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All Journal Jurnal Simetris Marine Science and Technology Journal Journal of Vocational Education and Automotive Technology JHT: Journal of Hospitality and Tourism Jornal Of Tourism Sciences (Toursci) UTAMA: Jurnal Pariwisata Prima
Wibowo, Riyanto
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Journal : Marine Science and Technology Journal

 1 
Perhitungan Beban Pendinginan pada Ruang Akomodasi Kapal General Cargo KM Pratiwi 2055 DWT Suyanto, Suyanto; Wibowo, Riyanto
Marine Science and Technology Journal Vol 5 No 1 (2024): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v1i1.3084

Abstract

The use of HVAC on ships is very necessary considering that the environmental conditions are relatively hot when the ship is operated, so to provide comfort to the ship's crew it is necessary to ensure that the temperature and humidity of the ship's accommodation spaces are maintained. One of the main problems in HVAC planning is determining the right cooling machine capacity, so that the cooling goal of providing cool and comfortable air conditions can be achieved. The selection of cooling engine capacity is chosen based on the total cooling load on the ship. The cooling load calculation is carried out using equations and calculation steps in accordance with ISO 7547 of 2002. The existing heat load sources are the total of the transmission heat load that propagates through the walls, ceiling and floor of the room, the heat load from the room occupants, the radiation heat load that passes through the room. walls, heat load from room lighting, and heat load from electronic equipment used in the room. Calculation of the cooling load for the accommodation space of the General Cargo KM Pratiwi 2055 DWT ship identified transmission heat of 3528 Watts, room occupant heat of 9910 Watts, radiant heat through the walls of 3700 Watts, room lighting heat of 1340 Watts, and heat load from equipment electronics of 5900 Watts. The total cooling load from the cooling machine is 24,378 Watts.
Studi Literatur Pengaruh Kuat Arus, Waktu Perendaman, Dan Suhu Terhadap Hasil Elektroplating Suyanto, Suyanto; Wibowo, Riyanto
Marine Science and Technology Journal Vol 5 No 2 (2024): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v1i2.3285

Abstract

Currently, electroplating is widely used in the metal industry for various purposes, including improving the appearance and also preventing corrosion. Besides that, the mechanical properties of materials such as strength and hardness are also affected so that they will increase. The electroplating process is a process for coating metal by dipping the material to be coated into an electrolyte solution that carries a direct electric current to the dipped electrode. The materials coated in the electroplating process are usually low and medium carbon steel. The coating materials that are often used are nickel, chrome, zinc and copper. Electroplating process variables greatly influence the results achieved. In this article, we will discuss the influence of current strength, immersion time, and temperature of the electrolyte solution on the results of the electroplating process. The properties of electroplating results discussed are layer thickness, corrosion resistance, and hardness.
Analisa Perhitungan Tebal Pipa Kapal Tanker Berdaya Mesin 1500 BPH Pramono, Sri; Wibowo, Riyanto
Marine Science and Technology Journal Vol 6 No 1 (2025): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v2i1.3678

Abstract

Galangan kapal baja di tahun 2016 mengalami peningkatan produksi kapal yang sangat signifikan. Hal ini untuk mendukung program Tol Laut pemerintah yang ingin mempermudah pendistribusian logistik antar pulau. Dengan demikian maka produktifitas galangan kapal perlu ditingkatkan agar dapat menyelesaikan pembangunan kapal baru tepat waktu. Dalam pembangunan kapal bangunan baru terdapat 6 (enam) pokok kegiatan yaitu design, fabrication, assembly, erection, outfitting, and launching. Outfitting merupakan proses pemasangan komponen kapal, meliputi hull outfitting, piping and electrical installation, accomodation, machinery outfitting, dan sistem propulsi. Dimulainya fabrikasi sistem perpipaan setelah tahap penyambungan antar block/erection selesai. Setiap pembangunan kapal harus memiliki sistem perpipaan, di karenakan pipa merupakan jantung dari kapal. Sistem perpipaan adalah bagian utama suatu sistem yang menghubungkan titik dimana fluida disimpan ke titik pengeluaran semua pipa baik untuk memindahkan tenaga atau pemompaan harus dipertimbangkan secara teliti. Karena keamanan dari sebuah kapal salah satunya tergantung pada susunan perpipaan. Untuk mengetahui bahwasanya pipa itu berfungsi dengan baik terlebih dahulu kita harus melakukan pengujian pipa sebelum kapal beroperasi. Pengujian itu terdiri dari pengujian hydrotest pressure yang di lakukan setelah instalasi pipa terpasang dengan benar. Pengujian ini dilakukan sebelum kapal diluncurkan ke dalam air. Sedangkan pengujian function test yang di lakukan saat kapal sudah berada di air. Pengujian ini dilakukan agar kita tahu apakah pipa itu berfungsi dengan baik, serta untuk mengetahui terdapat kebocoran pipa maupun pada instalasi.
Analisa Penentuan Tipe Dan Ukuran Impeller Pompa Sentrifugal Single Stage Berdaya 15 KW 30 A Pramono, Sri; Wibowo, Riyanto; Prayoga, Danu
Marine Science and Technology Journal Vol 6 No 2 (2025): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v2i2.4051

