Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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IDENTIKASI AKAR PENYEBAB KETERLAMBATAN PROYEK REPARASI KM. TAREX I MENGGUNAKAN FAULT TREE ANALYSIS (FTA)
Full text linkDelays in ship repair projects are common issues that can disrupt operational schedules and increase operational costs. This study aims to identify the root causes of the delay in the KM. TAREX I repair project, which experienced a delay of 11 days from the initial schedule. The Fault Tree Analysis (FTA) method was employed to systematically analyze the contributing factors by constructing a fault tree diagram and calculating the Minimal Cut Set. The analysis revealed five main factors contributing to the delay: labor, additional work outside the repair list, material supply, limited supporting production facilities, and natural conditions. From these five factors, a total of 12 basic events were identified as the root causes of the delay in the KM. TAREX I repair project, derived from the fault tree construction and Minimal Cut Set calculation. 
ANALISIS KETERLAMBATAN JADWAL DOCKING PADA SALAH SATU KAPAL TUNDA MENGGUNAKAN METODE FAILURE MODE AND EFFECT ANALYSIS (STUDI KASUS PADA PRUSAHAAN PELAYARAN SURABAYA)
Full text linkThe docking process of tugboats is a critical activity in ship maintenance and repair that must be carried out in a timely manner to prevent disruption to operations. However, in practice, delays often occur and resulting in significant losses. This study aims to analyze the causes of docking delays on one of the tugboats owned by a shipping company in Surabaya using the Failure Mode and Effect Analysis (FMEA) methods. FMEA method is used to assess the level of risk by calculating the Risk Priority Number (RPN). The research findings show that 12 main factors with an RPN value above 200 significantly contribute to the docking delay, including budget constraints, changes in material specifications, lack of competent staff, lengthy PO (Purchase Order) verification processes, unresponsive vendors, unavailability of spare parts, delays in shipyard surveys, lack of technical knowledge of tugboats, inaccurate work planning, company pressure to fulfill contracts while maintaining ship condition, poor coordination or communication, and the ship still being deemed seaworthy for approximately three months. Proposed improvements to address these failure causes include the development of a Preventive Maintenance System, data digitalization, technical docking training, and other recommendations categorized based on cost, man, method, material, and equipment
ANALISIS EKONOMIS PEMBELIAN DAN PENYEWAAN KAPAL TONGKANG PADA PERUSAHAAN PELAYARAN DI SAMARINDA
Full text linkThis study aims to evaluate the economic feasibility of procuring a 300-ft barge through two schemes: purchase and lease, within the operational context of a shipping company in Samarinda. The analysis employs Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Benefit-Cost Ratio (BCR). Linear regression is used to determine the optimal barge dimensions based on payload capacity. Results show that the purchase scheme yields an NPV of Rp 35.38 billion and an IRR of 12.05%, with a PP of 1 year and 11 months. Meanwhile, the lease scheme yields an NPV of Rp 7.85 billion and an IRR of 24%, with positive cash flow from the first year. This study offers strategic recommendations for shipping companies to select procurement models aligned with investment priorities and financial conditions
STUDI NUMERIK PENGARUH VARIASI SUDUT DEFLEKTOR DI SAMPING ADVANCING BLADE TURBIN ANGIN SAVONIUS DENGAN PENGURANGAN PANJANG BUSUR 4 CM
No full textSavonius wind turbine is one type of Vertical Axis Wind Turbine (VAWT). Despite its advantages, it still has several limitations. Various studies had made to improve and optimize the performance of it but the performance result is not optimum. Based on that condition, this numerical study research was conducted to analyze the effect of deflector angle variations on the turbine advancing blade side, combined with 4 cm reduction in arc length. Numerical simulation was carried out using the Computational Fluid Dynamics (CFD) method with ANSYS 2020 R2 software, applying deflector angle variations of 0°, 15°, 30°, and 45° at wind speeds of 5, 6, and 7 m/s. The results indicate that the addition of a deflector can enhance Cp and Ct values, with the highest performance achieved at a 45° deflector angle and a wind speed of 6 m/s. This study contributes to the development of more efficient wind turbine designs and can serve as a reference for future research in the field of renewable energ
