Analisis Respon Dinamis Tension Leg Platform Pada Saat Proses Pelepasan Tendon

Ahsani, Alkahfi Isham (2025) Analisis Respon Dinamis Tension Leg Platform Pada Saat Proses Pelepasan Tendon. Other thesis, INSTITUT TEKNOLOGI SEPULUH NOPEMBER.

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Abstract

Tahap pelepasan tendon merupakan salah satu proses dalam decommissioning Tension Leg Platform (TLP) yang memerlukan perhatian khusus. Penelitian ini bertujuan untuk menganalisis respon tegangan dan pergerakan struktur TLP selama proses pelepasan tendon. Simulasi dilakukan menggunakan perangkat lunak MOSES Executive dengan pendekatan analisis domain waktu. Hasil dari penelitian ini menunjukkan bahwa pelepasan tendon secara berurutan menyebabkan distribusi tegangan yang tidak merata. Pada pelepasan satu hingga empat pengaturan tegangan dilakukan dengan penambahan ballast secara merata. Besar tegangan maksimum pelepasan satu hinggan empat berturut-turut 838.97, 688.34, 1138.83, dan 996.61 ton. Pada pelepasan kelima, metode yang digunakan adalah variasi persen ballast. Percobaan persen ballast dilakukan sebanyak delapan iterasi hingga akhirnya mendapatkan tegangan yang aman. Pelepasan keenam dan ketujuh menggunakan metode variasi ballast dan support crane. Crane disimulasikan dengan menurunkan pretension tendon yang tersisa hingga tegangan dalam kondisi aman. Besar tegangan tendon SH pada pelepasan ketujuh sebelum support crane sebesar 2025.63 ton, kemudian tegangan yang dihasilkan menggunakan support crane sebesar 1637.3 ton. Pergerakan struktur juga mengalami peningkatan terutama gerakan surge meningkat dari 2.092 m menjadi 3.156 m, serta heave dari 0.299 m menjadi 0.547 m.
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The tendon release stage is one of the processes in Tension Leg Platform (TLP) decommissioning that requires special attention. This study aims to analyze the stress response and movement of the TLP structure during the tendon release process. Simulations were conducted using MOSES Executive software with a time domain analysis approach. The results of this study show that the sequential release of tendons causes uneven stress distribution. In releasing one to four, stress regulation is done by adding ballast evenly. The maximum stresses of one to four releases were 838.97, 688.34, 1138.83, and 996.61 tons, respectively. In the fifth discharge, the method used is the variation of ballast percent. The ballast percent experiment was carried out as many as eight iterations until finally getting a safe stress. The sixth and seventh releases used the ballast variation method and crane support. The crane was simulated by lowering the remaining tendon pretension until the tension was in a safe condition. The amount of SH tendon tension at the seventh release before the support crane was 2025.63 tons, then the resulting tension using the support crane was 1637.3 tons. The movement of the structure also increased, especially the surge movement increased from 2.092 m to 3.156 m, and heave from 0.299 m to 0.547 m.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Tension Leg Platform, Tendon, Analisis Dinamis, Pembongkaran, Tendon, Dynamic Analysis, Decommissioning
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:	Alkahfi Isham Ahsani
Date Deposited:	17 Jul 2025 07:54
Last Modified:	17 Jul 2025 08:20
URI:	http://repository.its.ac.id/id/eprint/119964

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