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INDONESIA
Jurnal Teknik Mesin
Published by Politeknik Negeri Ketapang
ISSN : -     EISSN : 31235425     DOI : https://doi.org/10.58466/
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
JTM : JURNAL TEKN IK MESIN di https://jurnal.politap.ac.id/index.php/jtm merupakan jurnal blind peer-review yang didedikasikan untuk publikasi hasil penelitian berkualitas di bidang Teknik Mesin dan Inovasi Teknologi . Artikel yang dimuat di Jurnal Jurnal Teknik Mesin meliputi hasil penelitian ilmiah asli (prioritas utama), sedangkan untuk artikel review ilmiah yang baru (bukan prioritas utama) dan juga komentar yang bersifat kritis terhadap hasil karya ilmiah yang diterbitkan jurnal Jurnal Teknik Mesin. Semua publikasi di jurnal Jurnal Teknik Mesin bersifat akses terbuka yang memungkinkan artikel tersedia secara online secara bebas tanpa berlangganan apa pun
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 33 Documents
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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
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

Page 3 of 4 | Total Record : 33

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