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Murdjito Murdjito
Department Of Ocean Engineering Institut Teknologi Sepuluh Nopember
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Reliability Analysis on the Effect of Subsea Buoy to the Tension of Spread Mooring System Madea Eka Silfiani; Rudi W. Prastianto; Murdjito Murdjito; Daniel M. Rosyid; Eko B. Dtjamiko
International Journal of Marine Engineering Innovation and Research Vol 8, No 4 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.19588

Abstract

A lot of research has been carried out regarding variations in mooring systems, one of which is the addition of buoys to the mooring system. In analyzing variations in mooring system designs, what needs to be considered is the reliability of the mooring lines. Therefore, in this research will analyze reliability on the effect of subsea buoy to the tension of mooring line with a variation position of subsea buoy. The variations on the position of one subsea buoy is arranged at the distance of the anchor 605 m, 577.5 m, 550 m, 522.5 and two subsea buoys at the distance from the anchor 605 m and 467.5 m. The analysis was performed for stand alone and offloading conditions with wave directions of 0 °, 45 °, 90 °, 135 °, 180 °. In this study to find the reliability of mooring lines, the author uses the Mean Value First Order Second Moment (MVFOSM) method. The results from this study, the probability of failure in the offloading condition without subsea buoy is 4.897E-17 and with subsea buoy (522.5 m) is 4.018E-17. Probability of failure in the stand alone condition without subsea buoy is 2.763E-16 and with subsea buoy (522.5 m) is 1.881E-16. From the probability of failure, the reliability of mooring lines in the offloading condition and stand alone condition without subsea buoy and with subsea buoy (522.5 m) is 1.00. The reliability calculation determined by DNV-OS E301, the results obtained meet the specified reliability criteria.
Optimalisasi Potensi Eco-Wisata Susur Sungai Kejawan Putih Tambak Kecamatan Mulyorejo Surabaya Timur Frestiqauli, Santi; Sujantoko, Sujantoko; Murdjito, Murdjito; Djatmiko , Eko Budi; Mustain, Mahmud; Dhanistha, Wimala Lalitya; Silvianita, Silvianita; Rahmawati, Shade
Sewagati Vol 9 No 1 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i1.2436

Abstract

Eco-wisata Susur Sungai Kejawan Putih Tambak terletak di kecamatan Mulyorejo, Surabaya Timur. Merupakan lokasi wisata alam yang menyediakan pengalaman menyusui sungai menggunakan sampan/perahu nelayan dengan menyugguhkan pemandangan mangrove hingga pemandangan jembatan Suramadu. Diresmikan pada Kamis, 27 Juli 2023 oleh walikota Surabaya Eri Cahyadi. Wisata susur sungai di kawasan Kejawan Putih Tambak menjadi salah satu pilihan wisata air di Kota Surabaya. Selain sebagai sarana wisata, tempat itu juga untuk menunjang perekonomian masyarakat, khususnya bagi para nelayan di Kejawan Putih Tambak. Menurut walikota Surabaya ketika terdapat susur sungai, secara otomatis sepanjang sungai itu harus terjaga kebersihan dan keindahannya. Namun, hingga pada saat ini (2025) wisata susur sungai masih sepi peminat. Hal ini bisa disebabkan oleh beberapa faktor, terutama pada infrastruktur penunjang. Oleh karena itu, dengan adanya pengabdian masyarakat ITS, optimalisasi potensi wisata susur sungai Kejawan Putih Tambak dilaksanakan untuk mengatasi keterbatasan infrastruktur yaitu dengan melakukan pendampingan desain pengembangan dermaga baru dan menghasilkan peta wisata susur sungai. Program ini sebagai wujud keberlangsungan komunitas yang berdampak pada masyarakat, lingkungan darat dan perairan
Experimental and Numerical Study on Roll Damping Structure of Floating Crane Catamaran in Free Floating and Moored Conditions Eko Budi Djatmiko; Murdjito Murdjito; Muhamad Fadkhurrohman Aziz; Baharuddin Ali
International Journal of Offshore and Coastal Engineering Vol. 4 No. 2 (2020)
Publisher : Department of Ocean Engineering

