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All Journal Jurnal Keteknikan Pertanian Bulletin of Electrical Engineering and Informatics International Journal of Innovation in Mechanical Engineering and Advanced Materials
Usman Sudjadi
Pusat Teknologi Bahan Bakar Nuklir (PTBBN), BATAN Kawasan Puspiptek-Tangerang Selatan 15314, Banten
Agriculture, Biological Sciences & Forestry Automotive Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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MECHANICAL STUDY OF 9CR-SS316L-1MO MATERIAL FOR CLADDING NUCLEAR FUEL POWER REACTORS Purnama, Mayda; Sudjadi, Usman
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 4, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v4i2.16832

Abstract

In this research, SS316 steel and modified 9Cr-1Mo steel were developed. The aim is to analyze the results of the hardness test, impact test, bending test, and microstructure. The Mo element was chosen because it has a relatively small microscopic cross-section of the neutron, which is 2.6 barn. The element Mo is in the same periodic period as Zr and Nb, so that the mechanical properties and so on are not much different. In this study, samples of SS316L steel and modified 9Cr-1Mo steel were made. Samples material of 90% SS316L + 9% Cr + 1% Mo were melted by electric arc melting. Tempering was carried out after the smelting process was completed. The sample consisted of 6 pieces, 1 sample did not receive tempering treatment while the other 5 samples received tempering treatment at 100°C, 200°C, 300°C, 400°C, and 500°C. The samples were tested using various methods including Rockwell hardness test, impact test, microstructure test, bending test, and examination of other properties of the material samples. Hardness, impact, and bending test results as well as the samples microstructure were analyzed. The highest decrease in hardness value was in specimen 1 (non-treatment) which was 21.33 HRc and the lowest decrease was in specimen 6 (heat treatment at 500°C) which was 16.66 HRc. For the results of the impact energy test (EI) with an average value, there was not too much difference, namely the highest value was 1.0034 joules/mm2 in specimen 2 (heat treatment at 100°C) and the lowest value was 1.0020 joules/mm2 in specimen 6 (heat treatment at 500°C). The results of the microstructure test showed that the ferrite and pearlite content is still present in the test object. The highest bending test result in sample 6 with 500°C tempering had a maximum load-bearing strength of 1050 Newton so that the bending strength was 7875 kgf/cm2 and the lowest result was in sample 1 without tempering having a maximum load-bearing strength of 670 Newton so that the bending strength was 5025 kgf/ cm2
EXPERIMENTAL STUDY OF COMPRESSOR ENCLOSURE WITH PYRAMID ACCOUSTIC FOAM Noviana, Agus; Sudjadi, Usman
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 5, No 1 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v5i1.21942

Abstract

This study investigates the performance of compressor enclosures for noise absorption, reverberation, and machine ventilation to ensure a safe and healthy working environment for people. The Multi pro air compressor model BC 150 DMBW 1.5 HP is placed in an enclosure made of wood board, and for absorbing material, use 6 cm thick polyurethane pyramid foam. A fan with a flow rate of 280 CMH is used as a cooling medium and will operate simultaneously with the compressor operation. Flow Air Delivery (FAD) of the compressor is 126 L/min. The Sound Pressure Level (SPL) value is determined using a sound level meter before and after the compressor uses the enclosure. In addition, the enclosure's room temperature is recorded within 30 minutes of operation to determine whether there is a significant increase in heat to ensure that the enclosure for this compressor is still within safe limits. Based on the test results, it is known that after a 30-minute operation, the temperature rises from 29 OC to 65 OC in the inlet on the enclosure with the fan off, and the temperature rises from 29 OC to 51 OC on the enclosure with the fan on. While from the results of measuring the sound noise level, taken at a distance of 1 meter outside the enclosure, there is no significant difference, with or without using a fan, the decrease in sound noise level is only about 10 dB, which is 84 dB before using the enclosure, to 74 dB after using the enclosure. So, it can be concluded that the use of fans as coolers is quite effective in maintaining the temperature of the enclosure space when compared to natural cooling through ventilation, but the use of enclosures using pyramid foam material is not effective for reducing the noise level produced by the compressor when operating.
Evaluasi Keekonomian Residue Hutan Tanaman Industri Untuk Pemenuhan Energi di Ibu Kota Negara Adiarso, Adiarso; Wijono, R. Agung; Sudjadi, Usman; Setiawan, Hari; Hermawan, Erwan
Jurnal Keteknikan Pertanian Vol. 12 No. 1 (2024): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.012.1.35-56

