Effect of Various Mooring Materials on Hydrodynamic Responses of Turret-Moored FPSO with Emphasis on Intact and Damaged Conditions

Abstract

The behavior of different mooring line materials has a significant influence on the behavior of the mooring system and, consequently, the dynamic responses of the floating platform. Although there have been previous studies on FPSOs and their mooring systems, the influence of mooring line failure scenarios associated with different mooring materials has received less attention, particularly for turret-moored FPSOs with taut moorings. Thus, this paper investigates the behavior of different mooring line materials in intact, single-line, and double-line damaged conditions on the hydrodynamic responses of the FPSO, restoring behavior, mooring, and riser tensions considering wave conditions in the Gulf of Mexico. Mooring lines including Aramid, HMPE, polyester, and steel wire were considered in the middle segment, which was the segment of interest in this study. The restoring forces of the mooring system were found to increase with increasing mooring stiffness, and a higher stiffness resulted in a higher loss of restoring force in the case of single-line failure. In all cases, the submerged weight and material stiffness had a significant influence on dynamic responses, mooring tension, transient responses, riser tension, and especially on the ability of the mooring system to resist the case of single-line failure. Each material was observed to behave differently in each degree of freedom (DOF), showing the necessity to pay close attention to the selection of mooring material for specific objectives.

Sensitivity of Dynamic Response of Truss-Type Aquaculture Platform to Floating Body Arrangement

“…Rudman and Cleary [25] introduced the time domain analysis method to work out the mooring force of the mooring lines of floating structures and studied the dynamic response. Ja et al [26] found that the material properties of the mooring system have a remarkable effect on the behavior of the mooring system, and that the restoring force of the mooring system increases with the increase in the mooring stiffness. Duan et al [27] built a fully coupled dynamic analysis model for the mooring system of an underwater production platform and analyzed its coupling effect, dynamic response characteristics, and safety risks; they found that its dynamic response to internal solitary waves had the significant characteristics of surge and heave motion, and that its mooring tension fluctuated significantly.…”

Review on Fixed and Floating Offshore Structures. Part II: Sustainable Design Approaches and Project Management

“…One of the most obvious of these applications is offshore oil production, which presents a substantial challenge to the product designer or offshore engineer [81][82][83]. Environmental loadings [84][85][86][87][88], hydrodynamics [89][90][91][92][93][94][95][96], hydroelasticity [97], corrosion [98], failure analysis [99], ocean wave mechanics [100][101][102][103][104][105][106][107][108], fluid content loadings [109][110][111][112][113][114][115], fatigue limits [116][117][118][119][120], reliability [121][122][123][124][125][126][127][128], and so on are all factors to consider ...…”

Scientometric Review and Thematic Areas for the Research Trends on Marine Hoses

“…However, important aspects of SPMs are their integrity management, life extension and reliability [100][101][102][103][104][105][106][107][108][109][110], mooring response, fluid-transfer mechanisms, and the response of the marine hoses at SPM terminals [100][101][102][103][104][105][106][107][108][109][110]. Another challenging area of marine engineering is failure modes of marine hoses and the installation of conduits such as pipelines, submarine hoses, umbilicals, and subsea marine risers [111][112][113][114][115][116][117][118][119][120][121]. Hence, there is a need to study the research patterns and advances made in this area as part of a systematic or scientific review.…”