Abstract

Pompa sentrifugal merupakan salah satu jenis pompa yang paling umum digunakan dalam berbagai sektor industri maupun transportasi laut untuk memindahkan fluida. Kinerja pompa sangat dipengaruhi oleh desain dan spesifikasi impeller, yang berfungsi sebagai komponen utama dalam proses perpindahan energi dari motor ke fluida. Penelitian ini bertujuan untuk menganalisis dan menentukan tipe serta ukuran impeller yang optimal untuk pompa sentrifugal single stage dengan daya motor 15 kW dan arus 30 A. Metode yang digunakan meliputi perhitungan teoritis berdasarkan rumus-rumus fluida dinamis, analisis karakteristik pompa, dan pertimbangan efisiensi hidrolik. Hasil analisis menunjukkan bahwa pemilihan tipe impeller (closed, semi-open, atau open) sangat bergantung pada sifat fluida yang dipompa serta kebutuhan head dan flow rate. Ukuran impeller yang optimal ditemukan mampu memberikan efisiensi maksimum dengan mempertimbangkan batas daya input motor serta karakteristik sistem pemipaan. Dengan penentuan tipe dan ukuran impeller yang tepat, diharapkan kinerja sistem pompa menjadi lebih efisien dan andal dalam jangka panjang.
Perhitungan Gaya-Gaya yang Bekerja pada Rantai Jangkar KM. Naga Sejahtera III Wibowo, Riyanto; Sugiantoro, Wasis
Marine Science and Technology Journal Vol 3 No 2 (2022): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v2i2.2040

Abstract

Indonesia is a maritime country because most of its territory is surrounded by oceans. This geographical location makes Indonesia need a reliable sea transportation model. One of the sea transportation models used is the ship. Anchor is one of the components in the ship. Ship anchors in general usually consist of chains and ballast. The role of the anchor on the ship is very vital, especially when the ship is anchored. This study aims to calculate the forces acting on the KM anchor chain. Prosperous Dragon III. The results showed that the tensile stress on the anchor chain of Naga Sejahtera III was 161.35 kg/cm2 and on the right chain 138.71 kg/cm2. The bending moment acting on the Naga Sejahtera III ship on the commonlink is 4.33 kg/cm2 , at the endlargelink and endlink is 5 kg/cm2 . The shear stress acting on the anchor chain on the left of the Naga Sejahtera III ship is 80.67 kg/cm2 and on the right chain is 69.35 kg/cm2.
Pembuatan Alat Peraga Hydrophore Tank 3 Belokan 1 Katup Pipa 0,75 Inchi Wibowo, Riyanto; Hariningrum, Rita
Marine Science and Technology Journal Vol 4 No 1 (2023): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v3i2.2513

Abstract

Fresh water is an important requirement in fixed or moving structures such as ships. One way to provide fresh water is through a hydrophore system. Hydrophore was chosen as an alternative to public water tower systems because water towers were considered less aesthetically pleasing. Another consideration is that every part of the ship should be taken care of so that it does not interfere with the performance of the ship. The ship chose the hydrophore system because this system is dimensionally more practical when compared to a water tower. The installation of a water basin on a ship must take into account the number of turns and valves in the outlet pipe. A hydrophore simulation tool with many bends and valves is required to predict the adequacy of water demand on board. This research was conducted to determine the conditions and obtain the specifications from the hydrophore system. The support created consists of 3 turns and 1 valve. The bus emission specification is 9x10-3 m3 with an inlet pipe flow rate of 391x10-6 m3/s and an outlet pipe flow rate of 343282x10-3 m3/s. Major head loss is 21x10-3 m and minor head is 0.7 m.
Pemanfaatan Besi Scrap Sebagai Bahan Dasar Industri Peleburan Baja Suyanto, Suyanto; Wibowo, Riyanto; Pramono, Sri
Marine Science and Technology Journal Vol 2 No 2 (2021): Marine Science and Technology Journal
Publisher : Universitas Ivet

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/maristec.v1i2.1557

Abstract

Many steel industries use scrap material as their basic material, both in the machine industry and the metal industry. The reason for using scrap is because this material is easy to obtain, has a high comparative value, has a chemical composition that is still very possible for further processing, and can reduce problems related to metal waste. Scrap material has a non-uniform type and chemical composition. The mistake in determining the type and composition of the basic ingredients will risk producing products whose specifications are not as expected. For that, before scrap is processed, it must first be grouped according to its type, then it is necessary to know in advance the chemical composition of each type of scrap ferrous material. Calculation of material composition before smelting must be precise, referring to the chemical composition standard that becomes the reference. The production of scrap iron into concrete reinforcing steel at PT Abadi Jaya Manunggal shows that scrap iron can be recycled and processed to produce reinforcing steel for concrete by taking into account the correct scrap composition. The chemical composition test results of scrap iron smelting show a composition identical to that of grade 250 steel. The result of the calculation of carbon equivalent is 0.317%, lower than the required maximum limit of 0.6%.
Co-Authors Aji, Moh Ibnu Sapto Bayu Ariwibowo Dian Fitriyana, Dian Hariningrum, Rita Joseph Aldo Irawan Kurniawan, Ratna Dwi Mustafa, Iva Yulia Pramono, Sri Prayoga, Danu Puarag, Peri Ratna Puspita Dewi, Ratna Puspita Sena Mahendra Sugiantoro, Wasis Suyanto Suyanto Wibowo, Toni Ari Widia Ningsih, Widia