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INDONESIA
Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 478 Documents
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Perlakuan panas baja df-2 terhadap kekuatan puntir Ramli Ramli
Jurnal POLIMESIN Vol 1, No 1 (2003): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v1i1.1392

Abstract

Penelitian ini bertujuan untuk mengetahui sejauh mana penurunan atau peningkatan kekuatan puntir terhadap perlakuan panas dengan holding time yang berbeda-beda. Sampel dibuat dari baja DF-2 dengan diameter16 mm, dibuat berdasarkan standar ASTM melalui pembubutan dan pengefraisan, sebanyak 25 buah. 20 buah sampel dibagi secara acak 4 bagian, dipanaskan di dalam oven dengan suhu pemanasan awal 200°C dipertahankan selama 5 menit, 10 menit, 15 menit dan 20 menit, kemudian suhu dinaikkan 650°C dan dipertahankan sesuai waktu pertama, selanjutnya didinginkan dengan oli SAE 30, dan diuji kekuatan puntir. Hasil penelltlan menunjukkan bahwa perlakuan panas (holding time) yang berbeda sangat berpengaruh nyata  terhadap kuat puntir.
Clove oil additives in vegetable oil: an assessment of fuel properties Adhes Gamayel
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.5207

Abstract

Vegetable oil, obtained from plants such as coconut or Jatropha curcas, serves as a valuable renewable energy source. Nonetheless, it presents certain limitations in comparison to diesel fuels, namely, low volatility and high viscosity. One straightforward approach to overcome these limitations is the addition of high-volatility oil and low-viscosity oil. In this study, we incorporated 10% clove oil into coconut oil and Jatropha curcas oil. Fuel properties, including density, viscosity, flash point, and heating value, were measured in accordance with international standards. Additionally, Thermogravimetric Analysis (TGA) testing was performed to detect decomposition during the heating process. The findings indicated that the addition of clove oil increases density (from 0.922 g/ml to 0.934 g/ml), while other properties decrease, such as viscosity (from 30.12 cst to 27.7 cst), flash point (from 286°C to 182°C), and heating value (from 37.1 MJ/kg to 35.8 MJ/kg). TGA demonstrated that the inclusion of clove oil resulted in increased decomposition within the temperature range of 200°C–400°C, suggesting that clove oil falls into the category of medium-volatile oils. Although the addition of clove oil were able to modify the fuel properties of vegetable oil, it did not align with the characteristics of conventional diesel fuel and necessitates further modification for practical implementation
Perawatan pada labyrintperawatan pada labyrinth kompresor sentrifugal kawasaki k-2501 a dengan metode failure mode and effect analysis (FMEA) dI PT. Arun Ngl Blang Lancang Saifuddin Saifuddin; A. Jalil; Fitri Arlena
Jurnal POLIMESIN Vol 14, No 1 (2016): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v14i1.299

Abstract

Sesuai dengan perkembangan industri pada saat sekarang ini, banyak diciptakan peralatan dan alat bantu yang dapat mempercepat proses kerja suatu industri, diantaranya adalah kompresor.Kompresor sentrifugal kawasaki beroperasi pada unit 88 yang terdiri dari motor listrik sebagai penggerak. Kompresor sentrifugal kawasaki K-2501 A adalah jenis kompresor sentrifugal yaitu kompresor dengan kedudukan poros horizontal yang berfungsi untuk untuk menaikkan tekanan gas untuk keperluan tertentu atau dengan kata lain kompresor meningkatkan energi (head) fluida gas yang mengalir dari level energi tertentu ke level energi yang lebih tinggi. Dalam dunia industri kompresor mempunyai kegunaan yang sangat luas seperti dalam bidang perminyakan, petrokimia workshop, dan lain-lain.hasil analisadata lapangan, terdapat beberapa item yang mengalami kerusakan seperti Labyrinth, o ring , dan impellerpada Kompresor sentrifugal K-2501 A yang mengakibatkan kompresor harus dilakukan breakdown maintenance. Adapun tujuan penulisan skripsi ini adalah untuk memaksimalkan umur pakai komponen dari sebuah kompresor dengan menganalisa kompresor tersebut menggunakan metode FailureMode Effecy And Analysis (FMEA).Kata kunci : kompresor sentrifugal, failure Mode and Effect Analisys (FMEA)
Scientific literature reviews; Investigating analysis of turbine blade operational failure Riki Effendi; Franka Hendra
Jurnal POLIMESIN Vol 21, No 4 (2023): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i4.2899

