Desain Pipa Bawah Laut Untuk Transportasi CO2 Dan Evaluasi Integritas Struktur Pipa Dengan Metode Finite Element Analysis (FEA)

Bahari, Bachtiar Shifa (0029) Desain Pipa Bawah Laut Untuk Transportasi CO2 Dan Evaluasi Integritas Struktur Pipa Dengan Metode Finite Element Analysis (FEA). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan emisi karbon dioksida (CO₂) mendorong penerapan teknologi Carbon Capture and Storage (CCS), yang memerlukan sistem transportasi CO₂ yang aman dan andal. Pipa bawah laut merupakan moda transportasi yang paling efektif untuk distribusi CO₂ dalam jumlah besar, namun keberadaan impuritas seperti air (H₂O) dapat menyebabkan korosi internal yang menurunkan integritas pipa selama masa operasi. Penelitian ini bertujuan menentukan rute pipa bawah laut yang optimal menuju Sunda Asri Basin, merancang pipa sesuai standar dan regulasi, serta mengevaluasi integritas struktur terhadap risiko kegagalan yang diperburuk oleh korosi. Penentuan rute dilakukan berdasarkan analisis batimetri sehingga diperoleh jalur dengan profil elevasi yang relatif stabil dan panjang lintasan yang optimum. Perancangan pipa mengacu pada standar DNV dan API 5L, menghasilkan spesifikasi pipa berdiameter luar 12,75 inci dengan ketebalan dinding 12,7 mm yang memenuhi ketebalan minimum sebesar 6,9 mm berdasarkan kriteria local buckling due to combined loading. Analisis stabilitas menunjukkan kebutuhan concrete weight coating sebesar 35 mm pada perairan dangkal dan 25 mm pada perairan dalam, serta panjang free span yang memenuhi batas aman Fatigue Limit State, yaitu 20 m dan 22 m. Evaluasi integritas dilakukan menggunakan metode Finite Element Analysis (FEA) dengan mempertimbangkan penurunan ketebalan akibat korosi selama umur operasi. Hasil simulasi menunjukkan bahwa pipa diprediksi mengalami kondisi kritis pada tahun ke-30 akibat tegangan aksial, kemudian potensi korosi semakin memperburuk struktur. Sebagai upaya mitigasi, dilakukan evaluasi metode perbaikan menggunakan composite patch dan steel sleeve. Berdasarkan hasil simulasi, distribusi pembebanan yang dihasilkan oleh patch dan sleeve menunjukkan mekanisme perbaikan yang berbeda. Composite efektif mendistribusikan kembali tegangan pada area retak yang bersifat lokal dengan penurunan nilai J-Integral hingga 84%, sedangkan sleeve memberikan distribusi pembebanan yang lebih merata pada area yang lebih luas sehingga mampu menurunkan nilai J-Integral hingga 95%. Oleh karena itu, composite patch lebih sesuai untuk menangani localized fracture, sedangkan steel sleeve lebih tepat diterapkan pada kerusakan dengan area yang lebih luas.
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Rising carbon dioxide (CO₂) emissions are driving the adoption of Carbon Capture and Storage (CCS) technology, which requires a CO₂ transportation system that is safe and reliable. Subsea pipelines are the most effective mode of transportation for distributing large volumes of CO₂, but the presence of impurities such as water (H₂O) can cause internal corrosion that compromises pipeline integrity during operation. This study aims to determine the optimal subsea pipeline route to the Sunda Asri Basin, design the pipeline in accordance with standards and regulations, and evaluate the structural integrity against failure risks exacerbated by corrosion. Route determination is based on bathymetric analysis to identify a path with a relatively stable elevation profile and an optimal route length. The pipeline design adheres to DNV and API 5L standards, resulting in specifications for a pipeline with an outer diameter of 12.75 inches and a wall thickness of 12.7 mm, which meets the minimum wall thickness requirement of 6.9 mm based on the criteria for local buckling due to combined loading. Stability analysis indicated a requirement for a 35 mm concrete weight coating in shallow waters and a 25 mm coating in deep waters, as well as free span lengths that meet the Fatigue Limit State safety limits, namely 20 m and 22 m. The integrity assessment was conducted using the Finite Element Analysis (FEA) method, taking into account thickness reduction due to corrosion over the operational lifespan. Simulation results indicate that the pipeline is predicted to reach a critical condition in the 30th year due to axial stress, with potential corrosion further deteriorating the structure. As a mitigation measure, an evaluation of repair methods using composite patches and steel sleeves was conducted. Based on the simulation results, the load distribution produced by patch repairs and composite sleeves demonstrates different repair mechanisms. The composite patch effectively redistributes stress in localized crack areas, reducing the J-Integral value by up to 84%, while the steel sleeve provides a more even load distribution over a wider area, thereby reducing the J-Integral value by up to 95%. Therefore, composite patches are more suitable for addressing localized fractures, whereas steel sleeves are more appropriate for damage covering a wider area.

Item Type:	Thesis (Other)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Bachtiar Shifa Bahari
Date Deposited:	04 Aug 2026 02:11
Last Modified:	04 Aug 2026 02:11
URI:	http://repository.its.ac.id/id/eprint/142597

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