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All Journal BALANCE: Economic, Business, Management and Accounting Journal Jurnal Fokus Manajemen Bisnis Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan Devotion: Journal of Research and Community Service Jurnal Maritim Malahayati International Journal of Science and Environment Journal of Artificial Intelligence and Digital Business Journal of Engineering Science and Technology Management Kohesi: Jurnal Sains dan Teknologi Impression : Jurnal Teknologi dan Informasi Indonesian Journal of Port and Shipping Management J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Smart Humanity: Jurnal Pengabdian Masyarakat
Kusumawati, Elly
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Journal : Journal of Engineering Science and Technology Management

 1 
Efforts to Increase Boil-Off Gas (BOG) Without Fuel Gas Pump in The State of Ballast Voyage at M.T. Coral Energy Airlangga, Areza Putri; Sutoyo; Kusumawati, Elly; Firdaus, Imam
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.333

Abstract

This study examines practical efforts to increase Boil-Off Gas (BOG) production without relying on the Fuel Gas Pump (FGP) during ballast voyage on the M.T. Coral Energy. In this condition, the vessel carries only a small amount of heel cargo, causing limited natural evaporation and a significant drop in tank pressure, which often results in insufficient BOG supply for the main engine. These operational constraints highlight the need for an alternative strategy that is both efficient and safer for cryogenic equipment.Using a qualitative descriptive approach, the research incorporates direct observation, structured interviews with deck officers, and operational documentation from the vessel. Data were analyzed using a fishbone framework to trace the root causes of low BOG production, focusing on technical, environmental, and human-factor aspects. The findings show that applying the top spray method using the deepwell pump effectively increases tank pressure and stabilizes BOG availability during ballast voyage. This method helps maintain a consistent gas supply for propulsion without adding mechanical load or maintenance risks to the FGP. The success of this approach depends largely on accurate flow control, careful pressure monitoring, and the crew’s understanding of the operational procedure. Overall, the study concludes that top spray is a reliable and energy-efficient alternative for BOG management when FGP use is minimized. The results are expected to support LNG carrier operations, particularly in optimizing fuel systems under low-cargo condition.
Optimizing The Implementation of Tank Coolingdown to Prepare For The LNG Loading Process on LNG Carrier Pan Africa Ships Dzaky, Muhammad Ahyar; Sutoyo; Kusumawati, Elly; Nur Prasetyo, Anugrah
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 1 (2026): Maret 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i1.334

Abstract

LNG cargo tanks are specifically designed to transport liquefied gas, and the coolingdown process becomes a critical stage prior to loading. This process is performed by spraying liquid gas through spray nozzles installed on the tank dome. This study employs a descriptive qualitative method, with data collected through observation, interviews, and documentation. The data were analyzed using the Miles and Huberman model, which consist of data condensation, data display, and conclusion drawing. The findings indicate that the coolingdown process on LNG/C Pan Africa generally complies with SIGTTO and IGC Code standards. However, two major issues were identified: a leakage in the cooldown valve on loading line number 2 caused by corrosion, which reduced the cooling rate from the standard 20°C/hour to approximately 10°C/hour, and a 1.5 hour delay in operating nitrogen system, which resulted in the IBS pressure not reaching the required 0.2-0.4 kPa. The study concludes that optimization of the coolingdown process can be achieved through preventive maintenance of the cooldown valve, improved coordination among officers, and enchanced accuracy in monitoring temperature and pressure. These recommendations are expected to improve the efficiency and safety pf LNG loading operations.
Co-Authors Ababil, Alfin Aditya, Ricko Airlangga, Areza Putri Anak Agung Istri Sri Wahyuni Arleiny, Arleiny Asdiana, Femmy Bariklana, Multazam Dahri, M Dai Robbi, Shofa Damanik, Antony Dirhamsyah Dzaky, Muhammad Ahyar Faris Nofandi Firdaus, Imam Fitroh Adhilla Ghina, Devita Kristiyono, Antonius Edy Lestari, Elise Dwi Mochklas, Mochammad Nasri Nasri, Nasri Nedo, Ryan Alexander Novaliana, Renta Nugroho, Azis Nur Prasetyo, Anugrah Prawoto, Agus Putri, Indah Ayu Johanda Rafasya, Agraprana Rahmawati, Maulidiah Retno Gunarti, Monika Robbi , Shofa Dai Romanda Annas Amrullah Rostantia, Titania Yeri Samudra, Bagus Purwo Sa’diyah, Halimatus Sianturi , Intan Sianturi, Intan Susanto, Novrico Sutoyo Sutoyo Sutoyo Teguh Pribadi Tri Haryanto Trisnowati Rahayu Wicaksono, Tegar Wildan Akbar Maulana Yuda, Anak Agung Ngurah Ade Dwi Putra Yudha, Prima Yudhianto, Prima Yudha Yusr, Daffa Izaz Rafi Afif Fauzi