Analisis Umur Kelelahan Rantai Jangkar Fso Pengaruh Korosi Pada Studi Kasus Fso Di Papa Terminal

Cahyaningtyas, Dewinta Putri (2022) Analisis Umur Kelelahan Rantai Jangkar Fso Pengaruh Korosi Pada Studi Kasus Fso Di Papa Terminal. Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Dalam tugas akhir ini penulis menganalisis umur kelelahan rantai jangkar (anchorchain) yang digunakan untuk menambatkan FSO Gamkonora ke dasar laut. Analisis ini dilakukan untuk mengetahui masa operasi rantai jangkar dengan mempertimbangkan umur kelelahan. Penelitian dimulai dengan melakukan analisis mengenai pergerakan FSOG amkonora akibat beban lingkungan dalam kondisi free floating dan tertambat untuk mendapatkan besar tension pada setiap anchor chain. Selanjutnya menghitung besar tensionanchor chain pada semua variasi korosi, yaitu 0%, 5%, 10%, dan 15%. Setelah itu dilakukan perhitungan tension range dan menghitung nilai cumulative damage menggunakan metode TNCurve berdasarkan hukum kegagalan Palmgren Miner dengan mengestimasi kegagalan menggunakan metode rainflow counting. Dari hasil pemodelan numerik yang dilakukan, didapatkan bahwa perilaku gerak translasional terbesar pada FSO yaitu sebesar 1.409 m/m untuk gerakan heave dan gerak rotasional terbesar adalah 3.463 deg/m untuk gerakan roll saat kondisi FSO muatan full load. Untuk hasil tension terbesar pada anchor chain yaitu 1695.14 kN pada heading 90 saat kondisi 0% terkorosi dengan safety factor 4,53. Setelah itu didapatkan nilai cumulative damage dari T-N Curve dengan nilai terbesar 0,0702. Berdasarkan cumulative damage tersebut, umur kelelahan anchor chain yaitu 14,25 tahun selama umur operasi
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In this final project the author analyzes the fatigue life of the anchor chain used to anchor the Gamkonora FSO to the seabed. This analysis was conducted to determine the operating life of the anchor chain by considering the fatigue life. The study was started by conducting an analysis of the movement of amconoric FSOG due to environmental loads in free floating and moored conditions to obtain the amount of tension in each anchor chain. Next, calculate the tension anchor chain for all corrosion variations, namely 0%, 5%, 10% and 15%. After that, the tension range is calculated and the cumulative damage value is calculated using the TNCurve method based on Palmgren Miner's failure law by estimating failure using the rainflow counting method. From the results of numerical modeling, it was found that the largest translational motion behavior in the FSO is 1,409 m/m for the heave motion and the largest rotational motion is 3,463 deg/m for the roll motion when the FSO is full load. For the largest tension results on the anchor chain, namely 1695.14 kN at heading 90 when conditions are 0% corroded with a safety factor of 4.53. After that, the cumulative damage value from the T-N Curve is obtained with the largest value of 0.0702. Based on the cumulative damage, the fatigue life of the anchor chain is 14.25 years during its operating life

Item Type:	Thesis (Other)
Additional Information:	RSKe 627.22 Cah a-1
Uncontrolled Keywords:	Anchor Chain, Cumulative Damage, Fatigue Life, Rainflow Counting, Tension Range
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA467 Iron and Steel Corrosion and protection against corrosion
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	19 Dec 2022 02:18
Last Modified:	19 Dec 2022 02:31
URI:	http://repository.its.ac.id/id/eprint/95242

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