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All Journal Jurnal Teknik Mesin
Eri Prabowoa
Institut Teknologi Perusahaan Listrik Negara (ITPLN)
Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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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
Co-Authors Afristian Arief Dwiranda Indra Kusumah Disastra Trassanda Scudetto Widestomo Putra