Publication Search

The purpose of this study was to determine how the application of Local Microorganisms (LOM) from stale rice and oil palm boiler ash impacts the growth and production of shallots (Allium ascalonicum L.) and to determine the interaction between the two treatments. Shallots are a horticultural commodity with high economic value, so efforts are needed to increase production through the use of environmentally friendly organic materials. The study used a factorial Randomized Block Design (RBD) with two factors and three replications. The first factor was LOM from stale rice with four levels (0, 20, 40, and 60 ml/L water/plot) and the second factor was oil palm boiler ash with four levels (0, 500, 1000, and 1500 grams/plot), resulting in 16 treatment combinations and 48 experimental plots. The parameters observed included plant height, number of leaves, number of tillers, fresh weight of bulbs, dry weight of bulbs, and bulb diameter. If there was a significant effect, the data were tested using analysis of variance (ANOVA). This research is expected to produce scientific data on the use of organic waste as an environmentally friendly fertilizer alternative.

PT. Tirta Fresindo Jaya, specifically its Pasuruan plant as the producer of Pucuk Harum Tea beverage, requires a large supply of steam to support various production processes. This steam is used in the process of heating tea leaves, heating water through a heat exchanger, and heating chemicals and water in the cleaning in place (CIP) process. Steam pressure of 5 bar that is flowed to the process equipment will undergo condensation to produce condensate. To separate steam and condensate, steam traps are used, consisting of several types, namely mechanical, thermostatic, and thermodynamic. However, in operational practice, steam trap malfunctions often occur, either in the form of steam leaks that are wasted with condensate or failure to drain condensate from the system. This condition causes a decrease in the efficiency of the steam piping system and increases the workload of the boiler. As a result, fuel consumption and boiler feed water requirements become greater than ideal conditions. Therefore, this study aims to analyze the energy and operational losses caused by steam trap malfunctions, as well as evaluate their impact on boiler system performance and steam utilization efficiency at PT. Tirta Fresindo Jaya Pasuruan plant.      

This research aims to develop and evaluate the performance of a steam plant prototype designed as an alternative source of electrical energy to support the Vessel to Grid (V2G) concept. Utilization of backup energy on ships is becoming important as electricity demand increases and demands for a more sustainable electrical system. This system relies on ESP32 microcontroller technology as a control center that functions to monitor and control several key parameters, including steam pressure, combustion temperature, boiler water level, and the generated electrical voltage. The research method used is an experiment with a static and dynamic testing approach. Static testing is carried out to measure the performance of main components such as the boiler, turbine, and generator separately, while dynamic testing focuses on evaluating the overall system by involving the integration of sensors and supporting actuators. The test data is then analyzed quantitatively to determine the system's response to variations in steam pressure, temperature, and other operational conditions. The results show that the steam produced by the boiler is able to rotate the turbine, thereby driving the generator to produce electricity. The maximum voltage achieved is 25.7 volts at a steam pressure of 50 psi. The highest energy conversion efficiency was recorded at 4%, while the lowest efficiency was 0.9%. These findings demonstrate that, despite its relatively low efficiency, the prototype can function as an alternative energy source and emergency backup solution. Thus, this research provides an initial contribution to supporting the implementation of the V2G concept through the development of a small-scale steam plant-based energy conversion system.

The use of palm oil waste as boiler fuel is one of the innovative solutions in supporting the use of renewable energy while reducing the environmental impact of palm oil industry waste. Waste such as palm shells, mesocarp fibers, and empty oil palm bunches have high energy potential through direct combustion and other thermal technologies. This study aims to evaluate the potential use of palm oil waste as boiler fuel based on its calorific value, combustion efficiency, and environmental impact. The methods used include analysis of the physical and chemical characteristics of waste, boiler performance tests, and exhaust gas emission evaluation. The results show that palm oil waste has a high calorific value (15–20 MJ/kg), which makes it an efficient alternative fuel. In addition, the use of this waste is able to reduce dependence on fossil fuels while minimizing carbon emissions, thereby supporting the greenhouse gas emission reduction target. From an operational perspective, the use of palm oil waste in industrial boilers can increase combustion efficiency by up to 75–85%, depending on fuel conditions and boiler design. This makes palm oil waste not only economically valuable, but also strategic in supporting the transition to clean energy. Another advantage is that waste management becomes more targeted, because solid waste that is usually only an environmental burden can be reused as an energy source. However, some of the challenges that need to be considered include relatively high ash levels, the potential for corrosion in boiler equipment, and the need for emission control technology to comply with environmental standards. With the right mitigation strategy, palm oil waste can be processed into sustainable and environmentally friendly energy.

