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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 18 Documents
 1   2 
Search results for , issue "vol 2 no 2 (2026)" : 18 Documents clear
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
Evaluasi Overhaul terhadap Konsumsi HSD PLTDG Pesanggaran Eri Prabowoa; Trassanda Scudetto Widestomo Putra; Indra Kusumah Disastra
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/pansbs77

Abstract

High Speed Diesel (HSD) consumption is a critical operating variable for diesel-gas power plants because it directly affects fuel cost, engine performance, and generating-unit reliability. This article evaluates HSD fuel consumption of the Wartsila 18V50DF engine at PLTDG 200 MW Pesanggaran, Bali, before and after overhaul. The study uses quantitative analysis of performance-test data from Unit 02 and Unit 05 at several operating-hour intervals. Calculations include effective power, indicated power, charge efficiency, combustion-air requirement, air-fuel ratio, hourly fuel consumption, and brake specific fuel consumption. The results show that overhaul reduced HSD consumption in all observed comparisons. Unit 02 decreased from 4888.91 to 2653.98 L/h at 18000 h, from 6425.42 to 4330.17 L/h at 36000 h, and from 5168.27 to 5098.43 L/h at 48000 h. Unit 05 decreased from 4330.19 to 4260.32 L/h at 36000 h and from 5517.48 to 5168.27 L/h at 48000 h. The improvement is associated with restoration of combustion components, cleaner air supply, and reduced combustion deposits after overhaul.
Evaluasi Major Overhaul terhadap Efisiensi dan SFC PLTD Kotaraya Eri Prabowoa; Trassanda Scudetto Widestomo Putra; Afristian Arief Dwiranda
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/ybb4c426

Abstract

Diesel power plants remain important for isolated electricity systems because they can be operated flexibly and maintained locally. This paper evaluates the effect of major overhaul on thermal efficiency and Specific Fuel Consumption (SFC) of a 1 MW Cummins KTA50 G8 diesel engine at PLTD Kotaraya. The study used operational logsheet data, commissioning test data, before-overhaul data, and after-overhaul data. SFC was calculated from fuel mass flow and engine power, while thermal efficiency was calculated from engine power, fuel mass flow, lower heating value, and combustion efficiency. The analyzed load levels were 50%, 75%, 85%, and 100% for before and after major overhaul. The results show that SFC after overhaul was lower than before overhaul at all comparable load levels: at 50% load from 267.143 to 238.000 gr/kWh, at 75% load from 245.192 to 238.000 gr/kWh, at 85% load from 255.000 to 230.000 gr/kWh, and at 100% load from 242.857 to 229.500 gr/kWh. Thermal efficiency also increased from 33.489% to 37.590%, 36.488% to 37.590%, 35.084% to 38.898%, and 36.838% to 38.982%, respectively. The findings indicate that major overhaul improved fuel economy and thermal performance, especially when the unit operated at higher load
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

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