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Fajar Pujiyanto
Politeknik Bumi Akpelni Semarang
Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Kinerja Pneumatic Quick Closing Valve untuk Meningkatkan Keamanan dan Keselamatan di MT. Sultan Mahmud Badaruddin II Pangestu Sri Nugroho; Eka Darmana; Fajar Pujiyanto
JURNAL BARTEK Vol 1 No 1 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/mw0dp249

Abstract

The quick closing valve cannot close quickly during training (drill) due to several technical factors. Conditions like this are very dangerous, especially when a fire occurs in the engine room which requires the use of a quick closing valve which must be able to close quickly. This research aims to analyze the decreasing performance of pneumatic quick closing valves on MT ships. Sultan Mahmud Badaruddin II. The research method used is descriptive qualitative with data collection techniques through direct observation on MT ships. Sultan Mahmud Baharuddin II, interviews, and documentation studies. Data analysis was carried out using two methods, namely the Fault Tree Analysis (FTA) method to identify the causes of decreased performance of the pneumatic quick closing valve, and the USG (Urgency, Seriousness, Growth) method to determine problem handling priorities. The research results showed that the decrease in the performance of the pneumatic quick closing valve was caused by a buildup of scale and paint coating on the valve parts, corrosion on the threaded shaft, and imperfect installation of the air pipe. The impact of this reduced performance includes delays in valve closure and the potential to worsen a fire if an emergency situation occurs. The handling efforts carried out are routine checks every week as well as maintenance and repairs according to the manual book.
Analisis Membran Filter Mikron Terhadap Produktivitas Reverse Osmosis Fresh Water Maker di MT. SC Warrior Luvis Figo; Ali Khamdilah; Eko Nur Hidayat; Fajar Pujiyanto
JURNAL BARTEK Vol 1 No 1 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/ckcy6t06

Abstract

MT. SC Warrior ship is a tanker designed to transport processed oil cargo on long-distance shipping routes. One of the main facilities to support ship shipping activities is the Reverse Osmosis (RO) Fresh Water Maker system. This equipment functions to produce fresh water with the main ingredient being sea water. The RO system utilizes a high pressure pump and a micron filter membrane as the main components in the process of converting seawater into fresh water. The problem with RO is a decrease in fresh water productivity, causing a fresh water deficit in the ship. The problem is caused by low hydrostatic pressure in the RO system, and the micron filter membrane's function is not optimal in filtering sea water. This condition disrupts ship operations where the availability of fresh water is insufficient in quantity. In order to avoid the same problems, proper preventive and corrective measures are needed.  Planned maintenance according to PMS and correct procedures must be carried out properly and correctly, which is important in maintaining the performance of the RO system. The need for consistent and proper maintenance, it is hoped that the RO system can continue to function effectively to support ship operations without obstacles.
Penurunan Tekanan Akibat Timbulnya Kerak Pada Pipa Inlet Pompa Sentrifugal di PDAM Rembang Ahmad Agus Yulianto; santhi wilastari; Fajar Pujiyanto
JURNAL BARTEK Vol 1 No 1 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/vf8fr150

Abstract

The centrifugal pump is one of the auxiliary machines at PDAM Rembang, functioning to fill water into the treatment tank/reservoir. There are distribution issues in PDAM Rembang due to interruptions in water distribution to customers, causing customer discomfort. The methods used include data collection, observation, interviews, and literature review. The interview method involved the author questioning the relevant mechanical personnel. Broadly, the author used a qualitative descriptive approach to compile this scientific paper. The results of this research show that the main causes of the pump issues are the lack of pressure in the centrifugal pump due to a blocked inlet valve by mud crusts and leaks in the pipe installation, suction pipe packing, and pump filter. The solution is to equip the pump with filters made of iron or steel coated with stainless steel or brass to prevent corrosion and to block debris and solid substances. A decrease in water flow rate is caused by an increase in pump temperature, blockages in the impeller from soft or solid debris, which leads to impeller imbalance and wear, resulting in the pump not operating optimally. The solution is to replace the damaged impeller and any leaking or corroded pipes. Additionally, there is the issue of wooden branches and metal plates from the river being sucked into the pump, causing impeller wear, resulting in pump instability and pressure drops below the standard 2.0 bar on the pump’s manometer. The solution is for technicians to conduct regular cleaning, inspections, and maintenance every three weeks, ensuring the filter is intact without holes or damage, so debris can be effectively filtered out.
Analisis Kerusakan Main Engine Reversing Type Angker bar Pada Kapal MT. Alice XXV Ahmat Zainuri; Eka Darmana; Fajar Pujiyanto
JURNAL BARTEK Vol 1 No 2 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/j8cte586

