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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS REKAYASA JIPM (Jurnal Ilmiah Pendidikan Matematika) IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Transportasi: Sistem, Material, dan Infrastruktur Wave: Jurnal Ilmiah Teknologi Maritim International Journal of Marine Engineering Innovation and Research Jurnal Jalasena Sewagati
Murdjito Murdjito
Department Of Ocean Engineering Institut Teknologi Sepuluh Nopember
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Experimental Study and Numerical Analysis of Crane Operability in Floating Crane Catamaran Rizky Arrico Farhan; Eko Budi Djatmiko; Murdjito Murdjito; Abdul Ghofur
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 2 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10930

Abstract

Crane vessel is a floating structure equipped with accommodation facilities and one or more cranes to do work in the field. Crane vessel continue to be developed so that they can lift large structures and operate safely in certain environmental conditions. The work that is usually done by crane vessel is to lift heavy or light loads from land to ship, from ship to land, from ship to sea, from sea to ship, and from ship to ship. The process of moving loads carried out by a crane vessel usually called the lifting process. In carrying out its work, a crane vessel is limited by certain criteria for safety reasons. One of them is the criterion that limits the heave motion at the end of the crane boom and roll and pitch motion of the crane vessel. In this final project, an experimental study and numerical analysis of crane operability were carried out on catamaran hulled crane vessel. Experiments were carried out at the Balai Teknologi Hidrodinamika BPPT and numerical analysis using the MOSES software. According to the criteria used, namely Operational Limitations of Offshore Crane Vessels, cranes on floating crane catamaran have the highest operability when the vessel heading is 0o to the direction of the incoming waves, which is up to Hs 1.45 m.
Fatigue Life Analysis of Mooring System: The Effect of Asymmetry Mooring System Configuration on Single Point Mooring Revy Maghriza; Eko Budi Djatmiko; Murdjito Murdjito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 2 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10932

Abstract

This journal explains the fatigue life analysis of anchor chain in the stand-alone single point mooring by comparing the 4x1 asymmetric and symmetrical mooring system configurations to determine whether the effect of the asymmetrical mooring system configuration on the fatigue life of the anchor chain is related to the length of the mooring lines, the pretensions of the mooring lines, and the angle of spread. The analysis was reviewed on the condition of ULS and FLS environmental loading based on API RP 2 SK code using Orcaflex with 3 hours of time- domain simulation. In the ULS condition, the symmetrical configuration can withstand environmental loads better in the direction of 0o and 180o with the generated maximum tension and maximum offset value smaller than the result from asymmetrical configuration. While the asymmetrical configuration can withstand environmental loads better in the direction of 90o and 270o with the generated maximum tension and maximum offset value smaller than the result from symmetrical configuration. In the FLS condition, the asymmetrical configuration has a longer minimum fatigue life and design life of anchor chain than the symmetrical configuration. This happens because of the spread angle of the mooring line, the length of the mooring line, and the pretension of the mooring line
The Study of Mooring Buoy Operability to Support Offloading Operation of Shuttle Tankers with Various Capacities Mochammad Afif Zahiru Fajar; Eko Budi Djatmiko; Murdjito Murdjito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 1 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8704

Abstract

This study was conducted to analyse of the operability of mooring buoy initially designed for offloading operation of 35,000 DWT shuttle tankers enhanced to serve the offloading operations of shuttle tankers with 50,000 DWT, 75,000 DWT, and 111,000 DWT capacities. Operability is reviewed in term of mooring line tensions induced by each new variation of tanker capacity under environmental conditions of 1-year, 10-year, and 100-year recurrence. The governing criteria is that the safety factor should meet the appropriate limit as stated in the API RP2SK. Tension on the mooring line increases in parallel with the increasing of tanker capacity. For the case of 35,000 DWT and 50,000 DWT shuttle tankers the operation can be performed in all environmental conditions. For the case of 75,000 DWT shuttle tanker with full load and 67% DWT capacity can fully operate in all environmental conditions, but with 47% DWT capacity could not be operated in the 100-year environmental condition with significant wave height 3.31 m for the direction of inline-L1, inline-L2, and between line-L1&L4. For the case of 111,000 DWT shuttle tanker at all capacity conditions can fully operate in the 1-year environmental condition with significant wave height up to 1.48 m.
Experimental & Numerical Studies of Vertical Motion Acceleration Analysis in Helideck on a Catamaran Floating Crane Yunan Setiawan Suwandono; Eko Budi Djatmiko; Murdjito Murdjito; Abdul Ghofur
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9955

