Analisis Risiko Terhadap Respon Struktural Platform Akibat Accidental Boat Impact

Windhiafirzana, Azra Callysta (2026) Analisis Risiko Terhadap Respon Struktural Platform Akibat Accidental Boat Impact. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Delta Mahakam merupakan salah satu wilayah utama eksplorasi minyak dan gas di Indonesia yang menggunakan struktur Four Legs Bi-Slot Wellhead Platform. Dalam operasionalnya, platform ini memiliki potensi mengalami accidental boat impact akibat tingginya intensitas pergerakan crew boat pada jalur pelayaran yang relatif sempit. Penelitian ini bertujuan untuk menganalisis respon struktural boat landing terhadap variasi skenario tumbukan dan sudut datang kapal, serta melakukan analisis risiko berdasarkan hasil simulasi tumbukan kapal terhadap struktur platform. Simulasi numerik dilakukan menggunakan perangkat lunak SACS dengan variasi energi tumbukan sebesar 10,3 kN·m pada kecepatan 1 m/s, 40,7 kN·m pada kecepatan 2 m/s, dan 91,5 kN·m pada kecepatan 3 m/s. Hasil analisis menunjukkan bahwa tegangan maksimum terjadi pada kondisi ekstrim dengan nilai tegangan maksimum sebesar 6.741 N/mm2. Sementara itu, defleksi maksimum terjadi pada kondisi normal dengan perpindahan joint sebesar 100,642 cm ke arah sumbu X. Berdasarkan hasil analisis risiko, pada kondisi normal tingkat risiko masih berada dalam kategori low sampai high risk, sedangkan pada kondisi ekstrim seluruh skenario tumbukan berada pada kategori high risk. Selanjutnya, dilakukan penerapan sistem fender sebagai upaya mitigasi risiko. Hasil analisis menunjukkan bahwa penggunaan fender mampu menurunkan tegangan maksimum hingga 274,96 N/mm2 serta mengurangi defleksi maksimum menjadi 52,036 cm ke arah sumbu X. Hasil matriks risiko setelah penerapan mitigasi menunjukan kondisi normal berada pada kategori low sampai medium risk dan pada kondisi ekstrim seluruh skenario menurun menjadi medium risk. Hal ini menunjukkan bahwa penerapan sistem fender efektif dalam menurunkan tingkat risiko serta meningkatkan keselamatan dan keandalan struktur boat landing pada platform lepas pantai.
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The Mahakam Delta is one of Indonesia’s key offshore oil and gas production areas. Four Legs Bi-Slot Wellhead Platforms are widely installed in this region and are exposed to accidental boat impact due to the high intensity of crew boat operations within narrow navigation channels. This study analyzes the structural response of the boat landing under various collision scenarios and evaluates the associated risks through numerical simulations. The analysis was performed using SACS with impact energies of 10.3 kN·m at a vessel speed of 1 m/s, 40.7 kN·m at 2 m/s, and 91.5 kN·m at 3 m/s. The results show that the maximum equivalent stress occurs under extreme conditions, reaching 6,741 N/mm2, while the maximum deflection occurs under normal operating conditions with a joint displacement of 100.642 cm in the X-axis direction. Risk analysis indicates that the risk level remains acceptable under normal conditions, whereas all extreme-condition scenarios fall into the high-risk category. The implementation of a fender system significantly reduces the maximum stress to 274,96 N/mm2 and decreases the maximum deflection to 52,036 cm in the X-axis direction. The results of the risk matrix after the implementation of mitigation measures indicate that under normal conditions, the risk level falls within the low to medium risk categories, while under extreme conditions, all scenarios are reduced to the medium risk category. This demonstrates that the application of the fender system is effective in reducing risk levels and enhancing the safety and structural reliability of the boat landing on the offshore platform.

Item Type: Thesis (Other)
Uncontrolled Keywords: tabrakan kapal, analisis struktur, boat landing, analisis risiko, boat impact, structure analysis, boat landing, risk analysis
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: ms azra windhiafirzana
Date Deposited: 20 Jan 2026 07:25
Last Modified: 20 Jan 2026 07:25
URI: http://repository.its.ac.id/id/eprint/129832

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