Strategi Pemeliharaan Berdasarkan Failure Mode Effect and Critically Analysis (FMECA) dan Reliability Centered Maintenance (RCM) Pada Cooling System Mesin Diesel Daihatsu DK28E MV. Meratus Kapuas
No full textThe water cooling system on ships plays a vital role in maintaining the stability of the main engine temperature, ensuring that the engine operates optimally. Failures in this system often result in reduced performance, progressive damage, and the risk of container delivery delays. Therefore, a method is required to reduce the risk of failures in water cooling system components, and the method applied in this study is Failure Mode, Effects, and Criticality Analysis (FMECA). This research focuses on developing a maintenance strategy for the cooling system of the Daihatsu DK28E diesel engine installed on MV. Meratus Kapuas. The study conducted through systematic data collection on operational history, failure records, and technical specifications, followed by the identification of failure modes, their effects, and criticality ranking to determine the most critical components. The risk analysis showed that several components such as fresh water standby pump, main sea water pump, lubricating oil cooler, intercooler, gate valve, swing type stop check valve, globe type stop check valve, butterfly valve were categorized as High risk, while components such as the fresh water cooler, filter sea chest, and fresh water temperature control valve were classified as Moderate, and expansion tank, globe valve, engine drive fresh water pump, and lubricating oil cooler gearbox as Low. Based on these findings, appropriate maintenance tasks such as on-condition task, scheduled restoration task, and discard task intervals were recommended.
Keyword: Water Cooling System, Main Engine, FMECA, RC
Analisis Pengaruh Penambahan Zat Aditif 2-EHN (2-Ethylhexyl Nitrate) Pada Performa Four-stroke Diesel Engine Menggunakan Bahan Bakar Multi-feedstock Biodiesel (Minyak Kelapa Sawit, Minyak Jelantah, Minyak Kedelai)
No full textThe decline petroleum reserves and increasing energy demand have encouraged the use of biodiesel as an environmentally friendly alternative fuel. However, biodiesel has limitations such as low cetane numbers and high viscosity, which affect engine performance. This study aims to analyze the effect of adding 2-Ethylhexyl Nitrate (2-EHN) additive on the performance of a Four-stroke Diesel Engine using Multi-feedstock biodiesel fuel composed of palm oil, waste cooking oil, and soybean oil. The method used was testing biodiesel blends B35, B40, and B100 with the addition of 2-EHN at different concentrations. Performance tests were conducted using a Jiangdong ZH1115N diesel engine with varying loads and speeds. The parameters analyzed included power, torque, Brake Mean Effective Pressure (BMEP), and Brake Specific Fuel Consumption (BSFC). The results showed that the B40 fuel with a 0.5% concentration of 2-EHN provided the best performance in terms of power, torque, and BMEP. Meanwhile, the lowest specific fuel consumption (BSFC) was achieved with a B35 blend containing 1% 2-EHN. These findings demonstrate that the use of 2-EHN additives can enhance the combustion characteristics and efficiency of multi-feedstock biodiesel, making it a more viable alternative fuel option
PENERAPAN METODE CRASHING PROJECT DALAM EFISIENSWI WAKTU DAN BIAYA DOCKING REPAIR KAPAL KARGO
Full text linkCargo ships need regular maintenance to stay in good working condition. During this process, planningthe schedule for docking and repairs is very important to make sure everything happens smoothly and ontime. If the plan doesn’t match what happens on the job site, it can cause big problems, like delaying theproject. This study aims to improve the time and cost of the ship docking repair process by using the CriticalPath Method (CPM) and Crashing Project techniques. The goal is to finish the project in the best possibletime and cost. The study found that under normal conditions, the project takes 30 days and costs Rp857,513,400. Adding 1 hour of overtime doesn’t help finish the project faster but increases the cost. Adding2 hours of overtime cuts the time to 28 days with a costsavings of 0.5%. Adding 3 hours of overtime shortensthe time to 27 days with a cost savings of 0.4%. The conclusion is that 2 hours of overtime is the best choicebecause it offers the best balance between time and cost savings