Abstract

This research discusses the operability of vertical acceleration in the helideck. The experiment was carried out at the Maneuvering and Ocean Engineering Basin (MOB) facility of the BPPT-ITS Hydrodynamics Technology Center. The model being tested is the catamaran type with a scale of 1:36 to the original scale. Experimental testing using random waves with a Pierson-maskowitz spectrum with Hs = 2.5 and Hs = 6.37 m. The helideck only performs surge sway and heave tests. Meanwhile, numerical analyzes the effects of regular waves at heading 00 450 900 1350 1800 and obtained RAO for Heave, Roll, Pitch movements. For the analysis of landing operability at Helideck using the Olson and Marine criteria, where the limit of wave height according to Olson is obtained, namely for the incoming wave direction of 00, 900,1800, it should not be done more than 3 meters of wave height, while for conditions 450 and 1350 should not be above 4 meters. . For the HCA category, the critical condition when the direction of the wave of 900 with a wave height of 2 meters. At an altitude of 4 meters is the limit of the wave direction 00 450 1350 1800.
Experimental Study and Numerical Analysis of Floating Crane Catamaran Mooring Tension in Intact and Damage Conditions Using Time-Domain Approach Mochamad Hanif Rafi’i; Eko Budi Djatmiko; Murdjito Murdjito; Erdina Arianti
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9957

Abstract

Floating Crane Catamaran equipped with a mooring system to keep stable while operating. During operation, wave load causes tension on the mooring system. In this study, the tension of the mooring system was analyzed using experimental studies and numerical analysis with intact and damaged mooring conditions. Experimental studies were carried out by simulating a physical model in the Ocean Basin Maneuvering Laboratory, BTH-BPPT. While numerical using related software. Mooring tension analysis is carried out using the frequency domain approach which refers to the API RP 2SK rules. The sum of the average tension, significant low frequency tension and maximum wave frequency tension is the maximum tension of the mooring system. The low frequency tension and wave frequency tension is obtained by the low-band-pass filter process. The stochastic value is obtained by the FFT of low frequency and wave frequency tension. The results of maximum tension from experimental and numerical at intact conditions, wave headings 90°, Hs  2.5 m, are 373.7 kN and 441.6 kN and at Hs  6.37 m are 565.6 kN and 1741.5 kN. In the damaged condition, wave heading 90°, Hs 2.5 m, the maximum tension is 863.9 kN and 2113.3 kN.
Fatigue Life Comparison of Modified and Conventional 3 Leg Jacket Offshore Structure Muhammad Nabil Ghiffary; Murdjito Murdjito; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 2 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i2.9306

Abstract

The jacket structure must be adapted to the conditions of the production field to support economic factors. So, the concept of a modular platform for minimal, low-cost facilities is adopted. However, the design differences will affect the performance of the jacket itself, in other words a modular jacket can withstand the same load as a conventional jacket model but has a different structural performance. Therefore, this research discusses the performance comparison, which includes the fatigue life and the natural period, between conventional and modular jacket structures, which in this study are referred to as modified jackets. Conventional jacket as a comparison structure takes the design basis of the modified structure, including the same structural profiles, and environmental loads. In this study, the two jackets will only be modeled on the jacket part and the superstructure will be modeled as a joint load on the three upper ends of the jacket legs. Fatigue life analysis in this study used the full spectral analysis method. By using SACS software, the natural period of modified jacket is 1.756 s and conventional jacket is 1.472 s. While the lowest fatigue life on modified jacket is 44.98 years and conventional jacket is 9125.79 years.
Risk Analysis of Decommissioning Process: Case Studies of Lima-Compresor Platform Arif Windiargo; Daniel Mohammad Rosyid; Murdjito Murdjito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 1 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8705

