Analisis Probabilitas Terjadinya Line Clashing pada Catenary Anchored Leg Mooring dengan Konfigurasi Quadraple Subsea Hose

Alhafiz, Gumilang (2024) Analisis Probabilitas Terjadinya Line Clashing pada Catenary Anchored Leg Mooring dengan Konfigurasi Quadraple Subsea Hose. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perhatian global terhadap emisi karbon telah mendorong IMO (International Maritime Organization) dalam mendukung sustainable development goal (SDG) nomor 13 dengan mengambil tindakan tegas untuk mengatasi perubahan iklim. Hal ini telah meningkatkan tren kebutuhan akan struktur terapung yang lebih ringan dan fleksibel untuk kegiatan operasi yang ramah lingkungan. Oleh karena itu, Penelitian ini melakukan studi teknis terkait sistem pada mooring terminal menggunakan Catenary Anchored Leg Mooring (CALM) dengan empat konfigurasi subsea hose tipe chinese lantern dan lazy s yang ditambatkan ke fasilitas Floating, Storage, dan Offloading (FSO). Karena sifatnya yang fleksibel, clashing antara subsea hose dapat terjadi pada kondisi lingkungan yang ekstrim. Fenomena clashing dapat menyebabkan kerusakan pada lapisan terluar subsea hose dan kegagalan akibat dampak clashing yang terjadi secara berulang. Berdasarkan fenomena tersebut, perlu dilakukan analisis probabilitas terjadinya clashing akibat penggunaan empat subsea hose. Penelitian ini menyimulasikan simulasi dinamis, lalu menganalisis gaya tarik, minimum bending radius, bending moment, gaya geser, dan momen puntir yang dihasilkan serta kemungkinan terjadinya clashing antara subsea hose dengan objek lainnya. Disisi lain, sebelum melakukan simulasi dinamis, perlu dilakukan pengecekan stabilitas struktur buoy dikarenakan terjadi modifikasi konfigurasi dari kondisi eksistingnya. Hasil penelitian menunjukkan dengan adanya penambahan konfigurasi subsea hose menyebabkan penambahan draft buoy menjadi 2.73m, meningkat sebesar 14.9% dari draft kondisi terinstal. Kondisi Accidental Limit State (ALS) pada rantai jangkar menyebabkan peningkatan bending moment, gaya tarik, momen puntir dan gaya geser pada subsea hose pada end-A (SPM) secara berturut-turut sebesar 8%, 1%, dan 4%. Sedangkan peningkatan bending moment, gaya tarik, momen puntir, dan gaya geser pada subsea hose di koneksi end-B (PLEM) secara berturut-turut sebesar 30%, 29%, 4%, dan 25%. Disisi lain, kondisi ALS menyebabkan penurunan bending radius pada subsea hose sebesar 6%. Selain itu, probabilitas terjadinya line clashing subsea hose pada kondisi ALS lebih besar dibandingkan kondisi Ultimate Limit State (ULS) dengan probabilitas berturut-turut sebesar 7.5 × 10^-5 dan 1.6 × 10^-2. Dengan kata lain, putusnya rantai jangkar menyebabkan probabilitas line clashing meningkat sebesar 21235%.
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Global attention to carbon emissions has prompted the International Maritime Organization (IMO) to support Sustainable Development Goal (SDG) number 13 by taking decisive action to address climate change. This has increased the trend towards lighter and more flexible floating structures for environmentally friendly operational activities. Therefore, this research conducts a technical study on the mooring terminal system using Catenary Anchored Leg Mooring (CALM) with four subsea hose configurations of the Chinese lantern and lazy S types anchored to a Floating, Storage, and Offloading (FSO) facility. Due to their flexible nature, clashing between subsea hoses can occur under extreme environmental conditions. This clashing phenomenon can cause damage to the outer layers of subsea hoses and failures due to repeated clashing impacts. Based on this phenomenon, it is necessary to analyze the probability of clashing due to the use of four subsea hoses. This study simulates dynamic simulations and then analyzes the tensile forces, minimum bending radius, bending moment, shear forces, and torsion moments produced, as well as the potential for clashing between the subsea hoses and other objects. On the other hand, before conducting dynamic simulations, the stability of the buoy structure must be checked due to modifications from its existing configuration. The results show that the addition of the subsea hose configuration causes the buoy draft to increase to 2.73 meters, an increase of 14.9% from the installed condition draft. The Accidental Limit State (ALS) condition on the anchor chain results in increased bending moments, tensile forces, torsion moments, and shear forces on the subsea hose at end-A (SPM) by 8%, 1%, and 4%, respectively. Meanwhile, the increase in bending moments, tensile forces, torsion moments, and shear forces on the subsea hose at the end-B connection (PLEM) are 30%, 29%, 4%, and 25%, respectively. On the other hand, the ALS condition causes a reduction in the bending radius of the subsea hose by 6%. Additionally, the probability of subsea hose line clashing in ALS conditions is higher than in Ultimate Limit State (ULS) conditions, with probabilities of 7.5×10^(-5) and 1.6×10^(-2) respectively. In other words, the breaking of the anchor chain increases the probability of line clashing by 21,235%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Stability, Line Clashing, Subsea Hose, Probability
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:	Gumilang Alhafiz
Date Deposited:	26 Jul 2024 02:36
Last Modified:	26 Jul 2024 02:36
URI:	http://repository.its.ac.id/id/eprint/108915

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