Analisis Tegangan Lokal Maksimum Struktur 'Chain Stopper' pada 'Hexagonal Single Buoy Mooring' Terhadap FSO Saat Sistem 'Offloading'

Mustofa, Jamhari Hidayat Bin (2017) Analisis Tegangan Lokal Maksimum Struktur 'Chain Stopper' pada 'Hexagonal Single Buoy Mooring' Terhadap FSO Saat Sistem 'Offloading'. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis kekuatan pada struktur `chain stopper` pada `hexagonal` SBM CALM sangat diperlukan karena memiliki peranan penting untuk penghubung antara `buoy` dengan `seabed` yang berjumlah enam berupa `stud less chain` dalam masa operasinya. Analisis kekuatan strukturnya mengacu pada besaran maksimum tegangan ekuivalen Von Mises dengan `software` ANSYS `Mechanical` 16.2 untuk memenuhi kriteria jenis material ASTM A148 `Grade` 105-85 (`yield stress` 585 MPa) yang beroperasi di titik perairan Kepulauan Seribu. Hasil analisis statis pada struktur tersebut menunjukkan telah memenuhi kriterianya dengan tegangan Von Mises maksimumnya sebesar 328.69 MPa/0.94 (operasi) dan 463.53 MPa/0.99 (badai). Analisis berawal dengan perhitungan manual untuk mengetahui perbedaan titik berat kapal FSO saat `full load` dan `ballast` dengan metode regresi statistik berdasarkan data kapal pada umumnya. Selanjutnya, kapal FSO dan `hexagonal` SBM dimodelkan dengan `software` MOSES 7.0 untuk analisis respons strukturnya dan mendapatkan outputnya untuk diinputkan ke `software` Orcaflex 9.2 untuk analisis tegangan maksimum tiap `mooring line`. Tegangan maksimum yang didapatkan dari tiap skenario analisis selalu terjadi pada `mooring line` ke-1 dengan konfigurasi sistem tambat baik saat `in line` maupun `between line` sebesar 1178.73 kN (operasi) dan 1662.27 kN (badai). =============================================================== Strength analysis of chain stopper structure on Hexagonal SBM CALM is necessary because it has an important role to connect between buoy with seabed which amounts to six from stud less chain during its operation. Structural strength analysis refers to the maximum magnitude of Von Mises equivalent stress with ANSYS Mechanical 16.2 software to meet the criteria of material type ASTM A148Grade 105-85 (yield stress 585 MPa) operating at the point of waters of the Kepulauan Seribu. the ABS 2014 (ASTM A36) criteria operating at the point of waters of Kepulauan Seribu. The result of static analysis on the structure shows that it has let the criteria with maximum Von Mises voltage of 328.69 MPa/0.94 (operation) and 463.53 MPa/0.99 (storm). The analysis begins with manual calculations to determine the difference of FSO vessel weight during full load and ballast with statistical regression method based on ship data in general. Furthermore, the FSO and hexagonal SBM vessels are modeled with MOSES 7.0 software for structural response analysis and obtaining their outputs for input into Orcaflex 9.2 software for maximum stress analysis of each mooring line. Maximum stress obtained from each scenario analysis always occurs on the 1st mooring line (with mooring system configuration in line and in line between) of 1178.73 kN (operation) and 1662.27 kN (storm).

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 627.98 Mus a
Uncontrolled Keywords: chain stopper, FSO, hexagonal SBM CALM, Von Misestension.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
V Naval Science > V Naval Science (General)
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: - Jamhari Hidayat Bin Mustofa
Date Deposited: 02 Feb 2018 02:13
Last Modified: 08 Mar 2019 02:36
URI: http://repository.its.ac.id/id/eprint/45551

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