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All Journal Jurnal Bluefin Fisheries
Jefta Ratela
Politeknik Kelautan dan Perikanan Bitung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Engineering Mechanical Engineering

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Kekuatan tarik logam hasil pengelasan dengan las listrik dan las LPG Jefta Ratela; Jozua Huwae; Marinus Tappy; Raman Simanjuntak; Lexy Hosang; Novie Wijaya
JURNAL BLUEFIN FISHERIES Vol 1, No 1 (2019)
Publisher : Politeknik Kelautan dan Perikanan Bitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.218 KB) | DOI: 10.15578/jbf.v1i1.2

Abstract

Steel welding, especially soft steel with carbon content ranging from 0.3%, which is installed in the construction of fishing vessels, often using various types of electrodes including kobe steel RB, 26 Niko steel RD 260 Esap steel OK 46,64, Philips steel PH 68 JIS D 4314, AWS E 6013 and others, while LPG Las only uses bait welding from welding wire with a size of 3-5 mm. The purpose of this study is to examine the tensile strength of metal welding results between welds of Electricity with LPG Welding. The variable observed in this study is the amount of tensile strength in two types of electric welding machines and LPG welding. From the data obtained from the test results, then the magnitude of the tensile strength is sought by distributing the results of observations with cross sections of test specimens used in the form of stretch loads, mouth strength, maximum load, maximum tensile strength, broken load and elastic modulus. From the results of the tensile testing performed, it turns out that there is a difference in the welding power of Electric with LPG Gas welding where the electric welding strength is greater than the welding strength of LPG Gas. The electric weld tensile strength is 69.13 Kgf / mm² and LPG Gas welding is 26.20 Kgf / mm²
EFEK KONFIGURASI BAFFLE PADA HEAT EXCHANGER TYPE SHELL AND TUBE SEBAGAI PEMANAS BAHAN BAKAR BIODIESEL B20 Josua Huwae; Barokah Barokah; Marinus Tappy; Jefta Ratela; Fahriadi Pakaya; Maful Suranto; Baihaqi Baihaqi
JURNAL BLUEFIN FISHERIES Vol 3, No 2 (2021)
Publisher : Politeknik Kelautan dan Perikanan Bitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.452 KB) | DOI: 10.15578/jbf.v3i2.109

Abstract

B20 is a fuel that is widely used for combustion systems in diesel engines, especially in Indonesia. Apart from having the advantages, biodiesel B20 also has various disadvantages that affect the performance of diesel engines such as those that have a higher flash point than diesel so that biodiesel is more difficult to burn and has a high viscosity which causes less good atomization of fuel and eventually causes deposits in combustion chamber. One or the solution to the problem is that it can be done carefully. The aim of this research is to make a Shell and Tube Heat Exchanger (STHE) by including the insulation in it to improve the heat exchange performance. The method applied in this research is an experiment by testing the performance of the heat exchanger using a cooling water jacket. Some of the equipment used is a diesel engine from the Mitsubishi Diesel Engine, Type 4d35, 4 cylinder, 75 HP. Data were collected at a constant rotation of 1500 rpm at no load. The results showed that the higher the cooling water temperature of the jacket, the higher the biodiesel temperature. With a cooling water jacket temperature of 83oC, it can heat biodiesel at 74.8oC. Keywords : B20 Fuel Oil; Diesel Engine; Heater; Heat Recovery; Jacket Cooler
Co-Authors Baihaqi Baihaqi Barokah Josua Huwae Jozua Huwae Lexy Hosang Maful Suranto Marinus S. Tappy Novie Wijaya Pakaya, Fahriadi Raman Simanjuntak