Pengaruh Offloading Terhadap Umur kelelahan Sistem Tambat Studi Kasus PAPA Terminal

Aulia, Annisa (2023) Pengaruh Offloading Terhadap Umur kelelahan Sistem Tambat Studi Kasus PAPA Terminal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Selama umur operasi, sistem tambat dari Floating Storage and Offloading (FSO) rentan mengalami kelelahan karena terus menerima beban lingkungan yang bersifat siklis utamanya dari gelombang. Selain menerima beban siklis dari lingkungan, sistem tambat juga menerima beban dari proses transfer muatan dari FSO ke kapal tanker (offloading). Proses offloading dapat memberikan beban tambahan akibat pergerakan tanker yang kemudian akan mempengaruhi FSO dan sistem tambatnya. Pada umumnya, offloading dapat dilakukan dengan konfigurasi tandem atau side-by-side. Oleh karena offloading terus dilakukan secara periodik selama FSO beroperasi, maka dalam penelitian ini akan mengkaji pengaruh offloading dengan konfigurasi tandem dan side-by-side terhadap umur kelelahan sistem tambat FSO. Analisis diawali dengan simulasi dinamis selama 3 jam sesuai minum standard yang berlaku untuk mendapatkan tension history dari mooring chain. Kemudian dilanjutkan dengan menghitung tension range dan jumlah siklus dari tension history menggunakan metode rainflow counting dan menghitung cumulative damage sesuai miner’s rule. Hasil damage pada konfigurasi tandem dan side-by-side kemudian akan dibobotkan sesuai peluang terjadinya offloading. Dengan asumsi offloading 5% dalam setahun, didapatkan pengurangan umur sistem tambat akibat offloading adalah 0.06% untuk tandem dan 5.3% untuk side-by-side.
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During its operating life, the mooring system of Floating Storage and Offloading (FSO) is prone to fatigue due to continuously receiving cyclical environmental loads, mainly from waves. In addition to receiving cyclical loads from the environment, the mooring system also receives loads from the process of transferring cargo from FSO to tankers called as offloading. The offloading process can provide an additional force due to the motion of tankers which will have an impact on FSO motion and its mooring system. In general, offloading can be done in a tandem or side-by-side configuration. Because offloading continues to be carried out periodically while the FSO is in operation, this study will examine the effect of offloading with a tandem and side-by-side configuration on the fatigue life of the FSO mooring system. The analysis begins with a dynamic simulation for 3 hours according to the applicable standards to obtain the tension history of the mooring chain. Then proceed with calculating the tension range and the number of cycles from the tension history using the rainflow counting method and calculating the cumulative damage according to the miner's rule. Damage results in tandem and side-by-side configurations will then be weighted according to the chance of offloading. Assuming 5% offloading in a year, the reduction in mooring system life due to offloading is 0.06% for tandem and 5.3% for side-by-side.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Mooring line, Rainflow Counting, Tandem, Side-by-side
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Annisa Aulia
Date Deposited:	21 Jul 2023 02:54
Last Modified:	21 Jul 2023 02:54
URI:	http://repository.its.ac.id/id/eprint/98795

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