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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS Jurnal Sains dan Seni ITS Rekayasa Mesin Wave: Jurnal Ilmiah Teknologi Maritim Ge-STRAM: Jurnal Perencanaan dan Rekayasa Sipil Journal of Marine-Earth Science and Technology Sewagati
Heri Supomo
Institut Teknologi Sepuluh Nopember
Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Public Health Social Sciences Transportation Other

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Analisis Kapasitas Galangan Kapal Ikan Untuk Memenuhi Rencana Pengadaan Kapal Ikan Hibah Agus Lubis Fitriansyah; Heri Supomo
Wave: Jurnal Ilmiah Teknologi Maritim Vol. 13 No. 1 (2019)
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jurnalwave.v13i1.3583

Abstract

The government through the Ministry of Marine and Fisheries offers assistance of fishing vessel to achieve fisheries production targets. This procurement plan must be supported by the ability and selection of the right shipyard. Beacuse the information of the capability and capacity of fiber shipyards in Indonesia is unclear, so the realization of the procurement of fishing vessel in previous years did not met the planned targets. The purpose of this study was to analyze shipyard capacity to meet the planned procurement of KKP fishing vessels grant in 2019. First classification of fishing vessels is based on the size of each GT, which is <5 GT (type 1), 5-10 GT (type 2), and 20-30 GT (type 3). The second is the minimum shipyard criteria for building fishing boats. Third, an assessment of the shipyard is based on the criteria that have been made. Fourth, shipyard selection was carried out on each WPPN-RI using the load score method. The fifth calculates the number of ships that can be built by the shipyard. The results of the shipyard assessment found that 43% of shipyards have the ability to build type 1 vessels, around 38% of shipyards have the ability to build type 2 vessels, and around 19% of shipyards have the ability to build type 3 vessels. is 1625 units / period. Referring to shipyard capacity, it can be said that the entire shipyard is able to fulfill the plan to procure assistance for KKP fishing vessels in the 2019 budget year.
Studi Pemodelan Harga Kapal Tanker Bekas Dengan Metode Statistik Heri Supomo; Imam Baihaqi
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 16, No 1 (2019): Februari
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1210.193 KB) | DOI: 10.14710/kapal.v16i1.22442

Abstract

Salah satu alasan pemodal membeli kapal tanker bekas adalah karena lamanya waktu pembangunan dan tingginya biaya investasi untuk membangun sebuah kapal baru. Namun demikian terkait dengan harga kapal tanker bekas, saat ini masih belum ada metode yang tepat untuk memprediksi nilainya. Multi-faktor seperti: tahun pembuatan, kapasitas kapal, negara asal pembuat, dan operasional kapal menjadikan proses memprediksi harga kapal ini menjadi lebih kompleks dibandingkan single-faktor. Kompleksitas tersebut membuat penentuan harga kapal tanker bekas pula menjadi berbeda-beda antar penilai. Estimasi harga kapal bekas yang kurang tepat dapat merugikan perusahaan jika harga beli lebih mahal dari nilai kapal bekas sesungguhnya. Tujuan dari paper ini adalah membuat pemodelan statistik untuk memprediksi harga kapal tanker bekas agar mendekati harga semestinya. Pemodelan dibuat secara simultan dengan mempertimbangkan faktor kualitatif meliputi usia kapal dan ukuran DWT dan faktor kuantitatif dimana mengacu pada galangan pembuat, klas dan negara asal pembuat kapal. Data kapal yang terkumpul, yang diperoleh dari data pusat broker kapal internasional secara online, kemudian dianalisa secara statistik dengan melakukan regresi secara multikolinearitas. Data-data ini kemudian diuji secara statistik antara lain yaitu: uji serentak, uji individu, uji asumsi normalitas, uji asumsi heteroscedasticity, dan penentuan koefisien determinasi. Korelasi kuadratik didapatkan antara umur dengan harga kapal, sedangkan umur dengan DWT berhubungan secara logaritmik. Kedua korelasi ini kemudian disimultankan dan didapatkan model secara statistik berdasarkan lima kelompok negara asal pembuat (Eropa (beberapa negara), Jepang, Korea, China, dan Asia Tenggara (beberapa negara termasuk Indonesia)). Jika kelompok Asia Tenggara dijadikan acuan, maka pada kelas Minibulker kelompok Eropa dan Jepang jauh lebih mahal sekitar 40% disusul Korea 21,0% dan China hanya 0,5% lebih mahal. Pada kelas Handysize, selisih harga untuk kelompok Eropa adalah 13,7% lebih mahal, disusul Korea sebesar 7,2%; sebaliknya, selisih harga di Jepang dan China lebih murah 4,9% dan 5,9%.
Analisa Teknis Sambungan Butt-Joint pada Konstruksi Badan Kapal Pasca Terbakar dengan Material Baru berbasis Pendekatan Eksperimen Imam Baihaqi; Heri Supomo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 15, No 2 (2018): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1140.38 KB) | DOI: 10.14710/kpl.v15i2.17534

