Analisis Tegangan Lokal pada Trunnion dengan Variasi Permodelan Trunnion pada Proses Lifting Jacket Structure Tahap Instalasi

Mukana, Fenno Pranadinata (2023) Analisis Tegangan Lokal pada Trunnion dengan Variasi Permodelan Trunnion pada Proses Lifting Jacket Structure Tahap Instalasi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kegiatan eksplorasi dan eksploitasi minyak di Indonesia semakin banyak dilakukan demi memenuhi permintaan pasar yang tinggi akan produk minyak dan gas bumi. Kegiatan eksplorasi dan eksploitasi minyak dan gas bumi yang dilakukan di laut ditandai dengan banyaknya anjungan lepas pantai yang terpasang dan beroprasi di wilayah laut Indonesia. Anjungan lepas pantai adalah struktur atau bangunan yang dibangun di lepas pantai untuk mendukung proses eksplorasi atau eksploitasi bahan tambang. Sebelum anjungan–anjungan tersebut terpancang di tengah laut dengan gagah, dilakukan mulai dari tahap fabrikasi, loadout, instalasi, sampai bisa dioperasikan. Pada tahap fabrikasi anjungan lepas pantai diproduksi dan di satukan sampai menjadi utuh yaitu bagian topside structure dan bagian jacket structure.
Kemudian pada tahap loadout adalah proses memindahkan structure menuju barge atau kapal untuk dibawa menuju lokasi instalasi dengan menggunakan metode lifting. Metode lifting
sendiri adalah proses mengangkat suatu struktur untuk dilakukan proses instalasi. Pada penelitian ini dilakukan lifting jacket structure. Permodelan jacket structure dilakukan menggunakan software SACS dan dilakukan analisis secara statis dan di dapat Unity Check pada structure jacket bagian trunnion ke 2 sebesar 0.41 dengan status aman. Selanjutnya dilakukan permodelan crane barge menggunakan software MOSES sebagai input untuk simulasi lifting pada software Orcaflex. Pada simulasi lifting software Orcaflex didapat pergerakan crane barge serta efektifitas tegangan pada sling yang dinyatakan aman dan lifting berhasil. Selanjutnya dilakukan analisis tegangan lokal pada struktur trunnion dengan variasi dua bentuk trunnion. Didapat hasil tegangan trunnion pada model pertama sebesar 46.41 Mpa dan pada model kedua sebesar 35.30 Mpa sehingga dapat disimpulkan bentuk trunnion yang paling sesuai adalah pada model ke 2 dikarenakan tegangannya lebih kecil.

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Exploration and exploitation activities of oil in Indonesia are increasingly being conducted to meet the high market demand for oil and natural gas products. Exploration and exploitation activities of oil and gas in the sea are characterized by the presence of numerous offshore platforms that are installed and operated in Indonesian waters. Offshore platforms are structures or buildings built offshore to support the exploration or exploitation process of mineral resources. Before these platforms are erected in the middle of the sea, various stages are carried out, starting from fabrication, loadout, installation, until they can be operational.
During the fabrication stage, the offshore platforms are produced and assembled to form a complete structure, consisting of the topside structure and jacket structure. Then, during the loadout stage, the process of transferring the structure to a barge or ship is carried out to transport it to the installation location using the lifting method. The lifting method itself involves the process of lifting a structure for installation purposes. In this study, the lifting of the jacket structure was performed. The jacket structure was modeled using SACS software and analyzed statically, resulting in a Unity Check of 0.41 for the second trunnion section, indicating that it is safe. Next, the crane barge was modeled using MOSES software as input
for the lifting simulation in Orcaflex software. The Orcaflex software simulation provided the movement of the crane barge and the effectiveness of the tension in the sling, which was deemed safe, and the lifting operation was successful. Furthermore, a local stress analysis was
conducted on the trunnion structure with two variations of trunnion shapes. The results showed a trunnion stress of 46.41 MPa for the first model and 35.30 MPa for the second model, indicating that the trunnion shape in the second model is more suitable as it has a lower stress level.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Anjungan Lepas Pantai, Jacket Structure, Lifting, Trunnion, Offshore Platforms, Jacket Structure, Lifting, Trunnion
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Fenno Pranadinata Mukana
Date Deposited:	20 Jul 2023 08:25
Last Modified:	20 Jul 2023 08:25
URI:	http://repository.its.ac.id/id/eprint/98751

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