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All Journal Jurnal Simetris Majalah Ilmiah MOMENTUM INOVTEK POLBENG Infotekmesin Dinamika Bahari: Journal of Maritime Dynamic Majalah Ilmiah Gema Maritim Saintara : Jurnal Ilmiah Ilmu-Ilmu Maritim DEVICE Jurnal Visi Pengabdian Kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat Abdi Nusa Jurnal Pengabdian Kepada Masyarakat Abdi Putra Jurnal Maritim Polimarin Ocean Engineering: Jurnal Ilmu Teknik dan Teknologi Maritim JEPEmas: Jurnal Pengabdian Masyarakat (Bidang Ekonomi)
Khaeroman, Khaeroman
Politeknik Maritim Negeri Indonesia
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Implementasi Bunker Safety Checklist Untuk Meningkatkan Keselamatan dan Pencegahan Pecemaran Selama Bunkering Susanto; Khaeroman, Khaeroman; Widar Bayu Wantoro; Putranto, Wahyu Ari Putranto
Dinamika Bahari Vol 5 No 2 (2024): October 2024 Edition
Publisher : Politeknik Ilmu Pelayaran Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46484/db.v5i2.519

Abstract

Bunkering on ships is a very important job with a high risk of danger. Bunkering is moving liquid fuel oil from a bunker barge or bunker terminal. The process of transferring oil has the potential to cause pollution. Pollution can occur if an operational error occurs, such as an overflow, pipe, or bunker hose breaking. Overflow is one factor that most contribute to oil spills during the bunkering process. Oil overflow incidents by ships can result in expensive claims, with cleanup costs, penalties, and environmental damage running into millions of dollars. Studies to reduce the risk of oil pollution from bunkering operations need to continue. This study was carried out to know the implementation of the bunker safety checklist. The study was conducted using a case study method strengthened by a literature study. The study was conducted on board MT. Fatmawati with Dead Weight Tonnase (DWT) 7762 metric tons. The ship is driven by a diesel engine with a power of 2721 kW at 195 RPM. The 100% HFO capacity stored on board is 531.44 m3. The ship can also carry an HSD of 119.77 m3 at 100% capacity—security and safety considerations. The maximum fuel capacity that can be loaded is in the range of 80 - 90%. The study results obtained by implementing the bunker safety checklist in bunkering activities are highly recommended. Bunkering will be well planned, from planning, estimating the fuel loaded, and executing to reporting. Safety requirements and pollution prevention due to oil spills can be avoided with work planned and recorded in a checklist.
KARAKTERISASI MATERIAL BAJA CONNECTING ROD BEKAS SEBAGAI BAHAN PEMBUATAN ALAT GESEK FRICTION STIR WELDING (FSW) Putranto, Wahyu Ari; Susanto, Susanto Susanto; Khaeroman, Khaeroman; Herdawan, Deri; Noviarianto, Noviarianto Noviarianto; Kiswanto, Heri Kiswanto
Device Vol 15 No 1 (2025): Mei
Publisher : Fakultas Teknik dan Ilmu Komputer (FASTIKOM) UNSIQ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32699/device.v15i1.9039

