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Harashta, Hafidz Raif
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Controlling Raw Material Inventory for Methanol Production Using the Silver Meal Method: Pengendalian Persediaan Bahan Baku Penunjang Methanol Menggunakan Metode Silver Meal Harashta, Hafidz Raif; Aryanny, Enny
Academia Open Vol. 10 No. 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.10.2025.11651

Abstract

General background: Effective inventory control is essential for manufacturing firms to ensure operational continuity and cost efficiency. Specific background: Methanol production facilities often experience persistent overstock of supporting chemicals such as Caustic Soda Flake (NaOH) and Sulphuric Acid (H₂SO₄), resulting in increased storage costs and heightened safety risks. Knowledge gap: Prior studies predominantly apply the Silver Meal heuristic to primary raw materials, with limited evidence of its effectiveness for fluctuating supporting materials in high-risk chemical industries. Aims: This study aims to optimize supporting-material inventory using the Silver Meal method to reduce total inventory costs and improve ordering policies. Results: The method produced lower total costs—Rp 4.144.915.411 for Caustic Soda and Rp 1.096.242.822 for Sulphuric Acid—representing reductions of 4.6% and 8.5% compared to the existing approach commonly used in industry. Novelty: The study introduces the application of a heuristic lot-sizing method to hazardous supporting materials using actual operational data, demonstrating its feasibility in chemically sensitive environments. Implications: Findings provide a practical decision-support model for companies to minimize overstock, enhance operational efficiency, and mitigate safety hazards associated with chemical accumulation. Highlights: Highlights the efficiency of the Silver Meal method in reducing total inventory costs. Addresses overstock issues of hazardous supporting materials in methanol production. Provides a practical model for safer and more economical inventory management. Keywords: Inventory Control, Silver Meal, Methanol Production, Supporting Materials, Cost Optimization
Penerapan Metode EOQ Dan Min-Max Dalam Manajemen Stok Material Di Warehouse PT. Kaltim Methanol Industri Harashta, Hafidz Raif; Tranggono, Tranggono
Journal of Industrial Engineering and Operation Management (JIEOM) Vol 8, No 2 (2025)
Publisher : Universitas Islam Kalimantan Muhammad Arsyad Al Banjari Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/jieom.v8i2.17507

Abstract

Persediaan yang efektif merupakan salah satu elemen penting dalam mendukung kelancaran operasional perusahaan. Penelitian ini bertujuan untuk mengoptimalkan manajemen stok material consumable di warehouse PT. Kaltim Methanol Industri melalui penerapan metode Economic Order quantity (EOQ) dan Min-Max Inventory. Metode EOQ digunakan untuk menentukan kuantitas pemesanan yang optimal guna meminimalkan total biaya persediaan, sedangkan Min-Max Inventory membantu dalam menetapkan batas minimum dan maksimum stok untuk mencegah kekurangan atau kelebihan persediaan. Penelitian ini menganalisis data historis konsumsi material, biaya pemesanan, dan biaya penyimpanan untuk menghitung parameter optimal. Hasil penelitian menunjukkan bahwa penerapan kombinasi kedua metode ini berhasil meningkatkan efisiensi pengelolaan stok, mengurangi frekuensi pemesanan, menentukan jumlah pesanan yang optimal, serta mengoptimalkan tingkat persediaan material consumable. Implementasi sistem ini memberikan dampak positif terhadap efektivitas operasional dan penghematan biaya perusahaan.Kata Kunci: Economic Order quantity, Min-Max Inventory, Persediaan.
Co-Authors Enny Aryanny Tranggono Tranggono