Rahadiansyah, Muhammad Hafizh (2026) Analisis Sensitivitas Burst Pressure Pipa Bawah Laut terhadap Cacat Ganda Berorientasi Diagonal. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pipa bawah laut merupakan komponen vital dalam sistem transportasi minyak dan gas bumi yang harus mampu mempertahankan integritas struktural terhadap tekanan internal selama masa operasi. Salah satu mode kegagalan yang kritis adalah burst pressure, yaitu kondisi ketika tegangan akibat tekanan internal melampaui kekuatan ultimit material. Risiko ini meningkat apabila pipa mengalami cacat korosi ganda yang tersusun secara diagonal (Diagonally Positioned Dual Defects/DPDD), karena interaksi antar cacat dapat memperbesar konsentrasi tegangan dan mempercepat terjadinya kegagalan. Penelitian ini bertujuan untuk menganalisis pengaruh variasi jarak aksial dan circumferential antar cacat DPDD terhadap nilai burst pressure pipa baja API 5L Grade X65 pada studi kasus jalur pipa PT XYZ. Analisis dilakukan menggunakan pendekatan numerik Finite Element Analysis (FEA) dan dibandingkan dengan perhitungan analitis berdasarkan standar DNV-RP-F101. Parameter panjang dan kedalaman cacat dijaga konstan, sedangkan jarak antar cacat divariasikan untuk mengevaluasi tingkat interaksi tegangan. Hasil menunjukkan bahwa variasi jarak paling dekat menghasilkan burst pressure terendah sebesar 19,86 MPa (FEA) dan 19,69 MPa (DNV), sedangkan jarak lebih besar menghasilkan nilai tertinggi sebesar 27,25 MPa (FEA) dan 28,07 MPa (DNV). Perbedaan kedua metode berada pada rentang 0,86%–4,76%. Secara umum, semakin kecil jarak antar cacat, semakin menurun kapasitas tekanan maksimum pipa akibat peningkatan interaksi tegangan.
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Subsea pipelines play a vital role in oil and gas transportation systems and must maintain structural integrity under internal pressure throughout their service life. One critical failure mode is burst pressure, which occurs when the stress induced by internal pressure exceeds the ultimate strength of the material. This risk becomes more significant when the pipeline contains diagonally positioned dual corrosion defects (DPDD), as the interaction between defects can intensify stress concentration and accelerate structural failure. This study aims to analyze the effect of axial and circumferential spacing variations of DPDD on the burst pressure of an API 5L Grade X65 steel pipeline in a PT XYZ case study. The analysis was conducted using a numerical Finite Element Analysis (FEA) approach and compared with analytical calculations based on the DNV-RP-F101 standard. The defect length and depth were kept constant, while the spacing between defects was systematically varied to evaluate stress interaction effects. The results indicate that the closest defect spacing produced the lowest burst pressure, 19.86 MPa (FEA) and 19.69 MPa (DNV), whereas larger spacing resulted in the highest values of 27.25 MPa (FEA) and 28.07 MPa (DNV). The relative difference between the two methods ranged from 0.86% to 4.76%. Overall, reduced defect spacing significantly decreases the maximum pressure capacity due to increased stress interaction.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Pipa bawah laut, burst pressure, Diagonally Positioned Dual Defects, Finite Element Analysis, Subsea pipeline, burst pressure, Diagonally Positioned Dual Defects, Finite Element Analysis. |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Muhammad Hafizh Rahadiansyah |
| Date Deposited: | 05 May 2026 06:09 |
| Last Modified: | 05 May 2026 06:09 |
| URI: | http://repository.its.ac.id/id/eprint/132957 |
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