Sensitivity Study on SCR Design for Spread-Moored FPSO in West Africa

Yoo, Kwangkyu; Joo, Young-Seok

doi:10.5574/ksoe.2017.31.2.111

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Quéau et al [123] presented some sensitivity investigations on fatigue damage of SCR dynamic loads in the touchdown zone by utilising a simple stress range evaluation framework. To improve the certainty on the design of SCR attached to deep-water FPSOs, a sensitivity analysis is also conducted by Yoo & Joo [124] under 1,400 m water depth for deep water environment in West Africa. Thus, the need for the investigation on the hydrodynamic characteristics, the wave-current interaction with the sensitivity studies of the attached hoses, and comparing the designs for Lazy-S and Chinese-lantern configurations, as performed in this present study.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy

Amaechi

Wang

2022

JMSE

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There is an increase in the utilization of the floating offshore structure (FOS) called Catenary Anchor Leg Mooring (CALM) buoys and the attached marine hoses due to the increasing demand for oil and gas products. These hoses are flexible and easier to use but have a short service life of about 25 years. They are adaptable in ocean locations of shallow, intermediate and deep waters. In this research, a numerical model was developed using a coupling method modeled by utilizing ANSYS AQWA and Orcaflex (Orcina Ltd., Ulverston, UK) dynamic models of the CALM buoy hoses. Two cases were comparatively studied: Lazy-S and Chinese-lantern configurations, under ocean waves and current. Comparisons were also made between coupled and uncoupled models. This research presents the hydrodynamic characteristics with a sensitivity analysis on the influence of waves, current attack angle, soil gradient, soil stiffness and environmental conditions that influence the performance of marine hoses. The study comparatively looked at the configurations from dynamic amplification factors (DAF) on marine hoses. The results show that marine hoses can be easily configured to suit the designer’s need, seabed soil type, seabed topography and the profiles that are useful for manufacturers. The sensitivity analysis also shows the effect of hose parameters on its hydrodynamic behavior from the wave–current interaction (WCI).

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Section: Introductionmentioning

confidence: 99%

Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy

Amaechi

Wang

2022

JMSE

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Nonlinear Dynamic Analysis of Steel Lazy Wave Riser using Lumped Mass Line Model

Oh¹,

Jung²,

Park³

et al. 2019

J. Ocean Eng. Technol.

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In this study, the numerical code for the 3D nonlinear dynamic analysis of an SLWR (Steel Lazy Wave Riser) was developed using the lumped mass line model in a FORTRAN environment. Because the lumped mass line model is an explicit method, there is no matrix operation. Thus, the numerical algorithm is simple and fast. In the lumped mass line model, the equations of motion for the riser were derived by applying the various forces acting on each node of the line. The applied forces at the node of the riser consisted of the tension, shear force due to the bending moment, gravitational force, buoyancy force, riser/ground contact force, and hydrodynamic force based on the Morison equation. Time integration was carried out using a Runge-Kutta fourth-order method, which is known to be stable and accurate. To validate the accuracy of the developed numerical code, simulations using the commercial software OrcaFlex were carried out simultaneously and compared with the results of the developed numerical code. To understand the nonlinear dynamic characteristics of an SLWR, dynamic simulations of SLWRs excited at the hang-off point and of SLWRs in regular waves were carried out. From the results of these dynamic simulations, the displacements at the maximum bending moments at important points of the design, like the hang-off point, sagging point, hogging points, and touchdown point, were observed and analyzed.

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Sensitivity Study on SCR Design for Spread-Moored FPSO in West Africa

Abstract: It is generally acknowledged that the Steel Catenary Riser (SCR) is

Cited by 2 publications

References 10 publications

Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy

Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy

Nonlinear Dynamic Analysis of Steel Lazy Wave Riser using Lumped Mass Line Model

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