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All Journal International Journal of Advances in Applied Sciences Jurnal Penelitian Pendidikan IPA (JPPIPA) INTEK: Jurnal Penelitian Jurnal Teknik Mesin Sinergi Jurnal Venus Journal of Renewable Energy and Smart Device

Mahadir Sirman

Politeknik Ilmu Pelayaran Makassar

Author-ID : 5336366

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation Other

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Articles

Penerapan Personal Protective Equipment Pada Workshop Politeknik Ilmu Pelayaran Makassar Syahrisal Syahrisal; Paulus Pongkessu; Mahadir Sirman; Heny Pasandang Nari
Jurnal Teknik Mesin Sinergi Vol 17, No 2 (2019): Oktober 2019
Publisher : Politeknik Negeri Ujung Pandang

Implementation according to the rules of occupational safety and health is needed in all jobs that are useful to avoid things that are not desirable, such as work accidents. The workforce consists of educated and trained people. One of the educated people referred to is the D-IV and DP-III graduates of the Makassar Shipping Polytechnic, because one of the fillers in the world of work is the Polytechnic graduate. The learning process while in the laboratory must be a serious concern in order to get qualified prospective workers, especially understanding about the application of occupational safety and health (K3) especially the use of personal protective equipment so that there are no direct or indirect obstacles in the work, such as work accidents occur, damage to machinery, cessation of production processes, environmental damage and expenses related to work accidents. The purpose of this research is to find out the availability and analyze the application of personal protective equipment to occupational safety and health in the workshop. This research includes the type of survey research with quantitative methods. This design seeks to determine the PPE facilities available at the Workshop, symbols / cues about occupational safety and health, the conditions of the practice room and what percentage of PPE use by cadets during practice. The data collection method is done by using a questionnaire and documentation used to determine PPE facilities available in the Workshop, symbols / cues about occupational safety and health, the conditions of the practice room and what percentage of the use of PPE cadets during practice. The conclusion is that the personal protective equipment (PPE) facilities in the workshop have been provided by the workshop and can be used by cadets or pasis and safely in accordance with government regulations, and the knowledge, understanding and application of cadets towards PPE have reached an average of 95%

ANALISA PERAWATAN EXHAUST VALVE MESIN INDUK UNTUK MENUNJANG PENGOPERASIAN MESIN DI KAPAL WESTEA GAIL Paulus Pongkessu; Mahadir Sirman; Helmonius Toding
JURNAL VENUS Vol 7 No 14 (2019): September
Publisher : PIP Makassar

Penelitian ini bertujuan untuk lebih memahami cara melaksanakan perawatan katup buang mesin induk dan untuk lebih memahami faktorfaktor yang dapat menunjang perawatan katup buang mesin induk sehingga pengoperasian mesin induk dapat dilakukan sesuai dengan prosedur. Penelitian ini dilaksanakan pada kapal Westsea Gail selama 12 bulan yaitu pada tanggal 05 Mei 2017 sampai dengan tanggal 15 Mei 2018. Sumber data yang digunakan yaitu data primer dan data sekunder, sedangkan metode analisis yang penulis gunakan yaitu analisis kualitatif yang diperoleh dalam bentuk variabel berupa informasi yang berasal dari atas kapal Westsea Gail. Hasil yang diperoleh setelah dianalisis menunjukkan bahwa pertama : terjadinya kerusakan pada katup buang di karenakan tidak dilaksanakannya perawatan sesuai dengan jadwalnya, kedua : Kegagalan katup yang mengalami pembebanan termal karena suhu tinggi dan tekanan di dalam silinder. Kondisi kegagalan karena suhu tinggi pada sifat mekanik bahan dan korosi terlihat berupa patahan pada lapisan katup buang serta adanya pengendapan (deposit) baik pada katup buang (exhaust valve) atau katup hisap.

ANALISIS PENGARUH PERUBAHAN TEMPERATUR AIR PENDINGIN TERHADAP KINERJA FRESH WATER COOLER PADA MESIN INDUK DI KAPAL MV. KALLA LINES XV Paulus Pongkessu; Yopie Pesulima; Henny Pasandang Nari; Adnan Adnan; Mahadir Sirman
JURNAL VENUS Vol 6 No 12 (2018): Desember
Publisher : PIP Makassar

Penelitian ini bertujuan untuk (1) Mengetahui pengaruh perubahan temperature terhadap penyerapan panas pada Fresh Water Cooler Mesin Induk di Kapal Tujuan Penelitian. (2) Menghitung laju perpindahan panas pada cooler. (3) Menghitung persentase penyerapan panas yang terjadi pada cooler. Metode yang dilakukan adalah (1) Mengambil data secara langsung terhadap obyek yang diamati. (2) Kajian literature terhadap teori-teori yang mendasari permasalahan yang ada serta penjelasan dari pembimbing. (3) Studi pustaka dilakukan dengan membaca dan mengutip literature yang relevan dan berkaitan dengan masalah yang akan dibahas. Hasil penelitian menunjukkan bahwa: (1) Semakin Tinggi temperature air tawar pendingin mesin masuk kedalam cooler maka semakin tinggi pula temperatur yang yang keluar dari cooler dan temperature air laut sebagai pendingin air tawar yang keluar dari cooler juga semakin tinggi karena dipengaruhi oleh temperature air tawar yang diserap oleh air laut. Disarankan Untuk mendapatkan temperature selalu dalam keadaan normal maka disarankan perawatan cooler dapat dilakukan secara berkala dengan cara membersikan pipa-pipa kapiller.

