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All Journal Dinamika Bahari: Journal of Maritime Dynamic Jurnal Universal Technic Sejahtera: Jurnal Inspirasi Mengabdi Untuk Negeri Jurnal Teknik Mesin, Industri, Elektro dan Informatika Jurnal Penelitian Rumpun Ilmu Teknik Ocean Engineering: Jurnal Ilmu Teknik dan Teknologi Maritim Jurnal Sains Bangunan
Sunu Arsy Pratomo
Universitas Maritim AMNI Semarang
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Transportation Other

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Analisis Produktivitas Proyek Reparasi Kapal Tanker pada PT. Janata Marina Indah Muhammad Rizki Kurniawan; Sunu Arsy Pratomo; Mu’izzaddin Wa’addulloh
Jurnal Sains Bangunan Vol 2 No 2 (2025): Jurnal Sains Bangunan Edisi September 2025
Publisher : FAKULTAS TEKNIK ITBADLA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58906/alsaba.v2i2.175

Abstract

Proses docking kapal sebaiknya dilakukan secara tepat waktu. Proses perbaikan kapal yang baik tentunya didukung oleh Quality Control dan Quality Assurance yang baik serta sumber daya manusia yang mendukung. Manajemen proyek merupakan kegiatan pengelolaan proyek yang meliputi perencanaan, pengorganisasian, serta pengawasan proyek guna mencapai tujuan yang telah ditetapkan. Critical Path Method merupakan metode yang diterapkan guna penjadwalan suatu aktivitas yang menjadi elemen kritis pada proyek. Produktivitas pengecatan mandays (PrM) diketahui hasil perhitungan dari kapal MT. Succes Victory dan MV. Lintas Brantas dengan kode (MT) memiliki Volume Pekerjaan (VP) sebesar 676.30 dibagi Tenaga Kerja (TK) dan Durasi Kegiatan (DK), jumlah Tenaga Kerja (TK) 11 Orang dan hasil dari Durasi Kegiatan (DK) yaitu 17 Hari dan hasil dari nilai Volume Pekerjaan (VP) dibagi Tenaga Kerja (TK) dan Durasi Kegiatan (DK) memperoleh hasil PrM dengan nilai 3,62. Dari total pekerjaan pengecatan sangat baik. Produktivitas pipa mandays (PrM) diketahui hasil perhitungan dari kapal MT. Succes Victory dan MV. Lintas Brantas dengan kode (MT) memiliki Volume Pekerjaan (VP) sebesar 20 dibagi Tenaga Kerja (TK) dan Durasi kegiatan (DK), jumlah Tenaga Kerja (TK) 11 Orang dan hasil dari Durasi Kegiatan (DK) yaitu 28 Hari. Hasil dari nilai Volume Pekerjaan (VP) dibagi Tenaga Kerja (TK) dan Durasi Kegiatan (DK) memperoleh hasil PrM dengan nilai 0,06. Dari total pekerjaan perpipaan sangat kurang. Produktivitas tank cleaning mandays (PrM) diketahui hasil perhitungan dari kapal MT. Succes Victory dan MV. Lintas Brantas dengan kode (MT) memiliki Volume Pekerjaan (VP) sebesar 379 dibagi Tenaga Kerja (TK) dan Durasi Kegiatan (DK), jumlah Tenaga Kerja (TK) 5 Orang dan hasil dari Durasi Kegiatan (DK) yaitu 28 Hari. Hasil dari nilai Volume Pekerjaan (VP) dibagi Tenaga Kerja (TK) dan Durasi Kegiatan (DK) memperoleh hasil PrM dengan nilai 2,71. Dari total pekerjaan perpipaan sangat kurang. Tetapkan tujuan dan jadwal yang jelas guna perencanaan seperti kalender atau aplikasi manajemen proyek untuk memantau tenaga kerja. Menetapkan kebijakan yang secara tegas mengatur ketentuan additional works/pekerjaan tambahan agar kapal bisa selesai sesuai dengan waktu yang telah ditentukan. Evaluasi rutin terhadap proses kerja dan sesuaikan jika diperlukan untuk meningkatkan efisiensi. Selalu melakukan pengecekan untuk setiap alat.
Analisa Alat Keselamatan Kapal Roro Passengers Berdasarkan Proses Maintenance, Kuantitas, dan Safety Of Life At Sea (SOLAS) Della Ayu Indarti; Sunu Arsy Pratomo; Anisa Diansisti; Mu’izzaddin Wa’addulloh
Jurnal Sains Bangunan Vol 3 No 1 (2026): Jurnal Sains Bangunan Edisi Maret 2026
Publisher : FAKULTAS TEKNIK ITBADLA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58906/alsaba.v3i1.259

