Bramana, Anzardisyah Bimasatya (2023) Analisis Konfigurasi Temporary Stool Pada Proses Fabrikasi Topside Offshore Converter Platform. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Anjungan offshore converter platform (OCP) merupakan infrastruktur yang krusial untuk menunjang kegiatan eksploitasi energi di lokasi lepas pantai, terutama untuk mendukung proses pengelolahan energi dari turbin angin lepas pantai. Sehingga, untuk membangun sebuah struktur topside dan jacket OCP, diperlukan proses fabrikasi dan konstruksi struktur pada fabrication yard yang ditopang oleh temporary stool dan upper grillage. Namun, dalam proses fabrikasi tersebut, temporary stool terpapar risiko terjadinya buckling dan penurunan tanah, sehingga dapat mengakibatkan berkurangnya efektifitas temporary stool dalam menopang struktur di atasnya. Oleh karena itu, analisis ini bertujuan untuk menentukan konfigurasi peletakan dan dimensi temporary stool yang tepat agar dapat menopang struktur topside yang sedang difabrikasi sampai selesai dengan aman. Pada penelitian Tugas Akhir ini, topside yang dikaji mempunyai berat 11641,800-ton dengan dimensi (LxWxH) 77,9 x 36,0 x 35,7 meter. Dengan menggunakan software SACS v11.3 untuk melakukan analisis statis, dapat diketahui nilai unity check masing-masing member struktur temporary stool, dan member kritis dianalisis menggunakan software ANSYS 19.2 untuk mengetahui tegangan dan deformasi lokal menggunakan pendekatan non-linier. Hasil analisis statis menunjukkan bahwa pada kondisi normal dan penurunan pondasi tanah terhadap temporary stool menunjukkan integritas struktur yang tidak aman karena member UC temporary stool, member deck topside dan defleksi yang melebihi batas minimum. Oleh karena itu, diberikan tiga iterasi modifikasi pada temporary stool dimana modifikasi ke-3 dengan menggunakan dimensi temporary stool OD323.9x17.48, dengan tegangan maksimum 302.58 MPa dan deformasi maksimum 5.705 mm. Oleh karena itu, modifikasi peletakan dan dimensi temporary stool tersebut dapat digunakan dalam proses fabrikasi dan dapat mengganti temporary stool dengan dimensi OD323.9x12.70, terutama pada titik-titik kritis
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Offshore converter platform (OCP) is a crucial infrastructure to support energy developments in offshore areas through wind energy, which are utilized by offshore wind turbines. Therefore, to construct the topside and jacket structure of the OCP, fabrication and construction process of the structure in a fabrication yard is necessary. This process is structurally supported by temporary stools and upper grillages. However, during the fabrication process the temporary stools are at risk of experiencing buckling and settlement, which will affect the effectiveness of the temporary stool in sustaining the weight of the OCP above. Therefore, the goal of this analysis is to determine the correct configuration and dimension of the temporary stools so that it can safely hold the weight of the OCP topside. In this research, the topside structure has a total weight of 11641.800-tons with the dimensions (LxWxH) of 77.9 x 36.0 x 35.7 m respectively. Using the SACS v11.3 software to conduct static analysis, the unity check of each member is known, and the critical temporary stool will be analyzed further with ANSYS for finite element method analysis to discover the local stress and deformation with a non-linier approach. Static analysis results in normal and settlement conditions indicates unsatisfactory structural integrity as the UC member and deflections on the structure during the fabrication process exceeds the maximum criteria. Hence, there are three modification iteration for the temporary stool where the third modification with the temporary stool dimension of OD323.9x17.48 achieved maximum stress of 302.58 MPa and maximum deformation of 5.705 mm. Accordingly, this temporary stool configuration and dimension can be used to support the fabrication process of the OCP and can possibly replace the OD323.9x12.70 temporary stool, especially in critical areas
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | deflection, offshore converter platform (OCP), settlement, temporary stool, unity check, defleksi, offshore conveter platform, penurunan tanah, temporary stool, unity check. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Anzardisyah Bimasatya Bramana |
| Date Deposited: | 17 Jul 2023 06:14 |
| Last Modified: | 17 Jul 2023 06:14 |
| URI: | http://repository.its.ac.id/id/eprint/98507 |
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