Analisis Local Stress pada Pipeline End Manifold (PLEM) Akibat Pipeline Walking pada Subsea Pipeline

Illahi, Rizki Cahya (2026) Analisis Local Stress pada Pipeline End Manifold (PLEM) Akibat Pipeline Walking pada Subsea Pipeline. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pipeline End Manifold (PLEM) merupakan salah satu komponen krusial dalam sistem subsea pada industri minyak dan gas lepas pantai yang berfungsi sebagai titik distribusi aliran fluida dari pipa bawah laut. Fenomena pipeline walking, yaitu pergerakan aksial progresif subsea pipeline akibat siklus tekanan internal dan perubahan temperatur, berpotensi menimbulkan tegangan lokal pada struktur PLEM sehingga dapat memengaruhi integritas struktur. Penelitian ini bertujuan untuk menganalisis besarnya pergerakan aksial subsea pipeline akibat pipeline walking, mengevaluasi tegangan lokal yang ditransmisikan ke struktur PLEM, serta mengidentifikasi deformasi yang terjadi. Analisis dilakukan melalui pemodelan numerik menggunakan AutoPIPE untuk menghitung respons pipa terhadap tekanan dan ekspansi termal, kemudian hasil perpindahan aksial digunakan sebagai beban pada pemodelan struktur PLEM menggunakan ANSYS dengan metode elemen hingga. Validasi model dilakukan melalui perbandingan massa struktur hasil pemodelan dengan data aktual. Hasil penelitian menunjukkan bahwa fenomena pipeline walking menghasilkan pergerakan aksial maksimum sebesar 78,5994 mm. Tegangan lokal maksimum pada struktur PLEM terjadi pada bagian piping berdiameter 10 inci dengan tegangan Von Mises sebesar 61,222 MPa, yang masih berada di bawah batas kekuatan material sehingga struktur dinyatakan aman. Selain itu, deformasi maksimum yang terjadi sebesar 0,1305 mm dan terlokalisasi pada bagian piping 10 inci, menunjukkan bahwa struktur memiliki kekakuan yang baik serta tidak mengalami perubahan bentuk yang signifikan. Hasil penelitian ini diharapkan dapat menjadi dasar dalam pengembangan desain dan strategi mitigasi risiko untuk meningkatkan keandalan sistem subsea pipeline terhadap fenomena pipeline walking.
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The Pipeline End Manifold (PLEM) is a critical component of offshore oil and gas subsea production systems, serving as the distribution point for fluid transported through subsea pipelines. One of the major challenges affecting the structural integrity of PLEM is pipeline walking, a progressive axial movement of subsea pipelines induced by cyclic internal pressure and temperature variations. This phenomenon may generate additional localized stresses on the PLEM, yet its structural impact has not been extensively investigated. Therefore, this study aims to analyze the axial displacement of a subsea pipeline caused by pipeline walking, evaluate the resulting local stresses transmitted to the PLEM, and assess the structural deformation. Numerical simulations were performed using AutoPIPE to evaluate pipeline responses under internal pressure and thermal expansion. The resulting axial displacement was then applied as a boundary load in a finite element model of the PLEM developed in ANSYS. Model validation was conducted by comparing the modeled structural mass with the actual design data. The results indicate that the maximum axial displacement due to pipeline walking reached 78.5994 mm. The highest local stress occurred in the 10-inch piping section, with a maximum Von Mises stress of 61.222 MPa, which remains well below the material yield strength, indicating that the structure is operating within a safe condition. Furthermore, the maximum deformation was 0.1305 mm, also located in the 10-inch piping section, demonstrating that the PLEM possesses sufficient structural stiffness to withstand the applied loading without significant deformation. These findings provide valuable insights for improving the structural design and risk mitigation strategies of subsea pipeline systems subjected to pipeline walking.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pipeline Walking, Subsea Pipeline, PLEM, Tegangan Lokal, Sistem Subsea
Subjects:	Q Science > QC Physics > QC151 Fluid dynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Rizki Cahya Illahi
Date Deposited:	31 Jul 2026 08:22
Last Modified:	31 Jul 2026 08:22
URI:	http://repository.its.ac.id/id/eprint/141038

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