Abstract

Keselamatan pelayaran merupakan aspek fundamental dalam operasional kapal penumpang, khususnya kapal jenis Ro-Ro (Roll-on Roll-off) yang memiliki potensi risiko tinggi terhadap kecelakaan massal. Penelitian ini bertujuan untuk menganalisis prioritas alat keselamatan pada kapal Ro-Ro penumpang KM. Dharma Ferry II berdasarkan tiga kriteria utama, yaitu proses maintenance (perawatan), quantity (jumlah), dan kesesuaian terhadap standar SOLAS (Safety of Life at Sea). Metode yang digunakan dalam penelitian ini adalah Analytical Hierarchy Process (AHP) yang dikembangkan oleh Thomas L. Saaty, yakni metode pengambilan keputusan multi kriteria yang menggabungkan penilaian subjektif dengan perhitungan matematis secara konsisten. Data diperoleh melalui observasi langsung terhadap kondisi alat keselamatan serta dokumentasi teknis kapal. Hasil penelitian menunjukkan bahwa kriteria perawatan memiliki bobot tertinggi sebesar 54%, diikuti oleh kesesuaian SOLAS sebesar 30%, dan kuantitas sebesar 16%. Dari lima jenis alat keselamatan yang dianalisis, lifeboat (sekoci) merupakan alat dengan prioritas tertinggi dengan bobot global sebesar 31%, diikuti oleh Immersion Life Raft (ILR) sebesar 22%, life jacket sebesar 19%, APAR sebesar 16%, dan lifebuoy sebesar 13%. Hasil perhitungan konsistensi untuk tiap matriks perbandingan menunjukkan nilai Concintency Ratio (CR) pada kriteria maintenance sebesar 0,015250719, kuantitas 0,017081, dan SOLAS 0,015251, semuanya berada dibawah batas maksimal 0,1 yang berarti penilaian bersifat konsisten dan dapat dipertanggungjawabkan.
Pengaruh Hasil Pengelasan Listrik dan Asetilin pada Plat Bordes terhadap Kekuatan Tarik, Struktur Mikro, Makro dan NDT (Non Destrutive Testing) Afip Nur Kholis; Sunu Arsy Pratomo; Mu'izzaddin Wa'addulloh; Purwanto Purwanto
Jurnal Universal Technic Vol. 5 No. 1 (2026): Jurnal Universal Technic
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/unitech.v5i1.4159

Abstract

Welding is a metal joining method widely applied in various industrial fields. The quality of welded joints is strongly influenced by the welding method used. This study aims to compare the effect of electric welding and acetylene welding on tread plate in terms of tensile strength, micro-macro structure, and Non-Destructive Testing (NDT) results. The research employed an experimental approach in the laboratory. Tensile testing was conducted to determine yield point and Yield Stress, while macro and microstructural observations were carried out to analyze metallurgical changes. NDT was performed using Magnetic Particle Testing (MPT) and Liquid Penetrant Testing (LPT) to detect possible defects. The results indicate that electric welding produced better joint quality compared to acetylene welding. Specimens welded with electricity showed yield points ranging from 10,045–15,476 N and Yield Stress between 197.663–304.527 MPa, with fewer defects observed. In contrast, acetylene welding produced more varied results with significant defects such as cracks and large porosity, which reduced joint quality. This research demonstrates that electric welding provides superior tensile strength and joint reliability compared to acetylene welding.
Evaluasi Tahanan Isolasi dan Indeks Polarisasi pada Generator Set Diesel 350 kVA Sunu Arsy Pratomo; Lilik Budiyanto
Jurnal Universal Technic Vol. 5 No. 1 (2026): Jurnal Universal Technic
Publisher : Fakultas Teknik Universitas Maritim AMNI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58192/unitech.v5i1.4897