Abstract

Dalam waktu 10 tahun terakhir laju pertumbuhan penduduk Indonesia adalah 1.25% per tahun. Dengan meningkatnya populasi Indonesia berdampak terhadap konsumsi energi nasional yang meningkat dari 3.01 barrels oil equivalent (BOE) per kapita di tahun 2013 menjadi 3.12 BOE per kapita di tahun 2020. Salah satu upaya untuk mengurangi emisi ini adalah memanfaatkan sumber energi terbarukan terutama dari sektor kehutanan. Salah satu produknya adalah biomassa atau produk dalam bentuk woodpellet. Biomass dari hasil kegiatan perkebunan karet, logging residue, dan sawn timber residue memiliki potensi energi sebesar 152 GJ per tahun. Salah satu upaya untuk mengatasi permasalahan lingkungan adalah dengan memindahkan Ibu Kota Negara ke Provinsi Kalimantan Timur. Terdapat potensi yang besar untuk memanfaatkan sektor kehutanan dalam mensuplai energi, salah satunya adalah residue dari hutan tanaman industri (HTI). Melalui studi ini akan dihitung keekonomian produk woodpellet dari residue HTI sebagai bahan baku Pembangkit Listrik Tenaga Biomassa (PLTBm). Berdasarkan hasil perhitungan harga minimum wood pellet adalah Rp. 1,700/kg dan diperoleh IRR 13.1%, NPV Rp. 41 miliar, dan payback period 8.1 tahun. Dengan menggunakan input harga keekonomian wood pellet sebagai harga beli bahan baku untuk PLTBm, diperoleh harga keekonomian listrik adalah Rp. 3,000/kwh. Solusi lainnya adalah dengan memproduksi steam, dari hasil perhitungan keekonomian harga steam minimum adalah Rp. 740/kg, sehingga diperoleh keekonomian PLTBm IRR 11.4%, NPV Rp. 21.7 miliar, dan payback period 8.3 tahun.
Effect of gamma radiation on semi-crystalline polyvinyl chloride polymer for low-voltage cable insulator Hutagaol, Antonio Gogo; Bayquni, Muhammad Ilham; Setiawan, Jan; Putranto, Dwi; Sudjadi, Usman; Sungkono, Sungkono; Kriswarini, Rosika; Masrukan, Masrukan; Yunus, Muhamad Yasin
Bulletin of Electrical Engineering and Informatics Vol 14, No 2: April 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i2.7940

Abstract

This study explores the properties of semi-crystalline polyvinyl chloride (PVC) polymer as insulation material for low-voltage (LV) cables under high gamma radiation exposure. Test samples underwent gamma radiation (60Co) at doses of 25, 50, 100, 200, 400, and 800 kGy. The evaluation encompassed surface morphology, electrical conductivity, thermal characteristics, and mechanical properties via tensile tests. Electron microscopy observation indicated surface smoothing and flattening occurred at an irradiation dose of 800 kGy. Gamma radiation with increasing doses results in similar thermogram profiles with slight differences in melting temperature and residue mass. The sample irradiated at a gamma dose of 25 kGy generates an increase in the percentage of crystallinity, indicating the occurrence of crosslinking, while other doses exhibit a decrease of crystallinity with increasing radiation dose. Tensile stress significantly dropped up to 400 kGy but increased at 800 kGy. Elongation at break (EAB) decreased with higher gamma radiation doses. Overall, materials up to 800 kGy remained non-brittle, serving as effective insulators and demonstrating thermal stability within high gamma radiation exposure conditions.
Co-Authors Adiarso, Adiarso Bayquni, Bayquni Hari Setiawan Hermawan, Erwan Hutagaol, Antonio Gogo Jan Setiawan Masrukan Masrukan Noviana, Agus Purnama, Mayda Putranto, Dwi Rosika Kriswarini Sungkono Sungkono Wijono, R. Agung Yunus, Muhamad Yasin