Abstract

Permasalahan umum pengelasan las busur adalah retak saat proses peleburan dan pemadatan, timbulnya porositas, serta hilangnya elemen paduan yang mudah menguap. Penyambungan material lunak dapat dilakukan menggunakan pengelasan aduk gesekan yang disebut Friction Stir Welding (FSW). Alat pengaduk gesekan (Alat FSW) merupakan komponen penting pada pengelasan FSW. Penelitian ini dilakukan beberapa tahapan dengan tujuan menghasilkan alat FSW untuk material aluminium 5083. Studi dilakukan secara eksperimen mencakup desain alat FSW, perlakuan panas dan pengujian material alat FSW dan pembuatan alat FSW. Material dasar alat FSW yang dibuat menggunakan baut connecting rod bekas dari marine diesel engine. Model alat FSW yang dibuat dengan dua jenis pin (silinder berulir dan kerucut berulir). Alat FSW yang dibuat selanjutnya diberikan perlakuan panas suhu 950oC dan diquenching dengan media pendingin air dan oli. Hasil pengujian komposisi kimia menunjukkan baut connecting rod termasuk jenis baja AISI 4145. Hasil pengujian kekerasan nilainya sebesar 52,5 HRC, dan 51,5 HRC dari quenching media air dan oli. Pengujian struktur mikro material tersebut menunjukkan fasa martensit yang sifatnya keras dari proses quenching semua media pendingin. Penelitian ini menunjukkan bahwa material baut connecting rod bisa digunakan sebagai bahan alat FSW setelah diberi perlakuan panas dan quenching dengan media air.
Pelatihan Perhitungan NPV bagi Kelompok PKK RW 01 Kupang Rengas Ambarawa Untuk Peningkatan Kapasitas Jiwa Kewirausahaan Anggoro, Retno; Winarni, Endra; Khaeroman, Khaeroman; Susanto, Susanto; Bayu, Rahindra; Suprapti, Fitri; Trihudiyatmanto, M.; Efendi, Bahtiar; Purwanto, Heri; Nurhayati, Eni Candra
JEPEmas: Jurnal Pengabdian Masyarakat (Bidang Ekonomi) Vol. 4 No. 1 (2025): April 2025
Publisher : UP2MF Fakultas Ekonomi dan Bisnis, Universitas Sains Al-Qur'an (UNSIQ) Jawa Tengah di Wonosobo

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

UMKM menjadi salah satu sektor yang memiliki potensi besar dalam menggerakkan roda perekonomian, menciptakan lapangan kerja, serta meningkatkan kesejahteraan masyarakat. UMKM memiliki peran penting dalam perekomomian namun tergolong kelompok usaha marjinal. Kelompok UMKM dalam menjalankan usaha secara umum penggunaan teknologi sederhana, modal kecil, akses kredit terbatas, dan hanya berorientasi pasar lokal. Namun, tantangan yang dihadapi UMKM tidaklah sedikit, terutama terkait dengan pemahaman akan manajemen keuangan yang baik dan berkelanjutan. Perhitungan Nett Present Value (NPV) bagi Pelaku Usaha Mikro Kecil dan Menengah merupakan langkah penting untuk meningkatkan pemahaman dan kemampuan para pelaku UMKM dalam mengelola keuangan mereka. Kegiatan Pengabdian kepada Masyarakat (PKM), terkait pelaksanaan pendampingan dilakukan dengan penyuluhan. Interaksi dua arah antara narasumber dengan peserta baik interaktif. Kegiatan ini dilakukan melalui metode ceramah, diskusi dan tanya jawab. Tahapan PKM tersebut meliputi; pra proposal, proposal, kegiatan inti, dan evaluasi. Kegiatan dilaksanakan dengan melibatkan melibatkan kader PKK, dan warga RT 2/RW 1 Kupang Rengas, Kel. Kupang Kec. Amabarawa, Kab.Semarang. Kegiatan dikemas melalui serangkaian sesi pelatihan yang interaktif dan mendalam. Pelaksanaan PPM ini memperoleh hasil yang disimpulkan bahwa peningkatan pemahaman para pelaku UMKM terhadap manajemen keuangan memberikan dampak positif yang signifikan terhadap pengambilan keputusan investasi yang lebih bijak. Mereka mampu memahami secara lebih mendalam mengenai risiko-risiko yang terlibat dalam suatu investasi, sehingga mampu membuat keputusan yang lebih terinformasi dan lebih rasional. Setelah pelaksanaan PKM juga diketahui hal-hal yang perlu dilakukan sebagai saran peningkatan. Saran paling pokok adalah kegiatan ini perlu dilakukan berkelanjutan serta disiapkan hubungan dengan instansi pemerintah yang terkait dengan ekonomi kemasyarakatan.
Analisa Kegagalan Ring Piston Mesin Diesel Type YMD MAN B&W(5S35MC-C9-2) di KM. Spil Hasya Ngatmin, Ngatmin; Oscar, Yulius; Santoso, Gunawan Budi; Juwarlan, Juwarlan; Khaeroman, Khaeroman
Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim Vol. 2 No. 4 (2023): Desember : Jurnal Ilmu Teknik dan Teknologi Maritim
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/ocean.v2i4.1903

