Studi Perancangan Berbasis Keandalan Untuk Rangka Penopang Topside Deck Anjungan Migas Pada Kondisi Load-Out

Rashad, Muhammad Syahzada Aqila (2025) Studi Perancangan Berbasis Keandalan Untuk Rangka Penopang Topside Deck Anjungan Migas Pada Kondisi Load-Out. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses fabrikasi dan load-out merupakan tahapan krusial dalam konstruksi struktur lepas pantai. Untuk menjamin keamanan dan mencegah kegagalan struktur selama proses tersebut, diperlukan Deck Support Frame (DSF) yang andal sebagai penopang sementara bagi topside. Penelitian ini mengkaji studi kasus fabrikasi topside anjungan migas tipe wellhead oleh suatu perusahaan fabrikator, dengan fokus utama pada perancangan DSF berbasis keandalan pada kondisi load-out, sesuai dengan kriteria metode instalasi float-over. Model pembebanan topside dikembangkan menggunakan perangkat lunak SACS dan divalidasi terhadap Weight Control Report (WCR) dengan toleransi deviasi maksimum 3%. Perancangan awal DSF melibatkan penentuan titik tumpuan topside yang didasarkan pada hasil pengujian integritas struktur. Dua konfigurasi DSF dikembangkan: Konfigurasi A (empat titik tumpuan) dan Konfigurasi B (enam titik tumpuan), yang masing-masing diuji integritasnya selama fase fabrikasi dan load-out. Hasil analisis menunjukkan kondisi kritis berupa loss-of-support pada salah satu skidshoe selama proses load-out, dengan unity check (UC) maksimum sebesar 8,75 untuk bagian tension pipe pada Konfigurasi A, dan 4,76 pada Konfigurasi B. Setelah dilakukan modifikasi pada anggota kritis, analisis keandalan dilanjutkan menggunakan Response Surface Method (RSM) dan simulasi Monte Carlo. Hasilnya menunjukkan tingkat keandalan tertinggi sebesar 99,94% untuk Konfigurasi A pada member upper crossbeam dan 99,93% untuk Konfigurasi B pada member truss. =================================================================================================================================
The fabrication and load-out processes are critical stages in offshore structure construction. To ensure structural safety and prevent failure during these phases, a reliable Deck Support Frame (DSF) is required to temporarily support the topside. This study presents a case study of the fabrication of a wellhead-type offshore topside by a fabrication company, focusing on the reliability-based design of the topside DSF under load-out conditions in accordance with float-over installation criteria. The structural loading model of the topside was developed using SACS software and validated against the topside Weight Control Report (WCR) within a 3% tolerance limit. The initial DSF design included determining the topside support points based on the results of structural integrity testing. Two DSF configurations were developed: Configuration A (four support points) and Configuration B (six support points), each assessed for structural integrity during the fabrication and load-out phases. The analysis revealed critical conditions involving loss-of-support at one of the skid shoes during load-out, resulting in maximum unity check (UC) of 8.75 for the DSF tension pipe member in Configuration A and 4.76 in Configuration B. Following modifications to the critical members, a reliability analysis was conducted using the Response Surface Method (RSM) and Monte Carlo simulations. The highest reliability was achieved at 99.94% for Configuration A on the upper crossbeam member and 99.93% for Configuration B on the truss member.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Topside, Deck Support Frame (DSF), load-out, keandalan, perancangan, fabrication, reliability, design
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Syahzada Aqila Rashad
Date Deposited:	21 Jul 2025 01:21
Last Modified:	21 Jul 2025 01:21
URI:	http://repository.its.ac.id/id/eprint/120151

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