Shintarahayu, Balqis (2017) Pengembangan Perangkat Lunak Untuk Analisa Trayektori Jangkar Terkait Risiko Akibat Terseret Jangkar Pada Pipa Gas Bawah Air. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Peletakan pipa bawah laut pada wilayah pelayaran tentunya mempunyai risiko terjadinya bahaya. Pemicu bahaya yang mungkin terjadi dapat disebabkan oleh ship shinking, drop anchor, dan drag anchor. Dalam kasus penelitian ini, akan dianalisis trayektori jangkar terhadap offshore gas pipeline yang melewati daerah labuh jangkar terhadap bahaya dari drag anchor.
Penetrasi dan trayektori drag anchor pada tanah dasar laut tidak hanya ditentukan oleh jenis jangkar dan tanah, tetapi juga dipengaruhi oleh garis instalasi dari suatu jangkar terutama segmen embedded di dalam tanah. Segmen dari garis instalasi pada air laut disebut garis catenary, segmen pada permukaan dasar laut disebut garis horizontal, dan segmen tertanam dalam tanah, yang memberikan kelengkungan terbalik dibandingkan dengan garis catenary, disebut garis embedded.
Pada penelitian sebelumnya tentang metode analisa untuk posisi jangkar pada tanah dasar laut oleh Zhang Wei (2015) menunjukkan bahwa sistem interaksional antara drag anchor dan garis instalasi pertama kali diperkenalkan untuk analisis posisi jangkar. Berdasarkan dua model mekanik untuk embedded line dan drag anchor, persamaan posisi untuk drag anchor telah diturunkan persamaan baik untuk tanah kohesif dan non-kohesif. Metode analisis untuk drag anchor yang menggabungkan sistem interaksional antara drag anchor dan garis instalasi telah memberikan pendekatan teori untuk mengamati perilaku jangkar di tanah. Dengan menggunakan alat bantu komputer dan aplikasi perkantoran yang telah ada seperti VBA pada Microsoft Excel, pergerakan trayektori jangkar dikembangkan sehingga diperoleh pengembangan perangkat lunak untuk analisa trayektori jangkar terkait risiko akibat terseret jangkar pada pipa gas bawah air yang melewati daerah labuh jangkar pada studi kasus di Selat Madura untuk menstimulasikan posisi jangkar pada kondisi di titik jarak aman.
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The laying of subsea gas pipeline on the sailing area
have a high risk of danger. Ship sinking, drop anchor, and drag
anchor could cause the risk that may occured. In the case of this
study, will be analyzed anchor trajectories against subsea gas
pipeline passing through the anchoring area towards the dangers
of drag anchor.
Drag anchors positioning in seabed soils are firmly
affected not only by the anchor and soil properties, but also by
the installation line characteristics, particularly the segment of
embedded in the soil. The segment of the installation line in the
seawater is called the catenary line, the segment on the seafloor
surface is called the horizontal line, and the segment embedded in
soils, which presents a reverse curvature compared with the
catenary line, is called the embedded line.
On the previous study, the analytical method for
positioning drag anchors on the seafloor surface by Zhang Wei
(2015) showed that the interactional system between the drag
anchor and installation line is initially introduced for the analysis
of anchor positioning. Based on the two mechanical models for
embedded lines and drag anchors, the positioning equations for
drag anchors have been derived both for cohesive and
noncohesive soils. The analytical method for positioning drag anchors which combines the interactional system between the
drag anchor and the installation line has provided a reasonable
theoretic approach to investigate the anchor behaviors in soils.
By using computer tools and office applications that
already exist such as VBA in Microsoft Excel, the movement of
anchor trajectory was developed to obtain development of
software for anchor trajectory to be applied for drag anchor
analysis on subsea gas pipeline passing through the area of
anchoring on the case study in Madura Strait to stimulate the
anchor position on the conditions at the point of a safety distance.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Anchor Trajectory; Catenary Line; Dragged Anchor; Embedded Line |
| Subjects: | V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | - BALQIS SHINTARAHAYU |
| Date Deposited: | 06 Mar 2017 08:12 |
| Last Modified: | 06 Mar 2019 03:01 |
| URI: | http://repository.its.ac.id/id/eprint/2908 |
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