Abstract

As a source of energy in industry and power plants, turbines must have reliability in operation.. One that affects the performance of the turnin is the condition of the blades. The multi-cycle fatigue experienced by the blades of compressors and turbines caused by dynamic stresses caused by the vibration and resonance of the blades in the engine operating time is a common type of failure. Over the past five decades, researchers have studied and investigated turbine blade failure. The main purpose of this article is to provide a brief overview of recent studies on turbine blade failure. The author only focuses on describing some of the failure methodologies used in various studies to investigate turbine blades. This article discusses each of these factors in more detail
Modification of polyurethane coating based on palm oil with filler bentonite to improve heat resistant properties Teuku Rihayat; Shafira Riskina; Adi Saputra Ismy
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1655

Abstract

This work aims to prepare and characterize polyurethane nanocomposite sequences modified with bentonite as fillers and palm oil as a soft segment component while Toluene Diisocyanate (TDI) was chosen as a hard segment component. Bentonite fillers are needed to provide heat resistance to the polyurethane coating. Morphological, structural and thermal polyurethane nanocomposites are characterized by SEM, FTIR, and TGA. FTIR analysis is the NH urethane group in palm oil polyurethane compounds while the absorption of C=O urethane group widens at 1735 cm-1. While the CH group occurs at absorption wavelengths of 2120-2180 cm-1, adding bentonite (7% by weight) is completely laminated and well dispersed in the form of a mixture of peeling / intercalating layers in the polymer matrix. Polyurethane nanocomposites have a morphology separated by clearer microphase. The resulting thermal stability is higher compared to the addition of bentonite 3 and 5% by weight. Because of its enhanced features, the polymer developed can be considered a material with heat resistance as a coating.
Pengaruh jenis elektroda pengelasan SMAW terhadap sifat mekanik material SS400 Azwinur Azwinur; Muhazir Muhazir
Jurnal POLIMESIN Vol 17, No 1 (2019): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v17i1.870

