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Analisa Laju Korosi Material Stainless Steel Grade SS304 dan Alloy UNS N08020 Terhadap Asam Sulfat dan Natrium Hidroksida Meryanalinda; Agus Setiyo Umartono; Deddy Setiawan
Wahana Teknik Vol 9 No 1 (2020): Wahana Teknik
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Corrosion is a process of degradation metal quality. Its process will decrease the properties of a metal due to a chemical reaction between a metal or alloy with its environment. This research aims at investigating the corrosion rate of SS304 and UNS N08020 alloy in sulfuric acid solution and sodium hydroxide solution. In this study, the samples of SS304 and UNS N08020 alloy are immersed for 49 days in different solution. The method for calculate the corrosion rate is the weight loss method. The results of the corrosion rate test carried out for 49 days and the weight of the material was weighed once every 1 week, the value of the SS304 grade stainless steel material with battery water immersion media was 5.6439653 mm/y, on the SS304 grade stainless steel material with soda solution dipping media fire is 0.0075844 mm/y, on UNS N08020 alloy material with battery water immersion media is 0.0179111 mm/y, on UNS N08020 alloy material with caustic soda solution immersion media is 0.0082329 mm/y. Corrosion that occurs in each material is pitting corrosion. Keywords: corrosion, loss, pitting, rate, SS304, UNS N08020, weight.
Perancangan Gear Box Penarik Kapal Sistem Airbag Kapasitas 7000 Ton Meryanalinda; Wardjito; Wijaksi Dimas Putra
Wahana Teknik Vol 8 No 1 (2019): Wahana Teknik
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Gear box merupakan sistem yang berfungsi untuk mengonversi torsi dan kecepatan (putaran) dari mesin menjadi torsi dan kecepatan yang berbeda-beda untuk diteruskan ke penggerak akhir. Konversi ini mengubah kecepatan putaran yang tinggi, menjadi lebih rendah tetapi bertenaga. Salah satu sistem gear box adalah roda gigi. Roda gigi sendiri berperan sebagai pereduksi putaran dari momen torsi pada keadaan yang bervariatif dan diperlukan perancangan yang sesuai dengan kondisi yang diharapkan. Selain harus memiliki rancangan yang sesuai, gear box juga harus dapat meredam getaran yang timbul akibat perputaran dan pergesekan antar roda gigi. Dalam penelitian ini dilakukan pengukuran untuk mendapatkan ukuran dimensi dari roda gigi, poros, pasak dan bantalan. Kemudian dicari momen gaya yang bekerja. Serta mencari faktor keamanan dan bahan yang dipakai AISI 4140, AISI 1095 dan AISI 52100 didasarkan pada kekuatan lentur dan kekuatan tarik. Hasil penelitian ini menunjukkan bahwa pada kapal sistem airbag dibutuhkan dua gear box dengan nilai torsi 23.814,6 kg.m persatu gear box, diameter tali baja 52 mm, panjang tali baja 512 m, diameter drum winch 1.500 mm dan panjang gear box 2.000 mm. Kata kunci: bantalan, gear box, pasak, poros, roda gigi
Perencanaan Make Up Water Tank Kapasitas 500 kl PLTGU Blok I, II, dan III PT PJB UP Gresik Meryanalinda; Wardjito; Ahmad Setyawan
Wahana Teknik Vol 9 No 2 (2020): Wahana Teknik
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At the steam gas power plant (PLTGU) there are various kinds of equipment, namely common, Gas Turbine (GT), Steam Turbine (ST). In common, the main water system has a very important role. Where the water raw material will later be used as a cooling system & the main ingredient into steam (dry steam). This process starts from processing seawater into feed water that has a certain pH and conductivity, then it is processed in the water treatment plant (pH 8-9 and conductivity ≤ 1 µ/cm). To maintain the supply of the main ingredient of water, it is necessary to have a storage that functions to ensure the availability of make up water supply during normal unit operation. This research was conducted to find out in planning the make up water storage tank with a capacity of 500 kl at PLTGU Gresik Generation Unit. Dimension of make up water tank is 9,125 m high & 10 m diameter and using ASTM A36 material in accordance with API 650 standard. The calculation results are known that the thickness of the 1st shell plate is 7 mm, the 2nd shell plate is 6 mm, the 3rd shell plate is 5 mm, and the 4th shell plate is 5 mm. The thickness of the bottom plate and annular plate is 10 mm, with the results of these calculations it is recommended that a welding procedure be made according to the thickness of the shell plate. Keywords: API standard 650, Make up, Tank, Treatment, Water, Welding
Analisis Variasi Sudut Kampuh V Terhadap Sifat Mekanik Sambungan Las Baja ASTM A36 Meryanalinda; Muchammad Sochib; Ahmad Habibullah
Wahana Teknik Vol 10 No 1 (2021): Wahana Teknik
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In the book AWS D1.1 the allowable open weld angle is between 60o to 75o, then is there a difference in mechanical strength between the 60o angle and the 75o angle?. This will be studied in this study and aims to compare the effect of variations in the V 60o joint angle with the V 75o joint angle on the mechanical properties of ASTM A36 carbon steel welded joints with with a width of 180 mm and a thickness of 16 mm. This research method using tensile test and vickers test. Tensile test process used to measure the resistance of a material to static forces given slowly. The obtained mechanical properties are known as strength and elasticity of metal. In the tensile test the load is given continuously and slowly increases in size, at the same time observations are made about the elongation experienced by the test object and a stress-strain curve is produced. Hardness testing using the vickers method aims to determine hardness of a material. Based on research that has been carried out, the conclusions are as follows: a) in welding the V 60o seam angle requires a welding electrode of 0.20 kg and in welding a 75o V seam angle requires a welding electrode of 0.27 kg, b) variation of the angle of V 75o has the largest stress value on specimen B2 with a value of 444.25 Mpa, c) specimens with variations in the V 60o joint angle have a higher hardness value than the specimen with a 75o V joint angle variation. Keywords: Analysis, Angle, ASTM A36, Joints, Mechanical, Properties, Steel, Welded, Variation.
Co-Authors Agus Setiyo Umartono Ahmad Habibullah Ahmad Setyawan Deddy Setiawan Muchammad Sochib Wardjito Wijaksi Dimas Putra