Analisis Stationkeeping Saat Proses Instalasi Mooring Line Pada FPSO 100.000 DWT Dengan Variasi Beban Lingkungan

Al Anshari, Muhammad Haikal (2025) Analisis Stationkeeping Saat Proses Instalasi Mooring Line Pada FPSO 100.000 DWT Dengan Variasi Beban Lingkungan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian tugas akhir ini menganalisis kemampuan stationkeeping FPSO 100.000 DWT selama proses instalasi mooring line di perairan Natuna dengan variasi konfigurasi tugboat. Metode time domain digunakan dengan software MOSES untuk memodelkan gerak FPSO, mooring system spread mooring, serta gaya tarik tugboat. Analisis dilakukan pada lima arah beban lingkungan (0°, 45°, 90°, 135°, dan 180°) dengan menggunakan data lingkungan pada 1 bulan. Evaluasi meliputi excursion FPSO (pada mode gerak surge, sway dan yaw), tegangan maksimum mooring line, serta kebutuhan bollard pull pada tiga konfigurasi tugboat yang berbeda. Hasil menunjukkan bahwa variasi konfigurasi tugboat berpengaruh signifikan terhadap excursion FPSO dan distribusi tegangan pada mooring line selama proses instalasi. Nilai excursion pada mode gerak surge terbesar terdapat pada konfigurasi pertama yaitu 4,940 m/m, mode gerak sway terbesar terdapat pada konfigurasi pertama dengan nilai 5,570 m/m, mode gerak yaw terbesar terdapat pada konfigurasi pertama dengan nilai 4,490 deg/m. Hasil analisis mooring line tension terbesar pada konfigurasi pertama senilai 134,230 ton dengan safety factor 4,782, tension terbesar pada konfigurasi kedua yaitu 122,09 ton dengan safety factor 5,258 dan tension terbesar pada konfigurasi ketiga yaitu 119,390 ton dengan safety factor 5,377. Dari ketiga konfigurasi, dapat disimpulkan tidak terdapat tension yang melebihi safety factor dari API RP-2SK yaitu ≥1,67. Dengan perhitungan tug efficiency dapat diketahui kebutuhan bollard pull pada gaya tarik pertama yaitu sebesar 84,910 ton, pada gaya tarik kedua sebesar 87,990 ton dan pada gaya tarik ketiga sebesar 90,430 ton.
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This final project research analyzes the stationkeeping capability of a 100,000 DWT FPSO during the mooring line installation process in Natuna waters with variations in tugboat configurations. A time domain method was applied using MOSES software to model the FPSO motion, spread mooring system, and tugboat pulling forces. The analysis was carried out for five environmental load directions (0°, 45°, 90°, 135°, and 180°) using one-month environmental data. The evaluation covered FPSO excursions (in surge, sway, and yaw modes), maximum mooring line tensions, and required bollard pull for three different tugboat configurations. The results show that tugboat configuration variations significantly affect FPSO excursions and mooring line tension distribution during the installation process. The highest surge mode excursion was found in the first configuration at 4,940 m/m, the highest sway at 5,570 m/m also in the first configuration, and the largest yaw at 4,490 deg/m in the same configuration. The maximum mooring line tension occurred in the first configuration at 134,230 tons with a safety factor of 4,782, the second configuration at 122,09 tons with a safety factor of 5,258, and the third configuration at 119,390 tons with a safety factor of 5,377. From these results, it can be concluded that none of the tensions exceeded the safety factor required by API RP-2SK (≥1.67). Based on tug efficiency calculations, the required bollard pull was found to be 84,910 tons for the first configuration, 87,990 tons for the second, and 90,430 tons for the third configuration.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bollard pull, Mooring line, Stationkeeping, Bollard pull, Mooring line, Stationkeeping
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Muhammad Haikal Al Anshari
Date Deposited:	27 Jul 2025 08:30
Last Modified:	27 Jul 2025 08:30
URI:	http://repository.its.ac.id/id/eprint/122075

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