Micro, Small, and Medium Enterprises (MSMEs) play a strategic role in supporting Indonesia's economy, contributing 61.07% to the national Gross Domestic Product (GDP). However, MSMEs still face various challenges, particularly low productivity due to limited access to technology and production equipment. A clear example is Kedai Ndeso, located in Jiyu Village, Kutorejo District, Mojokerto Regency. This small food business faces inefficiencies in the noodle boiling process, which is still done manually using conventional methods, resulting in limited production capacity and longer service times. Through this community service program, the implementation team aimed to develop and apply an appropriate technology innovation in the form of a multi-strainer noodle boiler to help improve MSME productivity. The method used was a participatory approach, actively involving the Kedai Ndeso owner throughout each stage of the program, which was conducted from July 13 to 24, 2025. The developed noodle boiler measures 35x35x35 cm and is made of food-grade stainless steel. It features six separate strainers, allowing six portions of noodles to be cooked simultaneously in the same amount of time.nTesting results demonstrated that this tool significantly increased production efficiency without compromising the quality of the noodles. It also led to operational cost savings, especially in terms of energy use and labor time. Additionally, training and outreach activities were carried out to ensure effective knowledge transfer to the MSME owner. This appropriate technology innovation has proven to be a practical solution for MSMEs in the culinary sector, helping them increase productivity and competitiveness while maintaining consistent product quality and ensuring food safety. Therefore, this initiative provides a tangible contribution to supporting the sustainability and independence of small enterprises in rural areas, empowering them to compete more effectively in the modern economy.

Maintaining stable cage temperature is a crucial factor in the success of broiler chicken farming, especially in close house systems that rely on optimal microclimate control. Temperature instability can lead to thermal stress, reduced growth rates, and increased mortality in broilers, particularly during the early stages of life (0 to 30 days old). This study aims to design and implement an automatic temperature control system based on the Arduino Uno microcontroller integrated with a DHT11 temperature and humidity sensor in the broiler chicken cages of PT. Barokah Restu Utama. The system is designed to read temperature and humidity in real-time and automatically activate or deactivate cooling devices such as fans or heating devices like incandescent lamps, depending on the temperature range required for each growth phase. The ideal temperature range used as a reference in this system includes 30–32°C for chickens aged 0–7 days, 29°C for ages 8–14 days, 28°C for ages 15–21 days, and 26–27°C for chickens aged 22–30 days. Testing results show that the system is capable of maintaining stable temperatures according to the specified standards for each growth phase. With this automatic control system in place, broiler chicken maintenance becomes more efficient and effective. The risk of mortality due to heat stress is significantly reduced, and chicken growth becomes more optimal. This technology offers a practical and economical solution, especially for small- to medium-scale broiler chicken farmers who use close house systems. The system is easy to operate and relatively affordable to install, making it an accessible innovation that supports better livestock management through automation and smart farming practices.

Abstrak  - Coal handling system berfungsi menangani pekerjaan mulai dari pembongkaran batu bara dari kapal/tongkang (unloading area) yang dipindahkan ke conveyor - conveyor, penimbunan/penyimpanan di stock area, ataupun pengisian ke bunker yang digunakan untuk pembakaran di boiler. Dalam proses pembongkaran tersebut tidak boleh terjadi penyumbatan / plugging terutama pada chute conveyor, maka dari itu diperlukan sensor proteksi untuk mencegah hal tersebut. Sensor lama yang digunakan yaitu berjenis Tilt Switch yang selama pemakaian tidak efektif karena banyak masalah sehingga dilakukan pemeliharaan, akibatnya dilakukan penggantian menggunakan sensor berjenis MBD (Microwave Beam Detector). Dari analisa setelah penggantian menggunakan sensor MBD, permasalahan penyumbatan chute berkurang dapat dilihat dari frekuensi pemeliharaan yang semakin berkurang.

Research aims to design and develop a boiler system for heating Marine Fuel Oil (MFO) 180 CST by integrating Internet of Things (IoT) technology to enhance efficiency and operational monitoring. The methods used include boiler system design, selection of types and materials according to international standards, and the implementation of an optimal combustion system. IoT sensors are strategically placed to monitor key parameters such as temperature, pressure, and fluid flow in real-time. The collected data is transmitted to a cloud platform, enabling remote monitoring and automated performance analysis through a web or mobile-based application.. The research results indicate that IoT integration in the boiler system improves fuel heating efficiency, optimizes energy consumption, and facilitates easier monitoring and process control. Testing includes pressure tests, combustion efficiency, steam capacity, and material durability, with real-time monitoring to support performance analysis and early problem detection. Operational data evaluation allows for design adjustments or system settings to further enhance energy efficiency. With this innovation, the boiler system can operate more optimally, support energy efficiency, and facilitate predictive maintenance for sustainable industrial operations. The implementation of IoT in this system is expected to improve safety, effectiveness, and automation in boiler management, making it a more reliable and modern solution.

