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All Journal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Jurnal Ilmu Komputer dan Sistem Informasi Bulletin of Engineering Science, Technology and Industry Indonesian Journal of Global Health Research
Felixtianus Eko Wismo Winarto
Universitas Gadjah Mada
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Library & Information Science

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Inventory Management and Proactive Maintenance to Enhance Operational Efficiency in Excavators: Focus on Common Spare Parts Issues Surojo; Widia Setiawan; Harjono; Nugroho Santosa; Felixtianus Eko Wismo Winarto; Wirawan Widya Mandala
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7770

Abstract

Effective inventory management and maintenance are critical for the operational efficiency of heavy equipment such as excavators. This study focuses on optimizing spare parts inventory for Cummins diesel engines using the min-max stock method. It aims to improve inventory control by categorizing spare parts into slow-moving, medium-moving, and fast-moving components and addressing maintenance issues that impact performance. The research utilized the min-max stock method to determine optimal inventory levels, ensuring spare parts availability while minimizing holding costs. Key maintenance issues in components such as track shoes, cam shafts, rear shafts, motor starters, and exhaust manifolds were identified through inspections. Advanced diagnostic tools, including vibration analyzers and thermal imaging, were used for proactive maintenance. The study identified critical wear and damage in components like track shoes, cam shafts, and exhaust manifolds, which could lead to equipment failure if not addressed. Implementing the min-max stock method helped reduce stockouts and overstocking, ensuring an optimal balance in inventory. The results demonstrate that integrating the min-max stock method with systematic maintenance practices significantly improves operational efficiency. The use of real-time diagnostic tools enabled early issue detection, reducing downtime and maintenance costs. This study emphasizes the importance of inventory optimization, regular inspections, and timely maintenance interventions for enhancing equipment reliability. Future research should explore predictive maintenance technologies to further refine inventory and maintenance strategies in the heavy equipment sector.
Implementasi Sistem QR Code Dalam Meningkatkan Tingkat Kepatuhan Pengisian Checklist Pemeriksaan Kendaraan Harian di PT XYZ: Studi Komparatif Sebelum dan Sesudah Penerapan Muhammad Helmy Ilhamsyah; Felixtianus Eko Wismo Winarto; Lilik Dwi Setyana; Nur Rokhman
Jurnal Ilmu Komputer dan Sistem Informasi Vol. 5 No. 2 (2025): Mei 2026
Publisher : LKP Unity Academy

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70340/jirsi.v5i2.426

Abstract

Daily vehicle inspection is an important component of risk control in occupational safety and health (OSH) management systems. However, manual inspection processes often result in low compliance in checklist completion, reporting delays, and limited monitoring capabilities. This study aims to analyze the effect of implementing a QR Code system on the compliance level of daily vehicle inspection checklist completion at PT XYZ. The study employed a quasi-experimental design with a one-group pretest-posttest approach involving 35 operational vehicles. Data were collected from vehicle inspection checklists before and after the implementation of the QR Code system and analyzed using descriptive and inferential statistics through a paired sample t-test. The results showed that the compliance level increased from 72.2% before implementation to 90.2% after the implementation of the QR Code system. Statistical testing indicated a significant difference in compliance levels before and after implementation with t(34)=26.7 and p<0.001. An effect size value of 4.52 indicated a very large effect on compliance improvement. The implementation of the QR Code system proved effective in improving checklist completion, strengthening monitoring processes, and supporting the digitalization of occupational safety and health management systems in operational environments.
COCONUT PLANTATION FIRES: A REVIEW OF DRIVERS, IMPACTS, AND MITIGATION STRATEGIES Felixtianus Eko Wismo Winarto; Diki Bima Prasetio; Bambang Hari Priyambodo
Bulletin of Engineering Science, Technology and Industry Vol. 4 No. 2 (2026): June
Publisher : PT. Radja Intercontinental Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.21338469

Abstract

Fires in coconut plantations, especially on tropical peatlands, cause serious environmental and economic problems. While most studies focus on oil palm, this literature review summarizes the causes, impacts, prevention methods, and restoration strategies specific to coconut plantations. The review shows that fires are mainly triggered by cheap land-clearing practices and the accumulation of dry wastes like husks and fronds, which become highly flammable during El Niño droughts and over-drainage. These fires cause direct palm mortality, reduce crop yields for up to three years, cause peat subsidence, and generate dangerous smoke haze that harms public health. To prevent these fires, strategies like proper water management, community involvement, and satellite or drone monitoring are essential. For post-fire recovery, maintaining the surviving coconut canopy and using coconut fiber as mulch offer cost-effective ways to restore soil and biodiversity. In conclusion, managing fires requires a combination of better waste management, water control, and active community participation.
Enhancing Heat Recovery Steam Generator Integrity: A Fitness-For-Service Approach using ASME FFS-1/API 579 for Remaining Life Assessment Danang Priambada; Felixtianus Eko Wismo Winarto; Benidiktus Tulung Prayoga; Nur Rokhman; Nia Fararid Askar; Diki Bima Prasetio
Indonesian Journal of Global Health Research Vol. 8 No. 2 (2026): Indonesian Journal of Global Health Research
Publisher : GLOBAL HEALTH SCIENCE GROUP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37287/ijghr.v8i2.866

Abstract

Assessment of the remaining life of a Heat Recovery Steam Generator (HRSG) that has been in operation for 24 years is crucial to ensure operational reliability, with the ASME FFS-1/API 579 standard as the primary reference. Analyze the material condition and assess the remaining life of HRSG Unit 2 based on the ASME FFS-1/API 579 standard. Data were collected through Non-Destructive Testing (UTM, LPT, MPT, UFD), visual inspection, borescope examination, and in-situ metallurgical tests to obtain microstructure and hardness profiles. The analysis was conducted by comparing inspection results with design specifications, evaluating microstructural changes, assessing hardness degradation, calculating remaining wall thickness, and performing fitness-for-service assessment according to ASME FFS-1/API 579. No significant cracks were found, but there was material thinning of up to 16.6% in some areas. The material condition is still good and meets design standards. The estimated remaining operational life is 10–15 years. HRSG Unit 2 is declared safe and reliable to operate. The ASME-based assessment method has been proven effective for estimating the remaining life and supporting a risk-based maintenance strategy.
Co-Authors Bambang Hari Priyambodo Benidiktus Tulung Prayoga Danang Priambada Diki Bima Prasetio Harjono Lilik Dwi Setyana Muhammad Helmy Ilhamsyah Nia Fararid Askar Nugroho Santosa Nur Rokhman Setiawan, Widia Surojo Wirawan Widya Mandala