Abstract

Kebakaran pada kapal dapat merusak karakteristik mekanik dan susunan kristal material baja kapal. Perambatan panas akibat api yang membara pada kapal dapat mencapai suhu sampai dengan 800°C -1000°C. Tujuan dari penulisan paper ini adalah untuk menginvestigasi kekuatan sambungan las butt-joint pada material baja kapal pasca terbakar yang disambung dengan material baja baru. Uji tarik sambungan las dilakukan untuk menentukan kekuatan tarik puncak (ultimate) dan kekuatan luluh (yield) serta regangan, sedangkan uji bending (face bend dan root bend) dilakukan untuk mengetahui kualitas sambungan las secara visual. Kondisi pelat terbakar disimulasikan dengan membakar pelat kapal sesuai dengan standard ISO 834 dengan berbagai variasi suhu bakar mulai dari 200°C sampai dengan 1000°C. Patahan hasil uji tarik berada di basemetal pada semua variasi dengan nilai kekuatan tarik puncak di atas 430 MPa (di atas nilai raw material basemetal). Pada variasi suhu 300°C s.d 650°C patahan hasil uji tarik berada pada baja pasca terbakar, sedangkan pada variasi suhu 700°C s.d. 1000°C patahan berada pada material baja baru. Sedangkan hasil uji bending menunjukkan secara visual tidak terdapat bukaan atau cacat pada hasil uji pada semua variasi. Nilai regangan sambungan las mengalami penurunan sebesar >10% pada suhu 700°C sampai dengan 1000°C. 
Analysis of Material Supplier Selection in Laminated Bamboo Shipyards Using the Analytical Hierarchy Process Method Abdul Rachman Safarudin; Heri Supomo; Wikaranosa Scotiandharu Supomo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49449

Abstract

The material supply chain is an essential part of the shipbuilding industry. For this reason, it is necessary to select suppliers who can support the material needs of ship production. Qualitative and quantitative factors are multi-criteria problems in supplier selection. The Analytical Hierarchy Process (AHP) method effectively determines an integrative approach to supplier selection. This research is applied to a laminated bamboo shipyard to evaluate several companies that can be used as material suppliers. The analysis was carried out using expert choice software by calculating the weight of each criterion and sub-criteria. The analysis results obtained the priority of the primary material supplier with the Kediri area (S1) as the supplier of bamboo material for ship construction with a global weighting value of 0.363. PT. An (S5) located in the Surabaya area is the next top priority as a supplier of adhesive and finishing 1st material components with global weighting values of 0.434 and 0.427, respectively. PT. E (S9) is located in the Semarang area as a priority supplier of finishing 2nd material components with a global weighting value of 0.490. UD. G (S11) is located in the Surabaya area as a priority supplier of ship mold components with a global weighting value of 0.456. In addition, UD. J (S14), located in the Surabaya area, is a priority supplier of material components for clamps, sanding, and cutting blades with a global weighting value of 0.496 and 0.351.
Sosialisasi dan Pembagian Masker pada Masyarakat Nelayan Pesisir untuk Mencegah Penyebaran COVID-19 Sufian Imam Wahidi; Triwilaswandio Wuruk Pribadi; Heri Supomo; Sri Rejeki Wahyu Pribadi; Mohammad Sholikhan Arif; Danu Utama
Sewagati Vol 5 No 3 (2021)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (556.1 KB) | DOI: 10.12962/j26139960.v5i3.30

