structure interaction, coupled analysis, offloading buoy, FPSO,
floating platform.
Related Book
Other papers in this volume
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