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Eri Prabowo
Institut Teknologi Perusahaan Listrik Negara (ITPLN)
Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Overhaul Terhadap Kinerja High Pressure Heater Unit 3 PLTU Banten Lontar Trassanda Scudetto Widestomo Putra; Eri Prabowo; Fikry Ramadani
JTM : JURNAL TEKNIK MESIN Vol 2 No 1 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/drv17368

Abstract

This study analyzes the effect of overhaul on the performance of High Pressure Heater (HPH) 1,2, and 3 in unit 3 of PLTU Banten 3 Lontar  at a constant load of 294 MW. The analysis used actual operational data before overhaul (July 2018) and after overhaul (December 2018). Heater Performance was evaluated using terminal temperature difference (TTD), drain cooler approach (DCA), temperature rise (TR), logarithmic mean temperature difference (LMTD), Capacity heat ratio (C), and thermal effectiveness. The result show that overhaul generally improved HPH performance. The strongest improvement occured HPH 1, where DCA decreased from 26.68 celcius to 4.38 celcius, LMTD decreased from 42.81 celcius to 20.62 celcius, and effectiveness increased from 0.72 to 0.95. HPH 2 showed the only TTD improvement from 0.79 celcius to 0.66 celcius, while HPH 1 and HPH 3 experienced slightly higher TTD after overhaul. Even so, the consistent decline in effectiveness for all heaters indicate that tube cleaning, leakage testing, tube plugging, and gasket replacement restored heat transfer performance.  Therefore, overhaul is an effective maintenance action to improve HPH thermal performance with the most significant impact observed in HPH 1 
Evaluasi Kinerja BFPT Unit 6 PLTU Suralaya Pasca-Overhaul Eri Prabowo; Trassanda Scudetto Widestomo Putra; Alamsyah Robby Maulana
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/1zt8wd31

Abstract

Boiler Feed Pump Turbine (BFPT) is a critical auxiliary component in steam power plants because it supplies feedwater from the deaerator to the boiler steam drum through the heater system. Continuous operation may reduce pump performance due to leakage, wear, seal damage, abnormal noise, and internal component deterioration. This study evaluates the performance of BFPT Unit 6 at PLTU Suralaya before and after overhaul using performance test data from December 2019 and February 2020. The evaluated parameters include flow rate, suction and discharge velocity, total head, hydraulic power, and pump efficiency. The calculation uses the continuity equation, Reynolds number, head losses, total head, hydraulic power, and pump efficiency. The results show that overhaul increased the efficiency of both BFPT units. BFPT A efficiency increased from 68.98% and 70.00% before overhaul to 72.01% and 73.50% after overhaul. BFPT B efficiency increased from 69.31% and 71.10% to 72.05% and 74.20%. The increase was associated with lower total head and restored mechanical condition after mechanical seal replacement and inner-part repair. Therefore, overhaul improved BFPT performance and should be supported by routine monitoring of leakage, vibration, lubrication, and operating flow.  
Analisis Co-Firing Kulit Kayu terhadap Emisi dan SFC PLTU Balikpapan Eri Prabowo; Trassanda Scudetto Widestomo Putra; Wenny Retno Astagina
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/pgfhcn81

Abstract

Co-firing is a practical approach to reduce coal dependency and improve environmental performance in existing coal-fired power plants. This paper evaluates 3% wood bark co-firing at Unit 2 of PLTU Teluk Balikpapan 2 x 110 MW, focusing on emissions, specific fuel consumption (SFC), and key operating parameters. The study compares baseline operation using 100% coal with operation using 97% coal and 3% wood bark. Fuel characteristics, boiler operating data, bottom ash observation, stack visual inspection, SFC calculation, and flue gas emission measurements are evaluated. Wood bark has lower sulfur content than coal, namely 0.13% compared with 0.59%, although its gross calorific value is lower. The co-firing test decreased SO2 emission from 246.7 mg/Nm3 to 190 mg/Nm3, equivalent to a reduction of 22.98%, while NOx increased from 285 mg/Nm3 to 307 mg/Nm3 but remained below the 550 mg/Nm3 emission limit. SFC changed slightly from 0.706 kg/kWh to 0.707 kg/kWh. Bed temperature decreased from 927.16 degC to 924.18 degC and FEGT decreased from 1013.78 degC to 1011.24 degC, indicating stable boiler operation. The test did not show black smoke, carry over, or significant agglomeration tendency. Therefore, 3% wood bark co-firing is technically feasible for emission reduction with limited impact on SFC.
Analisis Desain Turbin Angin Horizontal 100 W di Pantai Koneng Eri Prabowo; Trassanda Scudetto Widestomo Putra; Michael Putra Humisar Tampubolon
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/86etnm35

