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All Journal Pendas : Jurnah Ilmiah Pendidikan Dasar Bulletin of Community Engagement Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Jurnal Maritim Malahayati Journal of Engineering Science and Technology Management Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Agus Prawoto
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Religion Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Transportation Other

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Journal : journal of engineering science and technology management

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Analysis of Performance Degradation of the Refrigeration System on MT Nolowati III Sahrul Romadon; Moejiono; Mochammad Zainuddin; Agus Prawoto; Prima Yudha Yudianto
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 2 (2026): June 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i2.408

Abstract

The refrigeration unit, also known as the refrigerator, is a crucial auxiliary machine on board the MT Nolowati III, as it is responsible for ensuring the crew remains healthy and refreshed. A common operational issue is the refrigeration unit's inability to reach its designated operating temperature. This includes the meat compartment (-10°C to -12°C) and the vegetable/fruit compartment (+4°C to +10°C). Suboptimal supporting components such as the compressor and thermostat, as well as a lack of standard maintenance, contribute to this issue. Analysis shows that the decline in performance is mostly caused by technical factors, such as dirt covering the condenser or thermostat errors, which disrupt the refrigeration cycle and cause temperature increases. To prevent this, preventative measures focus on regular maintenance, routine condenser cleaning, and performing maintenance work according to the manual's instructions.
Analysis of Electrical Voltage Instability Causes in Auxiliary Engine No. 2 Aboard MV. HANGLIMA Bima Nurrahma; Antonius Edy Kristiyono; Agus Prawoto; Shofa Dai Robbi; Sri Mulyanto
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 2 (2026): June 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i2.410

Abstract

This study investigates the factors contributing to electrical voltage instability in Auxiliary Engine No. 2 aboard MV. Hanglima. The research was motivated by operational disruptions where the voltage output dropped significantly from the standard 440V to 290V, leading to blackouts when the generator operated independently. Employing a qualitative research method utilizing the Fishbone (Ishikawa) diagram for root cause analysis, data was collected through onboard observation, documentation, and interviews with the engineering crew. The analysis revealed that the instability was primarily caused by mechanical failure in the alternator bearings, which had approached their operational limit, leading to an unbalanced rotor rotation. This mechanical imbalance caused friction between the rotor and stator, resulting in insulation leakage (short circuits) within the windings. Corrective measures implemented included a comprehensive overhaul, re-insulating the rotor and stator windings using insulating varnish, and replacing the worn bearings. These actions successfully restored the voltage output to a stable 445V, ensuring the safety and efficiency of the vessel's electrical system.
Co-Authors Adiisty Nur Fadilla Alia, Diana Antonius Edy Kristiyono Bima Nurrahma Cicilia Kunti Dewi Cahyaningtyas Dirhamsyah Dirhamsyah Elise Dwi Lestari Elly Kusumawati Faris Nofandi Frenki Imanto Hidayat, Rochmad Ibnu Septian, Wahyu Imam Sutrisno Mochammad Zainuddin Moejiono Monika Retno Gunarti Muh. Darwis Perwi Darmajanti Prima Yudha Yudianto Putri, Indah Ayu Johanda Rahajeng Galih Ayu Putri Basuki Rama Syahputra Simatupang Reza Putra Susanto Sahrul Romadon Shofa Dai Robbi Sianturi, Intan Siti Fatimah Sri Mulyanto Wulan Marlia Sandi