Abstract

The research method used was a qualitative experiment, starting with taking broken piston rings No. 2 and 3, cutting the piston rings and testing them with hardness tests and composition tests carried out at the Indonesian State Maritime Polytechnic and Undip Central Java Integrated Lab. From the results of this research, it can be concluded that the used broken ring number 3 has the highest hardness of 140.26 HB and the used ring number 2 is 131.50 HB, so it can be concluded that the piston ring that has been used and exposed to high heat causes an increase in hardness and causes it to break. The composition test results showed that the carbon content of the new ring no. 2 was the highest at 15.30% and that in the used ring no. 2 was 12.08% because the compression ring was in direct contact with the compression chamber or in contact with heat. For the used number 3 piston ring, the carbon content is 10.43 and the new one is 11.02 because it is positioned below the compression ring and is not in direct contact with heat. for the used ring no.2, the Silicon (Si) content is low, namely 2.15% compared to the new one, 2.75% because the nature of Silicium is that it is resistant to high temperatures and as a compression ring compared to ring no.3, fracture occurs because there are no Manganese or Phosphate elements. which is wear resistant, strong and elastic. The microstructure of piston ring No. 2 is broken and the new two piston rings are less dense and have rough gaps. The broken piston ring structure of No. 3 and the new one looks a bit gray and has high levels of graphite iron and carbon elements.
Pemodelan dan Ekperimental Performa Variasi Tekanan Kerja Injektor Mesin Diesel Induk Kapal terhadap Bentuk Semburan Nosel dan Temperatur Gas Buang Tiap Silinder Ari Putranto, Wahyu; Khaeroman, Khaeroman; Susanto, Susanto; Nugroho, Agung
Majalah Ilmiah Gema Maritim Vol 25 No 2 (2023): Gema Maritim Vol 25 No 2 Bulan September 2023
Publisher : Politeknik Bumi Akpelni

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37612/gema-maritim.v25i2.340

Abstract

The main diesel engine is a main propulsion engine that functions to move the ship. Diesel engines include the type of internal combustion engine (internal combustion engine). The combustion ignition process is carried out by spraying fuel into pressurised and high-temperature air due to compression. An injector is a device used to fog fuel. The purpose of this study is to obtain optimal parameters for the performance of the injector's working pressure. The methods used in this study are experimental and modelling. The data obtained are spray angle, length, time, and number of particles sprayed. The method used in this study is by testing injectors experimentally and simulating using CFD software. The injector input pressure parameters are 280, 300, and 320 bar while the nozzle diameter is 0.3 mm. The data obtained on the ship was then tested experimentally and simulated. In this study, there were 3 injector parameters tested. The test results of the three parameters on the injector obtained optimum data, namely at a working pressure of 320 bar nozzle diameter of 0.3 mm resulting in a spray angle of 14o, spray length of 100 mm with the fastest time of 0.00143 seconds to produce a speed of 69930.07 mm / s. The number of particles produced is 1.185071x103, so the fogging process is perfect (bursts evenly in all directions) and the temperature of the cylinder exhaust gas is 340-3600C.
Optimalisasi Peralatan Inert Gas System untuk Pencegahan Terjadinya Ledakan Pada Tangki Minyak di Kapal Tanker Khaeroman, Khaeroman; Noviarianto, Noviarianto; Ridwan, Ridwan
Jurnal Maritim Polimarin Vol. 11 No. 2 (2025)
Publisher : PPPM Polimarin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52492/jmp.v11i2.131

