Dynamic Analysis Of Submarine Hose Bending Radius And Tension Response In The FSO Federal II Offloading System

Prabaswara, Mahardika Agung (2026) Dynamic Analysis Of Submarine Hose Bending Radius And Tension Response In The FSO Federal II Offloading System. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proyek akhir ini menyajikan analisis dinamis terhadap sistem selang bawah laut pada konfigurasi pembongkaran FSO FEDERAL II, yang dioperasikan di Lapangan Widuri, lepas pantai Jawa Barat, Indonesia. Tujuan studi ini adalah untuk menentukan tegangan efektif maksimum dan radius lentur minimum (MBR) dari enam selang bawah laut (dua selang air laut, tiga selang minyak, satu selang gas) di bawah kondisi lingkungan ekstrem, serta untuk memverifikasi bahwa radius lentur tetap berada dalam batas yang diizinkan oleh pabrikan. Sifat hidrodinamik dan hidrostatik FSO FEDERAL II diperoleh menggunakan perangkat lunak MOSES, sedangkan OrcaFlex digunakan untuk simulasi dinamis domain waktu pada 20 skenario beban yang mencakup 8 arah lingkungan, dua kondisi kedalaman kapal (penuh muatan dan berbobot), serta skenario jangkar utuh/rusak. Data lingkungan bersumber dari Studi Metocean Lepas Pantai Sumatra GL Noble Denton berdasarkan periode pengulangan 100 tahun, dan spektrum gelombang JONSWAP dengan faktor peningkatan puncak γ = 1,5 diterapkan. Hasil simulasi menunjukkan bahwa tegangan efektif maksimum mencapai 13,85 Te di ujung PLEM selang gas (Selang 6) selama Kasus 12 (kondisi pemberat, lingkungan Barat Daya). Jari-jari tekukan minimum sebesar 1,71 m terjadi pada selang air laut (Selang 1) selama Kasus 1 (muatan penuh, Utara). Semua jari-jari tekukan yang dihitung melebihi jari-jari tekukan minimum yang diizinkan oleh pabrikan sebesar 1,60 m, yang menegaskan bahwa sistem selang kapal selam tetap aman secara struktural dalam kondisi simulasi kelangsungan hidup. Studi ini memberikan dasar teknis untuk verifikasi operasi dan konfigurasi yang aman dari sistem pembongkaran FSO FEDERAL II.
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This final project presents a dynamic analysis of the submarine hose system in the offloading arrangement of FSO FEDERAL II, operated in the Widuri Field, offshore West Java, Indonesia. The objective of the study is to determine the maximum effective tension and the minimum bending radius (MBR) of the six submarine hoses (two seawater, three oil, one gas) under extreme environmental conditions, and to verify that the bending radius remains within the manufacturer's allowable limit. The hydrodynamic and hydrostatic properties of FSO FEDERAL II were obtained using MOSES software, while OrcaFlex was employed for time-domain dynamic simulation under 20 load cases covering 8 environmental headings, two vessel draft conditions (fully loaded and ballasted), and intact/damaged mooring scenarios. Environmental data were sourced from the GL Noble Denton Offshore Sumatra Metocean Study based on a 100-year return period, and a JONSWAP wave spectrum with peak enhancement factor γ = 1.5 was applied. The simulation results show that the maximum effective tension reached 13.85 Te at the PLEM end of the gas hose (Hose 6) during Case 12 (ballasted condition, South West environment). The minimum bending radius of 1.71 m occurred on the seawater hose (Hose 1) during Case 1 (fully loaded, North). All calculated bending radii exceed the manufacturer's allowable minimum bending radius of 1.60 m, confirming that the submarine hose system remains structurally safe under the simulated survival conditions. The study provides the technical basis for the safe operation and configuration verification of the FSO FEDERAL II offloading system.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Selang Bawah Laut, Analisis Dinamis, Jari-jari Tekuk Minimum, Tegangan Efektif, FSO FEDERAL II, OrcaFlex, MOSES, Sistem Pembongkaran, Submarine Hose, Dynamic Analysis, Minimum Bending Radius, Effective Tension, FSO FEDERAL II, OrcaFlex, MOSES, Offloading System
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Mahardika Agung Prabaswara
Date Deposited:	01 Aug 2026 02:05
Last Modified:	01 Aug 2026 02:05
URI:	http://repository.its.ac.id/id/eprint/140949

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