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All Journal Jurnal Vokasi Mekanika TOFEDU: The Future of Education Journal
Mukhnizar Mukhnizar
Universitas Ekasakti Padang
Education Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Other

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ANALISIS PENURUNAN KINERJA POMPA SENTRIFUGAL EBARA 125 X 100 FS4KA DI KOLAM LATIH WATER PIT POLITEKNIK PELAYARAN SUMATERA BARAT Hasri Devin; Risal Abu; Mukhnizar Mukhnizar
Jurnal Vokasi Mekanika (VoMek) Vol 5 No 4 (2023): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v5i4.587

Abstract

Kolam latih politeknik Pelayaran Sumatera Barat terletak dikampus jalan Tiram Syech Burhanuddin Padang Pariaman ialah tempat latihan peserta didik yang ikut Diklat Keterampilan Khusus Pelaut (DKKP) seperti salah satunya Sertifikat Basic Safety Training. Oleh sebab itu kolam latih tak lepas dari pompa sentrifugal menjadi kebutuhan pada industri khususnya industri pelayaran yang membutuhkan pemindahan fluida yang bekerja dengan handal. Penelitian ini bertujuan mengetahui pengaruh tingkat keausan diameter impeller pada kinerja pompa sentrifugal Ebara 125 x 100 FS4KA yang dipakai pada pompa pompa sirkulasi air di kolam latih water pit Politeknik Pelayaran Sumatera Barat. Metode studi lapangan di dapat nilai atau parameter pada pompa dan dilakukan pengolahan, data-data yang di dapat dari keausan diameter impeller sangat berpengaruh terhadap kinerja pompa. Dan sebelum pompa diperbaiki dengan diameter impeller 245 mm, maka kapasitas pompa sebesar 78 m3/jam, Daya Hidrolis pompa sebesar 5.8 Kw, Head pompa sebesar 27.4 m, Efisiensi pompa sebesar 43.20 % dan Kecepatan Fluida sebesar 1.014 m/det. Setelah melakukan perbaikan pada pompa sentrifugal dengan mengganti impeller dengan yang baru dengan size impeller sebesar 250 mm, maka kinerja pompa sentrifugal Evara 125 x 100 FS4KA adalah: Kapasitas pompa sebesar 80 m3/jam, Daya Hidrolis pompa 6.04 KW, Head pompa sebesar 28 m, Efisiensi pompa sebesar 45.24 % dan Kecepatan Fluida sebesar 1.032 m/det. Dengan adanya perbaikan pompa sentrifugal dengan mengganti impeller dengan ukuran diameter size 250 mm maka kinerja pompa sentrifugal Ebara 125 x 100 FS4KA mengalami peningkatan.
The Analysis of Current Variation in TIG (Tungsten Inert Gas) Welding on the Tensile Test Results of Aluminum 5083 Plates Neida Abadia El Islami; Mukhnizar Mukhnizar; Zulkarnain Zulkarnain
The Future of Education Journal Vol 4 No 9 (2025)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i9.1252

Abstract

Tig welding (Tungsten Inert Gas) is one of the metal connections by welding on the surface of the plates connected to each other at the same time an electric current is passed so that the surface becomes hot and melts due to electrical resistance. Where Aluminum 5083 has a maximum tensile strength of 317 MPa (46,000Psi). This study aims to determine the results of tensile testing on welded joints using TIG welding (Tungsten Inert Gas) on Aluminum 5083 material. Quantitative research approach. The research technique used is an experiment, the research location was carried out in the mechanical engineering laboratory of Ekasakti University Padang and in the Mechanical Engineering Laboratory of ITP (Padang Institute of Technology). From the 100A current strength specimen, the average value was obtained: Maximum tensile stress ( , Yield Stress ( (2.354.4 N/mm2), Strain ( ) (0,02228%), Modulus of Elasticity ( ) (1.930.7360 N/mm2). And with a current of 120A, the average obtained is: Maximum Tensile Strength (  (62,9311 N/mm2), Yield Stress ( Strain ( ) (0.059.58%), Modulus of Elasticity ( ) (1,056,24 N/mm2). Based on the research results, it shows that the tensile strength results based on the current strength in TIG (Tungsten Inert Gas) welding, the average value with a welding current of 120A has a higher and greater tensile stress, yield stress, and strain compared to a current of 100A. This shows that the connection with a welding current of 120A is better than the welding current of 100A.
Analysis of the Effect of Artificial Aging on the Mechanical Properties of Al 2014 Riski Riski; Risal Abu; Mukhnizar Mukhnizar
The Future of Education Journal Vol 4 No 9 (2025)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i9.1253