Abstract

COVID-19 adalah penyakit menular yang disebabkan oleh jenis corona virus yang baru ditemukan. Ini merupakan virus baru dan penyakit yang sebelumnya tidak dikenal sebelum terjadi wabah di Wuhan, Tiongkok, bulan Desember 2019. Gejala-gejala COVID-19 yang paling umum adalah demam, rasa lelah, dan batuk kering. COVID19 dapat menyebar dari orang ke orang melalui percikan-percikan dari hidung atau mulut yang keluar saat orang yang terjangkit COVID-19 batuk atau mengeluarkan napas, percikan-percikan ini kemudian jatuh ke benda-benda dan permukaanpermukaan di sekitar. Bagi orang yang menyentuh benda atau permukaan tersebut lalu menyentuh mata, hidung atau mulutnya, dapat terjangkit COVID-19. Oleh karena itu dilakukanlah sosialisasi dan penyuluhan masyarakat nelayan pesisir dalam menghadapi dan mencegah penyebaran COVID-19 di daerah pesisir nelayan serta pembagian masker kepada masyarakat nelayan pesisir. Sehingga dapat meningkatkan kesadaran masyarakat akan bahayanya penyakit yang disebakan oleh COVID 19, kondisi penyebaran COVID-19 di Indonesia, serta prosedur dan protokol kesehatan dalam rangka menerapkan social distancing. Kegiatan pengabdian masyarakat terlaksana di Pelabuhan Perikanan Pantai Mayangan, Kel. Mangunharjo Kec. Mayangan, Kota Probolinggo, Jawa Timur. Karena Pelabuhan ini dikelilingi oleh banyak pasar dan pelabuhan ini juga berisikan galangan–galangan kapal serta Tempat Pelelangan Ikan (TPI). Kegiatan berjalan dengan lancar diimbangi dengan tingkat antusias masyarakat yang tinggi. Tingkat keberhasilan dari kegiatan pengabdian masyarakat ini dapat dilihat dari meningkatnya kepedulian masyarakat nelayan pesisir akan pentingnya protokol kesehatan. Hal tersebut ditandai dengan meningkatnya jumlah masyarakat nelayan yang menggunakan masker saat melakukan aktifitas.
SIMULASI NUMERIK DESAIN CRADDLE DECK DERMAGA KAPAL 150 GT Mohammad Sholikhan Arif; Heri Supomo; Triwilaswandio W. Pribadi; Sufian Imam Wahidi; Rizky Chandra Ariesta; Sri Rejeki Wahyu Pribadi
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1111

Abstract

Cradle is a lifting tool used to transport ships. The innovation of the cradle design as a deck tool for transporting ships to the dock is a breakthrough to simplify the transportation process. Of course, in the design process, a method is needed to get a design that meets the standard. Numerical simulation is a method that is applied to determine the stress that occurs in the cradle when it is subjected to a load. The workload is a ship transported with the assumption that the load is evenly distributed along with the cradle. The design acceptance criteria were chosen based on the ability of the cradle structure to withstand axial and transverse loads. The standard code as a reference uses the allowable stress criteria from the Indonesian Classification Bureau (BKI) in each local stress. Based on the simulation results, it is found that the sluggishness of the planned cradle design is able to withstand the workload so that the cradle design is feasible to be applied to the operational process.  
Design, Construction And Operational Plans Of An Electric Paddle Wheel For A Laminated Bamboo Slats River Cruise Boat Heri Supomo; Eko Budi Djatmiko; Setyo Nugroho; Wikaranosa Scotiandharu Supomo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 2 (2023): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i2.50503

Abstract

River cruise tourism in Indonesia has a moderately high potential as there are so many rivers in Indonesia that offer beautiful natural and urban views. However, majority of river cruiser boats still use outboard engines, both two-stroke and four-stroke combustion engines. The working system of the outboard engine is to carry out the combustion process of the fuel oil. This combustion process usually has a loud sound, leading to noise pollutants that can harm the environment and make passengers uncomfortable. Burning fossil fuels also causes the residual compounds that increases environmental pollution, especially carbon emissions. In this paper, an analysis will be carried out on the operational costs of a river cruise ship with electric paddle wheel propulsion. With a boat design with an LOA size of 5.4 m, breadth of 1.4 m, height of 0.8 m, draft of 0.3 m, and CB of 0.68, the paddle wheel diameter is 70 cm, blade width of 30cm, and 6 blades. The motor used to drive the paddle wheel has a power of 672.69 watts, with a battery capacity of 100 Ah. According to operational planning, benefits will be obtained, including zero carbon emissions, no noise and operational benefits can be up to 90% greater when compared to the out-board engine drive.
Pelatihan Assessment dan Maintenance Floating Dock Berbasis Keandalan Baihaqi, Imam; Pribadi, Triwilaswandio Wuruk; Supomo, Heri; Pribadi, Sri Rejeki Wahyu
Sewagati Vol 9 No 2 (2025)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v9i2.2443

Abstract

Floating dock merupakan salah satu fasilitas utama galangan, berfungsi untuk menaikkan dan menurunkan kapal, khususnya pada proses reparasi. Sarana ini memiliki beberapa bagian utama seperti pontoon, wing-wall, pompa-pompa utama, dan sistem perpipaan. Artikel ini bertujuan untuk memaparkan proses dan hasil pelatihan assessment dan memelihara floating dock dengan pendekatan keandala, yang ditujukan kepada staf dan manajer galangan kapal di PT Dok dan Perkapalan Surabaya (DPS). Kegiatan awal yang dilakukan adalah melakukan assessment kondisi floating dock dan mengidentifikasi jenis-jenis kerusakan yang terjadi. Hasil assessment tersebut kemudian dijadikan case study dalam menerapkan strategi pemeliharaan dengan pendekatan keandalan untuk dibuat materi pelatihan dipadukan dengan teori keandalan. Setelah materi dipresentasikan oleh tim ITS kepada peserta dilanjutkan diskusi dan tanya jawab, didapatkan bahwa konsep keandalan pada bidang maritim dapat diterapkan pada sarana floating dock, namun, metode ini akan lebih sesuai diterapkan pada floating dock yang baru. Proses tukar pikiran antara pemateri dan peserta juga memberikan tambahan pengayaan dari pemateri, khususnya kondisi floating dock dalam kondisi kerusakan berat.
Post-Fire Ship Hull Repair Method Considering Corrosion Rate and Mechanical Properties Baihaqi, Imam; Supomo, Heri
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.71686

