Analisis Keandalan Sistem Tambat Single Point Mooring (SPM) pada Kondisi Accidental Limit State (ALS)

Rahadian, Sabrina Alma Etania Aliffiari (2025) Analisis Keandalan Sistem Tambat Single Point Mooring (SPM) pada Kondisi Accidental Limit State (ALS). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Single Point Mooring (SPM) merupakan salah satu fasilitas terapung lepas pantai yang digunakan sebagai tempat kapal menambat sekaligus sebagai sebuah sistem transfer product. Sebuah sistem tambat harus memiliki keandalan yang cukup untuk dapat bertahan dengan berbagai macam kondisi lingkungan. Oleh karena itu, Tugas Akhir ini melakukan studi teknis terkait keandalan sistem tambat SPM dengan tipe Catenary Anchored Leg Mooring (CALM) dengan subsea hose berupa chinese lantern dengan kapal tanker yang tertambat pada SPM. Analisis dilakukan dengan fokus terhadap hasil keandalan pada saat kondisi accidental limit state (ALS) atau yang biasa disebut dengan kondisi one line damaged. Analisis dilakukan dengan variasi pembebanan lingkungann yaitu: collinear, non-collinear 1, non-collinear 2 sesuai ketentuan DNV. Analisis keandalan dilakukan menggunakan metode Mean Value First Order Second Moment (MVFOSM), meliputi keandalan pada tension mooring line, tension subsea hose, dan juga minimum bending radius (MBR) subsea hose. Hasil analisis yaitu pada ketiga kriteria, keandalan pada kondisi ALS jauh lebih rendah daripada kondisi ULS. Kondisi ALS menyebabkan peningkatan hasil tension mooring line dan tension subsea hose serta pada saat yang sama menyebabkan penurunan MBR pada subsea hose. Validasi keandalan menggunakan batas indeks keandalan (β) yang ditetapkan oleh Yong Bai (2003) yaitu sebesar 3.09. Hasil indeks keandalan terendah yang didapatkan pada mooring chain ketika kondisi ALS yaitu sebesar 2.80, sementara saat kondisi ULS yaitu sebesar 4.94. Kemudian indeks keandalan terendah pada subsea hose ketika kondisi ALS yaitu sebesar 1.12, sementara saat kondisi ULS yaitu sebesar 1.47.
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The Single Point Mooring (SPM) system is a type of offshore floating facility used for both mooring vessels and transferring products. A mooring system must demonstrate adequate reliability to withstand various environmental conditions. Therefore, this Final Project conducts a technical study on the reliability of a Catenary Anchored Leg Mooring (CALM) type SPM system with a chinese lantern-type subsea hose, moored to a tanker vessel. The reliability analysis is focused on the Accidental Limit State (ALS) condition, commonly referred to as the "one line damaged" scenario. The analysis involves environmental loading variations based on DNV standards: collinear, non-collinear 1, and non-collinear 2. The reliability assessment is performed using the Mean Value First Order Second Moment (MVFOSM) method, covering mooring line tension, subsea hose tension, and the minimum bending radius (MBR) of the subsea hose. The results show that under ALS conditions, the system’s reliability is significantly lower than in Ultimate Limit State (ULS) conditions. ALS conditions lead to increased tension in both the mooring line and subsea hose, while simultaneously reducing the MBR of the subsea hose. Reliability validation is conducted using the reliability index threshold (β) proposed by Yong Bai (2003), which is 3.09. The lowest reliability index obtained for the mooring chain under ALS conditions is 2.80, compared to 4.94 under ULS. For the subsea hose, the lowest reliability index under ALS is 1.12, while under ULS it is 1.47.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ALS, Keandalan, Mooring Lines, MVFOSM, Single Point Mooring, Mooring Lines, Reliability, Accidental Limit State.
Subjects:	V Naval Science > VK > VK361 Mooring of ships. Dry docks 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) > Offshore Engineering > 54040-(S1) Undergraduate Thesis
Depositing User:	Sabrina Alma Etania Aliffiari Rahadian
Date Deposited:	27 Jul 2025 08:57
Last Modified:	27 Jul 2025 08:57
URI:	http://repository.its.ac.id/id/eprint/122039

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