Analisis Bursting Pressure pada Pipa yang Mengalami Korosi Internal Sepasang secara Radial

Pramudianto, Andrew Fristianto (2026) Analisis Bursting Pressure pada Pipa yang Mengalami Korosi Internal Sepasang secara Radial. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipa penyalur hidrokarbon rentan mengalami korosi internal akibat fluida produksi yang dapat mengurangi ketebalan dinding pipa dan menurunkan kemampuan menahan tekanan internal. Risiko kegagalan meningkat apabila korosi terjadi dalam bentuk cacat berpasangan yang tersusun secara radial karena interaksi tegangan antar cacat. Penelitian ini menganalisis bursting pressure pada pipa dengan cacat korosi internal sepasang berbentuk rectangular dan ellips pada variasi kedalaman 25%, 50%, dan 75% tebal dinding menggunakan material API 5L X60. Analisis dilakukan dengan metode empiris DNV-RP-F101 dan metode elemen hingga (Finite Element Method/FEM), dengan kriteria kegagalan saat tegangan ekuivalen Von Mises mencapai Ultimate Tensile Strength (UTS) material dengan tujuan dibandingkan dengan prediksi bursting pressure berdasarkan metode empiris dari DNV-RP-F101 untuk mengevaluasi pengaruh bentuk cacat terhadap kekuatan sisa pipa serta tingkat perbedaan antara metode numerik dan metode analitis. Hasil menunjukkan bahwa nilai burst pressure berdasarkan DNV-RP-F101 berada pada rentang 9,26 MPa hingga 19,54 MPa. Bentuk geometri cacat berpengaruh signifikan terhadap burst pressure, di mana cacat rectangular menghasilkan nilai yang lebih rendah dibandingkan cacat ellips akibat konsentrasi tegangan yang lebih tinggi. Perbandingan DNV-RP-F101 dan FEM menunjukkan perbedaan hasil sebesar 3% hingga 38%, yang dipengaruhi oleh kemampuan masing-masing metode dalam merepresentasikan distribusi tegangan di sekitar cacat.
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Internal corrosion in hydrocarbon transmission pipelines, induced by produced fluids, is a critical degradation mechanism that reduces pipe wall thickness and consequently lowers its resistance to internal pressure. The risk of failure increases when corrosion occurs as radially aligned paired defects, owing to stress interaction between adjacent flaws. This study analyzes the burst pressure of API 5L X60 pipelines containing a pair of rectangular and elliptical internal corrosion defects at depths of 25%, 50%, and 75% of the wall thickness. The analysis was conducted using the empirical DNV-RP-F101 method and the finite element method (FEM), with failure defined as the condition in which the von Mises equivalent stress reaches the material's ultimate tensile strength (UTS), in order to compare the resulting burst pressure predictions with those obtained from the DNV-RP-F101 empirical method and thereby evaluate the influence of defect geometry on the pipe's residual strength as well as the discrepancy between the numerical and analytical approaches. The results show that burst pressure values predicted by DNV-RP-F101 range from 9.26 MPa to 19.54 MPa. Defect geometry was found to significantly affect burst pressure, with rectangular defects yielding lower values than elliptical defects due to higher stress concentration. The comparison between DNV-RP-F101 and FEM revealed discrepancies ranging from 3% to 38%, attributable to the differing capability of each method to represent the stress distribution around the defect.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	korosi internal, bursting pressure, cacat ganda, circumferential spacing, FEM, DNV-RP-F101.
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:	Andrew Fristianto Pramudianto
Date Deposited:	21 Jul 2026 01:30
Last Modified:	21 Jul 2026 01:30
URI:	http://repository.its.ac.id/id/eprint/135958

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