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All Journal Jurnal Teknologi Maritim Proceedings Conference on Marine Engineering and its Application
Benedicta Dian Alfanda
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Mechanical Engineering

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PERENCANAAN PERAWATAN IMPELLER DAN SHAFT FRESH WATER PUMP DENGAN METODE PREDICTIVE MAINTENANCE Ahmad Muzzammil; Nurvita Arumsari; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 3 No 1 (2020): Conference on Marine Engineering and its Application
Publisher : Politeknik Perkapalan Negeri Surabaya

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

Abstract

A maritime transportation based company used corrective maintenance on these two component,impeller and shaft of fresh water pump inside their ship’s water cooling system. While using correctivemaintenance, these two components are getting maintained when its already in worse condition and made thesystem down. Therefore, a reliability analysis is performed using predictive method to predict when will these twocomponent would break down and then scheduled to fix based on MTTF value of component. Then, the systemwould run without getting disrupted because of the unit’s downtime.
ANALISIS KELELAHAN NEW PROPELLER KAPLAN K4-70 SERIES PADA KAPAL TUGBOAT 1000 HP MENGGUNAKAN METODE COMPUTIONAL FLUID DYNAMICS Muhammad Fauzan; Adi Wirawan Husodo; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2439

Abstract

The function of a tugboat is to tow or push other ships in harbors, open seas and rivers or canals. The propeller used should have an age according to the docking schedule, which is 5 years. However, the propeller was damaged before the ship docked. The owner ordered a new type of propeller with the Kaplan K4-70 series type. The loading given the results of the contour pressure on the CFD software is run using a variation of the propeller rotation. The FEM method for obtaining Hot Spot Stress uses the stress that occurs, namely the von Mises stress (equivalent stress). S-N curve to analyze the results of voltage values and cycles. After that, the value of the fatigue life of the propeller itself can be found. From the results of this study there is an influence on the thrust and torque values for each variation where from the running results the greatest value is obtained at 198.53 rpm at 18601.503 N and 3810.881 Nm and 234.24 rpm at 41563.213N and 6585.7302 Nm. The effect of variations in propeller rotation on thrust and torque values is that the greater the propeller rotation, the greater the value of thrust and torque as well. The location of the hot spot stress for each variation is at the root back blade of the propeller. The maximum stress/stress that occurs in the propeller is 198.53 rpm at 12.07 MPa, 238.24 rpm at 34.646 Mpa and for 357.35 rpm at 97.393. The effect of loading is that the greater the rpm/load value, the greater the resulting stress value (Von-Misses). The service life of the propeller is 198.53 rpm with a service life of 300 days for 25.865 years. For 238.24 rpm for 22.43 years and for 357.35 rpm for 14.57 years.
Pengaruh Penambahan Becker Mewis Duct pada Perfoma Propeller B-series Husnun Aska Nabilah; Burniadi Moballa; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2628

Abstract

Pollution due to sea transportation is a problem that requires consistent handling. Recent years of research in the field of shipping have focused on reducing exhaust emissions by increasing fuel efficiency and decarbonization. Decarbonization in the shipping industry can be achieved by using energy saving devices to reduce fuel consumption. The Energy Saving Device commonly used in the shipping world is the Becker-Mewis duct (BMD). This study used a variation of the NACA profile on the Becker-Mewis duct fin. The CFD (Computational Fluid Dynamics) method is used to analyze the thrust coefficient and torque coefficient. Becker-Mewis duct was added to increase thrust and torque values. From the results of the analysis that has been carried out without variations from NACA, the thrust coefficient is 0.1526, the torque coefficient is 0.0162 and the efficiency is 0.5261. With the NACA 4412 variation, it has a thrust coefficient of 0.2579, a torque coefficient of 0.0252 and an efficiency of 0.5728. The NACA 4415 variation has a thrust coefficient of 0.2663, a torque coefficient of 0.0260 and an efficiency of 0.5743. With increased efficiency, the addition of Becker-Mewis duct can increase the performance of the propeller
Desain Dan Analisis Kekuatan Struktur Kontruksi Kapal Patroli 13 Meter Menggunakan Finite Element Method (FEM) Rahmat Rosid; Mardi Santoso; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2636

Abstract

In the process of maintaining security and maintenance of the approach lightingsystem (ALS) at the airport area in Natuna which was built on the Natuna coast. So weneed a patrol boat that can meet the criteria in terms of the strength of the ship's structureto maneuver properly and accept internal and external loads. Structural capabilities thatare sufficiently safe are permitted according to BKI rules for ships made of fiberglassreinforced plastic. Case of slamming loading, it will be analyzed whether it is sufficientlysafe in terms of the strength of the construction structure on the 13-meter patrol boat thatloading may occur due to ship operations in the area around the airport. The initialcalculation is to calculate the scantling with a scantling weight of 2,226 tons and then drawthe construction in accordance with the lines plan and general arrangement of the 13 meterpatrol boat. Followed by the provision of a static load from slamming loading of 15,237KPa when the ship is at full speed of 20 knots to find out the response from the ship'sconstruction made of FRP. The value analyzed is the maximum stress (von mises) using theFinite Element Method (FEM) with static structural analysis and slamming loading in theform of pressure on the software as the method chosen in this study. Then raises the stressvalue in the ANSYS software, the maximum stress value that occurs in the construction is13.808 MPa and from this maximum stress value the safety factor value can be calculatedto find out how safe the ship's construction is if it is given a slamming load on the ship. Thesafety factor value in this study is 7,097. From the value of the safety factor it is knownthat the ship is still able to accept slamming loads at full speed.
DESAIN DAN ANALISIS SISTEM PENDINGIN KAPAL TRADISIONAL PENANGKAP IKAN 30 GT PANTAI UTARA LAMONGAN Dimas Bayu Aji S; M Anis Mustaghfirin; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2667

