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All Journal IJOCE (International Journal of Offshore and Coastal Engineering)
Eko Budi Djatmiko
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Engineering

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The Study of Tandem Offloading Performance and Operability on The Cylindrical Hull FPSO Sevan Stabilized Platform with Variation in Mooring System Configuration Eko Budi Djatmiko; Jousie Rebecca; Murdjito Murdjito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1394.75 KB) | DOI: 10.12962/j2580-0914.v1i2.7054

Abstract

This study has been carried out to evaluate the dynamic behavior of the Cylindrical FPSO Sevan Stabilized Platform (SSP) and the LNG Carrier (LNGC) during the process of tandem offloading. The study includes hydrodynamics modellings, computations, and simulations of both cases SSP and LNGC operated individually and in combination for offloading operations. The SSP is moored with two variations of mooring, namely taut and catenary. Environmental loads are waves with the incorporated winds and currents propagating 90o, 210o, and 330o relative to the SSP headings. Excitation of random waves up to Hs = 4.50 m instigates the relatively low SSP motions in standalone condition. In offloading condition, when LNGC is connected, the SSP motion could magnify as much as 2.0 up to 5.0 times higher than that in standalone condition, but still considered in an acceptable level. The motion quality of LNGC in offloading operation is comparable with the SSP. For various random wave headings with Hs = 4.50 m during offloading operation may generate maximum tensions between 1,600 kN up to 2,600 kN in the casse of catenary mooring, and between 4,700 kN up to 7,000 kN in the case of taut mooring. Even then, this largest tension preserves a safety factor of 2.05 which is well above the limit of 1.67 as required by the governing standards. Finally, the study conclude an operability of as much as 90% could be achieved on SSP and LNGC offloading operation in the Masela Block of the Abadi Gas Field.
Line Clashing Probability Analysis of Catenary Anchored Leg Mooring with Quadraple Marine Hose Configuration Gumilang Alhafiz; Murdjito; Eko Budi Djatmiko; Fajar Rachmadiarto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9920

Abstract

Global efforts to reduce carbon emissions have encouraged the adoption of lighter and more flexible offshore structures in support of Sustainable Development Goal (SDG) 13 and the International Maritime Organization (IMO) climate initiatives. This study investigates the technical performance of a Catenary Anchored Leg Mooring (CALM) terminal system connected to a Floating Storage and Offloading (FSO) facility using four subsea hose configurations of the Chinese lantern and lazy S types. Due to their flexibility, subsea hoses are susceptible to clashing under extreme environmental conditions, potentially causing damage and reducing operational reliability. Dynamic simulations were conducted to evaluate tensile forces, minimum bending radius, bending moments, shear forces, torsion moments, and the probability of hose clashing. Prior to the analysis, buoy stability was assessed following modifications to the hose configuration. The results indicate that the additional hose arrangement increased the buoy draft by 14.9% to 2.73 m. Under Accidental Limit State (ALS) conditions caused by anchor chain failure, structural loads on the hoses increased significantly, while the minimum bending radius decreased by 6%. Furthermore, the probability of hose clashing was substantially higher in ALS conditions than in Ultimate Limit State (ULS) conditions, demonstrating that anchor chain failure significantly increases the risk of subsea hose interaction and potential damage.
Co-Authors Fajar Rachmadiarto Gumilang Alhafiz Jousie Rebecca Murdjito Murdjito Murdjito