Analisis Sistem Tambat Kondisi ULS dan ALS pada Keramba Jaring Apung Ocean Farm ITS (OFITS)

Mahdyansyah, Mohammad Hilmy (2023) Analisis Sistem Tambat Kondisi ULS dan ALS pada Keramba Jaring Apung Ocean Farm ITS (OFITS). Other thesis, Institut Teknologi Sepuluh Nopember.

	Text 04311940000120-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2025. Download (14MB) | Request a copy
	Text 04311940000120-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2025. Download (14MB) | Request a copy

Abstract

Potensi sektor kelautan Indonesia yang luar biasa dapat seimbangkan dengan budidaya ikan untuk mengatasi masalah overfishing. KJA Ocean Farm ITS adalah inovasi keramba jaring apung pertama di Indonesia, diterapkan di Desa Sidoasri, Malang, pada kedalaman 20 meter. Dalam Tugas Akhir ini akan dibahas tentang analisis sistem tambat kondisi ULS dan ALS pada keramba jaring apung Ocean Farm ITS. Analisa respon gerak pada gelombang regular disimulasikan melalui RAO (Response Amplitude Operator) pada saat free floating dengan hasil respon gerakan terbesar terjadi pada gerakan surge dan sway dengan nilai 5.629 m/m – 5.630 m/m pada frekuensi 0.029 rad/s. Analisis tension mooring system KJA Ocean Farm ITS ini dilakukan pada kondisi ULS baik saat operasi atau badai dengan simulasi time domain selama 10.800 detik. Tension terbesar terjadi saat gelombang ekstrim dalam kondisi ULS pada tali tambat MLC 1 pada arah pembebanan 180° sebesar 62.596 kN, MLC 2 pada arah pembebanan 135° sebesar 63.794 kN, MLD 1 pada arah pembebanan 135° sebesar 63.660 kN, dan MLD 2 dari arah pembebanan 90° sebesar 62.256 kN. Namun tension yang terjadi pada empat tali tambat tersebut tidak melebihi maximum tension yang diizinkan yakni 67.060 kN, yang artinya pada kondisi ULS saat gelombang ekstrim/badai seluruh tali tambat mampu bertahan. Dalam analisis anchor holding capacity pada sistem tambat KJA Ocean Farm ITS didapatkan anchor jenis flipper delta sangat cocok pada jenis tanah soft clay tempat KJA Ocean Farm ITS beroperasi. Flipper delta ini memiliki nilai weight in air (Wa) anchor sebesar 0.25 Ton dan holding capacity (Tm) sebesar 78.45 kN yang artinya jika dihubungkan dengan skenario accident maka nilai holding capacity tersebut hanya mampu menahan beban lingkungan pada saat simulasi skenario accidental 1 dengan minimal putus satu tali tambat. Dalam rekayasa accident, jika satu tali tambat putus, tali-tali lainnya masih mampu menahan beban lingkungan. Namun, saat tiga tali tambat putus, tali-tali lainnya tidak mampu menahan beban yang melebihi standar yang diizinkan. Total gaya tarik pada jaring sebesar 189.95 kN dengan efek kenaikan tension yang terjadi pada mooring line MLC 2 dan MLD 1 sebelum dan sesudah dilakukan pemodelan jaring sebesar 4,8% dengan tension pada MLC 2 sebesar 66,99 kN dan MLD 1 sebesar 66,94 kN.
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The tremendous potential of Indonesia's marine sector can be balanced with fish farming to overcome the problem of overfishing. KJA Ocean Farm ITS is the first floating net cage innovation in Indonesia, implemented in Sidoasri Village, Malang, at a depth of 20 meters. This Final Project will discuss the analysis of the mooring system under ULS and ALS conditions on the Ocean Farm ITS floating net cages. Analysis of motion response in regular waves is simulated through RAO (Response Amplitude Operator) when free floating with the results of the largest motion response occurring in surge and sway movements with a value of 5.629 m/m - 5.630 m/m at a frequency of 0.029 rad/s. The tension analysis of the ITS Ocean Farm KJA mooring system was carried out under ULS conditions either during operation or storms with a time domain simulation for 10,800 seconds. The largest tension occurred during extreme waves in ULS conditions on the MLC 1 mooring rope in the 180° loading direction of 62,596 kN, MLC 2 in the 135° loading direction of 63,794 kN, MLD 1 in the 135° loading direction of 63,660 kN, and MLD 2 from the 90° loading direction of 62,256 kN. However, the tension that occurs in the four mooring ropes does not exceed the maximum permissible tension of 67,060 kN, which means that under ULS conditions during extreme waves / storms all mooring ropes are able to survive. In analyzing the anchor holding capacity of the KJA Ocean Farm ITS mooring system, it is found that the flipper delta type anchor is very suitable for the soft clay soil type where the KJA Ocean Farm ITS operates. This delta flipper has an anchor weight in air (Wa) value of 0.25 tons and a holding capacity (Tm) of 78.45 kN, which means that if it is associated with an accident scenario, the holding capacity value is only able to withstand environmental loads during the simulation of accidental scenario 1 with at least one mooring rope breaking. In accident engineering, if one mooring rope breaks, the other ropes are still able to withstand environmental loads. However, when three mooring lines broke, the other lines were unable to withstand loads that exceeded the permitted standard. The total tensile force on the net is 189.95 kN with the effect of the increase in tension that occurs on the mooring lines MLC 2 and MLD 1 before and after net modeling of 4.8% with a tension on MLC 2 of 66.99 kN and MLD 1 of 66.94 kN.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	KJA Ocean Farm ITS, RAO, Tension, ULS dan ALS, Skenario Accident KJA Ocean Farm ITS, RAO, Tension, ULS and ALS, Accident Scenario KJA Ocean Farm ITS, RAO, Tension, ULS and ALS, Accident Scenario Ocean Farm ITS, RAO, Tension, ULS and ALS, Accident Scenario
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Hilmy Mahdyansyah
Date Deposited:	21 Jul 2023 03:07
Last Modified:	21 Jul 2023 03:07
URI:	http://repository.its.ac.id/id/eprint/98800

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