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All Journal JENIUS: Jurnal Terapan Teknik Industri Industrika : Jurnal Ilmiah Teknik Industri
Gading Adithia Famella
Universitas Singaperbangsa Karawang
Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Optimasi lot sizing dalam perencanaan kebutuhan material untuk menekan biaya persediaan PT Pelumas Kendaraan Indonesia Daffarel Lingga Nalendra; Fahriza Nurul Azizah; Gading Adithia Famella
JENIUS : Jurnal Terapan Teknik Industri Vol 7 No 2 (2026): JENIUS: Jurnal Terapan Teknik Industri
Publisher : LPPMPK - Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/jenius.v7i2.2239

Abstract

Manajemen persediaan bahan baku merupakan faktor penting dalam industri manufaktur karena berpengaruh terhadap efisiensi biaya operasional. PT Pelumas Kendaraan Indonesia mengalami peningkatan biaya persediaan akibat kebijakan pengadaan yang masih bersifat konvensional dan belum berbasis perhitungan terstruktur. Penelitian ini bertujuan menentukan metode lot sizing yang paling optimal dalam sistem Material Requirements Planning (MRP) untuk meminimalkan biaya persediaan. Pendekatan penelitian menggunakan metode kuantitatif dengan analisis komparatif terhadap teknik Fixed Order Quantity (FOQ), Lot for Lot (LFL), Least Unit Cost (LUC), dan Least Total Cost (LTC). Objek penelitian difokuskan pada produk Pelumas Mesin 1 yang memiliki karakteristik fast moving, dengan data berupa jadwal induk produksi, bill of Material, lead time, dan komponen biaya persediaan. Hasil analisis menunjukkan bahwa metode Least Total Cost (LTC) menghasilkan total biaya persediaan terendah sebesar Rp392.887.298, lebih rendah dibandingkan kebijakan aktual perusahaan sebesar Rp490.000.000, sehingga memberikan penghematan biaya sebesar Rp97.112.702 (19,8%). Temuan ini menunjukkan bahwa penerapan metode LTC dalam perencanaan kebutuhan Material mampu meningkatkan efisiensi pengendalian persediaan melalui keseimbangan antara biaya pemesanan dan biaya penyimpanan.
Reduksi Limbah Kertas dan Kardus di Kabupaten Karawang Menjadi Eko Briket Melalui Usulan Perancangan Mesin Skala Produksi Yamandito Mario Nugroho; Aksyal Abi Maulana; Gading Adithia Famella; Wahyu Fitrianto
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 3 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/eq0q5p55

Abstract

The problem of increasing waste generation in Indonesia, particularly in Karawang Regency, poses a serious environmental threat if not properly managed. One sustainable alternative is to utilize paper and cardboard waste as raw materials for eco-briquettes. This study aims to develop eco-briquette products and design a production machine capable of improving the efficiency of non-hazardous waste processing. The research method applied was experimental and engineering design. The experiment was conducted by producing several briquette samples with different compositions of paper, cardboard, and tapioca starch, which were then tested through burn duration and physical performance evaluation. The results showed that briquettes with a composition of 80% cardboard and 20% tapioca starch performed best, with a burn time of 21 minutes. Furthermore, a production system design was proposed, consisting of cutting, mixing, pressing, crushing, second mixing, and molding machines, with a production target of 100 briquettes per day. This design is projected to reduce paper and cardboard waste by approximately 1.197 tons per month. Therefore, this study demonstrates that utilizing non-hazardous waste for eco-briquette production not only provides a solution for waste reduction but also supports economic value and environmental sustainability. Keywords: Briquette, Design, Experiment, Paper, Waste  
Rekomendasi Jadwal Preventive Maintenance Mesin Gas Expander Metode Mean Time Between Failure (MTBF) dan Mean Time to Repair (MTTR) Gading Adithia Famella; Wahyudin Wahyudin; Yamandito Mario Nugroho; Daffarel Lingga Nalendra
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 4 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/jwhdta62

Abstract

The issue of frequent failures in the gas expander machine at PT XYZ has resulted in significant downtime, disrupting the production process of ammonium nitrate. This study aims to provide preventive maintenance recommendations using the Mean Time Between Failure (MTBF) and Mean Time to Repair (MTTR) methods. The research was conducted over a one-month period, from January 2 to February 2, 2025, using data collection techniques such as interviews and company document analysis. The data analyzed included machine operating hours and breakdown frequency from 2019 to 2023. The calculation results showed an MTBF value of 2,158.67 hours and an MTTR value of 32 hours. The MTBF indicates that failures occur on average every 90 operating days, while the MTTR indicates that the average repair time is 1.33 days. Based on these findings, it is recommended to perform preventive maintenance every three months. This study concludes that implementing a maintenance strategy based on MTBF and MTTR can minimize unexpected breakdowns, improve machine reliability, and support the sustainability of production processes in the explosives industry. Keywords: Gas Expander, MTBF, MTTR, Preventive Maintenance
Analisis Biaya Preventive dan Corrective Maintenance Dinamo Mesin Bubut 1 untuk Peningkatan Efisiensi Operasional PT. ABC Wahyu Fitrianto; Sukanta Sukanta; Wahyudin Wahyudin; Gading Adithia Famella
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 4 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/2rmph024

Abstract

This study aims to analyze the maintenance system of production machines at PT. ABC, a company engaged in die casting molds, plastic injection molds, precision parts, and jig fixtures. Based on failure frequency data from 2023–2025, Lathe Machine 1 was identified as the machine with the highest breakdown rate, with the dynamo component being the most critical part. To determine the optimal maintenance strategy, a reliability analysis was conducted using a lognormal distribution. The results showed that the Mean Time To Failure (MTTF) of the dynamo reached 287.87 hours, while the Mean Time To Repair (MTTR) was recorded at 3.34 hours. Based on these calculations, the optimal replacement interval was determined to be 154 hours, or approximately ±21 days, with an availability level of 0.9929 and a reliability level of 0.7617. From an economic perspective, the preventive maintenance method proved to be more cost-effective compared to corrective maintenance, offering potential cost savings of up to 61.86%. These findings highlight that the implementation of preventive maintenance not only reduces maintenance costs but is also effective in minimizing machine downtime, improving operational reliability, and ensuring smooth production processes. Therefore, preventive maintenance is strongly recommended as a key strategy to enhance operational efficiency and production sustainability at PT. ABC, while also serving as a valuable reference for future decision-making in the maintenance of critical machine components. Keywords: Age Replacement, Maintenance Cost, MTTF, MTTR
Co-Authors Aksyal Abi Maulana Daffarel Lingga Nalendra Fahriza Nurul Azizah Sukanta Wahyu Fitrianto Wahyudin Wahyudin Yamandito Mario Nugroho