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The Effect of the Gap Distance on The Corrosion Rate of SS400 Steel and C27000 Brass Darmawi - Darmawi
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume VI, Nomor 1, April 2020
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v2i1.7569

Abstract

Crevice corrosion occurs due to differences in oxygen concentration inside and outside the gap. These experiments are conducted on the crevice formed by SS400 Steel and the C27000 Brass on the base of gap distance parameters in the ammonia polluted environment. Such  crevice often found in boiler joints, turbines and machinary parts.  Corrosion rate of SS400 steel when it stand alone in the ammonia environment is 0.7554 mpy while the interface potential is -130 mV VS Cu/CuSO4. The corrosion rate of C27000 Brass when stand alone at related ammonia environment is 20.144 mpy and the interface potential is -1191 mV VS Cu/CuSO4. When both metals combine to form a crevice, the corrosion rate of steel increased by 28% averagingly. The tests include a gap where the two metals mating each other (no distance), forming a distance of 0.239 mm and 0.398 mm. The interface potential of both metals when touch -518 mV VS Cu/CuSO4, -288 mV when formed a gap distance 0.239 mm and 0.398 mm. On the contrary the corrosion rate of Brass C27000 decreases significantly upto 60% when joining to form a gap with steel. Interface potential of Brass C27000 when forming a gap with no distance with steel is – 632 mV VS Cu/CuSO4.
Indonesia Between Asean Countries and the World in Hydroelectricity Darmawi .
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (805.596 KB) | DOI: 10.11591/eecsi.v1.421

Abstract

Hydropower is predicted to be the most favourable energy regarding the global needs to cope with the global warming and the low cost energy resources utilization. Fossil fuel tends to depletion in the coming decades and the fossil energy price will race up. The states which energy is depend only on oil will result in the fragile economic base. Hydropoelectricity is now being energy developed even in a leading petroleum producer country. Indonesia with 75.000 MW hydroelectricity potential all over the country is hoped to generate more power in hydro energy to ascend the percentage of the state renewable energy consumption as a part of Indonesia process to diversify the domestic energy consumption to keep the economic away from oil dependency. Hydropower is the largest source of renewable energy of the world. In year 2005, some 2950 TWh of hydropower was generated, equivalent to 90% of electricity from world renewable energy consumption.
Analisis Aliran Udara Alat Penghemat Energi Vertikal Generasi Kedua untuk Masyarakat Tebing Gerinting Kecamatan Indralaya Selatan Kabupaten Ogan Ilir darmawi darmawi; Qomarul Hadi; Ellyanie; Irwin Bizzy
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2021): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v21i2.156

Abstract

Alat Penghemat Energi Vertikal which is the patent rights of Sriwijaya University  with identity number of IDP 000065109 is already developed in order to raised up the efficiency and the effectivity as energy saver and as heat and exhaust gas eliminator to prevent the users for health and comfortable matters. This product is now called Alat Penghemat Energi Vertikal Generasi Kedua (APEV-2). Among the improvements are the legs of APEV-2 is now made of steel, the base flat is also made of steel. The front air  window area is decreased and the  rack window binder and air hole at the bottom of the APEV-2.