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Fabrikasi Kapal Fiberglass Sebagai Bahan Alternatif Pengganti Kapal Kayu Untuk Meningkatkan Produktifitas Nelayan Di Perairan Bengkalis Pardi, P; Afriantoni, A
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 14, No 2 (2017): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Ketersediaan material kayu sebagai bahan baku kapal nelayan saat ini semakin menipis. Hal ini menjadi masalah yang serius bagi sebagian besar masyarakat kabupaten Bengkalis yang berprofesi sebagai nelayan. Oleh karena itu dalam penelitian ini memberikan solusi secara ilmiah untuk menggunakan bahan alternatif fiberglass sebagai bahan dasar fabrikasi kapal nelayan. Penelitian ini membahas tentang cara fabrikasi kapal fiberglass yang efektif dengan ukuran utama sebagai berikut : Lpp = 7,798m, B=1,575m, H=0,678m, T=0,4m dan Cb=0,449. Gambar desain yang digunakan untuk fabrikasi adalah gambar rencana garis (lines plan) dan gambar rencana umum (general arrangement). Langkah awal proses fabrikasi adalah membuat cetakan positif menggunakan material kayu dan multiplek. Cetakan positif lambung kapal mengikuti bentuk body kapal disesuaikan dengan gambar rencana garis setiap station. Sebelum proses laminasiÂ dilakukan menggunakan material resin, serat glass (matt), woven roving(WR), katalis dan tepung aerosil cetakan diberi mirorglass untuk mempermudah pelepasan hasil cetakan. Ketebalan yang digunakan pada pembuatan lambung kapal ini adalah sekitar 6 mm atau 6 layer. Setelah lambung selesai dilaminasi kemudian dibuat gading (frame) memanjang dan melintang sesuai dengan desain gambar general arrangement. Sekat dan bangunan atas dibuat bentuknya menggunakan multiplek 12 mm kemudian dilaminasi menggunakan fiberglass untuk memperkuat dan menghindari kerusakan karena faktor air laut.

ANALYSIS OF COAL QUALITY IMPROVEMENT USING CHEMICAL METHODS FOR MEETS STANDARDS OF CALORIFIC VALUE Nahar, N; Ridwan, R; Irwan, I; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.5423

As a country with relatively large coal resources and reserves, Indonesia will face challenges that are not easy in the future. The large amount of coal resources and reserves as well as the continuity of the coal mining industry cannot be ignored. Coal consumption in the world is expected to continue from time to time, especially in the Asian region. Lignite coal reserves account for around 48% of total coal reserves in the world, meanwhile in Asia lignite coal reserves reach 30%, while in Indonesia they reach 60% of total coal reserves. Although the amount of lignite coal consumed accounts for around 30% of total world coal production. The amount consumed in Asia accounts for only 10% of its total coal production. Especially in Indonesia, mining practices tend to tend to be higher quality bituminous and sub-bituminous coal which is more widely mined and produced because producing lignite coal is less economical and cannot meet market criteria. Thus, it can be predicted that what will remain in the future will be a large amount of lignite coal reserves that cannot be utilized. Because the opportunity to fill the potential of the coal market is still wide open, whether used directly as an energy source in power plants or exported abroad, promotion of the use of lignite coal must be made as early as possible as a very important issue for Indonesia. To improve the quality of lignite coal to coal whose quality is like that of anthracite coal so that it can be used, therefore it is necessary to have technology to improve the quality of lignite coal, so the Industrial Innovation Research research will improve the quality of coal using the stirring method by varying the influence of temperature and mixing time. coal, residual oil and kerosene can reduce the water content contained in low rank coal by the adsorption process. The research results show that operating conditions greatly influence the distribution of coal products. Relatively good operating conditions were obtained at a temperature of 200o C and a reaction time of 70 minutes with the results of: oil: 25 ml, water content: 0.668%, ash content: 11.883%, volatile matter: 30.122%, fixed carbon: 57.377%, and calorific value : 6581 Kcal/kg. Key words: Coal; Quality; Kerosene; Calorific Value; Enhancement

ANALYSIS OF COAGULANT NEEDS AND OPERATIONAL COSTS IN THE WATER PURIFICATION PROCESS ON CLARIFIER (Z-9451) IN THE UTILITY UNIT OF PT PERTA ARUN GAS LABORATORY SCALE USING THE JAR TEST METHOD Mahrizal, M; Elfiana, E; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6146

