Analisis Operasi Instalasi Deck Extension Platform dengan Metode Static Rigging

Fahira, Dinda Alya (2026) Analisis Operasi Instalasi Deck Extension Platform dengan Metode Static Rigging. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Seiring meningkatnya kebutuhan kapasitas produksi pada platform yang telah beroperasi, dilakukan modifikasi berupa penambahan deck extension. Instalasi deck extension pada platform eksisting memerlukan metode static rigging karena adanya keterbatasan ruang antara main deck dan cellar deck. Penelitian ini bertujuan menganalisis proses lifting dan instalasi static rigging, mengevaluasi integritas lokal dan global struktur eksisting, serta menentukan spesifikasi peralatan dan kebutuhan minimum sambungan las pada deck extension. Analisis global dilakukan menggunakan SACS berdasarkan API RP 2A-WSD, sedangkan analisis lokal dilakukan menggunakan ANSYS. Hasil analisis menunjukkan bahwa konfigurasi lifting single hook dengan empat lifting point memenuhi kriteria kekuatan dengan nilai UC < 1.00 dan defleksi yang masih dalam batas izin. Pada analisis global instalasi static rigging, Skenario 1 menghasilkan UC maksimum sebesar 0.446 dengan gaya sling sebesar 5.377 MT, sedangkan Skenario 2 menghasilkan UC maksimum sebesar 0.472 dengan gaya sling sebesar 4.724 MT. Hasil analisis lokal menunjukkan tegangan Von Mises maksimum pada beam existing sebesar 73.84 MPa untuk Skenario 1, 207.5 MPa untuk Skenario 2, dan 125.678 MPa untuk Skenario 2 dengan penambahan stiffener. Seluruh nilai tersebut masih berada di bawah tegangan izin yield material sebesar 213 MPa. Berdasarkan hasil analisis, Skenario 2 dengan penambahan stiffener lebih direkomendasikan untuk diterapkan pada instalasi static rigging karena mampu mengurangi tegangan pada beam existing serta mempermudah proses instalasi sehingga lebih efisien.
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As production capacity requirements increase in existing operating platforms, platform modifications are required through the addition of deck extensions. The installation of a deck extension on an existing platform requires a static rigging method due to limited space between the main deck and cellar deck. This study aims to analyze the lifting and static rigging installation processes, evaluate the local and global integrity of the existing structure, and determine the equipment specifications and minimum welding requirements for the deck extension. Global analysis was performed using SACS based on API RP 2A-WSD, while local analysis was conducted using ANSYS. The results show that the single-hook lifting configuration with four lifting points meets the strength criteria, with a UC value of less than 1.00 and deflection within the allowable limit. In the global analysis of the static rigging installation, Scenario 1 resulted in a maximum UC of 0.446 with a maximum sling force of 5.377 MT, while Scenario 2 resulted in a maximum UC of 0.472 with a maximum sling force of 4.724 MT. The local analysis results show maximum Von Mises stresses in the existing beam of 73.84 MPa for Scenario 1, 207.5 MPa for Scenario 2, and 125.678 MPa for Scenario 2 with the addition of stiffeners. All stress values remain below the allowable stress of 213 MPa. Based on the analysis results, Scenario 2 with the addition of stiffeners is recommended for implementation because it reduces stress in the existing beam and facilitates the installation process, resulting in a more efficient installation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ANSYS, deck extension, lifting, SACS, static rigging ANSYS, deck extension, lifting, SACS, static rigging
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Dinda Alya Fahira
Date Deposited:	30 Jul 2026 01:56
Last Modified:	30 Jul 2026 01:56
URI:	http://repository.its.ac.id/id/eprint/140020

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