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All Journal IPTEK The Journal of Engineering Jurnal Nasional Aplikasi Mekatronika, Otomasi dan Robot Industri (AMORI)
Dimitra Meidina Kusnadi
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Mechanical Engineering

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Redesign of the coal gate on a 20 ton/hour chain grate boiler at pt sopanusa Suhariyanto; Rusdiyana, Liza; Dika Andini Suryandari; Dimitra Meidina Kusnadi; Hafizh Naufal Atho’ulloh
Jurnal Nasional Aplikasi Mekatronika, Otomasi dan Robot Industri (AMORI) Vol 4 No 2 (2025): December
Publisher : Faculty of Vocational Studies - Research Center, DRPM ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27213560.v4i2.9362

Abstract

A chain grate boiler is a type of boiler with a moving grate system to transport solid fuel through the furnace. The coal gate regulates the distribution flow of coal from the hopper to the furnace. In the 20 tons/hour capacity chain grate boiler at PT Sopanusa, the existing coal gate experienced mechanical failure due to damage to components in the roller chain, shaft, and bearings, so that it could not operate as a coal distribution regulator. To overcome this problem, it is necessary to redesign the coal gate on the 20 tons/hour capacity boiler chain grate hopper at PT Sopanusa. The main components, such as the chain, sprocket, worm gear, shaft, bearing, and pin on the coal gate, need to be redesigned to avoid mechanical failure of the coal gate. After redesigning the main components of the coal gate, a coal gate design that is compatible with the boiler chain grate construction will be obtained. The results of the coal gate redesign are as follows: a lifting chain with Chain Grade 80 type, 4 mm diameter, and a sprocket diameter of 320.92 mm; a worm gear with a ratio of 30:1 using hardened steel for the worm and phosphor bronze for the gear; a shaft with S45C material, 60 mm diameter; bearings using single row deep groove ball bearings, unit number ASB Bearing UCP 212; and pins made of SAE 1045 material with dimensions of 60x20x12 mm to support the manual coal gate mechanism on the 20 tons/hour capacity boiler chain grate at PT Sopanusa.
Synergistic Temperature Effect on the Acid Corrosion Inhibition of API 5L Grade B Steel Using Eichhornia crassipes Leaf Extract Laksita Aji Safitri; Eddy Widiyono; Hari Subiyanto; Dimitra Meidina Kusnadi; Yusuf Tanto Kuswanto; Nur Husodo
IPTEK The Journal of Engineering Vol. 11 No. 3 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

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Abstract

Corrosion is the deterioration of material properties, particularly metals, due to chemical reactions with the surrounding environment. One of the effective methods to mitigate corrosion is the addition of inhibitors. Organic inhibitors are considered environmentally friendly, cost-effective, and renewable. In this study, an extract of water hyacinth leaves (Eichhornia crassipes) was used as an organic inhibitor. The material tested was API 5L Grade B steel in 1 M HCl solution as the corrosive medium, with testing temperatures of 30 °C, 40 °C, 50 °C, and 60 °C, and inhibitor concentrations ranging from 500 mg to 2500 mg. The corrosion behavior was evaluated using Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS), and Weight Loss (WL) methods. The results showed a significant reduction in the corrosion rate of API 5L Grade B steel in 1 M HCl solution when the water hyacinth extract inhibitor was added. In the PDP test, the corrosion rate for the sample without inhibitor reached 107.4 mm/year, while the lowest inhibition efficiency was 1.25% and the highest inhibition efficiency was 97.85%, observed at 50 °C with an inhibitor concentration of 2500 mg. This represents the maximum efficiency among all tested concentrations and temperatures.
Co-Authors Dika Andini Suryandari Eddy Widiyono Hafizh Naufal Atho’ulloh Hari Subiyanto Laksita Aji Safitri Liza Rusdiyana Nur Husodo Suhariyanto Yusuf Tanto Kuswanto