Rizaldy, Dedy (2023) Pengaruh Pre-Tension Mooring Lines Pada Operabilitas Marine Loading Arm Dan Tegangan Tali Pada Sistem Jetty Mooring Kapal LNG Carrier 210,000 Dwt (Studi Kasus: LNG Loading DOCK 2). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada proses distribusi LNG, penggunaan kapal dinilai lebih ekonomis dibandingkan dengan pipa bawah laut karena gas alam dapat disimpan dalam jumlah besar dalam bentuk cair. LNGC memiliki tangki kargo yang lebar sehingga memiliki dampak free surface yang sangat besar. Desain struktural MLA, verifikasi kekuatan manifold LNGC dan posisi dalam operational envelope sangat penting untuk memastikan keamanan operasi. Analisis operabilitas terperinci harus dilakukan untuk mennentukan kondisi dan lingkungan critical loading untuk offloading system. Dalam proses pemindahan LNG dari terminal menuju kapal atau daratan dibutuhkan mooring. Untuk menentukan keamanan tali tambatan selama operasi, penentuan nilai Maximum Breaking Load (MBL) tali dengan nilai tegangan operasi maksimum perlu dilakukan. Dalam analisis Time Domain, tegangan pada mooring lines dapat diberi pre-tension guna mempertahankan tegangan maksimum tidak melewati MBL dan juga membatasi gerak kapal pada saat tertambat. Pre-tension juga meningkatkan gaya reaksi fender secara signifikan. Berdasarkan hasil analisis yang telah dilakukan nilai maximum tension tertinggi terjadi pada saat Hs 50 Tahun dengan pre-tension 20% MBL senilai 169.52 kN dan marine loading arm dapat beroperasi dengan aman pada saat posisi kapal dengan kondisi Maximum Allowable Draft pada saat highest water level (HWL), sedangkan pada saat Normal Ballast Draft, marine loading arm dapat beroperasi dengan aman sepenuhnya.
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In the LNG distribution process, the use of ships is considered more economical than underwater pipelines because natural gas can be stored in large quantities in its liquefied form. LNG carriers (LNGCs) have wide cargo tanks, resulting in a significant free surface effect. The structural design of the manifold LNGC, verification of its strength, and its position within the operational envelope are crucial to ensure operational safety. Detailed operability analysis must be conducted to determine the critical loading conditions and environment for the offloading system. Mooring is required during the transfer of LNG from the terminal to the ship or land. To ensure the safety of mooring lines during operations, the Maximum Breaking Load (MBL) of the ropes needs to be determined considering the maximum operational tension. In Time Domain analysis, pre-tension can be applied to maintain the maximum tension below the MBL and limit the vessel's movement while moored. Pre-tension also significantly increases the fender reaction force. Based on the conducted analysis, the highest maximum tension occurs during the Hs 50-Year condition with a pre-tension of 20% of MBL, reaching a value of 169.52 kN. The marine loading arm can operate safely when the vessel is at the Maximum Allowable Draft position during the highest water level (HWL), while during the Normal Ballast Draft, the marine loading arm can operate safely without any issues.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | LNGC, Jetty Mooring, Marine Loading Arm, Pre-Tension LNG Carrier |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC205 Harbors--Design and construction. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Dedy Rizaldy |
| Date Deposited: | 20 Jul 2023 08:47 |
| Last Modified: | 20 Jul 2023 08:47 |
| URI: | http://repository.its.ac.id/id/eprint/98744 |
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