Abstract

Elektroda yang digunakan pada pengelasan SMAW mempunyai perbedaan komposisi selaput maupun kawat Inti. kuat arus dan komposisi kimia ini dapat mempengaruhi sifat mekanik pada sambungan material hasil pengelasan yang berdampak pada kekuatan dan ketangguhan sambungan pengelasan. Setiap proses pengelasan pasti berhubungan dengan elektroda oleh karena itu pemilihan jenis elektroda sangat penting sebelum melakukan proses pengelasan. Penelitian ini bertujuan untuk mengetahui pengaruh jenis elektroda terhadap sifat mekanik material SS400 dengan menggunakan proses pengelasan SMAW. Material SS400 diberi perlakuan pengelasan dengan variasi jenis elektroda yaitu E7010-P1, E7016 dan E7018. Dari hasil penelitian maka dapat dijelaskan bahwa jenis elektroda berpengaruh terhadap sifat mekanik material dimana nilai kekuatan tarik yang paling tinggi terdapat pada jenis elektroda E7018 yaitu sebesar 46.73 kgf/mm2  selanjutnya diikuti oleh elektroda E7016 yaitu sebesar 46.57 kgf/mm2 dan terakhir dengan nilai terendah menggunakan elektroda E7010-P1 yaitu sebesar 46.49 kgf/mm2. Nilai pengujian bending pada root bend yang paling tinggi adalah pada elektroda E7016 sebesar 38.87 Kgf.mm2, selanjutnya diikuti oleh elektroda E7018 yaitu sebesar 31.50 kgf.mm2 dan terakhir dengan nilai terendah menggunakan elektroda E7010-P1 yaitu sebesar 29.88 kgf.mm2. Nilai pengujian bending pada face bend yang paling tinggi adalah pada elektroda E7010-P1 sebesar  32.78 Kgf.mm2, selanjutnya diikuti oleh elektroda E7016 yaitu sebesar 31.60 kgf.mm2 dan terakhir dengan nilai terendah menggunakan elektroda E7018 yaitu sebesar 26.09 kgf.mm2.Kata Kunci: SMAW, Elektroda, Sifat Mekanik, Material SS400  AbstractElectrodes used in SMAW welding have different coating compositions and core wire. current strength and chemical composition can affect the mechanical properties of the welded material connection which has an impact on the strength and toughness of the welding joint. Each welding process must be related to the electrode, therefore the choice of electrode type is very important before carrying out the welding process. This study aims to determine the effect of electrode types on the mechanical properties of SS400 materials using the SMAW welding process. SS400 material was given a welding treatment with various types of electrodes namely E7010-P1, E7016 and E7018. From the results of the study, it can be explained that the type of electrode affects the mechanical properties of the material where the highest tensile strength is found on the type of electrode E7018 which is equal to 46.73 kgf / mm2 followed by the E7016 electrode which is 46.57 kgf / mm2 and the lowest with the electrode E7010-P1 which is equal to 46.49 kgf / mm2. The highest bending bend test value at E7016 electrode is 38.87 Kgf.mm2, followed by E7018 electrode which is equal to 31.50 kgf.mm2 and finally with the lowest value using E7010-P1 electrode which is 29.88 kgf.mm2. The highest face bend bending test value is at E7010-P1 electrode of 32.78 Kgf.mm2, followed by E7016 electrode which is equal to 31.60 kgf.mm2 and finally with the lowest value using E7018 electrode which is equal to 26.09 kgf.mm2.Keywords: SMAW, Electrodes, Mechanical Properties, SS400 Material
A study of co-firing palm kernel shell on the Nagan Raya coal-fired power plant Khairil Ansar; Ahmad Syuhada; Sarwo Edhy Sofyan
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4021

Abstract

Co-firing biomass with coal in existing utility boilers is seen as one strategy for promoting renewable energy with low upfront costs and little to no impact on the boilers' high efficiency. The purpose of this research is to analyse the fuel characteristics and performance of palm kernel shell co-firing at Nagan Raya Coal-Fired Power Plant (CFPP) at various percentages of palm kernel shell combination. The analysis is conducted based on the operational data obtained from Nagan Raya Power Plant. In this study, the characteristics of fuel and the performance of a power plant are analysed based on percentages of fuel variations, namely 100% coal, 95% coal-5% palm kernel shell, and 90% coal-10% palm kernel shell. The results reveal that co-firing's biomass ratio boosted operation parameters, including main steam pressure, temperature, and flow rate. Subsequently, co-firing with 90% coal-10% palm kernel shell has enhanced the power plant output to 90,7 MW compared to those with 100% coal, 95% coal-5% palm kernel shell, namely 89,3 MW and 90,4 MW, respectively
Study on improving thermal and compatibility behavior of gypsum PLA/stearic-lauric acid composite as phase change material Nurhanifa Aidy; Rozanna Dewi; Azhari Azhari; Teuku Rihayat; Aida Safitri; Adi Saputra Ismy
Jurnal POLIMESIN Vol 19, No 2 (2021): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i2.2278

