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All Journal JURNAL SAINS DAN TEKNOLOGI MARITIM Journal of Innovative and Creativity
Hilmy , Zakwan
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Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Social Sciences Transportation Other

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ANALISA KESALAHAN SCANNING ARAH ROLLING PLATE PADA MATERIAL TMCP ( THERMO MECHANICAL CONTROL PROCESS ) TERHADAP INTERPRETASI LOKASI CACAT DENGAN METODE ULTRASONIC TESTING Indrianto, Totok Tjatoer; Susilo, Trisno; Hilmy , Zakwan
JURNAL SAINS DAN TEKNOLOGI MARITIM Vol. 25 No. 2 (2025): Maret
Publisher : UNIMAR AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33556/jstm.v25i2.485

Abstract

TMCP (Thermo-Mechanical Control Process) material, also called anisotropic steel, has recently been used frequently for industrial needs in ship construction, onshore and offshore fabrication. Where TMCP material has different characteristics in its wave propagation speed (velocity) in the material between the direction of plate rolling (rolling direction) which is parallel or longitudinal direction and the transverse direction. This causes the refraction angle of wave propagation to change, thus making the appearance of an indication different on the monitor screen when Ultrasonic Testing (UT) is carried out. The methodology used for this study is to use the literature study method and verification of test results. Where in verifying using the manual ultrasonic testing (MUT) procedure in accordance with DNVGL-CG-0051 revision 2015. The expected results in this study are to provide knowledge about the characteristics of TMCP material and its effects on ultrasonic testing. As well as calibration techniques, how to name saved files and ultrasonic testing on TMCP materials, so that there are no errors in interpreting an indication.
PENGARUH TINGGI NOZZLE TERHADAP DIMENSI AKHIR DAN KEKASARAN PERMUKAAN BENDA KERJA PADA PROSES PEMOTONGAN MENGGUNAKAN PLASMA ARC CUTTING Nugraha, Angga; Hilmy , Zakwan; Susilo, Trisno; Adi, Fajar Tyas
JURNAL SAINS DAN TEKNOLOGI MARITIM Vol. 25 No. 2 (2025): Maret
Publisher : UNIMAR AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33556/jstm.v25i2.461

Abstract

Penelitian ini bertujuan untuk mengkaji pengaruh tinggi nozzle pada proses pemotongan menggunakan Plasma Arc Cutting (PAC) terhadap dimensi akhir dan kekasaran permukaan benda kerja. Plasma Arc Cutting adalah metode pemotongan yang menggunakan busur plasma untuk memtong berbagai jenis material, yang populer dalam industri manufaktur. Tinggi nozzle, yang merupakan jarak antara nozzle plasma dengan permukaan benda kerja, diyakini mempengaruhi kualitas pemotongan. Penelitian ini mengevaluasi perubahan dimensi potongan dan kekasaran permukaan benda kerja pada variasi tinggi nozzle yang berbeda, serta memberikan gambaran mengenai hubungan antara parameter tersebut dengan hasil pemotongan.
Analisis Kinerja Kantor Kesyahbandaran dan Otoritas Pelabuhan (KSOP) terhadap Kelancaran Aktivitas Bongkar Muat di Pelabuhan Tanjung Balai Karimun Haswanda, Jeri; Hilmy , Zakwan
Journal of Innovative and Creativity Vol. 6 No. 1 (2026)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v6i1.7251

Abstract

Ports play a strategic role in supporting the smooth flow of national logistics; therefore, the operational performance of port authorities is a crucial factor in loading and unloading activities. This study aims to analyze the role and performance of the Port Authority and Harbormaster Office (KSOP) in supporting the smoothness of loading and unloading activities of steel cargo vessels at Tanjung Balai Karimun Port. The research employs a descriptive qualitative approach, with data collected through field observations, interviews, and documentation during an internship program at KSOP Tanjung Balai Karimun. Primary data were obtained from observations of 35 steel cargo vessels with a total cargo volume of 42,000 tons, interviews with KSOP officers, port operators, and shipping agents, as well as operational documentation. Secondary data were derived from KSOP operational reports, the Inaportnet system, and relevant literature. The results indicate that KSOP performance has a significant influence on the smoothness of loading and unloading activities, as reflected by an Effective Time to Berth Time (ET/BT) ratio of 62.4%, an average vessel waiting time of 0.85 hours, and a loading and unloading productivity rate of 26 tons per hour. Operational efficiency is supported by effective coordination among KSOP, port operators, and shipping agents; however, several constraints remain, including limited supporting facilities and potential administrative delays. This study concludes that optimizing digital-based service systems and strengthening inter-agency coordination are key strategies to improving loading and unloading performance at Tanjung Balai Karimun Port..
Co-Authors Adi, Fajar Tyas Angga Nugraha Haswanda, Jeri Indrianto, Totok Tjatoer Susilo, Trisno