Analisis Deformasi Pada Exposed Subsea Pipeline Akibat Dropped Anchor

Allisabetha, Francciska (2026) Analisis Deformasi Pada Exposed Subsea Pipeline Akibat Dropped Anchor. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kerusakan subsea pipeline akibat aktivitas perkapalan, khususnya kejadian dropped anchor, merupakan salah satu bentuk third-party damage yang berpotensi mengganggu integritas dan keandalan sistem perpipaan bawah laut. Penelitian ini bertujuan untuk menganalisis deformasi yang terjadi pada subsea pipeline akibat tumbukan jangkar, mengevaluasi pengaruh variasi massa jangkar terhadap deformasi yang dihasilkan, serta menentukan tingkat kerusakan pipeline berdasarkan standar DNV-GL-RP-F107. Analisis dilakukan menggunakan metode Finite Element Method (FEM) pada ANSYS Transient Structural. Variasi massa jangkar yang digunakan adalah 1 ton, 3 ton, dan 5 ton. Hasil simulasi menunjukkan bahwa deformasi maksimum pipeline meningkat seiring bertambahnya massa jangkar, yaitu sebesar 13,02 mm, 43,21 mm, dan 61,55 mm. Validasi dengan perhitungan analitik menghasilkan nilai MAPE sebesar 4,79%, yang menunjukkan akurasi model sangat baik. Berdasarkan dent ratio, variasi massa 1 ton menghasilkan nilai 3,2% dan termasuk kategori D1 (minor damage) dengan kategori kebocoran R0. Variasi massa 3 ton dan 5 ton menghasilkan dent ratio masing-masing sebesar 10,6% dan 15,1%, yang termasuk kategori D3 (major damage), dengan kategori kebocoran berturut-turut R0 dan R1. Hasil penelitian menunjukkan bahwa peningkatan massa jangkar memberikan pengaruh yang signifikan terhadap deformasi dan tingkat kerusakan subsea pipeline, sehingga dapat menjadi dasar dalam evaluasi integritas struktur serta penyusunan strategi mitigasi risiko akibat kejadian dropped anchor.
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Damage to subsea pipelines caused by maritime activities, particularly dropped anchor incidents, is one of the most common forms of third-party damage that can compromise the integrity and reliability of offshore pipeline systems. This study aims to analyze the deformation of an exposed subsea pipeline subjected to anchor impact, evaluate the effect of anchor mass variations on pipeline deformation, and determine the level of pipeline damage based on the DNV-GL-RP-F107 standard. The analysis was conducted using the Finite Element Method (FEM) in ANSYS Transient Structural. Three anchor mass variations were considered 1 ton, 3 tons, and 5 tons. The simulation results indicate that the maximum pipeline deformation increases with increasing anchor mass, reaching 13.02 mm, 43.21 mm, and 61.55 mm, respectively. Validation against analytical calculations yielded a Mean Absolute Percentage Error (MAPE) of 4.79%, indicating excellent agreement between the numerical model and the analytical approach. Based on the dent ratio assessment, the 1-ton anchor resulted in a 3.2% dent ratio, classified as D1 (minor damage) with R0 (no leakage). Meanwhile, the 3 ton and 5 ton anchors produced dent ratios of 10.6% and 15.1%, respectively, both classified as D3 (major damage), with leakage categories of R0 and R1, respectively. The results demonstrate that increasing anchor mass has a significant influence on both pipeline deformation and damage severity. These findings can serve as a basis for evaluating subsea pipeline structural integrity and developing risk mitigation strategies against dropped anchor incidents.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	subsea pipeline, dropped anchor, deformation, dent ratio, Finite Element Method, DNV-GL-RP-F107, deformasi
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Francciska Allisabetha
Date Deposited:	20 Jul 2026 00:47
Last Modified:	20 Jul 2026 00:47
URI:	http://repository.its.ac.id/id/eprint/135653

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