Rabbani, Zaki (2017) Analisa Kekuatan Sekat Bergelombang Kapal Tanker Menggunakan Metode Elemen Hingga. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pemasangan sekat bergelombang dalam tangki muat kapal tanker memiliki keuntungan dalam hal pembersihan tangki dan penambahan kapasitas tangki muat. Dalam perkembangan penggunaan sekat bergelombang pada kapal tanker, tangki muat dengan ketinggian lebih dari 16 m perlu dilakukan pemasangan konstruksi tambahan berupa lower stool dan diafragma sekat yang dapat mengurangi volume dan menganggu proses pembersihan tangki muat.
Dalam Tugas Akhir ini akan dilakukan analisis kekuatan sekat bergelombang dengan konstruksi tambahan berupa lower stool dan diafragma sekat untuk mendapatkan desain yang optimum. Data sekat bergelombang diambil dari data konstruksi tangki muat kapal tanker 17500 LTDW dengan ukuran ketinggian lower stool dan ketebalan diafragma sekat terpasang berurutan sebesar 1280 mm dan 14 mm. Dari data tersebut ditentukan variasi tinggi lower stool sebesar 895 mm, 1280 mm, dan 1790 mm; dan variasi tebal diafragma sekat sebesar 11 mm, 13 mm, dan 14 mm. Proses analisis dilakukan menggunakan model konstruksi sekat bergelombang yang dianalisis menggunakan metode elemen hingga. Dari proses analisis didapatkan nilai tegangan, deformasi, berat, dan volume konstruksi sekat bergelombang.
Nilai tegangan terkecil terjadi pada tinggi lower stool 1790 mm, sedangkan ketebalan diafragma sekat tidak berpengaruh pada nilai tegangan. Nilai deformasi terkecil terjadi pada tinggi lower stool 1790 mm, dan tebal diafragma sekat 14 mm. Konstruksi yang memiliki berat paling rendah memiliki ukuran tinggi lower stool 895 mm, dan tebal diafragma 11 mm. Volume tangki muat mengalami pengurangan terkecil pada konstruksi sekat bergelombang dengan ukuran tinggi lower stool 895 mm, dan tebal diafragma sekat 11 mm. Pada perhitungan tegangan, konstruksi sekat dengan tinggi lower stool 895 mm tidak memenuhi kriteria sehingga ukuran lower stool yang optimum adalah 1280 mm dengan tebal diafragma sekat 11 mm. Kontruksi tersebut memiliki nilai tegangan maksimum sebesar 278 MPa, nilai deformasi maksimum sebesar 8.283 mm, berat konstruksi 59.167 ton, dan volume konstruksi sebesar 79.548 m3.
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Installation of corrugated bulkhead in cargo tank has its own advantages in the means of tank cleaning process and increasing cargo tank. Corrugated bulkhead which is fitted in large cargo tank with the height of tank is more than 16 m, must be fitted with additional structures such as lower stool and bulkhead diaphragm. However, when those structures is fitted, the tank cargo capacity is reduced and they can be obstacles to tank cleaning process.
This Final Project will carry strength analysis for corrugated bulkhead with additional structure, such as lower stool and bulkhead diaphragm, to get the optimum design of those structures. Dimensional data of corrugated bulkhead obtained from technical data of 17500 LTDW oil tanker, where lower stool and bulkhead diaphragm are fitted on corrugated bulkhead with the height and thickness of 1280 mm and 14 mm. The existing dimensional data will be the base for determining the dimension of variations which will be analysed in this Final Project. The variations consist of three different heights of lower stool with three different thicknesses of bulkhead diaphragm; lower stool heights are 895 mm, 1280 mm, and 1790mm; and bulkhead diaphragm thicknesses are 14 mm, 13 mm, and 11mm. Strength analysis will be carried with corrugated bulkhead structural model and calculated using finite element methods. The value of stress, deformation, weight, and costruction volume will be obtained in the analysis process.
Minimum stress value found on the highest variaton of lower stool height, while variation of diaphragm thickness do not affect the stress value. Deformation with minimum value found on the highest lower stool; 1790 mm; and the thickest bulkhead diaphragm; 14 mm. While the value of construction weight and volume will be reach the minimum value on the lowest variation of lower stool; 895 mm; and the thinnest bulkhead diaphragm;11 mm. However, from the calculation of yield utilisation factor criteria for the lowest variation of lower stool does not meet the requirement, so the optimum dimension of lower stool will be at the hieght of 1280 mm with the thickness of bulkhead diaphragm is 11 mm. This variation have the value of maximum stress 278 MPa, maximum deformation 8.283 mm, construction weight 59.167 ton, dan construction volume 79.548 m3.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | corrugated bulkhead, lower stool, finite element method, strength analysis |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM163 Hulls (Naval architecture) |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | Zaki Rabbani . |
| Date Deposited: | 27 Jan 2021 02:22 |
| Last Modified: | 27 Jan 2021 02:22 |
| URI: | http://repository.its.ac.id/id/eprint/48144 |
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