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All Journal JENIUS: Jurnal Terapan Teknik Industri Industrika : Jurnal Ilmiah Teknik Industri
Daffarel Lingga Nalendra
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.
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
Co-Authors Fahriza Nurul Azizah Gading Adithia Famella Wahyudin Wahyudin Yamandito Mario Nugroho