Abstract

The reliability of a Generator Set (Genset) as a backup power supply heavily depends on the integrity of its dielectric insulation system, especially when operating in a tropical coastal environment prone to thermal stress and high humidity. This study aims to evaluate the Insulation Resistance (IR) and Polarization Index (PI) of a 350 kVA generator based on the IEEE 43-2024 standard, and to analyze the conductor resistance balance referring to ANSI/EASA AR100-2025. The research method includes verifying the cooling circulation space, conducting a 1,000 V DC voltage injection test for 10 minutes, and measuring the low-order direct current resistance on the stator windings. Evaluation results show that the insulation resistance values on the stator, power cables, and circuit breaker exceed the instrument's limit (>1,000 MΩ), indicating minimal leakage current and excellent insulation condition. The Polarization Index (PI) value was recorded at a ratio of 2.0 (categorized as Good). A maximum resistance asymmetry deviation of 4.35% was found in the T-R phase, which still meets the operational tolerance limit. It is concluded that the generator unit is in a highly feasible operating condition. As a preventive measure in coastal areas, operating the internal space heater while the unit is on standby is recommended to prevent the accumulation of microscopic condensation.
Analisa Load Factor, Overloading Muatan Truk dan Stabilitas Pada Kapal RORO di Pelabuhan Tanjung Perak Surabaya Randica Devans Davista; Sutini; Sunu Arsy Pratomo
Jurnal Sains Bangunan Vol 3 No 2 (2026): Jurnal Sains Bangunan Edisi September 2026
Publisher : FAKULTAS TEKNIK ITBADLA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58906/alsaba.v3i2.393

Abstract

Kapal RORO (Roll-On/Roll-Off) adalah jenis kapal yang dirancang untuk mengangkut kendaraan dan kargo lainnya dengan cara roll-on dan roll-off. Kapal ini memiliki rampdoor yang memungkinkan kendaraan dan kargo lainnya untuk dimuat dan dibongkar dengan mudah. Dengan kemampuan mengangkut kendaraan dan kargo dalam jumlah besar, kapal RORO memainkan peran penting dalam meningkatkan efisiensi dan efektifitas transportasi laut. Penelitian ini membahas tentang desain, operasional, dan manfaat kapal RORO dalam meningkatkan keselamatan dan efisiensi transportasi laut. Overloading truk dapat menyebabkan kerusakan pada rampdoor kapal dan mempengaruhi keselamatan operasional kapal. Penelitian ini membahas tentang dampak overloading truk terhadap rampdoor kapal, termasuk analisis kekuatan struktur rampdoor dan simulasi kegagalan struktur akibat overloading. Hasil penelitian ini menunjukkan bahwa overloading truk dapat menyebabkan kerusakan pada rampdoor kapal dan mempengaruhi keselamatan operasional kapal. Oleh karena itu, penelitian ini merekomendasikan penggunaan sistem pengawasan beban untuk mencegah overloading truk dan memastikan keselamatan operasional kapal. Load factor kapasitas kapal adalah parameter penting yang digunakan untuk menentukan kemampuan kapal dalam mengangkut kargo dan penumpang. Load factor yang tepat dapat memastikan keselamatan dan efisiensi operasional kapal. Penelitian ini membahas tentang konsep load factor kapasitas kapal, metode perhitungan, dan faktor-faktor yang mempengaruhi load factor. Hasil penelitian ini dapat digunakan sebagai referensi untuk meningkatkan keselamatan dan efisiensi operasional kapal. Stabilitas kapal adalah kemampuan kapal untuk mempertahankan keseimbangan dan menghindari terbalik atau tenggelam. Faktor-faktor seperti desain kapal, beban kargo, kondisi laut, dan operasional kapal dapat mempengaruhi stabilitas kapal.
Evaluasi Keandalan Struktural dan Margin Keselamatan Getaran Mekanis pada Generator Set Diesel 350 kVA Sunu Arsy Pratomo; Annisa Diansisti
Jurnal Teknik Mesin, Industri, Elektro dan Informatika Vol. 5 No. 2 (2026): Jurnal Teknik Mesin, Industri, Elektro dan Informatika
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jtmei.v5i2.6130

Abstract

Mechanical vibration in diesel generator sets is a critical parameter that must be precisely evaluated to ensure reliability and prevent unexpected operational failures. This study aims to analyze the dynamic characteristics of structural vibration in a 350 kVA (1500 RPM) generator set based on the ISO 8528-9 international standard. The applied method was a quantitative observational approach under steady-state operational conditions. Data collection was conducted by directly measuring the Root Mean Square (RMS) velocity at eight main chassis mounting points in both horizontal and vertical orientations. The structural reliability level was then analytically calculated using the Danger Ratio and Margin of Safety percentage formulations. Field test results indicated that the highest vibration load distribution accumulated on the horizontal axis, with a peak amplitude surge reaching 14.6 mm/s at the front right quadrant of the alternator chassis. Based on mathematical calculations, this extreme point generated a danger ratio of 58.40%. Despite enduring the highest load, the mounting structure proved to be stable by maintaining a safety margin of 41.60%. Comprehensively, all sixteen validated amplitude measurements were well below the maximum operational tolerance limit of 25 mm/s. Therefore, it can be concluded that this generator set installation mechanically fulfills the technical feasibility requirements and is declared highly reliable for continuous operation.
Analisa Kelaikan Operasi Generator Set Diesel 350 kVA Berbasis ISO 8528-5:2025 Sunu Arsy Pratomo; Mu’izzaddin Wa’adulloh
Jurnal Teknik Mesin, Industri, Elektro dan Informatika Vol. 5 No. 1 (2026): Jurnal Teknik Mesin, Industri, Elektro dan Informatika
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jtmei.v5i1.6136