PT. Dian Swastatika Sentosa generates electricity through a private thermal power plant. This company produces steam and electricity for paper mills. The company hopes to meet its steam and electricity needs in 2023 with a boiler with a load capacity of 180 tons and a maximum capacity of 220 tons. However, from February to July 2023, that goal was not achieved. The most common problems faced by this company are the failure to conduct preventive inspections and timely machine maintenance, as well as the failure to carry out necessary repairs. Delays in machine repairs, which result in inconsistent machine downtime schedules to meet customer demand, leading to damage to boiler equipment, causing abnormal boiler operation and reduced steam production. This research aims to design equipment to withstand operational impacts using failure mode and effects analysis (FMEA) with the Soft Systems Methodology (SSM) and reliability-centered maintenance (RCM) techniques. The RCM method assists in identifying the processes that must be followed to guarantee that a machine or system performs as intended. RCM can also be used to design, choose, and create alternative maintenance methods that are focused on safety, operations, standards, and economics. For the entire problem in the investigation, a dynamic model is necessary. An analytical system is used in this model in order to recognize and duplicate the features of the overall system., as well as to provide repair solutions and address the burden of the problem. This research produces a presentation in the form of problem identification, causal loops, diagrams of machines that frequently experience failures, rich images of the causes and effects of the ball plate crusher liner damage, root cause definitions, and conceptual models for repair and maintenance. business productivity and debating process. 

This research was motivated by several laundries that use pressure cooker steam iron boilers for the ironing process. However, there are still users who find it difficult to estimate water level. If the water in the pressure cooker dries up or runs out whitout knowing it, then this can be dangerous and have a bad impact both on the user and in terms of the quality of the pot. So the aim of this research is to modify the pressure cooker steam iron boiler by adding a water level indicator whose function is to determine the water capacity during the ironing process, so that it is hoped that it can minimize work accidents. The method use is descriptive quantitative. From the design process, the tool was then tested to determine the starting time for using the iron using pressure variations of 15 psi, 20 psi, and 22 psi. From the research results, it was found that the design process was carried out through several stages, including the measurement process, drilling process, and assembly process. The test results started that the optimal pressure was 20 psi, because at this pressure the steam produced was optimal with a heating time of a 58 minutes.

This qualitative study aims to examine the implementation of risk management in hull insurance by collecting data through interviews with the risk management staff of Asuransi Mitra Pelindung Mustika Ltd. The findings revealed that this company has applied the risk management process, including risk identification, risk analysis, risk evaluation, risk control, risk transfer through other insurance policies, monitoring, and review. The company covers losses due to fire, explosion, violent theft, piracy, accidents involving installations, collisions with aircraft or similar objects, earthquakes, volcanic eruptions, lightning strikes, accidents during loading or refuelling, boiler explosions, machinery shaft breakage, or latent defects in the machinery, hull, or frame of the insured vessel. Asuransi Mitra Pelindung Mustika Ltd. also compensates for losses due to the negligence of the captain, officers, or crew of the insured vessel, as well as the shipyard. Time to process the claim becomes a significant challenge in fulfilling the insured's rights in the claim for the BG. TRG 06 vessel because it takes up to 14 days to gather all the necessary documents. This company will cover all repair costs and labor expenses, with an estimated total value of IDR 7,611,100,000.00.

From this study, the automatic electric oil heater can be used to adjust the temperature value and the automatic electric heater will be able to turn off automatically according to the setpoint temperature value determined through a smartphone device or IoT program. Monitoring can also be done with the app, as well as being able to view temperature values directly through the LCD. This tool is in the form of an electric heater that will be used to heat ship fuel automatically and is more practical and efficient. It is also easier to maintain than a boiler on a ship. The design of this tool is based on accurate calculation of temperature values, with which the process of heating up fuel becomes faster. From the results of this study, a heat sensor that can read the temperature value and the buzzer will sound and the device will automatically turn off if the temperature has reached a specified setpoint. This research was carried out when the ship was about to make a departure to find out the temperature in the heating of the fuel on the ship. Testing Design of an automatic electric oil heater as a replacement for IoT-based thermal oil boiler on this bulk carrier ship, it can be known the disadvantages and advantages of this tool, testing can be done by putting oil into the electric heater, then in a short time the oil will heat up quickly, and the tool will be able to turn off automatically and the buzzer will immediately turn on when the heat has reached the specified temperature. In the temperature setting, it can be set in a smartphone or an app that can adjust the temperature and turn off the appliance from a considerable distance. However, the application must use the internet network and cannot be accessed locally, the use of IoT requires devices and smartphones to be connected to the internet.    