Abstract

Oil tankers are a type of vessel specifically designed to transport oil or its derivatives. One of the preventive safety measures employed on these ships is the inert gas system—a system that generates gas with low oxygen content to prevent explosions onboard. However, an increase in oxygen concentration in the inert gas is a common issue encountered, which makes optimizing the performance of the inert gas system a matter of serious concern. The methodology adopted in this research is descriptive qualitative, with the inert gas system aboard MT. NORDDOLPHIN serving as the primary research object. Data collection was carried out through several approaches, including direct field observation, interviews with relevant personnel, and a literature review of technical documents such as instruction manuals and standard operating procedures (SOP) available on the vessel. The study demonstrates that the rise in oxygen content in inert gas is caused by inadequate maintenance of the fuel oil control valve and a dirty main burner, which leads to an imbalance in the combustion ratio. The effort undertaken to keep the oxygen level below the threshold of 4% involves lowering the correction factor on the boiler. This adjustment increases the fuel supply during combustion, which in turn raises the carbon dioxide concentration and lowers the oxygen level in the inert gas
Pengaruh Post Welding Heat Treatment (PWHT) Pada Friction Stir Welding Pada Material Aluminium AA5052/6061 Terhadap Sifat Mekanik dan Struktur Mikro Ari Putranto, Wahyu; Khaeroman, Khaeroman; Nuriyanis, Akhmad; Suharso, Arif Rakhman; Sirait, Evi
Infotekmesin Vol 17 No 1 (2026): Infotekmesin: Januari 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v17i1.3056

Abstract

The development of technology in the maritime sector is very rapid in the manufacture of aluminum ships. Friction Stir Welding (FSW) is a green technology in the metal joining process. Post Welding Heat Treatment (PWHT) is one way to increase the loss of strength of the material connection after the FSW process. The purpose of this study was to determine the effect of FSW results before and after PWHT. Aluminum alloy (AA) series 5052 and 6061 were used as research materials because they are resistant to seawater. FSW parameters were spindle speed 1500 rpm (clockwise), travel speed 30 mm/min, tool depth 0.2 mm, and tool tilt 1o. PWHT parameters were heating the FSW material in a furnace to a temperature of 550°C (10, 30 minutes), water quenching, and artificial aging to a temperature of 180°C for 7 hours. The material was characterized by tensile testing, hardness, and micrography. The highest tensile strength and hardness values were 216 MPa and 68 HV, the smallest and uniform grain size in the weld zone and base metal areas were obtained at PWHT parameters of 30 minutes.
Studi Penentuan Gravity Disc untuk Peningkatan Kinerja dan Mencegah Terjadinya Overflow MFO Purifier Pasca Bunker Wahyu A. Putranto; Susanto Susanto; Khaeroman Khaeroman
Saintara: Jurnal Ilmiah Ilmu-Ilmu Maritim Vol 7 No 1 (2023): SAINTARA (Maret 2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat, Akademi Maritim Nusantara Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52475/saintara.v7i1.200

Abstract

Minyak berat sejenis Heavy Fuel Oil (HFO) memiliki karakteristik berwarna hitam, mengandung partikel padat dan residu, pada suhu rendah sangat kental seperti bitumen. Nilai density HFO berkisar antara 0.92-0.99 kg/L dengan kekentalan yang ada dipasaran 180 dan 380 Cst. Perbedaan tempat bunker seringkali berakibat pada perbedaan technical data bahan bakar yang disuplai ke kapal. Efek yang sering terjadi dari perubahan nilai density adalah terganggunya proses treatment pada purifier. Penurunan efisiensi pengisian HFO service tank karena overflow pada purifier merupakan masalah utama yang sering timbul karena nilai density. Berdasarkan fenomena yang terjadi pada proses purifikasi Heavy fuel Oil pasca bunker maka perlu dilakukan studi dalam menentukan gravity disc pada FO purifier. Studi dilakukan dengan tujuan untuk memberikan solusi kepada engineer yang bertugas di kapal-kapal niaga apabila terjadi masalah serupa. Penelitian dilakukan menggunakaan metode studi kasus terhadap permasalahan riil yang terjadi di atas kapal. Asumsi yang digunakan dalam memecahkan persoalan dengan membatasi tangki tempat proses pencampuran di settling tank. Bahan bakar HFO tersisa dalam storage tank adalah 0%, sedangkan bahan bakar tersisa di settling tank 4 KL dengan specific gravity 0.993 kg/L dari total volume 10 KL. HFO yang disuplai saat bunker dengan specific gravity 0.925 kg/L. Studi yang dilakukan mendapatkan hasil gravity disc yang sesuai untuk HFO dengan specific gravity 0.993, 0.975 dan 0.925 kg/L berturut-turut 66, 75 dan 78 mm. Temperatur pemanasan 80 dan 90OC tidak mempengaruhi ukuran gravity disc. Kinerja purifier dapat ditingkatkan dengan mencegah overflow melalui penentuan gravity disc yang sesuai.
Pengaruh Perubahan Vakum dan Temperatur Pemanas Fresh Water Generator terhadap Produksi Air Tawar di MT. PM REGENT Susanto Susanto; Khaeroman; Yulius Oscar; Ngatmin Ngatmin; Heri Kiswanto
Saintara: Jurnal Ilmiah Ilmu-Ilmu Maritim Vol 8 No 2 (2024): SAINTARA (September 2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat, Akademi Maritim Nusantara Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52475/saintara.v8i2.343