Abstract

turbine at Pantai Koneng, Dumai, using NACA airfoils and QBlade simulation. The design compares three-blade and five-blade rotor configurations based on measured wind data, blade geometry, coefficient of power, tip speed ratio, rotational speed, and simulated power output. Primary wind data were obtained using a digital anemometer on 15-16 July 2023, while secondary data were taken from BMKG Pekanbaru and windPROSPECTING. The measured average wind speed at Pantai Koneng was 4.00 m/s, with a maximum hourly average of 6.00 m/s and a minimum of 3.00 m/s. The blade radius was set at 2 m with a taperless chord of 0.145 m and twelve blade segments using NACA 4424, NACA 4418, and NACA 4412 airfoils. QBlade results show that the three-blade configuration produces 230.793 W, coefficient of power 0.468, TSR 7, and rotational speed 200 rpm. The five-blade configuration produces 188.354 W, coefficient of power 0.382, TSR 5, and rotational speed 150 rpm. The three-blade rotor is therefore recommended because it provides higher simulated output and better suitability for the intended 100 W design target
Kelayakan Finansial PLTS Atap On-Grid pada Gedung Komersial Eri Prabowo; Trassanda Scudetto Widestomo Putra; Theresia Margaretha Napitupulu
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/m8gpe298

Abstract

This study evaluates the financial feasibility of an on-grid rooftop solar power plant implemented on a commercial building in West Java. The system is designed with a 50 kW inverter and 69 monocrystalline photovoltaic modules with a total array capacity of 34.5 kWp. The study applies a quantitative applied approach using load profile data, solar radiation data, investment cost, operation and maintenance cost, and electricity tariff as the main inputs. Financial feasibility is assessed using Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period, while the technical contribution is evaluated through annual energy production and bill-saving potential. The rooftop PV system produces approximately 40,296 kWh per year and reduces monthly electricity consumption by about 3,358 kWh. This output provides a monthly saving of IDR 4,851,303 and an annual economic value of IDR 58,215,631 in the first year. With an initial investment of IDR 483,000,000 and inverter replacement considered in year 11, the project generates a positive NPV of IDR 111,294,381, IRR of 13.56%, and payback period of 9.07 years. These indicators show that the project is financially feasible and supports long-term operational cost efficiency, provided that system performance and maintenance are properly managed
Evaluasi Nilai Kalor Batubara terhadap Efisiensi Boiler PLTU Suralaya Eri Prabowo; Trassanda Scudetto Widestomo Putra; Wahyu Haristiyanto
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/a1rmw552

Abstract

Coal calorific value affects the heat input, combustion quality, heat losses, and fuel consumption of steam power plant boilers. This paper evaluates the effect of coal calorific value on boiler efficiency at Units 1, 3, and 4 of PLTU Suralaya. The study uses performance test data at a comparable load of 400 MW with coal calorific values of 4238, 4472, 4656, and 5051 kcal/kg. Boiler efficiency is calculated using the direct method and the indirect heat loss method based on ASME PTC 4.1. The indirect method shows that boiler efficiency increases from 83.269% at 4238 kcal/kg to 86.625% at 5051 kcal/kg. Total heat loss decreases from 16.731% to 13.375%, while specific fuel consumption decreases from 0.613 to 0.553 kg/kWh. The results indicate that higher coal calorific value improves boiler efficiency and reduces coal consumption, mainly because lower moisture and higher fixed carbon reduce heat losses in flue gas and moisture evaporation
Evaluasi Tubes Plugging terhadap Kinerja Kondensor PLTU Adipala Eri Prabowo; Trassanda Scudetto Widestomo Putra; Arash
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/mxrx6568

Abstract

This study evaluates the effect of tubes plugging on the condenser performance of Unit 1 at PLTU Adipala 1x660 MW. The analysis used operating data before plugging on 26 October 2017, 26 October 2018, and 29 November 2018, and after plugging on 29 October 2017, 2 November 2018, and 9 February 2019. Condenser performance was assessed using logarithmic mean temperature difference (LMTD), temperature rise (TR), heat-transfer area, heat load, and overall heat-transfer coefficient (U). The results show that after the third plugging condition, LMTD decreased to 7.413 °C in condenser A and 8.145 °C in condenser B, while TR decreased to 9.855 °C and 8.716 °C, respectively. Although U increased to 29.893 kW/m².°C in condenser A and 23.732 kW/m².°C in condenser B, the increase was associated with higher cooling-water flow demand and reduced active heat-transfer area. The findings indicate that tubes plugging is effective as short-term leakage mitigation, but increasing plug quantity reduces condenser heat-transfer capacity and requires monitoring of cooling-water flow, fouling, and condenser vacuum.
Evaluasi Efisiensi Turbin Gas PLTGU Muara Tawar Pasca-Overhaul Eri Prabowo; Trassanda Scudetto Widestomo Putra; Rahardianto Ramadhan
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/23bj7m09

