Analisis Local Buckling dan Risiko Pipa Bawah Laut Akibat Benturan Jangkar : Studi Kasus Pipa West Natuna Transportaion System

Rafsanjani, Rafi Fikri (2025) Analisis Local Buckling dan Risiko Pipa Bawah Laut Akibat Benturan Jangkar : Studi Kasus Pipa West Natuna Transportaion System. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5020211081-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (7MB) | Request a copy

Abstract

Penelitian ini menganalisis risiko kerusakan pipa bawah laut akibat jatuh dan terseretnya jangkar kapal. Pada skenario jatuhnya jangkar, kapal dengan bobot 1.000 DWT hingga 50.000 DWT dengan jangkar di bawah 12.900 kg berada dalam kategori risiko ALARP (As Low As Reasonably Practicable). Namun, kapal di atas 50.000 DWT dengan jangkar lebih berat dari 12.900 kg memiliki tingkat risiko yang tidak dapat diterima. Sedangkan pada skenario terseretnya jangkar, kapal dengan bobot 1.000 DWT hingga 100.000 DWT menunjukkan risiko yang tidak dapat diterima. Analisis frekuensi menunjukkan bahwa peluang jatuhnya jangkar menyebabkan risiko yang tidak dapat diterima bagi kapal 1.000 DWT hingga 100.000 DWT. Simulasi menggunakan ANSYS LS-Dyna menunjukkan deformasi maksimum sebesar 214,36 mm pada area benturan dengan tegangan Von Mises tertinggi mencapai 326,96 MPa, masih di bawah batas leleh material pipa sebesar 450 MPa. Sebagai mitigasi, metode Pipeline Buried dipilih dengan mengubur pipa pada kedalaman 1 meter. Hasil analisis menunjukkan bahwa tanah mampu menyerap energi sebesar 1.046,2 kJ, sehingga secara signifikan meningkatkan perlindungan pipa terhadap dampak jangkar kapal. Dengan pendekatan ini, risiko kerusakan dapat diminimalkan, menjadikannya solusi yang efektif dalam meningkatkan keselamatan operasional pipa bawah laut.
========================================================================================================================================
This study analyzes the risk of submarine pipeline damage due to anchor drop and drag using Consequence Analysis and Frequency Analysis methods. The results indicate that the higher the energy received by the pipeline, the greater the damage severity. In the anchor drop scenario, ships weighing between 1,000 DWT and 50,000 DWT with anchors below 12,900 kg fall into the ALARP (As Low As Reasonably Practicable) risk category. However, ships exceeding 50,000 DWT with anchors heavier than 12,900 kg present an unacceptable risk level. In the anchor drag scenario, ships ranging from 1,000 DWT to 100,000 DWT also exhibit an unacceptable risk level. Frequency analysis shows that the probability of anchor drop at 1%, 5%, and 10%, and the probability of pipeline dragging at 0.5%, 2.5%, and 5%, result in an unacceptable risk level for ships weighing 1,000 DWT to 100,000 DWT. Simulations using ANSYS LS-Dyna reveal a maximum deformation of 214,36 mm at the impact area, with the highest Von Mises stress reaching 326,96 MPa, still below the pipeline material yield strength of 450 MPa. As a mitigation measure, the Pipeline Buried method is implemented by burying the pipeline at a depth of 1 meter. The analysis results indicate that the soil can absorb energy up to 1,046.2 kJ, significantly enhancing pipeline protection against anchor impact. This approach effectively minimizes damage risks, making it a reliable solution for improving the operational safety of submarine pipelines.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pipa bawah laut, Jatuh jangkar, Terseret jangkar, Risiko Pipa, Mitigasi,Ansys LS-DYNA. Submarine pipeline, anchor drop, anchor drag, pipeline risk,mitigation, ANSYS LS-Dyn
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Rafi Fikri Rafsanjani
Date Deposited:	03 Jul 2025 12:06
Last Modified:	03 Jul 2025 12:06
URI:	http://repository.its.ac.id/id/eprint/119362

Actions (login required)

View Item