Analisis Tegangan Padeye Pada Proses Lowering Struktur Subsea PLEM Dengan Variasi Rigging Arrangement

Al Fadh, Muhammad Fathoni (2026) Analisis Tegangan Padeye Pada Proses Lowering Struktur Subsea PLEM Dengan Variasi Rigging Arrangement. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Instalasi Pipeline End Manifold (PLEM) merupakan tahapan kritis dalam pengembangan sistem produksi migas lepas pantai, khususnya pada proses lowering melalui splash zone yang dipengaruhi beban lingkungan. Komponen padeye memiliki peran penting sebagai penghubung antara struktur dan sistem rigging, sehingga perlu dianalisis untuk memastikan keamanannya terhadap beban yang bekerja. Penelitian ini bertujuan untuk menganalisis tegangan pada padeye serta mengevaluasi pengaruh konfigurasi rigging dan kondisi lingkungan selama proses instalasi. Analisis dilakukan menggunakan simulasi statis dan dinamis, serta analisis lokal berbasis metode elemen hingga untuk memperoleh tegangan lokal pada struktur secara detail. Hasil penelitian menunjukkan bahwa penggunaan spreader bar mampu menurunkan sling tension dari 375,27 kN menjadi 171,21 kN. Unity check (UC) maksimum pada struktur adalah 0,59 tanpa spreader bar dan 0,55 dengan spreader bar, sementara spreader bar memiliki UC tertinggi sebesar 0,88. Tegangan lokal maksimum pada padeye sebesar 364,52 MPa di area sambungan dan kemudian dilakukan ekstrapolasi tegangan untuk mendapatkan hot spot stress sebesar 247,98 MPa yang masih berada di bawah batas tegangan ijin material sebesar 294 MPa.
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The installation of a Pipeline End Manifold (PLEM) is a critical stage in offshore subsea operations, particularly during the lowering process through the splash zone where environmental loads significantly affect structural response. The padeye serves as a key load transfer component between the lifting system and the structure, requiring careful evaluation to ensure structural integrity. This study aims to assess the stress distribution on the padeye and evaluate the influence of rigging configurations and environmental conditions during installation. Numerical analyses were conducted using static and dynamic simulations, complemented by local finite element analysis to obtain detailed local stress on the structure. The results indicate that the use of a spreader bar reduces the maximum sling tension from 375.27 kN to 171.21 kN. The maximum unity check values are 0.59 without a spreader bar and 0.55 with a spreader bar, while the spreader bar itself exhibits the highest unity check of 0.88. The maximum stress on the padeye reaches 364.52 MPa at the weld toe region with an extrapolated hot spot stress of 247.98 MPa, which remains below the allowable yield strength of material is 294 MPa.

Item Type: Thesis (Other)
Uncontrolled Keywords: Metode Elemen Hingga, Pipeline End Manifold, Padeye, Subsea Installation, Sling Tension.
Subjects: 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 Fathoni Al Fadh
Date Deposited: 22 Jun 2026 05:39
Last Modified: 22 Jun 2026 05:39
URI: http://repository.its.ac.id/id/eprint/133974

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