Putratama, Acsca Mabiel (2025) Penilaian Risiko Dan Analisis Accidental Limit State Pipa Bawah Laut Akibat Aktivitas Kapal: Studi Kasus Pipa Transmisi Gas 32" Di Laut Jawa. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pipa bawah laut merupakan komponen penting dalam sistem transmisi gas alam, terutama untuk jalur distribusi yang melintasi wilayah laut. Namun, keberadaan pipa ini sangat rentan terhadap kerusakan yang disebabkan oleh aktivitas kapal, seperti kejatuhan jangkar (dropped anchor), jangkar terseret (dragged anchor), serta kecelakaan kapal tenggelam (ship sinking). Oleh karena itu, penelitian ini bertujuan untuk melakukan penilaian risiko terhadap pipa transmisi gas bawah laut berdiameter 32 inci di Laut Jawa, dengan mengacu pada standar DNV- RP-F107 sebagai panduan utama. Penilaian dilakukan melalui identifikasi bahaya, analisis frekuensi dan konsekuensi berdasarkan data lalu lintas kapal, properti pipa, dan kondisi lingkungan yang kemudian diklasifikasikan dalam matriks risiko. Selain itu, dilakukan juga analisis Accidental Limit State (ALS) berdasarkan standar DNV-ST-F101, untuk mengevaluasi respons struktur pipa terhadap beban akibat interaksi dengan jangkar melalui parameter Maximum Allowable Tensile Strength (MATS) dan Minimum Bending Radius (MBR). Penilaian risiko dilakukan dengan mempertimbangkan tujuh tipe kapal pada skenario kecepatan 3 knot, 7 knot, dan 11 knot. Berdasarkan hasil penilaian, sebagian besar risiko akibat aktivitas kapal berada dalam kategori ALARP (As Low As Reasonably Practicable) sehingga diperlukan adanya tindakan mitigasi. Pada hasil analisis Accidental Limit State (ALS), dengan melakukan simulasi menggunakan perangkat lunak OrcaFlex untuk skenario pull-over dan hooking, didapatkan bahwa skenario pull over dengan berat jangkar 20.000 kg, dikatakan unacceptable dikarenakan menghasilkan tegangan sebesar 56000 KN yang mana nilai tersebut melebihi nilai MATS yaitu 13000 KN. Sedangkan pada skenario hooking, dengan menggunakan berat jangkar yang sama, dikatakan acceptable dikarenakan tidak menghasil nilai tegangan dan bending yang melebihi MATS dan MBR
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Subsea pipelines are an important component of natural gas transmission systems, especially for distribution lines that cross marine areas. However, these pipelines are vulnerable to damage caused by ship activities, such as dropped anchors, dragged anchors, and ship sinking accidents. Therefore, this study aims to conduct a risk assessment of a 32-inch diameter subsea gas transmission pipeline in the Java Sea, with reference to the DNV- RP-F107 standard as the main guide. The assessment is carried out through hazard identification, frequency and consequence analysis based on ship traffic data, pipeline properties, and environmental conditions which are then classified in a risk matrix. In addition, an Accidental Limit State (ALS) analysis based on the DNV-ST-F101 standard was also conducted, to evaluate the response of the pipe structure to loads due to interaction with the anchor through the Maximum Allowable Tensile Strength (MATS) and Minimum Bending Radius (MBR) parameters. The risk assessment was conducted by considering seven ship types at 3 knots, 7 knots, and 11 knots speed scenarios. Based on the assessment results, most of the risks due to ship activities are in the ALARP (As Low As Reasonably Practicable) category so that mitigation measures are needed. In the Accidental Limit State (ALS) analysis results, by simulating using OrcaFlex software for pull-over and hooking scenarios, it was found that the pull over scenario with an anchor weight of 20,000 kg, was said to be unacceptable because it produced a stress of 56000 KN which exceeded the MATS value of 13000 KN. While in the hooking scenario, using the same anchor weight, it is said to be acceptable because it does not produce stress and bending values that exceed MATS and MBR.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Pipa Bawah Laut, Aktivias Kapal, Penilaian Risiko, Accidental Limit State, Subsea Pipeline, Ship Activities, Risk Assessment |
| Subjects: | T Technology > T Technology (General) > T174.5 Technology--Risk assessment. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines. T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Acsca Mabiel Putratama |
| Date Deposited: | 29 Jul 2025 01:10 |
| Last Modified: | 29 Jul 2025 01:10 |
| URI: | http://repository.its.ac.id/id/eprint/120965 |
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