Abstract

Ship accidents due to fire will result in several consequences, especially concerning the structure of the ship. The very high temperature of the ship fire will greatly affect the mechanical properties and corrosion resistance of the ship's construction materials after the fire. This study will investigate the relationship between mechanical properties and corrosion resistance of materials to the temperature that occurs during the fire. The mechanical properties are examined by testing the tensile strength of the material after the fire. As for corrosion resistance, corrosion speed testing will be carried out using the 3-electrode cell method. The experimental temperature variations used are 300°C, 500°C, 600°C, 700°C, and 900°C. Based on the results of the study, it can be concluded that the higher the fire temperature, the mechanical properties also increase. This increase in tensile strength reaches a culmination point at a temperature of 600°C and then tends to decrease with increasing fire temperature. As for the corrosion speed, the change phenomenon is also almost the same pattern. The higher the temperature of the ship fire, the corrosion speed will increase significantly. The increase in the corrosion rate value in post-burn ship materials will continue to increase. So based on the experiment, it can be concluded that post-burning material can still be refurbished if the temperature is <600°C, with a tensile strength of 445 MPa and a corrosion rate of 0.5 mmpy.
Techno-economic Study of Recycled Plastic Waste Boards (RPB) as Sustainable Shell Construction Material for Fishing Vessels in Indonesia Supomo, Heri; Baihaqi, Imam; Safaruddin, Abdul Rahman; Supomo, Wikaranosa
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 2 (2025): June
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i2.68193

Abstract

The extreme increase in plastic waste over the past few decades has significantly impacted environmental challenges, especially in marine ecosystems. Despite numerous attempts, the use of recycled plastic waste remains restricted to specific applications. This paper experimentally investigates the potential of using Recycled Plastic-Waste Boards (RPB) as a shell hull construction material for fishing vessels in Indonesia. The study technically investigated the performance of RPB works compared to regular materials like wood and fiberglass-reinforced plastic (FRP) for fishing vessels in terms of mechanical properties, and it's cost-effective. The RPB was made from mixed plastic waste, which was collected, chopped into small pieces, and then heated using a special design heating pot which then poured into special mold. The RPB was then mechanically tested using the ASTM D638 standard for tensile strength and the ASTM D790 standard for flexural strength. The results indicate that the RPB’s tensile and flexural strength are 9.4 MPa and 17.22 MPa, respectively, which meets the required mechanical strength standards for marine applications. In addition, the economic analysis shows that using RPB material can lower the construction costs of a 4-GT-sized boat shell hull by 57.79% and 17.09% compared with wood and FRP materials. Based on technical and economic views, the RPB materials have potential as alternative materials for boat shell construction and are more economical. These findings suggest that RPB provides a sustainable alternative to conventional materials and promotes the development of a circular economy within Indonesia's fishing sector. Overall, this research highlights the potential of RPB to contribute to both environmental sustainability and economic feasibility in the construction of small fishing vessels.
Co-Authors Abdul Rachman Safarudin Aditya, Bagus Kusuma Afif Wiludin Agus Lubis Fitriansyah Agus Lubis Fitriansyah Ainun Kunti Zahra Andika Prabowo Apri Malani Putri Baihaqi, Imam Bambang Kristanto Eko Budi Djatmiko Fitriansyah, Agus Lubis Gita Anggaretno Hutabarat , Darryl Oliver Benedict I Ketut Suada Imam Baihaqi M. Rafee Revaldi Marcell Ma'ruf, Buana Mohammad Sholikhan Arif Mohammad Sholikhan Arif Mohammad Sholikhan Arif Mohammad Sholikhan Arif, Mohammad Sholikhan Muhammad Wildan Firdaus Ni'mah, Lilik Hidayatun Nurul Hidayati Permana, Rizki Dian Ridho Prianggoro Rizky Armanda Rizky Chandra Ariesta Rizqi Dian Permana Rochani, Imam Safaruddin, Abdul Rahman Setyo Nugroho Sri Rejeki Wahyu Pribadi Sri Rejeki Wahyu Pribadi Sufian Imam Wahidi Supomo, Wikaranosa Triwilaswandio W. Pribadi Triwilaswandio Wuruk Pribadi Utama, Danu Wahidi, Sufian Imam Wikaranosa Scotiandharu Supomo Wikaranosa Scotiandharu Supomo