Analisis Struktur Padeye pada Proses Lifting Topside Offloading Platform pada Tahap Loadout

Prayoga, Ilham Kharisma (2021) Analisis Struktur Padeye pada Proses Lifting Topside Offloading Platform pada Tahap Loadout. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Lifting merupakan salah satu metode dalam proses loadout. Lifting adalah kegiatan memindahkan struktur menggunakan bantuan alat crane. Proses loadout digunakan untuk memindahkan struktur dari yard ke barge. Dalam penelitian ini dilakukan analisis lifting pada struktur topside offloading platform. Dalam analisis yang dilakukan juga mempertimbangkan faktor pergeseran titik berat (center of gravity), faktor beban dinamis (DAF), dan faktor keamanan lain yang terjadi pada struktur saat proses lifting. faktor beban dinamis menggunakan Dynamic Amplification Factor. pergeseran cog saat lifting berpengaruh terhadap besar beban yang diangkat. Beban terbesar yang diterima oleh lifting point adalah 872,507 kN pada lifting point 3. Pada saat proses lifting tidak ditemukan kegagalan pada member struktur saat proses pengangkatan, dibuktikan dengan maksimum nilai UC adalah 0,87. Padeye yang digunakan didesain sesuai dengan kriteria DNV OS-H205. Dilakukan beberapa pengecekan terhadap struktur padeye yaitu perbandingan tegangan yang terjadi dengan tegangan ijin yang pada beberapa tinjauan tegangan seperti tensile stress, shear stress, dan bending stress. Analisis secara lokal juga dilakukan terhadap struktur padeye untuk mengetahui tengangan pada struktur padeye. analisis lokal pada struktur padeye dilakukan dengan menggunakan bantuan software ANSYS Workbench. Hasil dari analisis lokal menunjukan equivalent von-mises sebesar 164,96 MPa pada struktur padeye dan 140,04 MPa pada sambungan, dengan tegangan ijin material baja ASTM A36 sebesar 250 MPa.
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Lifting is one method in the loadout process. Lifting is the activity of moving the structure using the help of a crane. The loadout process is used to move the structure from the yard to the barge. In this study, a lifting analysis was carried out on the topside offloading platform structure. The analysis also considers the center of gravity shift factor, dynamic load factor (DAF), and other safety factors that occur in the structure during the lifting process. dynamic load factor using Dynamic Amplification Factor. Cog shift during lifting affects the amount of load being lifted. The biggest load received by the lifting point is 872.507 kN at lifting point 3. During the lifting process, no failure was found in the structural members during the lifting process, as evidenced by the maximum UC value of 0.87. The Padeye used is designed according to the DNV OS-H205 criteria. Several checks on the padeye structure were carried out, namely the comparison of the stress that occurred with the allowable stress on several stress reviews such as tensile stress, shear stress, and bending stress. Local analysis was also carried out on the padeye structure to determine the stress on the padeye structure. Local analysis of the padeye structure was carried out using the ANSYS Workbench software. The results of the local analysis showed the equivalent von-mises of 164.96 MPa in the padeye structure and 140.04 MPa at the joints, with the allowable stress of ASTM A36 steel material of 250 MPa.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Topside, Loadout, Lifting, Padeye.
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:	ilham kharisma prayoga
Date Deposited:	19 Aug 2021 02:02
Last Modified:	19 Aug 2021 02:02
URI:	http://repository.its.ac.id/id/eprint/87573

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