HIRARC is a document that contains hazard identification, risk assessment and risk control in order to reduce the occurrence of occupational safety and health disturbances. The type of research used is qualitative with a descriptive approach. The research aims to explain the value of the risks contained in each work area by describing the work safety analysis process by determining the level of likelihood and severity of each risk. Based on interviews and observations conducted by researchers in the Boiler section of PLTU Nii Tanasa Kendari, there are several potential dangers ranging from physical, mechanical, chemical, electrical, to ergonomic dangers. The results of the analysis of potential hazards show a low risk of 9 types of danger, a moderate risk of 7 types of danger, a high risk of 8 types of danger.The controls used are technical engineering such as providing fire extinguishers and first aid kits, installing handrails and guardrails to anticipate falls from heights, and providing insulation and dampening for equipment that is at high risk of causing work accidents. Administrative controls such as providing work instructions and SOPs, cleaning work environment areas and using PPE.

Anugerah Dwi Pratama is a company engaged in the supply of goods and services for boiler machines or steam-powered power plants that was founded in 2010 until now. In connection with the growing national and international competition which resulted in a significant decrease in PT. Anugerah Dwi Pratama, it is necessary to carry out an assessment of the determining variables such as quality, product prices on sustainable buying interest, so that the company can continue to maintain and improve its existence. This research helps companies formulate problems to develop company development strategies.

Sebuah ketel uap  harus cukup  kuat  supaya  dapat  bekerja  dengan  aman pada tekanan tertentu, sehingga perlu dilengkapi pesawat-pesawat keamanan. Masinis di atas kapal mempunyai tuntutan agar secara rutin melakukan perawatan pada ketel uap bantu dengan berpegangan pada manual book yang sudah dibuat maker. Berdasarkan pengalaman saat berlayar di salah satu kapal ditemukan suatu kejadian bahwa auxiliary boiler beroperasi serta mengeluarkan uap bertekanan yang berguna untuk kecukupan kebutuhan uap di atas kapal. Bunyi pada alarm yang setelah diperiksa pada panel auxiliary boiler, ternyata alarm muncul pada flame failure dan lowest water level, sedangkan feed pump beroperasi normal serta masih dalam keadaan mengisi air ke dalam auxiliary boiler. Penelitian ini dilakukan untuk mengetahui faktor yang dapat mengakibatkan air masuk ke dalam furnace, mengetahui dampak yang dapat terjadi jika air  masuk ke dalam furnace serta mengetahui langkah yang dapat diambil untuk mengatasi masuknya air ke dalam Furnace. Metode penelitian ini menggunakan metode kualitatif. Sumber data diperoleh dari data primer maupun data sekunder. Teknik pengumpulan data yang  digunakan  adalah  wawancara,  observasi,  maupun  dokumentasi.  Teknik  analisis  data  yang digunakan adalah fishbone diagram dan USG. Hasil penelitian menunjukkan bahwa masuknya air ke dalam auxiliary boiler  disebabkan oleh retaknya dinding  furnace. Dampak  yang  ditimbulkan  yaitu terganggunya proses pembakaran di dalam furnace serta kerusakan pada komponen-komponen burner. Upaya yang dapat dilakukan adalah dengan mengelas bagian dinding furnace yang retak agar air tidak masuk ke dalam furnace.

Kebutuhan akan konsumsi energi listrik sangat tinggi dan semua aktivitas manusia banyak yang menggunakan energi listrik. Listrik juga sangat dibutuhkan pada industri, karna seluruh alat hampir semua menggunakan listrik. Karna penggunaan listrik sangat besar pada PT. Cemindo Gemilang membangun unit WHRS (Waste Heats Recovery System) untuk menyuplai listrik. Dalam penelitian ini bertujuan untuk mengetahui bagaimana prinsip kerja serta proses kerja pada WHRS. Metode yang digunakan yaitu dengan observasi dan wawancara untuk mengetahui bagaimana proses pada WHRS tersebut. Hasil kesimpulan yaitu Waste Heats Recovery System ini merupakan pembangkit listrik yang menggunakan sisa panas atau flue gas sebagai pengganti batu bara untuk memanaskan air pada boiler.