ABSTRACTThis study discusses the analysis of coagulant needs and operational costs in the water purification process on the clarifier (Z-9451) in the utility unit of PT Perta Arun Gas on a laboratory scale using the jar test method. This research is expected to provide benefits in improving the efficiency of chemical use, producing water quality that meets standards and estimating operational costs. This study aims to test the effectiveness of coagulants using jartest on clarifier inlet water samples at PT Perta Arun Gas. The parameters tested include pH, turbidity, and conductivity. Experiments were carried out with variations in the doses of coagulants and polymers. The results of the experiment will be used to determine the optimal dose of coagulant for raw water treatment. The best efficiency In the first week of November 7, 2023, the results of the analysis of the clarifier feed raw water (Z-9451) were obtained, namely a decrease in turbidity of 98.74%. In the second week of November 14, 2023, the decrease in turbidity was 98.42%, in the third week of November 21, 2023, the decrease in turbidity was 98.33%, and in the last week of November 28, 2023, the decrease in turbidity was 98.50%. The results showed the best efficiency in the first week with a concentration of aluminum sulfate of 24 ppm and polymer 0.20 ppm. The use of this concentration is able to produce good water quality and save the company's operational costs. However, weather conditions can affect the quality of raw water, so further research is needed to obtain the optimal conditions for the addition of aluminum sulfate and polymer. It is recommended to conduct a weekly Jartes analysis in order to provide recommendations on the use of aluminum sulfate and polymers as coagulants in utility units. Keywords : Aluminium Sulfat, Clarifier , Jartest, Koagulan, Polymer, Turbidity

APPLICATION OF BIODRYING TECHNOLOGY IN THE PROCESSING OF BRIQUETTES FROM ORGANIC WASTE IN LHOKSEUMAWE CITY Nurkuzaifi, Muhammad; pardi, p; Putra, Alfian
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6094

ABSTRACT Waste is unwanted waste material after the end of a certain process. There are various processes that can be applied to produce dry waste using biodrying technology. The purpose of this study is to study biodrying technology for the processing of organic waste in Lhokseumawe City to become briquettes and the length of the biodrying process on the quality of briquettes produced from EM4 variations. This study used two independent variables, namely 14 and 21 days of biodrying process and EM4 variations, namely 100 ml, 200 ml, 300 ml, 400 ml and 500 ml. The results of this study show that those that meet the SNI No.1/6235/2000 standard are only ash content testing, volatility content and flame length test, while the moisture content test does not meet SNI No.1/6235/2000 standard.Keywords: Organic waste, biodrying and SNI No.1/6235/2000.

The Effect of Audit Fee, Audit Rotation, and Auditor Reputation on Audit Quality (Empirical Study on Manufacturing Companies Listed on the Idx for the Period 2014-2018) Nursiam, N; Febry Krisna Putri; Pardi, P
Riset Akuntansi dan Keuangan Indonesia Vol 6, No 2 (2021) Riset Akuntansi dan Keuangan Indonesia
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/reaksi.v6i2.16124

The purpose of this research is to examine the effect of audit fees, audit rotation, and auditor reputation on audit quality. The population in this study is manufacturing companies listed on the IDX period 2014-2018. The total sample of research is 345 companies determined by purposive sampling. Data analysis was done by logistic regression and SPSS Statistic 20. The result of this study shows that audit fee does not affect audit quality, while audit rotation and auditor reputation have a significant effect on audit quality.

ANALYSIS OF COAL QUALITY IMPROVEMENT USING CHEMICAL METHODS FOR MEETS STANDARDS OF CALORIFIC VALUE Nahar, N; Ridwan, R; Irwan, I; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6331

ABSTRACT As a country with relatively large coal resources and reserves, Indonesia will face challenges that are not easy in the future. The large amount of coal resources and reserves as well as the continuity of the coal mining industry cannot be ignored. Coal consumption in the world is expected to continue from time to time, especially in the Asian region. Lignite coal reserves account for around 48% of total coal reserves in the world, meanwhile in Asia lignite coal reserves reach 30%, while in Indonesia they reach 60% of total coal reserves. Although the amount of lignite coal consumed accounts for around 30% of total world coal production. The amount consumed in Asia accounts for only 10% of its total coal production. Especially in Indonesia, mining practices tend to tend to be higher quality bituminous and sub-bituminous coal which is more widely mined and produced because producing lignite coal is less economical and cannot meet market criteria. Thus, it can be predicted that what will remain in the future will be a large amount of lignite coal reserves that cannot be utilized. Because the opportunity to fill the potential of the coal market is still wide open, whether used directly as an energy source in power plants or exported abroad, promotion of the use of lignite coal must be made as early as possible as a very important issue for Indonesia. To improve the quality of lignite coal to coal whose quality is like that of anthracite coal so that it can be used, therefore it is necessary to have technology to improve the quality of lignite coal, so the Industrial Innovation Research research will improve the quality of coal using the stirring method by varying the influence of temperature and mixing time. coal, residual oil and kerosene can reduce the water content contained in low rank coal by the adsorption process. The research results show that operating conditions greatly influence the distribution of coal products. Relatively good operating conditions were obtained at a temperature of 200o C and a reaction time of 70 minutes with the results of: oil: 25 ml, water content: 0.668%, ash content: 11.883%, volatile matter: 30.122%, fixed carbon: 57.377%, and calorific value : 6581 Kcal/kg.Key words: Coal; Quality; Kerosene; Calorific Value; Enhancement

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