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All Journal (JINSENG) Journal of Industrial Innovation and Safety Engineering
Faishal Arham Pratikno
Teknik Logistik Institut Teknologi Kalimantan
Decision Sciences, Operations Research & Management Industrial & Manufacturing Engineering Transportation

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Optimasi Pengendalian Persediaan Gas Oxygen dan Acetylene Melalui Evaluasi ROP ROQ Berbasis Forecasting di PT Kaltim Prima Coal Yovanka Syulah Pertiwi; Faishal Arham Pratikno; Melati Salma
Journal of Industrial Innovation and Safety Engineering (JINSENG) Vol 3 No `1 (2025): JINSENG Volume 3 Nomor `1 January 2025
Publisher : Fakultas Rekayasa dan Teknologi Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/jinseng.v3i`1.8481988

Abstract

This internship aims to evaluate and optimize the inventory control of industrial oxygen and acetylene gas at PT Kaltim Prima Coal, which is managed under a closed-loop system. The main issues are the mismatch between the Reorder Point (ROP) and Reorder Quantity (ROQ) parameters in the Ellipse system and actual demand fluctuations, as well as an imbalance in bottle distribution that causes stockouts in the warehouse. The solution methods include statistical analysis of historical data from 2024–2025, forecasting using Exponential Smoothing, recalculation of ROP/ROQ based on three lead time scenarios, and determination of the ideal number of cylinders using the Demand During Lead Time approach. Analysis results indicate that the best forecasting method for oxygen is Exponential Smoothing with α=0.3 (MAPE 15.86%) and for acetylene, α=0.5. Recalculations using actual lead times resulted in an oxygen ROP of 22 bottles (4-day lead time) and an acetylene ROP of 29 bottles (11-day lead time), significantly different from the existing parameters (oxygen ROP=3, acetylene ROP=0). The ideal number of bottles in the system is 95 bottles for oxygen and 91 bottles for acetylene, while the actual inventory of 103 oxygen bottles and 87 acetylene bottles indicates that the root cause is not a shortage of bottles, but rather an imbalance in distribution across cycle points. The primary recommendation is to accelerate bottle returns and even out distribution without needing to increase the total bottle inventory.
Analisis Risiko Keselamatan Kerja Awak Mobil Tangki (AMT) Pada PT XYZ Dengan Metode HIRADC dan JSA Rachel Abigail; Faishal Arham Pratikno; Melati Salma
Journal of Industrial Innovation and Safety Engineering (JINSENG) Vol 4 No 2 (2026): JINSENG Volume 4 Nomor 2 July 2026
Publisher : Fakultas Rekayasa dan Teknologi Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35718/jinseng.v4i2.8482028

Abstract

Tanker Truck Operator (AMT) is a high-risk job because it involves direct contact with flammable materials, unpredictable road conditions, and complex operational pressures. Hazards such as fires, explosions, and loss of vehicle control can have fatal consequences for both workers and the environment. This is underscored by a 2025 workplace accident involving a tanker truck due to a vehicle system failure at PT XYZ, demonstrating that sources of danger stem not only from work behavior but also from technical aspects of the equipment. This study aims to identify potential hazards, analyze risk levels before and after control measures are implemented, and determine appropriate control measures for AMT work activities at PT XYZ. The methods used were Hazard Identification, Risk Assessment, and Determining Control (HIRADC) and Job Safety Analysis (JSA), through direct observation of each stage of the activities and interviews with the HSSE Supervisor at PT XYZ. The results of the study indicate the presence of potential hazards in the gate-in, filling shed, and distribution processes, with varying risk levels. Before control measures were implemented, several risks were categorized as “very high,” including undetected vehicle damage, incomplete use of PPE, and loss of vehicle control. Control measures were implemented through the application of Pre-Trip Inspections as the primary mitigation step to significantly reduce risk levels and comprehensively protect the occupational safety of AMT personnel.
Co-Authors Melati Salma Melati Salma Rachel Abigail Yovanka Syulah Pertiwi