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All Journal Jurnal Pendidikan Fisika dan Teknologi Jurnal Pendidikan Teknik Mesin Undiksha
Pelangi Eka Yuwita
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Automotive Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering Physics

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The Analysis of the Effect of Gate Valve Leakage on Piping Systems Using the Lapping Repair Method: Analisis Pengaruh Kebocoran Gate Valve Pada Sistem Perpipaan Menggunakan Metode Perbaikan Lapping M. Roekhanum Majid; Mohammad Anshori; Pelangi Eka Yuwita
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Gate valve merupakan komponen penting dalam sistem perpipaan industri yang berfungsi mengatur dan menghentikan aliran fluida. Seiring waktu, penggunaan yang terus-menerus dapat menyebabkan kerusakan pada permukaan gate dan seat, seperti aus dan korosi, yang mengakibatkan terjadinya kebocoran internal. Penelitian ini bertujuan untuk menganalisis seberapa efektif perbaikan menggunakan metode lapping dapat mengurangi tingkat kebocoran pada gate valve, serta mengevaluasi kinerja melalui simulasi menggunakan perangkat lunak Autodesk Inventor. Metode lapping diterapkan untuk menghaluskan dan meratakan permukaan yang rusak agar fungsi gate valve dapat kembali optimal. Pengujian dilakukan dengan metode hydrotest untuk mengukur tingkat kebocoran secara langsung, serta simulasi tekanan dengan variasi tekanan antara 500 psi hingga 3000 psi. Hasil penelitian menunjukkan bahwa perbaikan dengan metode lapping secara signifikan mampu mengurangi kebocoran internal, yang terlihat pada hasil uji langsung maupun visualisasi simulasi. Analisis statistik menggunakan uji paired t-test menunjukkan terdapat perbedaan yang signifikan antara kondisi sebelum dan sesudah perbaikan.   Gate valves are essential components in industrial piping systems that regulate and stop fluid flow. Over time, continuous use can cause damage to the gate and seat surfaces, such as wear and corrosion, resulting in internal leaks. This study aims to analyze the effectiveness of repairs using the lapping method in reducing gate valve leakage levels, and evaluate performance through simulations using SolidWorks Flow Simulation software. The lapping method is applied to smooth and level the damaged surface so that the gate valve can function optimally again. Tests were conducted using the hydrotest method to directly measure the leakage level, as well as fluid flow simulations with pressure variations between 500 psi and 3000 psi. The results showed that repairs using the lapping method were significantly able to reduce internal leaks, as seen in the results of direct tests and simulation visualizations. Statistical analysis using a paired t-test showed a significant difference between the conditions before and after repair.
Synthesis and Characterization of used Oil Bio-Adsorbent Material based on Corn Husk Activated Carbon Pelangi Eka Yuwita; Roihatur Rohmah; Moh. Mu'id Efendi
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 1 (2024): January-June
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i1.6843

Abstract

Used oil waste is classified as hazardous B3 waste that poses a significant environmental threat. To address the hazards posed by used oil waste, synthesizing activated carbon as an adsorbent for used oil is necessary. This research aims to synthesize and characterize activated carbon from corn husk waste as an adsorbent material for used oil. The methods employed in this research include dehydration, carbonization, and activation using HCl and NH4OH. The structure was analyzed using XRD, UV-visible spectrophotometer, and Oswald viscometer, followed by variations in mesh sizes of 60 and 100 and the addition of PEG. Based on the research results, variations in 60 and 100 mesh have nearly identical X-ray diffraction patterns, with values of 2θ at 19.2074° and 23.0729° in the 60mesh variation, and 2θ at 19.1333° and 23.2161°, which are indicative of graphite diffraction patterns as they fall within the ~25° range and match the CIF 9014004 data for phase C Graphite with space group p6/mmm. In UV-Visible spectrophotometer testing, variations of 60 mesh without PEG, 100 mesh without PEG, 60 mesh with PEG, and 100 mesh with PEG showed absorbance values of 2.3, 1.58, 1.394, and 0.966, respectively, and viscosity values of 22.089, 20.089, 21.09, and 19.21 cP. The 100mesh sample with the addition of PEG is the variation that can effectively adsorb used oil.
Potential of Tebalan Shells from Tuban Beach as Active Material in Perovskite Solar Cells Roihatur Rohmah; Pelangi Eka Yuwita; Prayoga Dewa Pangestu; Erlangga Dwi Aprila Vibianto
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 2 (2024): July - December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i2.7700

Abstract

One source of environmentally friendly renewable energy that has begun to be widely developed is PSC (Perovskite Solar Cell) made from natural ingredients. PSC is a new breakthrough strategic mineral processing technology as an alternative to silicon in the industry of solar power safety and stability. PSCs are easier to manufacture compared to silicon-based solar cells. The PSC material in this research is perovskite CaTiO3 which is made from the reaction between calcium carbonate (CaCO3) which is obtained from the Tebalan shell powder of Tuban beach and titanium dioxide (TiO2). The method used in this research is substrate preparation, synthesis of Perovskite CaTiO3, making TiO2 paste2, electrolyte solution preparation, counter electrode preparation, fabrication perovskite solar cell (PSC), as well as testing, characterization and data analysis. The tests and characterization that will be carried out are: Crystal structure of powdered materials used in making perovskite solar cells using XRD (X-ray Diffractometer) type X-Pert3 Powder, testing electric current with a potentiometer, and measuring light with a lux meter. The results of XRD testing on the calcined powder showed that the structure of calcium titanate perovskite (CaTiO3) was as much as 68.2%. Meanwhile, the characteristic values ​​of the electrical properties of Tebalan clam shell perovskite solar cells from the lamp light source data obtained show that Vm and Im Daylight lamps have a greater value than warm white lamps and the efficiency value of the solar light source is highest when shown Air Mass 1.5, which is 0.000127%.
Co-Authors Anshori, Mohammad Erlangga Dwi Aprila Vibianto M. Roekhanum Majid Moh. Mu'id Efendi Prayoga Dewa Pangestu Roihatur Rohmah