Rohman, Mohammad Nabil (2025) Analisis Perbandingan Tegangan pada Padeye saat Proses Upending Offshore Jacket Menggunakan Metode Statis dan Dinamis. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Permintaan terhadap minyak dan gas bumi semakin meningkat setiap tahunnya. Hal ini menyebabkan pembangunan anjungan lepas pantai juga semakin banyak dilakukan untuk memenuhi proses eksplorasi maupun eksploitasi migas. Dalam pembuatannya, jacket platform melalui banyak proses dari tahap fabrikasi hingga tahap instalasi. Salah satunya adalah proses upending. Upending menjadi salah satu proses yang kritis karena banyak variabel yang dapat memengaruhi tingkat keselamatannya. Faktor yang memengaruhi dapat berupa berat objek yang diangkat, stabilitas vessel dan objek yang diangkat, beban dinamis dari lingkungan dan operasi pengangkatan, dan lain sebagainya. Oleh karena itu, penelitian ini akan menganalisis beban sling proses upending menggunakan metode statis dan dinamis dengan kondisi normal, ULS, dan ALS. Analisis dinamis akan dilakukan menggunakan software MOSES dan ORCAFLEX. Sedangkan analisis statis dilakukan menggunakan software SACS. Selanjutnya, padeye yang mengalami beban sling terbesar akan dimodelkan dan dianalisis dalam software ANSYS untuk mengetahui besar tegangan dan deformasi yang dialami padeye. Dari hasil analisis statis dan dinamis, diketahui bahwa tension analisis statis lebih besar dibandingkan analisis dinamis dengan sling tension terbesar dialami oleh sling LA2-HK1 sebesar 1.771,5 kN. Integritas member dinyatakan aman dikarenakan UC < 1 pada setiap kondisi dengan UC terbesar dialami oleh member LB15-0080 yang merupakan conductor support pada elevasi 41,6 pada kondisi ULS. Untuk hasil analisis lokal pada struktur padeye diperoleh maximum stress sebesar 293,07 MPa untuk padeye LA2 dan sebesar 282,3 MPa untuk padeye LB1 yang terletak di sambungan main plate dan leg can. Sedangkan deformasi maksimum terjadi di sisi atas padeye sebesar 9,5 mm untuk LA2 dan sebesar 8,2mm untuk padeye LB1.
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The demand for oil and gas is increasing every year. This causes the construction of offshore platforms to be increasingly carried out to fulfill the process of exploration and exploitation of oil and gas. In its manufacture, the jacket platform goes through many processes from the fabrication stage to the installation stage. One of them is the upending process. Upending is one of the critical processes because there are many variables that can affect its safety level. The influencing factors can be the weight of the lifted object, the stability of the vessel and the lifted object, dynamic loads from the environment and lifting operations, and so on. Therefore, this research will analyze the sling load of the upending process using static and dynamic methods under normal, ULS, and ALS conditions. Dynamic analysis will be conducted using MOSES and ORCAFLEX software. Meanwhile, static analysis will be conducted using SACS software. Furthermore, the padeye that experiences the largest sling load will be modeled and analyzed in ANSYS software to determine the amount of stress and deformation experienced by the padeye. From the static and dynamic analysis results, it is known that the static analysis tension is greater than the dynamic analysis with the largest sling tension experienced by the LA2-HK1 sling of 1,771.5 kN. The integrity of the member is declared safe because UC < 1 in each condition with the largest UC experienced by member LB15-0080 which is a conductor support at elevation -41.6 in the ULS condition. For the results of local analysis on the padeye structure, maximum stress of 293.07 MPa was obtained for LA2 padeye and 282.3 MPa for LB1 padeye located at the connection of main plate and leg can. While the maximum deformation occurred on the top side of the padeye by 9.5 mm for LA2 and by 8.2mm for LB1 padeye.
Item Type: | Thesis (Other) |
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Uncontrolled Keywords: | Accident Limit State, Jacket, Padeye, Ultimate Limit State, Upending |
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: | Mohammad Nabil Rohman |
Date Deposited: | 20 May 2025 04:52 |
Last Modified: | 20 May 2025 04:52 |
URI: | http://repository.its.ac.id/id/eprint/119081 |
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