Abstract

There are several methods to cool fishermen's catches, namely the full ice blockmethod, the full refrigeration system method, and the combined ice method andrefrigeration system. Among these methods, the full ice block method is the most commonlychosen method by traditional fishermen because the use of this method is consideredcheaper than other methods. However, in terms of the quality of the fish cooled by thismethod, it is lacking., In this study a calculation of the cooling load of the hold is carriedout which will produce a cooling system using RSW (Refrigerated Seawater) with thesoftware method and will produce a suitable RSW design for the Ijon-in fishing boat hold.In addition, the calculation of the economic aspects of the use of RSW will be carried outcompared to conventional systems. The results of this study found that the coolingrequirement for the hatch was 10.9847064 Kw, therefore the compressor used had acooling capacity of 13.35 kW. Then we get a condenser design with a shell diameter of 350mm and a tube diameter of 25.4 mm and an evaporator design with a shell diameter of 600mm and a tube diameter of 12.7 mm.
Analisis Kekuatan dan Umur Kelelahan (Fatigue Life) Terhadap Pondasi Crane SWL 3,6 Ton pada Kapal LCT 31 Meter dengan Metode FEM (Finite Element Method) Achmad Masykurozi; Adi Wirawan Husodo; Benedicta Dian Alfanda
Proceedings Conference on Marine Engineering and its Application Vol 6 No 1 (2023): Conference on Marine Engineering and its Aplication
Publisher : Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33863/cmea.v6i1.2679

Abstract

– LCT is are transport vessels that can approach platforms and jetties. LCT vessels are equippedwith cranes to facilitate the delivery and transfer of accommodation needs on the ship. Therefore, it isnecessary to plan a crane foundation that can withstand the weight of the crane itself and the load liftedby the crane. The 31-meter LCT ship suffered damage to the crane foundation due to static loads, so it isnecessary to replace the new crane foundation. In this Final Project, we will analyze the strength andfatigue life of the 3.6 ton SWL crane foundation on a 31-meter LCT ship in order to minimize the risk ofwork accidents and estimate the fatigue life of the new crane foundation. To complete this Final Project,the method used is the finite element method by creating a model in AutoCAD 2016 software and analyzingit in the finite element method software. The results of the analysis show that the von mises stress thatoccurs is 124.53 MPa, while the maximum deflection that occurs is 1.54 mm and the safety factor valueis 1.525. These stresses and deflections are in accordance with BKI rules because they do not exceed theallowable stress of 190 MPa and the allowable deflection of 2.75 mm. And for the estimated fatigue lifeof the crane foundation of 28.62 years.
Analisis Tegangan Sistem Perpipaan Cold Reheat Boiler Berkapasitas 2300 Ton/Jam Pada Kondisi Tidak Operasi Mahardhika, Pekik; Adi Wirawan Husodo; Ekky Nur Budiyanto; Benedicta Dian Alfanda; Rina Sandora
Jurnal Teknologi Maritim Vol. 7 No. 2 (2024): Jurnal Teknologi Maritim
Publisher : Pusat Penelitian dan Pengabdian Masyarakat Politeknik Perkapalan Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35991/jtm.v7i2.34

Abstract

Salah satu pembangkit listrik bertenaga uap terbesar di Jawa Timur menggunakan 3 (tiga) unit boiler dengan kapasitas masing-masing sebesar 2300 ton/h untuk mendukung fungsinya. Pada akhir tahun 2023 salah satu unit boiler (Unit-7) dilakukan shut-down untuk melakukan kegiatan perawatan. Perawatan pada sistem perpipaan dilakukan pengecekan terhadap kemungkinan pengurangan ketebalan pipa dan pengecekan terhadap posisi elevasi pipa ketika kondisi tidak beroperasi (cold condition). Salah satu sistem perpipaan pada unit 7 adalah Cold Reheat Pipe (CRP). Analisa tegangan pada sistem perpipaan perlu dilakukan dan menjadi satu kesatuan kegiatan proses pengecekan sistem perpipaan berguna untuk mengetahui apakah dalam kondisi tanpa operasi (cold condition) masih memenuhi kriteria ASME B31.1 (dikatakan aman) atau tidak. Tahapan penelitian ini meliputi pemodelan & simulasi tegangan pipa menggunakan stress analysis software kondisi tanpa operasi (cold condition) dan disesuaikan dengan kriteria penerimaan ASME B31.1. Dari hasil simulasi menunjukkan bahwa seluruh tegangan yang terjadi pada sistem perpipaan CRP BS 130 dan CRP BS 131 lebih rendah dari tegangan izin. Disimpulkan bahwa sistem perpipaan dalam kondisi tidak beroperasi aman bahkan pada ketebalan pipa yang ada.
Co-Authors Achmad Masykurozi Adi Wirawan Husodo Ahmad Muzzammil Burniadi Moballa Dimas Bayu Aji S Ekky Nur Budiyanto Husnun Aska Nabilah M Anis Mustaghfirin Mahardhika, Pekik Mardi Santoso Muhammad Fauzan Nurvita Arumsari Rahmat Rosid Rina Sandora