ABSTRACT:

Off late, nontraditional structures and concepts are being explored for use in offshore industry. Experiments were carried out on a 1:45 nonship shaped FPSO model. The main objective of the model test was to study the response of the vessel (heave and pitch) under regular and random waves. The vessel was tested for three different mooring configurations. Tests were also conducted on models with and without damping plates. In the present paper, the effect of mooring configurations in the heave response of the FPSO and the effect of damping plates in the heave and pitch responses of the FPSO under regular waves have been presented. Salient features of the details of the experiments carried out are also included.

INTRODUCTION

Floating, Production, Storage and Offloading systems (FPSO) are increasingly competitive to the traditional deepwater production solutions, e.g., SPAR, TLP and semi submersible in the current offshore oil and gas environment. Traditional solutions do not have onsite storage and rely on transport of crude via pipelines, whereas FPSO with its in-house storage uses offloading of the crude oil to a shuttle tanker. It is a great benefit and truly a cost and time effective to use FPSO in remote areas when new oil is discovered. Some of the ship shaped FPSO have a turret buoy system. During inclement weather conditions the vessel is disconnected from the system and re-connected back during favorable weather conditions for production operations. These operations of disconnecting and reconnecting involve lots of time, and interrupts in the production of oil and gas. Several researchers have studied the dynamic characteristics of ship shaped FPSO in winds and currents. Fernandes and Rossi (2005) studied the response of FPSO moored using linear spring lines and distorted polyester lines under regular and random waves.

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