Analisis Operabilitas pada Proses Pembongkaran Topside Platform dengan Metode Dinamis Akibat Beban Gelombang: Studi Kasus Platform XYZ

Amin, Muhammad Zakaria Al (2024) Analisis Operabilitas pada Proses Pembongkaran Topside Platform dengan Metode Dinamis Akibat Beban Gelombang: Studi Kasus Platform XYZ. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembongkaran topside merupakan salah satu kegiatan utama dalam proses decommissioning anjungan lepas pantai dengan salah satu metode dalam proses ini adalah reverse installation-single lift. Korosi, sebagai salah satu faktor permasalahan umum pada struktur baja dijadikan parameter dalam pengurangan kekuatan pada struktur topside. Pada analisis kekuatan struktur dengan pengurangan ketebalan sebesar 1.5mm, nilai unity check maksimum pada member dan joint masing-masing sebesar 0.854 dan 0.602. Sedangkan pada hasil analisis dinamis, tegangan pada hoisting line dan sling mengalami peningkatan seiring dengan bertambahnya tinggi gelombang dan periodenya. Respon peningkatan tegangan akibat beban gelombang mengalami peningkatan secara eksponensial. Arah pembebanan beam seas menghasilkan respon tegangan tertinggi akibat respon gerak roll terhadap crane barge. Hoisting line terpendek memiliki pengaruh terhadap tegangan akibat nilai kekakuan yang semakin tinggi dan mengakibatkan kecepatan dan percepatan pada gerak topside sebagai pendulum sehingga meningkatkan snap force. Pola ini juga berlaku terhadap nilai dynamic amplification factor (DAF) dan factor of safety (FOS) sling. Hasil distribution fitting pada nilai DAF, 3-Parameter Lognormal merupakan model distribusi yang tepat dengan nilai korelasi 0.999. Sehingga operabilitas operasi pada jangkauan kondisi model penelitian ini sebesar 89.4%.
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Topside removal is one of the main activities in the offshore platform decommissioning process, with one of the methods in this process being reverse installation-single lift. Corrosion, one of the common problem factors in steel structures, is used as a parameter to reduce the strength of topside structures. In the structural strength analysis with a thickness reduction of 1.5mm, the maximum unity check values for members and joints are 0.854 and 0.602, respectively. Meanwhile, the dynamic analysis results show that the hoisting line and sling tension increase with increasing wave height and period. The response to increasing tension due to wave loads increases exponentially. The beam seas loading direction produces the highest tension response due to the roll motion response to the crane barge. The shortest hoisting line influences tension due to the higher stiffness value, which results in velocity and acceleration in the topside movement as a pendulum, thereby increasing the snap force. This pattern also applies to the dynamic amplification factor (DAF) and factor of safety (FOS) sling values. The distribution fitting results on the DAF value, 3-Parameter Lognormal, is the correct distribution model with a correlation value 0.999. So, the operational operability in the range of conditions for this research model is 89.4%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Dekomisioning, Pembongkaran Topside, Pengangkatan, Beban Gelombang, Faktor Amplifikasi Dinamis, Decommissioning, Topside Removal, Wave Load, Lifting, Dynamic Amplification Factor.
Subjects:	Q Science > QC Physics > QC20.7.F67 Fourier transformations T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Zakaria Al Amin
Date Deposited:	26 Jul 2024 02:15
Last Modified:	26 Jul 2024 02:15
URI:	http://repository.its.ac.id/id/eprint/108881

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