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All Journal Journal of Energy, Mechanical, Material and Manufacturing Engineering Indonesian Journal of Chemistry Jurnal Metalurgi dan Material Indonesia
Husaini Ardy
Kelompok Keahlian Ilmu Dan Teknik Material, Fakultas Teknik Mesin Dan Dirgantara, Institut Teknologi Bandung
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisa Kegagalan Bantalan Bola di Pompa Pelumas Turbin Gas Chevira Destri Pramesthi; Arie Wibowo; Husaini Ardy
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Abstract

Bantalan bola pompa pelumas sebuah turbin gas mengalami kegagalan pada awal operasi. Bola bantalan tidak bisa berputar, terdapat indikasi pemanasan berlebihan pada ring dalam dan luar. Penyebab kegagalan bantalan dianalisa dengan pemeriksaan visual, analisis komposisi kimia, analisis struktur mikro, dan uji keras. Efek pemanasan berlebihan ditunjukkan oleh warna permukaan yang lebih gelap pada ring luar dan dalam akibat gesekan dengan bola. Komponen ring luar dan bola terbuat dari material yang sama yaitu JIS G4805 Grade SUJ1, setara dengan ASTM A485 Grade 1. Struktur mikro ring luar dan bola dari bagian tidak rusak relatif sama, yaitu martensit temper dan partikel karbida. Struktur mikro martensit temper dan partikel karbida pada ring luar dan bola yang mengalami kerusakan parah berubah menjadi bongkahan karbida pada lokasi kontak. Kekerasan komponen bantalan yang tidak rusak diuji untuk menjadi acuan nilai kekerasan awal material. Kekerasan awal bola adalah 435 VHN, ring dalam adalah 249 VHN, dan ring luar adalah 742 VHN. Kekerasan ring dalam jauh lebih rendah dari ring luar akibat pemanasan berulang menggunakan welding torch pada waktu pemasangan dan pelepasan bantalan ke dan dari poros. Temperatur pemanasan diduga mencapai temperatur 650. Kekerasan ring luar yang mengalami kerusakan parah adalah 756 VHN, dan bola yang rusak parah adalah 480 VHN. Kekerasan yang meningkat adalah akibat terbentuknya gumpalan karbida karena ada karbon dari sisa grease yang berdifusi ke dalam ring luar ketika terjadi gesekan antara bola dan ring luar. Penyebab utama kerusakan bantalan bola tersebut adalah keteledoran operator yang tidak menambah grease setelah pemanasan ketika memasang poros ke bantalan. Pemanasan tersebut akan menguapkan grease dan menghilangkan efek lubrikasinya, sehingga bola tidak bisa berputar, dan akhirnya terjadi gesekan relatif antara bola dengan ring dalam dan ring luar. Penyebab ini didukung oleh data temperatur stabilitas grease (sekitar 110), yang mendekati temperatur maksimum pemanasan yang diijinkan oleh pabrik pompa, yaitu 93.
Analisa Kegagalan Tubing Hidraulik untuk Instrumen Nadya Laurenza; Arie Wibowo; Husaini Ardy
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Hydraulics tubing austenitic stainless steel 316L for offshore instrument was failed due to pitting corrosions attack. This research aims to determine the root causes of tube leakage by visual examination of new and failed tube, scanning electron microscope (SEM) examination, deposits analysis by energy dispersive spectroscope (EDS), and microstructural analysis by light microscope. The examination results show that pitting corrosions were originated from surface defects as residences for deposit and marine growth. Pitting corrosions form a tunneling underneath the surface which one of the characteristic of sulpfhur reduced bacteria (SRB) corrosion. This conclusion is also supported by high sulphur concentration in surface deposit as a results of bacteria metabolisms and formation of FeS compound. Crevice corrosion also contributed to pitting formation because critical crevice temperature of 316L tubing material is around 10oC, lower than the service environment temperature. These two corrosion modes may occur separately or combined. Surface defects might be originated from improper handling, storage, or during construction, which induce scratches on tubing surface. To prevent pitting corrosion reoccurence, it is recommended to use fire retardant polyurethane thermoplastic rubber sheathing stainless steel 316L tube or superduplex stainless steel tube material which critical crevice temperature is 35˚C.
The Effect of Copper (II) Nitrate Addition and Tensile Stress on SCC of C44500 Material Tube Farhan Adi Farrasandi; Firmansyah Sasmita; Husaini Ardy
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.19827

Abstract

The heat exchanger is an intermediary for two or more fluids that flow both inside and outside of the heat exchanger to distribute heat. This process was aimed to increase efficiency levels in the process industry. One of the suitable materials for the tube is UNS C44500, also known as admiralty brass consists of 70Cu-30Zn, which has high thermal conductivity and good corrosion resistance. However, admiralty brass was susceptible to stress corrosion cracking (SCC) when faced with nitrate since the tube was also loaded by internal stress. Moreover, SCC was also exacerbated by dezincification. The C-ring test method examined the effect of nitrate compounds and dezincification on SCC in C44500 Tube components. Tensile stresses varied between 15, 45, and 85% of yield strength, which were immersed into nitrate solutions consisting of NaNO3 and Cu(NO3)2. Some specimens were washed using 20% ​​HCl to bring up dezincification. The results obtained that SCC occurred at the highest Cu(NO3)2 concentration, identified by longitudinal crack and passivity breakdown. All of the dezincified specimens were found cracked due to SCC after immersion into 1 M Cu (NO3)2, while un-dezincified were failed when given tensile stress between 45% to 85% of maximum yield strength.
Polyvinyl Alcohol-Cellulose Nanocrystal Hydrogel Containing Anti-inflammatory Agent Lia Amelia Tresna Wulan Asri; Athiya Anindya; Yuni Eva Kartika; Dita Puspitasari; Untung Triadhi; Husaini Ardy
Indonesian Journal of Chemistry Vol 22, No 5 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.73357

Abstract

Hydrogel wound dressings were developed through cross-linking reactions of polyvinyl alcohol (PVA) with glutaraldehyde and by the addition of diclofenac sodium and rutin as anti-inflammatory agents. Cellulose nanocrystals (CNC) were added to improve mechanically and release properties. CNC was isolated from pineapple leaf fibers through the ammonium persulfate method resulting in a mixture of rod-like whisker and spherical morphology. The mechanical properties of hydrogels are increasing with the addition of CNC. Hydrogels containing 8% CNC exhibited 7.266 N/mm2 tensile strength, 156.3% maximum strain, and 700.3 N/mm2 elastic modulus. Drug release tests containing sodium diclofenac were done by taking incubated phosphate buffer saline samples in a pH 7.4 environment and showed that all CNC variations tested are controllable for the first 30 min compared to the sample without CNC. Sodium diclofenac is easily eluted from hydrogel due to its polar properties, and all samples almost demonstrated the same release profile. PVA hydrogels showed fluctuating concentrations of diclofenac compared to others. While hydrogels containing rutin showed a controlled release mode, the addition of CNC in PVA resulted in a slower release of rutin, possibly due to the better binding between CNC and rutin. To conclude, CNC has successfully improved the performance of PVA hydrogels, including the drug release properties.
Co-Authors Arie Wibowo Athiya Anindya Chevira Destri Pramesthi Dita Puspitasari Farhan Adi Farrasandi Firmansyah Sasmita Lia Amelia Tresna Wulan Asri Nadya Laurenza Untung Triadhi Yuni Eva Kartika