Analisis Perilaku Tugboat Pada Variasi Kapasitas Tanker Selama Kondisi Operasi

Maulidiningsih, Kamilah Dwi (2021) Analisis Perilaku Tugboat Pada Variasi Kapasitas Tanker Selama Kondisi Operasi. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu jenis sistem tambat yang sering digunakan pada operasi sistem kelautan saat ini adalah Single Point Mooring (SPM) atau Single Buoy Mooring (SBM). Terminal SBM memungkinkan kapal tanker yang tertambat kepadanya untuk berputar 360° (weathervane) mengelilingi titik tambatnya sesuai akibat pengaruh dari kondisi lingkungan yang menimpanya. Dalam kondisi operasi yang konvensional (tanpa bantuan DP atau Dynamic Positioning), jarak antara kapal dengan SBM harus dikendalikan, salah satunya dengan menggunakan bantuan tarikan oleh tugboat. Penelitian ini bertujuan untuk melihat bagaimana perilaku dari tugboat dalam menjaga pergerakan tanker agar tidak terjadi tubrukan dengan SBM. Apabila tugboat bergeser dari posisi idealnya dan simpangan yang terbentuk melebihi dari batas amplitudo daerah operasinya, maka tugboat tersebut menjadi berkurang efektivitas fungsinya. Pada penelitian ini, sistem tambat yang digunakan oleh kapal tanker adalah SBM tipe CALM Buoy simetris 4x1, kemudian tanker tersebut ditarik di bagian buritan oleh tugboat yang memiliki bollard pull sebesar 70 ton. Variasi kapasitas tanker yang ditinjau adalah 50.000 DWT, 100.000 DWT, dan 150.000 DWT. Dari hasil penelitian, diketahui besar nilai tension maksimum pada hawser dan tugline, serta pergeseran maksimum tugboat pada masing-masing skenario kapasitas tanker terjadi pada arah pembebanan yang sama yaitu dari beam seas (90°) dengan sudut simpangan yang terbentuk masing-masing sebesar 17,02°, 17,36°, dan 16,09°. Dimana nilai tersebut masih berada dibawah batas zona operasi dari tug yaitu sebesar 30°, sehingga tugboat dengan bollard pull 70 ton masih mampu digunakan untuk tanker dengan kapasitas yang bervariasi selama kondisi operasinya.
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One type of mooring system that is often used in marine system operations nowadays is Single Point Mooring (SPM) or Single Buoy Mooring (SBM). The SBM terminal allows the moored tankers to rotate up to 360° (weathervaning) around its mooring point according to the influence of environmental conditions that befall it. Under conventional operating conditions (without the help of DP or Dynamic Positioning), the distance between the ship and the SBM must be controlled, one of which is by using tugboat towing assistance. This study aims to see how the behavior of the tugboat in maintaining the movement of the tanker so that there is no collision with the SBM. If the tugboat shifts from its ideal position and the deviation that is formed exceeds the amplitude limit of its operating area, then the tugboat becomes less effective in its function. In this study, the mooring system used by the tanker is a 4x1 symmetrical CALM Buoy type SBM, which the tanker is pulled at the stern by a tugboat that has a bollard pull of 70 tons. The variations in the capacity of the tankers used are 50,000 DWT, 100,000 DWT, and 150,000 DWT. From the results of the study, it is known that the maximum tension value on the hawser and tugline, as well as the maximum offset of the tugboat in each scenario of tanker capacity occurs in the same loading direction, namely from beam seas (90°) with a deviation angle formed respectively of 17,02°, 17.36°, and 16.09°. Where this value is still below the operating zone limit of the tug, which is 30°, so that a tugboat with a bollard pull of 70 tons can still be used for tankers with varying capacities during their operating conditions.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Static Towing, Tension, Hawser, Tugline, Offset Tugboat, Bollard Pull
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:	Kamilah Dwi Maulidiningsih
Date Deposited:	16 Aug 2021 05:42
Last Modified:	16 Aug 2021 05:42
URI:	http://repository.its.ac.id/id/eprint/86965

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