Abstract

Aluminum alloy 2014 (Al 2014) is an Al-Cu–based alloy widely used in the aerospace and automotive industries due to its high mechanical strength. However, the mechanical properties of this alloy are strongly influenced by heat treatment, particularly the artificial aging process. This study aims to analyze the effect of artificial aging on the mechanical properties of Al 2014, especially hardness. The Al 2014 samples underwent solution heat treatment at a specified temperature, followed by rapid cooling (quenching) and subsequent artificial aging at various temperatures and holding times. The mechanical test results show that increasing the aging temperature and duration significantly affects the formation of strengthening precipitates, leading to increased hardness until reaching the optimum condition (peak aging). However, excessive aging results in overaging, which reduces mechanical properties due to coarsening of precipitates. Therefore, a precise artificial aging process is essential to optimize the mechanical performance of Al 2014 for engineering applications.
Analysis of the Effects of Spark Plug Type and Electrode Gap on Exhaust Emission Performance: A Case Study of the Toyota Limo Arsy Sulaiman; Risal Abu; Mukhnizar Mukhnizar
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i2.1991

Abstract

The transportation sector is the largest contributor to air pollution in urban areas due to the extensive use of fossil fuels. This study aims to analyze the effect of spark plug types and variations in electrode gap distance on the exhaust emission levels of Carbon Monoxide (CO) and Hydrocarbons (HC) in a 2008 Toyota Limo. The testing parameters utilized three types of spark plugs nickel, platinum, and iridium with variations in gap distances: standard (0.9 mm–1.1 mm), narrow (0.5 mm), and wide (1.5 mm) across various engine speeds (RPM). ​The research method involved direct testing using a Gas Analyzer at the Motor Vehicle Testing Technical Service Unit (UPT-PKB) in Padang Pariaman Regency. The collected data, comprising CO and HC emission results, were analyzed to determine the combustion efficiency within the combustion chamber. ​The results indicate that the spark plug gap distance has a more significant impact on emissions than the spark plug material itself. Using the standard gap distance consistently yielded the best emission results across all spark plug types. Overall, the iridium spark plug with a 1.1 mm standard gap produced the lowest emission levels, specifically 0.36% for CO and 55 ppm for HC at 2000 RPM. This proves that premium electrode materials produce a more focused and powerful spark, leading to more complete and environmentally friendly combustion, provided they are supported by the manufacturer's recommended gap distance
The Effect of Welding Current Variations on the Tensile Strength of A36 Steel Plates in Shielded Metal Arc Welding (SMAW) Mukhnizar Mukhnizar; Irfan Putra; Afdal Afdal
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

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

Abstract

During the welding process, the metal will experience a thermal cycle, which is a rapid heating and cooling process in the welding area that causes a metallurgical process, the deformation that occurs will affect the results of the welding such as the type of defects produced, joint strength, tensile strength and metal microstructure (Teguh Wiyono, 2012). This study aims to determine the effect of welding current variations on the tensile strength of A36 carbon steel welds with the SMAW welding technique. From the results of the data processing obtained, it can be concluded that the highest tensile strength is found in the SMAW connection of ASTM A36 steel plates using a current of 140 A with a value of 448.3 Kgf/mm2. The lowest tensile strength is found in the SMAW connection of ASTM A36 steel plates using a current of 100 A with a value of 63.18 Kgf/mm2. And from testing 6 specimens using three (3) different types of current strength, it can be concluded that the greater the current strength value will produce a high tensile test value.
Performance Analysis of a Booster Pump for Increasing Fluid Flow Rate Putra Ramadhan; Mukhnizar Mukhnizar; Zulkarnain Zulkarnain
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i2.2107

