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All Journal BERKALA SAINSTEK TELEKONTRAN: Jurnal Ilmiah Telekomunikasi, Kendali dan Elektronika Terapan SAINTEK: Jurnal ilmiah Sains dan Teknologi Industri Ge-STRAM: Jurnal Perencanaan dan Rekayasa Sipil International Journal of Marine Engineering Innovation and Research Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Jurnal Techno Bahari Jurnal Jalasena
Kristiyono, Tri Agung
Program Studi Teknik Perkapalan, Fakultas Teknik Dan Ilmu Kelautan, Universitas Hang Tuah
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation

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Risk Evaluation of Ship Repair Delays with The Failure Modes and Effects Analysis (FMEA) Method Intan Baroroh; Ndaru Gilang Ramadhan; Didik Hardianto; Tri Agung Kristiyono
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5079

Abstract

Every ship, that is still actively operating in shipping must pay attention to repair or maintenance in accordance with classification standards. This was needed by management or ship owners to carry out maintenance planning. The shipyards as repair services, there are often obstacles during the repair process that cause the repair time to be longer. This is caused by limited work equipment, delivery of materials that are not in order, and lack of technical equipment. The purpose of research is to evaluate the risk of ship repair delays so there are no failures or delays in ship repair. The method used is the FMEA method (Failure Mode and Effect Analysis) to measure each failure in each activity that affects ship repair. The results showed an assessment score in the form of a Risk Priority Number (RPN) consisting of activities: amount of cutting machines is still limited with a score of 309.83, painting and welding failures at the same time with a score of 267.08, materials that come are remachined to fit the needs with a score of 335.06 and inadequate transportation equipment with a score of 294.16. Improvements made in the form of preparing amount of work tools before the work is carried out, conditioning the order of work according to the schedule and adding backup transportation.
Determination of Standard Time and Man Hours for Welding Process in Barge Repairs Mochammad Falah Adjidinata; Intan Baroroh; Tri Agung Kristiyono; Ali Azhar; Akhmad Basuki Widodo
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

Shipyards are facilities that play an important role in building and repairing ships. One common type of repair is replating, which means replacing damaged hull plates with new ones. This process relies heavily on welding, which needs skilled workers and a lot of electrodes. A frequent issue in the field is the challenge of estimating how many electrodes are needed, which often results in wasted materials, increased costs, and delays in completing the work. This study seeks to calculate the electrode needs, the time required for the work, and the man-hours needed for ship replating. The research involved a review of existing literature and a field study. The welding process used the SMAW method with E6013 electrodes, 160A current, and 2G and 3G welding positions. Each welding position involves three stages: root, filler, and capping. The average welding speed data for every 1000 mm is used to calculate the actual welding length in the replating process. The results showed that the average welding time for the 2G position was 39,277.89 minutes, while for the 3G position it was 17,657.54 minutes. The total electrode requirement was 1,619.69 kg, which is equal to 324 boxes, with an estimated cost of Rp. 40,240,800.00. Additionally, the number of workers needed is 27, with a total of 948.924 man-hours over a period of 5 days. In conclusion, organized calculations of electrode needs, time, and man-hours can help improve the efficiency of replating work, reduce waste, and aid in project management planning in shipyards.
in EVALUASI RISIKO KEHILANGAN ENERGI PADA BENGKEL FABRIKASI MENGGUNAKAN METODE BAYESIAN NETWORK Ridwan Efendy , Muhammad; Baroroh, Intan; Kristiyono, Tri Agung
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 7, Number 1, March 2026 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to analyze the risk of energy loss in ship fabrication processes at PT DUMAS Shipyard Surabaya using a Bayesian Network modeling approach. Energy losses were identified across six key processes: Sandblasting, Painting, Cutting, Forming, Welding, and Lifting Equipment (cranes, hoists, and forklifts). The Bayesian method was employed to model the probabilistic relationships among causal variables, including air pressure, cooling system performance, machine idle time, equipment condition, and operator behavior, all of which contribute to potential energy loss. Risk assessment was conducted by calculating likelihood and consequence values based on the AS/NZS 4360:2004 standard to determine the level of energy-related risk in each process. The results indicate that the Welding process has the highest probability of energy loss at 0.25 and is classified as a High Risk. Cutting, Sandblasting, and Painting fall under the Moderate Risk category, while Forming and Lifting Equipment are categorized as Low Risk. Recommended mitigation strategies include implementing automatic control systems for key equipment, enhancing operator training, and optimizing pneumatic and cooling systems. The energy risk evaluation serves as a basis for improving efficiency within the fabrication processes.
Analysis of the Machining Quality of Liner Plates Using Shaping, Turning, and Milling Methods in Shipbuilding Construction HARI, HARI SUSANTO; Kristiyono, Tri Agung
Techno Bahari Vol. 12 No. 2 (2025): Oktober
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v12i2.356

Abstract

Liner plate functions as a vibration damping pad between the foundation and heavy equipment such as windlass and main engine in ship construction. Dimensional accuracy and surface roughness are very important for the liner plate to produce optimal contact area. This study compares the quality of liner plate machining results using three methods: shaping, CNC milling, and turning. Evaluation parameters include dimensional precision (thickness), surface roughness (Ra), and production time efficiency. The results show that CNC milling provides the best quality in terms of precision and roughness, although it takes longer to process. The lathe shows balanced results between time efficiency and quality. The scrap machine is suitable for the initial stage of work but is less ideal for precise final results. This study can be a reference in selecting the optimal liner plate machining method in ship construction. Keywords: liner plate; machining; milling; shaping; turning.
Co-Authors Aditya, Bagus Kusuma Akhmad Basuki Widodo Ali Azhar Ali Azhar Ali Azhar Bagas Prabaswara Badrani Bagus Aditya Bagus Kusuma Aditya Bagus Kusuma Aditya Bagus Kusuma Aditya Bellarina, Elsy Putri Didik Hardianto Eko Febrianto Tarigan Elsy Putri Bellarina HARI, HARI SUSANTO Intan Baroroh Intan Baroroh Joko Subur Lasma, Novi Anggiat Mardhotillah, Zahro Wanda Mochammad Falah Adjidinata Ndaru Gilang Ramadhan Nuhman, Nuhman Nurul Rosana, Nurul Ridwan Efendy , Muhammad Rifandi, Safriudin Siswo Hadi Sumantri Suryadhi, Suryadhi Syahrul Setyo Pambudi Taufiqurrohman, Muh. Widyadharma, Indra