ANALISIS UMUR KELELAHAN MOORING LINE FLNG SAAT POSISI SIDE BY SIDE/ Submit Jurnal Transnav

Panca Rinda, Ratih (2026) ANALISIS UMUR KELELAHAN MOORING LINE FLNG SAAT POSISI SIDE BY SIDE/ Submit Jurnal Transnav. Bachelor thesis, Institut Teknologi Kalimantan.

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Abstract

Floating Liquefied Natural Gas (FLNG) memerlukan sistem tambatan (mooring system) untuk menjaga stabilitas selama operasi. Pada kondisi side-by-side antara FLNG dan LNG Carrier saat proses offloading, mooring line menerima beban siklik akibat gelombang, arus, dan angin yang dapat menyebabkan kerusakan kelelahan (fatigue). Penelitian ini bertujuan membandingkan nilai N-cycle menggunakan metode Rainflow Counting dan Spectral Method serta menentukan umur kelelahan mooring line FLNG. Analisis dilakukan menggunakan perangkat lunak OrcaFlex pada konfigurasi spread mooring berbahan chain dengan kondisi operasi side-by-side. Nilai N-cycle diperoleh dari analisis Rainflow Counting pada data time history tension dan Spectral Method berdasarkan spektrum respons gelombang, sedangkan analisis fatigue dilakukan menggunakan kurva T–N API RP 2SK dan aturan Palmgren–Miner. Hasil penelitian menunjukkan bahwa nilai N-cycle metode Spectral sebesar 690.397.666.574 siklus, sedangkan metode Rainflow Counting sebesar 14.298.880.579 siklus, sehingga metode Spectral menghasilkan nilai 48,28 kali lebih besar. Analisis fatigue menunjukkan bahwa Mooring Line 2 merupakan kondisi paling kritis dengan total damage 0,355502 dan fatigue life 2,81 tahun, diikuti Mooring Line 3 dengan total damage 0,314102 dan fatigue life 3,18 tahun. Meskipun demikian, seluruh mooring line masih memenuhi kriteria keamanan fatigue karena memiliki nilai kerusakan kumulatif D < 1. Hasil penelitian menunjukkan bahwa perbedaan pendekatan perhitungan menyebabkan perbedaan signifikan pada estimasi N-cycle, sementara umur kelelahan sangat dipengaruhi oleh besarnya beban siklik yang diterima oleh mooring line.

Item Type: Thesis (Bachelor)
Subjects: V Naval Science > V Naval Science (General)
Divisions: Jurusan Sains, Teknologi Pangan, dan Kemaritiman > Teknik Kelautan
Depositing User: ratih ratih pancarinda
Date Deposited: 09 Jul 2026 05:34
Last Modified: 09 Jul 2026 05:34
URI: http://repository.itk.ac.id/id/eprint/26202

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