Abstract

The process of petroleum exploration and exploitation is a crucial activity in the fulfillment of energy needs in the world. The process of petroleum exploration and exploitation is currently centred on shallow water regions in the continental shelf. In the process of petroleum exploration and exploitation in shallow waters, the structure of which is commonly used is the jacket structure. In Southeast Asia there are about 1300 platforms, of which 80% is over 20 years old. When the platform has reached its operational limit, according to the ministerial regulation of ESDM number 1 year 2011 The platform must be decommissioning in accordance with existing technical standards. In the process of demolition, there are certainly risks and hazards that can interfere with the process of decommissioning. It is necessary to do a risk analysis to map the risks that can occur while preparing the mitigation steps. In this study, risk analysis arel conducted by determining the activity that has a significant degree of hazard where it is concluded that activities that have a significant risk level are activities related to construction, lifting, maintenance, well service, and maintenance. From each activity that has a significant hazard level, there was a process of determining the cause of risk using the Fault Tree Analysis (FTA) method while determining the barrier that serves to prevent a risk occurring. The next is to determine the impact that can be inflicted from risk by using the Event Tree Analyis (ETA) method while determining the barrier that serves to prevent and reduce the impact that occurs when there is a peril. These two FTA and ETA diagrams are combined to create a Bowtie diagram to explain in detail the risk management performed at each stage of the decommisiioning process.
Local Stress Analysis in the Chain Link of Mooring Line That Had Diameter Degradation Rafliansyah Azhar Putera; Eko Budi Djatmiko; Murdjito Murdjito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 5, No 1 (2021)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i3.9952

Abstract

Mooring systems are used to moored ships at a particular area. One of its type is SPM by using a buoy. The system generally uses chains used to tie buoys to the seabed. However, chains that are used continuously can experience degradation in the diameter of the chain connection. The degradation experienced by the connections between the chains will certainly affect the local ( von Mises stress).  According to ABS rules, the amount of local stress or von Mises stress that occurs on an object must not exceed 90% of the yield strength of the material. Therefore, it is necessary to do a local stress analysis to determine the extent of degradation of the diameter of the chain connection so that the local stress value does not exceed that allowed. The largest mooring tension value that occurs in the mooring system is 1838,252 kN. The results show that if the chain connection is subject to a tension of 1838,252 kN, the diameter degradation that occurs in the chain connection must not exceed 15% of the initial diameter so that the local or von Mises stress does not exceed 369 MPa (90% of the yield strength of the material 410 MPa).
Experimental and Numerical Study on Roll Damping Structure of Floating Crane Catamaran in Free Floating and Moored Conditions Muhamad Fadkhurrohman Aziz; Eko Budi Djatmiko; Murdjito Murdjito; Baharuddin Ali
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 4, No 2 (2020)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i2.9341

Abstract

This research discusses the experimental study of free decay test This research discusses related to the experimental study of free decay test motion roll on the catamaran floating crane structure which is reviewed from free-floating and moored conditions. Experiments were conducted on the facilities of Maneuvering and Ocean Engineering Basin owned by the BTH – BPPT. The structure used as an experiment was a model of the catamaran floating crane with a scale of 1:36. The test is carried out with a horizontal mooring link system Taken from mooring system modelling, spring stiffness is used as a reference for mooring rope stiffness in numerical analysis. The analysis carried out in this final project is to compare the experimental results of the decay test with the results of the analysis using Moses software. From the results of the experiments obtained a comparison of free-floating conditions to tethered to decay tests of 38%, 8%, and 9% for linear damping values, then 93%, 12%, and 13% for quadratic damping values. Comparison of experiment results to numerical results found a difference of 128.39% for decay test 1 for quadratic damping value, then in decay test 2 and decay test 3 against the numerical got difference of 60.80% and 66.83% in linear damping value.
Model Transportasi Pengiriman Ikan Segar untuk Industri Pengolahan Ikan (Studi Kasus Industri Surimi di Jawa Tengah) Margie Wiendy Christianingrum; Murdjito Murdjito; Hasan Iqbal Nur
Jurnal Transportasi: Sistem, Material, dan Infrastruktur Vol 1, No 2 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat - Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1591.472 KB) | DOI: 10.12962/j26226847.v1i2.5037

