An Analysis on the Spread Mooring of the Belida FSO Induced by Squall Loads

Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan

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Title An Analysis on the Spread Mooring of the Belida FSO Induced by Squall Loads
 
Creator Murdjito, M
Pravitasari, Inneke Yulistanty
Djatmiko, Eko Budi
 
Subject Ocean Engineering
Squall; FSO; Spread Mooring; Mooring Tension; Offset
Marine Hydrodynamics
 
Description Squall is the occurrence of a sudden sharp increase in wind speed, thus amplifies sea environmental loads. In the South of Natuna Sea, squall can reach an intensity of up to 50 m/s or close to 100 knots. In this water, the Belida FSO operates at a water depth of 77.0 m, tethered to the seabed by a spread mooring system. Squall’s impacts on the FSO mooring system has been examined by implementing time-domain simulations accommodated in a numerical model based on the 3-D wave diffraction theory. The simulations were performed by varying the squall duration of escalation, i.e. 2.5, 5.0, and 10.0 minutes, for the load cases of 1-year extreme operational and 100-year extreme survival conditions propagating at 0°, 45°, 90°, 135°, 180°. The three squall durations of escalation substantially increase the significant wave height Hs by averagely 60%, 50% and 34%, respectively. The largest of the maximum mooring tension due to the sea load directions is found to be brought about the 45° load when magnified by the squall with a 2.5-minute duration of escalation. In this respect, the largest intensities of the operational and survival tension loads may reach some 2,027 kN and 3,318 kN, respectively, which are eventually far below the MBL of 7,685 kN. The largest x-axis offsets in operational and survival conditions are 3.94 m and 10.21 m, respectively. Whereas the largest y-axis offsets for operational and survival loads are found to be 13.31 m and 15.48 m. These y-axis offset intensities are larger than the limiting criteria, i.e. 15% of the water depth or 11.55 m.
 
Publisher Department of Naval Architecture - Diponegoro University
 
Contributor Medco E&P Natuna Ltd
PT Zee Indonesia
 
Date 2020-02-29
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

numerical modeling
 
Format application/pdf
 
Identifier https://ejournal.undip.ac.id/index.php/kapal/article/view/27554
10.14710/kapal.v17i1.27554
 
Source Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan; Vol 17, No 1 (2020): February; 15-27
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan; Vol 17, No 1 (2020): February; 15-27
2301-9069
1829-8370
 
Language eng
 
Relation https://ejournal.undip.ac.id/index.php/kapal/article/view/27554/16709
 
Coverage Natuna Sea Indonesia
Current
wind and wave intensities
 
Rights Copyright (c) 2020 Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
https://creativecommons.org/licenses/by-sa/4.0/
 

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