Budiman, Muhammad Arief (2019) Analisis Umur Kelelahan Sistem Tambat Pengaruh Konfigurasi Mooring System pada Single Point Mooring. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Dalam tugas akhir ini penulis menganalisis umur kelelahan struktur Anchor Legs pada Single Point Mooring (SPM) dengan membandingkan 2 konfigurasi Mooring System yaitu 6×1 dan 2×1+2×2. Analisis ini dilakukan untuk mengetahui perbedaan masa operasi struktur Anchor Legs kedua konfigurasi Mooring System dengan mempertimbangkan umur kelelahannya dalam kondisi FSO disconnected dan kriteria Intact Stability akibat beban lingkungan Fatigue Limit State (FLS). Penelitian diawali dengan melakukan analisis karakteristik gerak dari FSO dan SPM dalam keadaan free floating. Setelah itu dilakukan analisis statis pada sistem tambat SPM untuk mendapatkan besar tension maksimum yang terjadi pada Anchor Legs dan melakukan pengecekan kekuatan berdasarkan kriteria API RP 2SK. Kemudian dilakukan analisis dinamis untuk mengetahui offset maksimum SPM dan tension maksimum yg dapat terjadi pada kedua konfiguasi mooring system. Lalu dilakukan simulasi pembebanan pada SPM dalam kondisi Stand Alone dengan beban lingkungan Fatigue Limit State (FLS). Setelah itu Fatigue Analysis dilakukan dengan melakukan perhitungan siklus tiap Stress Range berdasarkan data seri waktu tiap sea state dengan metode Rainflow Counting. Kemudian Fatigue Damage tahunan struktur Anchor Legs ditentukan berdasarkan hukum kegagalan Palmgren-Miner dengan S-N Curve. Sehingga umur kelelahan (Fatigue Life) struktur Anchor Legs pada kedua konfigurasi Mooring System dapat dihitung. Berdasarkan hasil pemodelan numerik dengan software OrcaFlex 9.2 didapatkan bahwa offset maksimum dari SPM pada konfigurasi mooring system 6×1 dan 2×1+2×2 berturut-turut yaitu 4.391 m dan 4.720 m. Kemudian tension maksimum yang terjadi pada Anchor Legs¬-nya berturut-turut yaitu 772.248 kN dengan SF 9.83 dan 1250.605 kN dengan SF 6.07. Sedangkan umur kelelahan struktur minimum dari sistem tambat berturut-turut yaitu 443 tahun dan 33 tahun selama umur operasi.
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In this final project the author analyzes the Fatigue Life of the Anchor Legs structure on Single Point Mooring (SPM) by comparing 2 Mooring System configurations, 6×1 and 2×1+2×2. This analysis was conducted to determine the differences in the operating period of the Anchor Legs structure of both Mooring System configurations by considering the Fatigue Life in the FSO disconnected condition and the Intact Stability criteria due to Fatigue Limit State (FLS). The study begins by analyzing the motion characteristics of FSO and SPM in free floating conditions. After that a static analysis is performed on the SPM mooring system to get the maximum tension that occurs in Anchor Legs and to check the strength based on the API RP 2SK criteria. Then a dynamic analysis is performed to determine the maximum offset of SPM and the maximum tension that can occur in both mooring system configurations. Then a loading simulation on SPM is carried out in Stand Alone conditions with Fatigue Limit State (FLS). After that, Fatigue Analysis is done by calculating the cycle of each Stress Range based on the time history of each sea state using the Rainflow Counting method. Then annual Fatigue Damage of the Anchor Legs structures is determined based on Palmgren-Miner’s Rule with S-N Curve. So that the Fatigue Life of the Anchor Legs structure in both Mooring System configurations can be calculated. Based on the results of numerical model with OrcaFlex 9.2 software, it was found that the maximum offset of SPM in the 6 × 1 and 2 × 1 + 2 × 2 mooring system configurations was 4.391 m and 4.720 m, respectively. Then the maximum tension that occurs in the Anchor Legs is 772.248 kN with SF 9.83 and 1250.605 kN with SF 6.07. While the minimum Fatigue Life of the structure of the mooring system is 443 years and 33 years, respectively, during the operating life.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Anchor Legs, Single Point Mooring, Intact Stability, Fatigue Limit State, Fatigue Damage, Stress Range, Fatigue Analysis, S-N Curve |
| 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 Arief Budiman |
| Date Deposited: | 26 May 2026 04:16 |
| Last Modified: | 26 May 2026 04:16 |
| URI: | http://repository.its.ac.id/id/eprint/65544 |
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