Abstract

Kebijakan yang telah dikeluarkan pemerintah melalui Peraturan Menteri Kelautan dan Perikanan KP No 2 tahun 2015 tentang larangan penggunaan alat penangkapan ikan pukat hela (trawls) dan pukat tarik (seine nets), tak hanya berdampak pada nelayan, namun juga berdampak pada industri surimi, terutama industri surimi yang berada di Jawa Tengah. Lebih dari 80% pabrik surimi tidak beroperasi lagi karena kesulitan mendapatkan bahan baku (ikan demersal). Tujuan dari penelitian ini adalah untuk menentukan model logistik pengangkutan ikan bahan baku surimi yang optimum dari masing-masing opsi lokasi pemasok dengan menggunakan bahan baku ikan alternatif. Metode yang digunakan dalam penelitian ini adalah metode optimasi. Dari hasil analisis yang telah dilakukan bahan baku alternatif pengganti yang akan digunakan adalah ikan tenggiri, ikan kakap merah, ikan tigawaja dan ikan beloso. Alat angkut yang digunakan adalah kapal pengangkut ikan. Dari proses optimasi, skenario pengiriman melalui titik hub PPS Kendari memiliki biaya satuan yang paling minimum yakni Rp. 2,686 per kg. 5 rute yang terpilih dalam model tersebut antara lain, Rute 1 PPN Sungai Liat – PPP Tasik Agung dengan kargo ikan terkirim 13.389 ton/tahun, Rute 3 PPS Kendari – PPP Tasik Agung (16.750 ton/tahun), Rute 4 PPS Kendari – PPN Pekalongan (16.848 ton/tahun), Rute 5 PPN Ambon – PPS Kendari (21.570 ton/tahun), dan Rute 7 PPI Likupang – PPS Kendari (6.131 ton/tahun). Penambahan biaya transportasi akan menambah biaya produksi sebesar 15%.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Azhim Abdul Ghofur Abi Latiful Hakim Arda Arda Arif Windiargo Asmajuna, Helmi Arif Baharuddin Ali Basuki Rachmad Busse, Wolfgang Daniel M. Rosyid Dewinta Putri Cahyaningtyas Dhanistha, Wimala Lalitya Djatmiko , Eko Budi Djatmiko, Eko Budi Dwi Hariyanti Edit Prihantika Eka Wahyu Ardi Eko B. Dtjamiko Eko Budi Djatmiko Eko Budi Djatmiko Erdina Arianti Frestiqauli, Santi Hafizh Muhammad Naufal Shidqi Handayanu Handayanu Haryo Dwito Armono Hasan Iqbal Nur Helmi Arif Asmajuna Kunthi U.D. Prabawani Kurniati, Nani Madea Eka Silfiani Mahmud Mustain Margie Wiendy Christianingrum Mirba H. Dwi Sa'dyah Mochamad Hanif Rafi’i Mochammad Afif Zahiru Fajar Muhamad Fadkhurrohman Aziz Muhammad Badrus Zaman Muhammad Nabil Ghiffary Noviyanti, Irma Nugroho, Setyo Nur Syahroni Pravitasari, Inneke Yulistanty Raditya D. Riyanto Rafliansyah Azhar Putera Resy Agatya Revy Maghriza Ridha Rokhani, Ridha Rizky Arrico Farhan Rosyid, Daniel Mohammad Rudi W. Prastianto Rudi Walujo Prastianto Rudy W. Prastianto Sambodho, Kriyo Satrio Agi Nugraha Setyo Nugroho Setyo Nugroho Shade Rahmawati Sholihin Silvianita, Silvianita Sri Sumardiani Sujantoko Sujantoko Vebby A. Kurniawan Wahyudi Wisnu Wardhana Wolfgang Busse Wolfgang Busse Yeyes Mulyadi Yunan Setiawan Suwandono Zikra, Muhammad