Abstract

During the author's observation on the MT. Alice XXV vessel, an issue occurred where the ship was unable to reverse. This incident was suspected to be caused by a jammed component in the pneumatic system. The objective of this study is to analyze the main cause of the vessel's inability to reverse, as well as the prevention and handling methods to maintain operational efficiency. This research is qualitative in nature. The instruments examined include the air starting system and the pneumatic control system. Data collection methods consist of direct observation in the engine room, interviews with the ship's crew, and technical data collection. A descriptive qualitative data analysis approach was used. Additionally, an analysis was conducted on the scale buildup in various pneumatic components and the factors affecting its formation rate. The results of the study indicate that MT. Alice XXV was unable to reverse due to a jammed pneumatic component, caused by scale buildup in the pneumatic system, which impeded the transmission of the command signal to the reversing system. The scale was caused by water particles entering the pneumatic system due to condensation of air inside the air bottle. High humidity in the air bottle led to condensation and the accumulation of water within it. To address this issue, preventive measures such as regular draining of the air bottle and cleaning of pneumatic filters are required.
Analisis Pecahnya Windlass Hydraulic Motor di Kapal MV. Lumoso Aman Fendy Aula Rizalul Ilmi; Eka Darmana; Fajar Pujiyanto
JURNAL BARTEK Vol 1 No 2 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/b0ab0e44

Abstract

During the author's observation on the MV. Lumoso Aman, a ship in Sulawesi waters, more precisely in Bahodopi in 2023, there was damage to the hydraulic motor windlass when raising anchor in the middle of the sea and the ship's maneuvering process was delayed. This study aims to analyze the main causes of the rupture of the windlass hydraulic motor, analyze the impact on hydraulic motor damage, and prevention and maintenance methods to maintain the efficiency of ship maneuvering and loading and unloading. The research method used is a qualitative case study by conducting direct research on the MV. Lumoso Aman. The method for data collection uses 3 techniques, namely by conducting observation, documentation, and interviews. This observation was carried out on the MV. Lumoso Aman. This documentation takes photos of activities related to the incident. Interviews were conducted after the incident by taking information from electrical and machinist II. The data analysis method uses a qualitative descriptive approach by concluding various opinions, data and literature. The results of the study showed that damage to the hydraulic motor hampered ship maneuvers and loading and unloading at the port. When the hydraulic system is clogged, hydraulic oil cannot flow into the system and affects the hydraulic motor and other components. Blocked oil pressure can cause excessive heat in the hydraulic motor and at worst can be damaged. To overcome this problem, preventive measures are needed such as regular maintenance, implementation of a monitoring system on the windlass components and cleaning the hydraulic filter.
Analisis Gangguan Kerja Potensiometer Pada Modul Kendali Steering Utama Type Rexpeller MV. Fanny Fajar Pujiyanto; Ali Khamdilah; Eka Darmana; Santhi Wilastari; Dwi Sulistyorini
JURNAL BARTEK Vol 1 No 2 (2025): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/6easm369

Abstract

Modern ship steering systems utilizing Rexpeller Thrusters rely heavily on the accuracy of position sensor readings, particularly potentiometers. This study analyzes signal disturbances in the potentiometer of the MV Fanny steering system, characterized by instability in resistance and output voltage. A qualitative descriptive research method was employed. Measurement results indicate voltage spikes at 50° and drops at 90°, as well as resistance anomalies at 70° and 110°. These disturbances cause the control system to receive erroneous thrust position data, triggering unnecessary automatic corrective commands, known as “self-moving steering.” Resistance–voltage versus angle plots reinforce the indication of localized damage on the potentiometer’s resistive track. System simulation shows that the error signals activate the ECU, causing continuous corrective actions. The implications of this research reveal that potentiometer instability poses a serious threat to ship operational safety by inducing uncommanded rudder movements and reducing control accuracy. This underscores the necessity of upgrading sensor technology from analog potentiometers to more reliable feedback devices and implementing periodic signal monitoring. Academically, the study contributes to the development of electrical engineering knowledge by establishing the relationship between sensor degradation and control instability. Inspection findings confirm that potentiometer faults significantly disrupt ship navigation, thus requiring recalibration, physical inspection, component replacement, and the implementation of redundant sensor systems to ensure steering reliability and safety.
Co-Authors Ahmad Agus Yulianto Ahmat Zainuri Ali Khamdilah Dwi Sulistyorini Eka Darmana Eko Nur Hidayat Fendy Aula Rizalul Ilmi Luvis Figo Pangestu Sri Nugroho Santhi Wilastari