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.
Local Stress Analysis in the Chain Link of Mooring Line That Had Diameter Degradation Eko Budi Djatmiko; Murdjito Murdjito; Rafliansyah Azhar Putera
International Journal of Offshore and Coastal Engineering Vol. 5 No. 1 (2021)
Publisher : Department of Ocean Engineering

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 & Numerical Studies of Vertical Motion Acceleration Analysis in Helideck on a Catamaran Floating Crane Eko Budi Djatmiko; Murdjito Murdjito; Yunan Setiawan Suwandono; Abdul Ghofur
International Journal of Offshore and Coastal Engineering Vol. 5 No. 1 (2021)
Publisher : Department of Ocean Engineering

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 Eko Budi Djatmiko; Murdjito Murdjito; Mochamad Hanif Rafi’i; Erdina Arianti
International Journal of Offshore and Coastal Engineering Vol. 5 No. 1 (2021)
Publisher : Department of Ocean Engineering

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.
Experimental Study and Numerical Analysis of Crane Operability in Floating Crane Catamaran Eko Budi Djatmiko; Murdjito Murdjito; Rizky Arrico Farhan; Abdul Ghofur
International Journal of Offshore and Coastal Engineering Vol. 5 No. 2 (2021)
Publisher : Department of Ocean Engineering

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 Eko Budi Djatmiko; Murdjito Murdjito; Revy Maghriza
International Journal of Offshore and Coastal Engineering Vol. 5 No. 2 (2021)
Publisher : Department of Ocean Engineering

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
Analysis of the Effect of Sinker on Bearing Capacity of Anchor in Calm Buoy Mooring System: Case Study of SBM Pengapon Semarang Murdjito Murdjito; Eko Budi Djatmiko; Agnes Teresa Melani
International Journal of Offshore and Coastal Engineering Vol. 8 No. 1 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20465

Abstract

The addition of sinkers on the mooring line is generally used to support the anchor in maintaining its position in extreme environmental conditions. In this study, the author will analyze the effect of sinkers on the mooring line tension and the bearing capacity of the anchor. The sinker variations in this analysis are 10, 15, and 20 tons, which will be added to the asymmetric mooring line of CALM Buoy SPM Pengapon Semarang. The type of anchor SPM is Stevpris MK III on soft clay soil type. The author first analyses the line tension in each environmental loading condition and then analyses the anchor's bearing capacity. The analysis results show that the largest tension occurs in line 3 without a sinker in DEC conditions with an environmental load direction of 314.24 deg, 1301.19 kN (End A) and 1310.43 kN (End B). In the analysis of the holding capacity of the anchor, the author refers to the SOF ABS Class 2019 and the charts of Appendix D2 and D6 API RP 2SK. The results indicate that the gradation of weight and position of the sinker causes the line tension between the sinker and the fairlead to increase linearly, with an average percentage increase of 1.35%. Meanwhile, the bearing capacity of the anchor, which includes required holding capacity, anchor weight, and estimated drag distance/fluke length, decreased with an average percentage of 7.46%, 15.39%, and 4.79%. Based on the consideration of the End A tension analysis results in the DEC condition, it is stated that the 20-ton sinker in position 1 is a suitable variation of the sinker in this SPM Pengapon Semarang case study.
Pipeline End Manifold (PLEM) Structural Response Analysis due to the Settlement Process Ichwandanny Faturahman Darobi; Murdjito Murdjito; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4876

Abstract

Co-Authors A.A. Ketut Agung Cahyawan W Abdul Azhim Abdul Ghofur Abdul Ghofur Abi Latiful Hakim Agnes Teresa Melani Arda Arda Arif Windiargo Asmajuna, Helmi Arif Baharuddin Ali 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 Erdina Arianti Frestiqauli, Santi Hafizh Muhammad Naufal Shidqi Handayanu Handayanu Haryo Dwito Armono Hasan Ikhwani Hasan Iqbal Nur Helmi Arif Asmajuna Ichwandanny Faturahman Darobi Kunthi U.D. Prabawani Kurniati, Nani Madea Eka Silfiani Mahmud Mustain Margie Wiendy Christianingrum Mirba H. Dwi Sa'dyah Mochamad Hanif Rafi’i 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