Abstract

Gas turbine performance in a combined-cycle power plant is strongly affected by compressor condition, combustion stability, turbine expansion efficiency, and fuel consumption. This study evaluates the effect of minor-inspection overhaul on the gas turbine efficiency of Block 4 Unit 1 at PLTGU Muara Tawar using performance-test data at 137 MW before and after overhaul. The method applies Brayton-cycle calculations by processing inlet and outlet temperature, pressure ratio, air and fuel mass flow, compressor work, turbine work, heat input, back work ratio, heat rate, and component efficiency. The results show that overhaul improved the main performance indicators. Thermal efficiency increased from 32.85% to 32.93%, compressor efficiency from 90.96% to 91.58%, combustion chamber efficiency from 96.94% to 97.08%, and turbine efficiency from 90.42% to 90.48%. Heat rate decreased from 10,957.89 kJ/kWh to 10,930.15 kJ/kWh. The improvement was associated with air-intake filter restoration, compressor inlet guide vane cleaning and recoating, combustion chamber repair, burner maintenance, and turbine blade replacement. Therefore, minor inspection contributed to restoring gas turbine performance, although periodic monitoring of heat rate, compressor fouling, exhaust temperature, and fuel-air ratio is still required
Evaluasi Rasio Coal Blending terhadap Efisiensi Boiler Unit 7 Suralaya Eri Prabowo; Trassanda Scudetto Widestomo Putra; Tegar Aris Prayoga
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/8t6mxj35

Abstract

This study evaluates the effect of coal blending ratio on boiler efficiency at Unit 7 of PT Indonesia Power Suralaya PGU. The analysis used low-rank coal (LRC) and medium-rank coal (MRC) with three blending ratios, namely 25L:75M, 50L:50M, and 75L:25M. Boiler performance was calculated using the indirect heat-loss method and compared with the direct input-output method. The main evaluated variables were coal quality, calorific value, moisture, ash, ultimate analysis, dry flue-gas loss, hydrogen-moisture loss, fuel-moisture loss, air-moisture loss, and specific fuel consumption. The results show that increasing the MRC fraction improves calorific value and tends to reduce moisture-related losses. The 25L:75M ratio consistently produced the best mixed-coal performance. In February 2020, the BB-2 mixture with 25L:75M achieved the highest indirect boiler efficiency of 85.798%, while the direct-method efficiency reached 73.845%. Therefore, the 25L:75M blending ratio is recommended as the most suitable operating option among the evaluated mixtures
Kelayakan Finansial PLTP Atadei Berbasis Risiko Investasi Eri Prabowo; Trassanda Scudetto Widestomo Putra; Maria Anjelina Peni
JTM : JURNAL TEKNIK MESIN Vol 2 No 2 (2026)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/vs168j10

Abstract

This study evaluates the financial feasibility and risk profile of the planned Atadei Geothermal Power Plant in Lembata, East Nusa Tenggara, with an installed capacity of 2 x 5 MW. The analysis applies a quantitative pre-feasibility approach using Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PBP), Benefit Cost Ratio (BCR), and Profitability Index (PI). Two operating assumptions are compared: a constant case with a 90% capacity factor and constant OPEX, and a realistic case with capacity factor declining from 90% to 75% and OPEX escalating by 2.3% per year. The constant assumption shows that the project is feasible in the moderate scenario with NPV of USD 1,942,068 and in the optimistic scenario with NPV of USD 11,369,779, while the pessimistic scenario remains infeasible. Under realistic assumptions, feasibility decreases sharply; only the optimistic scenario remains marginally feasible with NPV of USD 81,098, BCR of 1.00, PI of 1.00, and a payback period of 30.45 years. These findings indicate that discount rate, OPEX escalation, and reservoir-related production decline are the dominant risks. The project can support regional energy security, but it requires low-cost financing, stable reservoir performance, and strict operational cost control
Co-Authors Abdal Ghofar Ajibrila Nabawi Alamsyah Robby Maulana Alif Adiyanto Arash Ari Fajar Nahor Fikry Ramadani Maria Anjelina Peni Michael Putra Humisar Tampubolon Muhammad Sayid Romdhoni Rahardianto Ramadhan Tegar Aris Prayoga Theresia Margaretha Napitupulu Tom Rizkon Uzarni Paradongan Trassanda Scudetto Widestomo Putra Wahyu Haristiyanto Wenny Retno Astagina