Abstract
The stability of FPSO or offloading shuttle tanker may be affected in wave conditions which excite parametric rolling. The offloading operations are thereby ceased and eventually leads to loss in production which affects the revenue of global production, better known as downtime cost. This paper discusses downtime cost analysis of offloading operations due to parametric rolling of shuttle tanker under regular waves in Malaysian waters for three different locations. The downtime due to parametric rolling is investigated for two different water depths for which the probability of occurrence was calculated from the location specific wave scatter diagram. The results of parametric rolling of shuttle tanker along with downtime cost charts are presented. Additionally, a Graphical User Interface (GUI) was developed and its work procedure is demonstrated in this paper. The down-time cost calculator will help the oil operator companies to analyze the economic risks involved for field developments and anticipate the loss in revenue for downtime occurrences. The developed GUI was copyrighted under literary work as intellectual property.
Highlights
The latest study on floating, production, storage and offloading (FPSO) systems disclosed a total of 178 FPSOs operating around the globe [1]
Since the shuttle tanker was found to experience parametric rolling in these two cases, the downtime cost analysis was performed under these conditions
A total downtime cost chart is presented by Graphical User Interface (GUI) where in the downtime cost is compared with respect to different percentage range of offloading capacity of shuttle tanker
Summary
The latest study on floating, production, storage and offloading (FPSO) systems disclosed a total of 178 FPSOs operating around the globe [1]. The possibility of large roll amplitudes under conditions of parametric roll was compared between a numerical model and experimental results for different roll damping cases. A coupled motion numerical model based on source method to study the diffraction and radiation forces on parametric roll was used in [9]. The past research paper have presented a procedure to calculate the roll response through a time domain numerical model [10]. The time domain numerical model was based on the exact underwater geometry which calculated the righting arm This method considered the roll angle and surge velocity for statically balancing the vessel. A partly non linear time domain numerical model was used for prediction of parametric roll resonance in regular waves. The non linear incident wave and hydrostatic restoring forces and moment are evaluated considering the instantaneous wetted surface area [15]
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