ANALISIS RISIKO KETERLAMBATAN BONGKAR MUAT DI PELABUHAN CURAH KERING MENGGUNAKAN METODE FMEA
Full text linkThe dry bulk terminal plays a vital role in maintaining the continuity of industrial supply chains. Delays in loading and unloading processes can lead to decreased operational efficiency, increased vessel waiting times, and significant financial losses. This study aims to identify and analyze the risks of loading and unloading delays at Port X, Gresik, using the Failure Mode and Effect Analysis (FMEA) method. Risk assessment was carried out through three main parameters: severity, occurrence, and detection capability for each sub-risk. The results indicate four priority sub-risks with the highest Risk Priority Number (RPN) values: congested truck circulation (216.75), grab equipment failure (194.88), weather effects (181.44), and insufficient fleet availability (157.76). These findings suggest that delays in dry bulk operations are predominantly influenced by external factors rather than internal ones. Therefore, risk management in ports should focus on strengthening external coordination with stakeholders, while also ensuring the reliability of internal equipment to maintain operational performance. The implications of this study highlight the importance of a structured, priority-based risk mitigation strategy to reduce logistics costs, improve service quality, and enhance port competitiveness in supporting the continuity of industrial supply chains
Analisis Kinerja Perpindahan Pan Penggunaan Shell and Tube sebagai Heat Exchanger pada Prototipe Ocean Thermal Energy Converison (OTEC)
No full text This study focuses on the design, fabrication, and testing of a shell and tube heat exchanger as a condenser in a laboratory-scale Ocean Thermal Energy Conversion (OTEC) system. The heat exchanger was designed with a 1-pass shell and 1-pass tube configuration, consisting of 26 copper tubes with an outer diameter of 9.5 mm and a length of 0.46 m, arranged within a steel shell of 155 mm diameter. The design process included determining thermal resistances, convective heat transfer coefficients, and the overall heat transfer coefficient (U). Theoretical calculations resulted in an overall heat transfer coefficient of 215.57 W/m²·K. After fabrication, the heat exchanger was integrated into the OTEC prototype, using R22 as the working fluid. Experimental testing indicated that the actual overall heat transfer coefficient reached 243 W/m²·K, showing a deviation of 12.7% compared to the theoretical design value. A significant enthalpy change was observed between state points H5 and H8, from 168.8 kJ/kg to 238.99 kJ/kg, confirming effective condensation and heat transfer within the system. These findings demonstrate that the shell and tube heat exchanger was successfully developed and performs reliably as a condenser in the OTEC prototype, supporting further utilization of ocean thermal energy as a renewable energy source
EVALUASI KELAYAKAN BISNIS OPERASIONAL KAPAL MILIK DAN SEWA BERBASIS VOYAGE CHARTER ATAU TIME CHARTER DALAM PENGANGKUTAN BATUBARA
No full textThe distribution of coal via maritime transport plays a crucial role in supporting Indonesia’s energy demands while offering potential investment opportunities for bulk carrier operations. This study evaluates the financial feasibility of four vessel operation alternatives: MV. Alpha (owned vessel) and MV. Beta (chartered vessel), each operating under Voyage Charter or Time Charter contracts. Internal Rate of Return (IRR) and Profitability Index (PI) are used as key indicators. All alternatives are financially feasible, with IRR values exceeding the required rate of return and PI values greater than 1. MV. Alpha–Voyage Charter records an IRR of 262.28% and PI of 9.27, while MV. Beta–Time Charter achieves IRR of 227.39% and PI of 8.04. Incremental PI analysis further identifies the most efficient investment combination. MV. Alpha–Voyage Charter yields an incremental PI of 1.61 over Time Charter, while MV. Beta–Time Charter yields 0.44 over Voyage Charter. Therefore, the optimal investment choice is to operate MV. Alpha under Voyage Charter and MV. Beta under Time Charter. To support profitability, companies should consider operational capital readiness and apply strategies such as OPEX efficiency, freight rate optimization, and diversification into alternative cargoes