Analisis Menurunnya Produksi Air Tawar Pada Fresh Water Generator Di Kapal MT. BULL KALIMANTAN Iswansyah Iswansyah; Mahadir Sirman; Sultan Ma’arif
JURNAL VENUS Vol 9 No 2 (2021): September
Publisher : PIP Makassar

Tujuan penelitian adalah mengetahui hal-hal yang menyebabkan menurunnya kapasitas produksi Fresh Water Generator di kapal. Penelitian dilaksanakan di MT. Bull Kalimantan milik perusahaan PT. Buana Lintas Lautan selama 12 bulan yakni dari tanggal 03 Agustus 2018 sampai 06 Agustus 2019. Sumber data yang diperoleh adalah data yang didapatkan langsung dari tempat penelitian dengan metode observasi dan juga metode kepustakaan berupa dokumen-dokumen, instruction manual book serta buku-buku yang berkaitan dengan penelitian ini. Hasil penelitian ini menunjukkan penyebab adanya gangguan penyerahan panas pada Fresh Water Generator dikarenakan adanya scale atau kerak-kerak yang melengket pada evaporator shell tube, sehingga terjadi penurunan penyerahan panas dimana mengakibatkan jumlah air tawar yang dihasilkan mengalami penurunan dari kondisi normal.

Analisis Menurunnya Produksi Air Tawar Pada Fresh Water Generator Di Kapal MT. Gloria Sentosa Mahadir Sirman; Syahrisal
JURNAL VENUS Vol 11 No 1 (2023): Maret
Publisher : PIP Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48192/vns.v11i1.690

Penelitan ini bertujuan untuk menganalisis menurunnya produksi air tawar pada fresh water generator di atas kapal MT. GLORIA SENTOSA. Peneliti melakukan penelitian di kapal Motor Tanker. GLORIA SENTOSA. Kapal tersebut milik perusahaan PT. HAYUMI SEIKO MARU. Selama 12 bulan yaitu pada tanggal 25 Juli 2020 hingga 25 Juli 2021. Metode penelitian yang digunakan adalah metode kualitatif. Data diperoleh langsung dari tempat penelitian dengan metode observasi serta dengan cara metode kepustakaan seperti dokumen, buku pedoman, buku-buku yang berkaitan dengan topik. Hasil penelitian ditemukan adanya penyempitan aliran pada nozzle injektor dan adanya endapan padat seperti kerak yang menempel di plat evaporator dan kondensor dapat mengurangi panas dalam tabung evaporator dan mengurangi jumlah air laut yang masuk ke evaporator.

Comparative Study of Laboratory Management: Study Case of Ujung Pandang State Polytechnic and Makassar Merchant Marine Polytechnic Hasiah, Hasiah; Risal, Syah; Nari, Henny P; Sirman, Mahadir
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.3708

The laboratory role is huge in determining the quality of education because the laboratory produces proud scientific works, which other institutions cannot make. To get quality universities, laboratories are a priority. The laboratory is an integral part of the academic field. Laboratory management needs to be aligned with educational planning (programs and budgets). This research was carried out at the Ujung Pandang State Polytechnic (PNUP) and the Merchant Marine Polytechnic (PIP) Makassar. This research method is a comparative research type. Data collection techniques used are observation, interviews, and documentation. The method of analysis was using quantitative descriptive analysis. The results show that the Ujung Pandang State Polytechnic has a laboratory with laboratory management that is very concerned about the curriculum/module/syllabus, which is updated regularly. Comparing management laboratory includes a) understanding and access freely the modules for students, b) online laboratory schedule, c) the ratio of teachers according to the Higher Education standard of 1 : 8. For Laboratory Management at the Ujung Pandang State Polytechnic using the SOP for practicum implementation managed by a laboratory technician who has a certificate for the use of laboratory equipment. Some technicians are always available at the laboratory. The ideal laboratory to consider the ratio between the area of the laboratory room and the number of practitioners, the balance between teachers and students, the proportion of equipment, facilities, room conditions, and the equipment used condition.