Abstract

Commercial buildings, one of which is for hospitality, consumes a large amount of energy. The energy needs are generally dominated by lighting systems, domestic hot water systems and air conditioning systems. Energy consumption in commercial buildings and residential use of 35.3% of the total global energy use. The aim of this study is to investigate thermal properties and chemical compatibility of PCM based eutectic fatty acid (lauric-stearic) combined with polylactic acid in the pores of the gypsum that was established using the vacuum impregnation method. The procedure ensures that pla 1.5% and 2% with Lauric-Stearic (LA-SA) are mixed evenly, compared with pure gypsum and LA-SA addition. Based on TGA test  specific lauric acid and stearic acid heat analysis was performed in the modulated tga mode between 90.34oC and 369.51oC. The degradation material decreased significantly at -3.404 mg. Sample mixed between Poly lactid acid, eutectic fatty acid and gypsum  contain hydroxyl groups with significant absorptions for ft-ir analysis. The bonded oxygen-hydrogen stretching vibrations of lactid acids and gypsum,  range between 2000 and 3000 cm-1. Similarly, alcohols exhibit similar shapes at higher wavenumbers ranging from 3230 to 3550 cm-1.
Alternatif pengunaan minyak sawit untuk bahan baku pembuatan polimer uretan Mukhtar ali Ali
Jurnal POLIMESIN Vol 8, No 1 (2010): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v8i1.1338

Abstract

Tulisan ini merupakan bagian pertama dari dua tulisan, dimana pada bagian pertama ini akan membicarakan tentang sintesa polyol yang berasal dari minyak kelapa sawit. Polyol ini selanjutnya akan direaksikan dengan isosinat (isocyanate) untuk membentuk poliuretan, yang akan dipaparkan pada bagian kedua. Poliuretan adalah salah satu jenis polimer yang popular, saat ini konsumsinya baik sebagai bahan dasar ataupun produk akhir termasuk lima besar didunia. Polimer ini dapat dibentuk sebagai, foam, elastomers, pembungkus (packaging), alat-alat olahraga, bahan-bahan penganti kulit, hingga sebagai bahan baku pembuatan cat dan juga sebagai perekat, seperti tujuan penelitian ini. Pada penelitian ini, kami mendapatkan suatu hal yang menarik bahwa ternyata dodecylbenzene sulfonic acid (DBSA) selain bertindak sebagai emulsifier juga bertindak sebagai katalis, dimana sebelum ini DBSA banyak digunakan hanya sebagai emulsifier. Dalam penelitian ini kami mengunakan Tosoh-Gel Permeation Chromatography (GPC) untuk menghitung berat molekul dan Perkin-Elmer, Fourier Infrared Spectroscopic (FTIR) untuk menentukan struktur group. Hasil penelitian yang diperoleh dengan mengunakan alat FTIR adalah struktur OH terdapat pada peak 3384.940, dimana nilai OH secara literatur adalah antara 3370-3470. Sedangkan berat molekul yang diperoleh dengan mengunakan GPC adalah 954, dimana secara literature nilai tersebut adalah antara 250 sampai 2500Kata Kunci : Poliuretan, poliol, minyak kelapa sawit, sintesa
Optimization Of Gas Turbine Performance 2.1 Using the Overhaul Combustion Inspection Method Susilo Handoko; Hendra Hendra; Hafid Suharyadi; Totok Widiyanto
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4221

Abstract

Gas turbines are one type of internal combustion drive, the initial mover utilizes gas combustion as a fluid to rotate the turbine with internal combustion. Gas turbines at private companies producing electricity use the initial movers, namely gas turbines and steam turbines. Therefore, it is also called the "Steam Gas Power Plant/PLTGU.”Private company especially in Block 2, uses two gas turbine units with Mitsubishi GT 2.1 specifications which are used as the initial drive of the generator. Types of overhauls in gas turbines are divided into three, including turbine inspection, combustor inspection, and major inspection. In maintaining the reliability of the GT 2.1 Gas Turbine, an overhaul combustion inspection was carried out in the combustion chamber because there was an increase in heat rate of 17,9% which caused a decrease in thermal efficiency and net turbine power of the GT 2.1 Gas Turbine by 17% and 2,1%. So that steps are taken to optimize the GT 2.1 Gas Turbine with the combustion inspection method by repairing and cleaning the combustion bucket nozzle. Increased thermal efficiency by 27,8% or 27,13% to 36,01% from data before overhaul. This was also followed by an increase in compressor power and turbine power so that the net turbine power increased by 38% or 141339,35 hp to 195246,54 hp. 

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