Abstract

The booster pump is a type of dynamic pump designed to increase pressure and flow rate in a clean water distribution system. This study aims to analyze the performance of a booster pump in increasing fluid discharge in the Padang City Regional Drinking Water Company (PERUMDA). The analysis focuses on the relationship between total head, pressure loss, and pump power to determine the effectiveness of the booster pump compared to a conventional centrifugal pump. The results showed that the booster pump increased discharge from 0.067 m³/s to 0.0833 m³/s, achieving a total head of 42.3 m. The required hydraulic power was 43.75 kW, with an efficiency of 79.07%. The analysis indicated that friction and elbow losses totaled 25.56 m, decreasing as the elbow angle was reduced. Overall, the booster pump effectively enhanced both fluid discharge and pressure with minimal power increase.
Performance Evaluation of a Centrifugal Pump at the Gunung Pangilun Drinking Water Treatment Installation, Padang Regional Public Water Utility Company Rama Pranata; Risal Abu; Mukhnizar Mukhnizar
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i2.2111

Abstract

The availability of clean water is a fundamental need that must be continuously ensured. The Regional Drinking Water Company (Perumda) of Padang City utilizes centrifugal pumps to distribute water from the intake to the reservoir. However, decreased pump performance can lead to an imbalance between water supply capacity and demand. This study aims to analyze the performance of centrifugal pumps at the Gunung Pangilun Water Treatment Unit, particularly in terms of flow capacity, efficiency, and power consumption. The results show that the combined actual discharge of two pumps was 2250 m³/h, which is 24.24% lower than the specified capacity of 2970 m³/h. The average head was 42 meters with a discharge pressure of 4.2 bar. The pump efficiency decreased compared to the design condition due to flow losses and equipment aging factors. It can be concluded that the pump performance is still within an acceptable range but has experienced a decline in capacity and efficiency. Therefore, regular maintenance and system evaluation are required to improve operational performance and energy efficiency.
An Analysis of the Tensile Strength of Spot Welded Joints in ST40 Low-Carbon Steel Rahmat Hidayat; Mukhnizar Mukhnizar; Azmil Azman
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i2.2145

Abstract

Spot welding is widely used in the automotive industry due to its fast process, efficiency, and neat joint results. However, the joint strength is highly influenced by welding parameters, especially pressing time. This study aims to determine the tensile strength of spot-welded joints on low-carbon steel ST40, analyze the effect of pressing time variations, and identify the optimum pressing time that produces the strongest joint. The results showed that a pressing time of 20 seconds produced the highest tensile strength of 36.69 MPa, yield strength of 205.56 MPa, and modulus of elasticity of 406.85 MPa. Therefore, a pressing time of 20 seconds is considered the optimum condition to produce strong spot-welded joints on ST40 steel.
Analysis of the Hardness of AISI 4140 Steel Gears after Carbon Enrichment Using Coconut Shell Charcoal Supriadi Supriadi; Mukhnizar Mukhnizar; Veny Selviyanty
The Future of Education Journal Vol 5 No 2 (2026)
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v5i2.2158

Abstract

Carbon steel is widely used in engineering and industrial applications, particularly in machine component. One of the most important properties of steel is its strength. In addition to having good resistance to friction, steel is also required to possess adequate hardness. However, excessive hardness may lead to increased brittleness AISI 4140 steel is an  alloy steel known for its good strength and toughness, nevertheless, in certain application, it still requires improved surface hardness to enhance wear resistance and extend component service live. This study aims to analyse the hardness improvement of AISI 4140 steel gears after carbon enrichment though a carburizing process using coconut shell charcoal as the carbon source, followed by aquenching process with three different cooling media air, water and new oil. The experimental method with solid carburizing technique was applied at a temperature of 900⁰ C and a holding time of 2 hours. Hardness teting was performed using the Vickers method to determine the changes before and after treatment. The results indicate that air cooling resulted in a hardness of 226,63 HV, showing a decrease of – 1,2 % compared to untreated speciments 229.57 HV. Water cooling produced a hardness of 234,83 HV, corresponding to an increase of 234,83 HV, corresponding to an increase of 2.29 %. Meanwhile, oil cooling resulted in the highest hadness value of 239,60 HV, withan increase 436 %.
Co-Authors Afdal Afdal Arsy Sulaiman Azmil Azman Hasri Devin Irfan Putra Neida Abadia El Islami Putra Ramadhan Rahmat Hidayat Rama Pranata Risal Abu Riski Riski Supriadi Supriadi Veny Selviyanty Zulkarnain Zulkarnain