Performance Testing of Jute Fiber-Reinforced Composite Resin as a Crewboat Building Material Mahadir Sirman; Henny Pasandang Nari; Syahrisal; Muhammad Arsyad Suyuti
Jurnal Penelitian Pendidikan IPA Vol 11 No 12 (2025): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i12.13376

The maritime industry requires lightweight, strong, corrosion-resistant, and environmentally friendly materials, particularly for crewboat construction. Conventional metallic materials often suffer from corrosion, high weight, and elevated maintenance costs. This study investigates the mechanical performance of epoxy–jute fiber composite materials as a sustainable alternative for crewboat hull applications. Experimental laboratory testing was conducted using a quantitative approach to evaluate the tensile strength, flexural strength, impact resistance, and environmental durability of the composites. Specimens were fabricated using epoxy resin reinforced with jute fibers arranged in four different orientations (0°, 45°, 90°, and random) and tested according to ASTM standards. The results indicate that fiber orientation significantly influences mechanical properties. The 0° fiber orientation exhibited the highest tensile strength (89.04 MPa) and elongation (1.287%), indicating efficient load transfer and good ductility. The 45° orientation produced the highest flexural strength (39.14 MPa), while the random fiber orientation demonstrated the greatest elastic modulus (25.81 GPa) and impact resistance (6.409 kJ/m), providing superior stiffness and energy absorption. Seawater immersion tests showed no visible degradation in the composite structure. These findings suggest that epoxy–jute fiber composites have strong potential as eco-friendly crewboat construction materials, especially when applied using hybrid laminate configurations (0°/±45°/random) to optimize strength, stiffness, and impact resistance

LNG-Based Decarbonization of Small-Scale Maritime Transport: A Technical and Economic Feasibility Study in North Kalimantan Nari, Henny Pasandang; Kim, Yong Wong; Sirman, Mahadir; Sumardiawan, Romy
Journal of Renewable Energy and Smart Device Vol. 3 No. 2 April 2026
Publisher : PT. Global Research Collaboration

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66314/joresd.v3i2.700

Indonesia's vast natural gas reserves present a strategic opportunity to decarbonise its maritime sector, particularly in archipelagic regions such as North Kalimantan, where small wooden and fiberglass vessels rely on high-cost, high-emission diesel fuels, posing environmental and economic challenges. This study employed a mixed-methods approach, combining fuel consumption simulations with stakeholder surveys and interviews to evaluate the technical, economic, and policy feasibility of adopting liquefied natural gas (LNG) for non-conventional inter-island vessels. The technical analysis compared LNG and biodiesel performance on a Mitsubishi 89 kW marine engine regarding thermal efficiency, specific fuel consumption (SFC), and operational costs. Simulation results show that LNG-powered engines achieved 46.46% thermal efficiency and an SFC of 0.140 kg/kWh, compared to 33.85% and 0.1847 kg/kWh for biodiesel. An economic feasibility analysis across eight inter-island routes demonstrated fuel cost savings of 51–68% with LNG relative to biodiesel, with an estimated simple payback period of 3.2–4.5 years for dual-fuel engine retrofitting under baseline fuel price assumptions. Stakeholders acknowledged LNG's benefits but raised concerns about infrastructure limitations and regulatory readiness. This study concludes that LNG adoption for non-conventional vessels is economically and environmentally viable, particularly when aligned with Indonesia's broader energy transition strategies, and provides a scalable model for other archipelagic maritime regions seeking to reduce emissions and fuel dependency.

Experimental study on annealing S45C steel: effect of temperature and time on hardness, impact strength Sirman, Mahadir; Syahrisal, Syahrisal; Pasandang, Henny; Nur, Rusdi; Faraby, Muhira Dzar; Mukhlisin, Mukhlisin
International Journal of Advances in Applied Sciences Vol 15, No 1: March 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v15.i1.pp343-354

Steel generally exhibits poor wear and friction resistance, making it necessary to improve its surface mechanical properties, particularly hardness and microstructure, to enhance performance. Heat treatment is one of the most effective methods for achieving these improvements. This study aimed to optimize the heat treatment parameters of S45C medium-carbon steel to improve hardness and impact strength using response surface methodology (RSM). Experimental trials were conducted at annealing temperatures of 800 °C, 850 °C, and 900 °C with holding times of 30, 60, and 90 minutes, followed by cooling in water, oil, or air. Hardness (HRC) and impact strength (Nm/mm²) were measured, and the data were analyzed using RSM with a central composite design (CCD). Quadratic models were found to be statistically significant for both hardness (Prob > F = 0.0222) and impact strength (Prob > F = 0.0338), confirming their validity. The optimization results indicated that a holding time of 60 minutes within the 850-900 °C range provides the best balance between high hardness (>55 HRC) and adequate impact strength (>0.68 Nm/mm²). These findings not only validate the predictive capability of RSM in heat treatment optimization but also provide practical guidelines for industrial applications of S45C steel in automotive, tooling, and structural components.

Co-Authors Adnan Hasiah, Hasiah Helmonius Toding Henny Pasandang Nari Heny Pasandang Nari Iswansyah Iswansyah Kim, Yong Wong M. Iqbal Mukhsen Muhammad Arsyad Suyuti Muhira Dzar Faraby, Muhira Dzar Mukhlisin Mukhlisin Nari, Henny P Nari, Henny Pasandang Pasandang, Henny Paulus Pongkessu Paulus Pongkessu Rusdi Nur Rusdi Nur Sultan Ma’arif Sumardiawan, Romy Syah Risal Syahrisal Syahrisal Syahrisal Syahrisal Syahrisal, Syahrisal Yopie Pesulima

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