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All Journal Jurnal Teknologi dan Riset Terapan (JATRA) Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Djumiati, Andri
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Aerospace Engineering Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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A Review Article: Impact of Using Critical Path Method (CPM) For Ship Repair Process Afsari, Sabila Fitri; Marassabessy, Amir; Sulistyawati, Wiwin; Suranto, Purwo Joko; Djumiati, Andri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 3 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i3.557

Abstract

Every ship that sails must be repaired to maintain seaworthiness and the safety of its users. Ship repairs that are carried out will take a considerable amount of time, so planning and scheduling must be completed before the repair process begins. The scheduling process at the shipyard is generally still done manually, involving the creation of a list of repairs. It has the potential to cause delays and increase the costs incurred. The use of the Critical Path Method (CPM) is an option to improve the effectiveness and efficiency of the repair process in terms of time and labor, and of course, minimize costs. This study aims to determine the effect of using the critical path method in the ship repair process, utilizing a literature review of several scientific articles. Of the 15 articles used in this study, 14 reported that the use of the critical path method enhances the effectiveness and efficiency of the ship repair process.
ANALISIS PROSES PENGELASAN REPLATING LAMBUNG KAPAL PADA KONDISI FLOATING TERHADAP NILAI KEKERASANNYA: PENGELASAN LAMBUNG KAPAL Djumiati, Andri; Mochammad Karim Al Amin; Egi Yuliora; Nurul Atik Hamida; Puspita Khumairoh; Deby Ardianti; Sabila Fitri Afsari
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.10850

Abstract

Replating the ship’s hull is an essential repair process to ensure that a vessel remains operationally seaworthy. Replating welding can be performed under both docking and floating conditions. These differing conditions influence the cooling rate, which in turn can result in variations in hardness (HV). This study examines the effect of varying the distance from the waterline (30, 60, 100, and 130 mm) and water temperature (25°C, 28°C, 30°C, and 32°C) on the hardness values produced during welding under floating conditions.Each variation combination was tested using the Vickers method with three repetitions, and the reported HV values represent the average of those measurements. The results show that the highest hardness value under floating conditions reached 218.5 HV (30 mm, 25°C), while the lowest was 195.7 HV (130 mm, 32°C). All measured hardness values remained within the acceptable limits specified by BKI for low-carbon steel.This study demonstrates that the closer the weld groove is to the water surface and the lower the water temperature, the higher the resulting hardness due to increased cooling rates. The limitations of this study include the absence of microstructural data and the unavailability of individual measurement data for further statistical analysis.
Co-Authors Afsari, Sabila Fitri Deby Ardianti Egi Yuliora Marassabessy, Amir Mochammad Karim Al Amin Nurul Atik Hamida Puspita Khumairoh Sabila Fitri Afsari Sulistyawati, Wiwin Suranto, Purwo Joko