Abstract

Fresh onboard water is required to fulfill the crew's living needs and support the ship's operations. The need for fresh water for the crew and operational support of the boat is fulfilled with fresh water purchased from the land. Water purchases can be made when the ship is in port, either when the ship is at the dock or when the boat is anchored. Additional fresh water supply can be obtained continuously while the ship is sailing. Seawater desalination is a solution to produce fresh water to fulfill the new water needs. Desalination using a freshwater generator (FWG) involves evaporation and condensation processes affected by vacuum and operating temperature. This study was conducted to determine the effect of changes in pressure and temperature parameters on the production capacity of the freshwater generator. The study was conducted using a case study method through observation, and experimentation on board MT.PM REGENT. The vacuum in the FWG chamber was varied based on the suction of the vacuum ejector. Hot water temperature as a heater in the evaporator is taken from the cooling jacket of the main engine. The result of the pump ejector pressure variation greatly affects the vacuum level of the distillation chamber At pump ejector pressures between 8 – 16 Bar, the vacuum rate can reach 99 – 100% after the pump is operated At pressures of 2 and 4 Bar, the vacuum level drops dramatically, reaching only 50 and 80 %, respectively. The lowest production of FWG when operated with 80% vacuum with a heating temperature of 75 OC is 2767 liters/day. In FWG operation with a maximum vacuum of 100% and a heating temperature of 85 OC, it is able to produce the most fresh water around 6879 liters/day. Based on the changes in parameters, it can be concluded that a decrease in the level of vacuum and heater temperature reduces the production of fresh water from the Fresh Water Generator.
Co-Authors ABDUL HAMID Agung Nugroho Akhmad Nuriyanis Arif Rakhman Suharso Ario Hendartono Bahtiar Efendi Bayu, Rahindra Deri Herdawan Dwi Ratnandari, Septina Dwi Retnandari, Septina Erwin Sutantyo Faizal Reza, Bela Fitri Suprapti Gunawan Budi Santoso Heri Kiswanto Heri Purwanto Ilham Putranto, Angga Juwarlan Juwarlan, Juwarlan Kiswanto, Heri Kiswanto M. Trihudiyatmanto masriah masriah, masriah Muhammad Edi Azmi Ngatmin Ngatmin Ngatmin, Ngatmin Noor Taufiq Saleh Noviarianto, Noviarianto Nugroho, Agung Nurhayati, Eni Candra Okpina Rochadian Prijo Harsono Priyanto, Tegar Retnandari, Septina Dwi Ridwan, Ridwan Rifki Arya Wiguna Sirait, Evi Solly Aryza Suprapti, Fitri Susanti Susanti Susanto Susanto Susanto Susanto Sutrimo Suyono Suyono Wahyu A. Putranto Wahyu Ari Putranto Widar Bayu Wantoro Winarni, Endra Yulius Oscar Yulius Oskar Zaghlul Nafis, Ragil