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Trassanda Scudetto Widestomo Putra
Institut Teknologi Perusahaan Listrik Negara (ITPLN)
Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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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
Evaluasi Overhaul terhadap Efisiensi Boiler Unit 1 PLTU Banjarsari Eri Prabowo; Trassanda Scudetto Widestomo Putra; Alif Adiyanto
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: 10.58466/3vjtps23

Abstract

The boiler is a major component in a steam power plant because it converts feedwater into high-pressure and high-temperature steam for turbine operation. Boiler efficiency decreases when heat-transfer surfaces are dirty, combustion support equipment is not optimal, or operating instruments are inaccurate. This article evaluates the effect of overhaul on Boiler Unit 1 at PLTU Banjarsari using performance-test data at 125 MW. Two calculation approaches are used: the direct method and the indirect or heat-loss method. The direct-method efficiency increased from 67.65% before overhaul to 70.05% after overhaul, indicating a 2.40 percentage-point improvement. The indirect-method efficiency increased from 83.55% to 87.21%, indicating a 3.66 percentage-point improvement. The most relevant technical improvements were cleaning of boiler tubes, repair of a leaking superheater drain pipe, and calibration of the feedwater flow meter. The dry flue-gas loss decreased from 5.034% to 2.765%, while specific coal consumption decreased from 0.611 kg/kWh to 0.590 kg/kWh. These results show that overhaul improves heat utilization and supports more economical boiler operation.
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: 10.58466/5mc5pe71

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.  
Evaluasi Overhaul terhadap Efisiensi Boiler Unit 3 PLTU Lontar Eri Prabowo; Trassanda Scudetto Widestomo Putra; Ajibrila Nabawi
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/vrfmq234

Abstract

The boiler is the main component of a steam power plant because it converts feedwater into high-temperature and high-pressure steam for turbine operation. Boiler efficiency is affected by combustion quality, coal characteristics, air supply, heat-transfer cleanliness, and the condition of auxiliary equipment. This study evaluates the effect of overhaul on the efficiency of Boiler Unit 3 at UJP PLTU Banten 3 Lontar. The calculation uses performance-test data before and after overhaul at a 294 MW load. Two methods are applied: the direct or input-output method and the indirect or heat-loss method based on ASME PTC 4. The direct-method efficiency increased from 79.51% before overhaul to 79.68% after overhaul, equivalent to a 0.17 percentage-point improvement. The indirect-method efficiency increased from 81.85% to 82.61%, equivalent to a 0.76 percentage-point improvement. The reduction in dry flue-gas loss, hydrogen-moisture loss, coal-moisture loss, and air-moisture loss indicates that overhaul improves boiler heat utilization, especially through tube cleaning, air-preheater cleaning, and restoration of combustion-supporting equipment. The results confirm that scheduled overhaul can improve boiler performance and should be maintained as part of plant reliability management
Evaluasi Korosi Disk Gate Valve Drain TCA PLTGU Priok Eri Prabowo; Trassanda Scudetto Widestomo Putra; Ari Fajar Nahor
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/sptr5768

Abstract

The drain TCA gate valve disk in Unit 3 of PLTGU Priok experienced material degradation dominated by corrosion. This study evaluates the influence of working-fluid temperature and pressure on disk damage using visual observation, metallographic testing, SEM-EDX characterization, Vickers hardness testing, operating-parameter calculation, and fishbone analysis. The investigated disk material was stainless steel SUS316. Metallographic observations showed ferrite and pearlite phases, local voids, and indications of decarburization near the grain boundary. SEM-EDX analysis identified C, N, O, and Fe with weight fractions of 6.87%, 0.50%, 0.72%, and 91.90%, respectively. The average hardness of the used disk was 192 HV, equivalent to about 190 HB and 92 HRB, while comparison with new disk data indicated a significant hardness reduction. Operating analysis showed that pressure increased from 16.57 bar to 18.23 bar and temperature increased from 464.8 deg C to 485 deg C when damage risk became critical. These results indicate that high pressure and temperature accelerate corrosion reactions, reduce material resistance, and shorten valve service life. Strict monitoring of pressure, temperature, cooling effectiveness, and material condition is therefore required
Analisis Desain PLTB Horizontal 0,3 kW Berbasis QBlade di Tangerang Eri Prabowo; Trassanda Scudetto Widestomo Putra; Tom Rizkon Uzarni Paradongan
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/rk1hyc07