Abstract

The stability of electrical parameters in a generator set (genset) under high load conditions is a primary indicator of the reliability of a backup power supply system. This study aims to analyze the operational feasibility of a 350 kVA (280 kW) diesel genset unit with specific reference to the performance criteria established by ISO 8528-5:2025. The methodology employed in this research is a quantitative experimental design using a field observation approach through step-load bank testing. The measurement results indicate that the unit meets the G3 performance class criteria, characterized by exceptional frequency stability within the 49.98–50.02 Hz range (maximum deviation of ±0.02 Hz) under stable operating conditions. Capacity testing demonstrated the ability to sustain a peak load of 205.3 kW (84% of active capacity), confirming the system's capability to maintain voltage regulation at 388 V with a deviation of only -3% from the nominal value of 400 V. Current unbalance analysis showed a linear correlation, where the unbalance value decreased drastically from 10.87% at low loads to below 1% at optimal loads. This study concludes that the generator unit exhibits highly reliable and responsive performance in supporting critical facility loads in compliance with international standards.
Penambahan Berat Sic Pada Komposit Matrik Aluminium Dalam Sifat Fisis Dan Mekanis Diperkuat Tib Sebagai Penghalus Butir Lilin Hermawati; Sunu Arsy Pratomo; Sugeng Hariyadi
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 2 No. 2 (2023): Mei : Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v2i2.1968

Abstract

Aluminum is an excellent material for making composites because it is lightweight, ductile, does not corrode easily and is easier to shape and fabricate. Various properties of existing aluminum, aluminum has mechanical properties that are not good, namely very low hardness. In a good method for processing aluminum, namely stir casting, why is this method used because it is quite cheap and easy to process by means of an alloy that is heated with an adjusted heat and stirred to mix all the existing composite materials and given reinforcement or grain refiner to obtain a good and evenly distributed composite metric without reducing the function of the existing composite. The method used in this study serves to improve the mechanical properties of a metal and SiC is used as a reinforcement and TiB is used as a grain refiner. SiC has advantages over other ceramic materials, namely it bonds easily with aluminum and does not cause oxidation of aluminum metal. Increasing the wetability of metal alloys with reinforcement, the technique used is by stirring when the liquid metal is in a semisolid phase. This research focused on variations in weight percent SiC powder 0%, 5%, 7.5%, and 10% and the addition of 5% Tib. To determine the physical and mechanical properties of the Al-SiC-TiB composite, several tests were carried out, namely density, porosity, hardness, bending and microstructure tests. The results of the tests showed that the highest density value was found at 0% SiC by weight at 2.70 gr/cm3, the lowest at 10% SiC at 2.65 gr/cm3. Porosity calculations show that the highest porosity value is found in 10% SiC by weight of 3.16%. The highest hardness test result was 10% SiC by weight at 72.6 HRB and the bending test result with the highest hardness value at 10% SiC by weight was 371.5 MPa. The test results show that the mechanical properties increase with the increase in the percentage of SiC powder up to 10% and with the addition of TiB the finer grains are produced so that the porosity decreases.
Co-Authors Abimanto, Dhanan Afip Nur Kholis Anisa Diansisti Annisa Diansisti Bayu Galih Prakoso Bayu Murti Bunga Dwi Sukmawati Dedy Rusmiyanto Della Ayu Indarti Lilik Budiyanto Lilin Hermawati Lilin Hermawati Mu'izzaddin Wa'addulloh Muhammad Andhara Alam Pasha Muhammad Rizki Kurniawan Muhtar Lutfi Mui’zzaddin Wa’adulloh Mu’izzaddin Wa’addulloh Mu’izzaddin Wa’adulloh Purwanto Putro Ponco Jalu Manunggal Rafdi Ma’ruf Satria Rahma Putri Tiara Randica Devans Davista Regius Ovianto Purba Sugeng Haryadi Sutini Zihni Ihkamuddin