Abstract

  The low utilization of small-scale wind energy in urban residential areas requires a technical design approach that considers local wind speed, blade geometry, rotor configuration, and generator suitability. This paper analyzes a 0.3 kW horizontal-axis wind power design for the Grand Duta residential area, Tangerang, using the QBlade simulation approach. The design uses a three-blade horizontal rotor with a 2 m rotor radius, NACA 4412 airfoil, and taperless blade concept. Wind data were obtained from BMKG and direct anemometer measurements, then simplified into design parameters. The local average wind speed used in the design was approximately 4 m/s, with cut-in, rated, and cut-out references of 2.8 m/s, 8.0 m/s, and 12.0 m/s, respectively. The selected blade design used NACA 4412 with an optimum angle of attack of 6 degrees, Cl/Cd of 133.5, and Cl of 1.12. The QBlade simulation at 0 degree pitch showed that the rotor produced 252.676 W at 4 m/s and 300 rpm, while the maximum simulated power reached 2324 W at 20 m/s. At 6 degree pitch, the maximum simulated power reached 2837 W. The results indicate that the design is technically feasible as a small horizontal-axis wind turbine concept, although further prototype testing is required to validate structural strength, generator matching, and field performance.
Evaluasi Efisiensi Boiler Pulverized Coal pada Co-Firing Sawdust PLTU Pacitan Eri Prabowo; Trassanda Scudetto Widestomo Putra; Muhammad Sayid Romdhoni
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/njh5st52

Abstract

This study evaluates boiler efficiency in a pulverized-coal steam power plant during direct co-firing of sawdust biomass at PLTU Pacitan Unit 1. The analysis uses operational and performance-test data for coal firing and co-firing schemes with 1%, 2%, and 5% sawdust at approximately 295 MW load. Boiler efficiency was calculated using the indirect heat-loss method based on ASME PTC 4, supported by fuel ultimate and proximate analysis, heat-loss components, fuel rate, air-heater gas temperature, and emission measurements. The results show that increasing sawdust composition changes fuel characteristics, especially lower gross calorific value, lower sulfur and ash content, higher total moisture, and lower Hardgrove Grindability Index. Boiler efficiency on an LHV basis reached 91.96% for 100% coal, 92.61% for 1% sawdust, 92.30% for 2% sawdust, and 91.74% for 5% sawdust. At 5% co-firing, fuel consumption increased by about 1.19% compared with coal firing, while SO2, NOx, and particulate emissions decreased and remained below the regulatory limits. The study indicates that sawdust co-firing can support emission reduction, but boiler efficiency and fuel handling require continuous monitoring
Evaluasi Operasi PLTD Kamanggih Pasca-Interkoneksi pada Sistem Waingapu Eri Prabowo; Trassanda Scudetto Widestomo Putra; Abdal Ghofar
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: 10.58466/21ca3t15

Abstract

This study evaluates the operational effect of connecting PLTD Kamanggih to the Waingapu system through a 20 kV interconnection network. The study used operational, production, fuel, lubricant, cost, and system-capacity data from January 2023 to June 2024. The main indicators were Specific Fuel Consumption (SFC), Specific Lubricant Consumption (SLC), and Cost of Electricity Production (BPP). Before interconnection, PLTD Kamanggih had higher SFC, SLC, and BPP than PLTD Waingapu, namely 0.41661 liter/kWh, 0.00401 liter/kWh, and 5,785.48 Rp/kWh, while PLTD Waingapu recorded 0.27945 liter/kWh, 0.00012 liter/kWh, and 3,160.71 Rp/kWh. After the interconnection, Kamanggih's 0.114 MW load was supplied by the Waingapu system, which still had sufficient available capacity. The best comparison occurred between the second quarter of 2023 and the second quarter of 2024, where SFC decreased by 0.00729 liter/kWh or 2.59%, SLC decreased by 0.00012 liter/kWh or 73.94%, and BPP decreased by 87.57 Rp/kWh or 2.63%. The result indicates that 20 kV interconnection is effective as a dedieselization strategy to improve operational efficiency, reduce isolated diesel operation, and lower electricity production cost.
Co-Authors Abdal Ghofar Afristian Arief Dwiranda Ajibrila Nabawi Alamsyah Robby Maulana Alif Adiyanto Arash Ari Fajar Nahor Eri Prabowo Eri Prabowoa Fikry Ramadani Indra Kusumah Disastra Maria Anjelina Peni Michael Putra Humisar Tampubolon Muhammad Sayid Romdhoni Rahardianto Ramadhan Tegar Aris Prayoga Theresia Margaretha Napitupulu Tom Rizkon Uzarni Paradongan Wahyu Haristiyanto Wenny Retno Astagina