Recent in Engineering Science and Technology

Wire Rope Sling Failure Analysis: Technical Root Causes, Investigation Methodology Critique, and Lessons for Lifting Safety and Organizational Learning

Ahmad Zaky, Yudha Pratesa, Johny Wahyuadi Mudaryoto — Mon, 14 Jul 2025 00:00:00 +0000

Wire rope slings are critical in heavy lifting operations, yet their failure remains a persistent safety concern. This paper presents a case study of a catastrophic sling rupture that occurred during a heavy lifting trial, despite the lift being within its rated capacity. A multi-faceted failure analysis identified hidden corrosion fatigue at the sling’s ferrule and an unanticipated extreme overload condition as the primary technical root causes. Procedural and organizational factors—including inadequate risk assessment, deviation from critical lift protocols, and failure to act on prior lessons—also contributed to the incident. The contractor’s investigation is critically reviewed against best-practice Root Cause Analysis guidelines, highlighting both strengths and gaps in its methodology. Key lessons to improve lifting safety are discussed, such as implementing rigorous inspection and retirement criteria for aging slings and ensuring comprehensive lift planning. Overall, the case underscores the importance of robust investigation practices and effective organizational learning to prevent similar failures in the future.

The Use of Mixture of Myrmecodia Pendans and Piper Crocatum as Green Corrosion Inhibitor on Chemical Cocktails Inhibitor Type for API 5L Grade B Steel Corrosion Protection in 3.5% NaCl Environmental

Rani Kusumawardani, Agus Budiono, Johny Wahyuadi Soedarsono, Yudha Pratesa — Wed, 16 Jul 2025 00:00:00 +0000

Method to prevent the corrosion during pipeline hydrotest using seawater is generally by the addition of inorganic inhibitor containing corrosion inhibitor agent, oxygen scavenger and biocide, so that require to find out the alternative eco-friendly materials with better performance. The main objective of this study is to investigate the efficiency of the use of mixture of extract of Myrmecodia pendans and Piper crocatum as an alternative of eco-friendly inhibitor for reducing the use of inorganic inhibitors for corrosion protection of steel material API 5L Grade B in 3.5% NaCl. The corrosion inhibition ability of natural ingredient extraction are investigated by using tafel polarization test and EIS and verified by weight loss test. The content of the active compounds in natural ingredient extraction along with adsorption compound on metal surfaces and inhibition mechanism are investigated by EIS, FTIR and adsorption isotherm model. In the mixed green inhibitor concentration of 2 ml Myrmecodia pendans and 1 ml Piper crocatum is resulted in approximately 73.66% inhibitor efficiency while concentration of 1 ml chemical cocktail and 2 ml green inhibitor are significantly reduce the corrosion rate from 0.42 mm/year to be 0.03 mm/year with approximately 93.15% inhibitor efficiency. The green inhibitor affected the cathodic as well as the anodic polarization curves which were known as mixed corrosion inhibitor type. The adsorption of compounds contained in the Myrmecodia pendans and Piper crocatum on a metal surface are occur spontaneously follows the Langmuir adsorption isotherm.

The Remanufacturing of Track Rollers Requires The Application of A Hardfacing Technique, Which is Achieved by Combining Buttering with 309LMo Gas Metal Arc Welding (GMAW) and The TiC-O Flux-core Arc Welding (FCAW) Process

Addin Aristotika, Winarto, Sabandi Ismadi, Eddy S. Siradj, Muhammad Anis — Fri, 18 Jul 2025 00:00:00 +0000

The operation of the track rollers is dependent on the frictional forces between the rollers and the track. Furthermore, the presence of moisture-laden sand and mud in the surrounding environment accelerates the corrosion process, leading to a synergistic effect on abrasion wear. The production of new rollers is a highly energy-intensive process, resulting in the emission of significant quantities of carbon dioxide. The main objective of this research was to develop a process for remanufacturing track rollers by integrating hardfacing methods, specifically, combining buttering with gas-metal-arc welding (GMAW) that utilizes 309LMo and flux-core arc welding (FCAW) employing TiC-O. During the GMAW process, currents of 180 A, 220 A, and 260 A were applied at the same time as wire with a diameter of 1.2 mm, whereas the FCAW process involved using currents of 200 A, 250 A, and 300 A in conjunction with a wire with a diameter of 1.6 mm. An evaluation was conducted through mechanical tests and metallurgical analysis to determine the effect of the variable current on the physical and mechanical properties of the hardfill layer. Mechanical tests using the Rockwell method and metallurgical analysis via morphological observation were conducted to assess the performance of the remanufactured track roller. The outcomes revealed that as the current increase in GMAW/FCAW welding, the hardfacing layer became increasingly stiffer, but this effect was offset by the failure of the hardfacing interface to bond correctly, as shown by its insufficient fusion and the formation of cracks and holes that penetrated into the base metal. This study highlights the importance of welding parameters to achieve a balance between hardness in the base and weld metals, diffusion, and the quality of the bond between the two, as a practical and cost-efficient method for the remanufacturing industry.

Climate Change in Indonesia: Green Steel

Nicholas Standish — Thu, 31 Jul 2025 00:00:00 +0000

Most studies of Indonesian Green House Gas (GHG) emission deal with land, forestry, electricity and construction, and exclude iron and steelmaking as such, which emits a sizeable 2.75t CO₂equivalent/ton of steel. This paper focuses on GHG emissions of Indonesian iron and steel industry, now existing and under construction - and that projected to 2060. It gives actual steps of how to start reducing the industry’s GHG immediately using charcoal and employ ordinary people in environmental plantations and help poor people in towns and villages to earn some money by buying wood cuttings from them and processing it in distillation plants. It considers Indonesian ways and culture. There is no modelling of any process and activity, so everything can be checked from first principles or by reference to the source.One contentious conclusion is that to reduce the steel industry’s GHG to near zero, it is imperative to use nuclear energy. Its use in Indonesia has been committed to by President Prabowo at the G20 Summit in Brazil in November 2024 and its actual start with 28 reactors was announced the following month (December 2024). This elicited immediate protests with a slogan of: “Indonesia bukan Chernobyl”. A useful response by the government could be: Kami sangat setuju. Kami juga orang Indonesia. Sebab itu kita akan membangun reaktor gas Mitsubishi karena sama sekali reaktor tsb tidak mungkin meleleh seperti reaktor Chernobyl.

Sugarcane Bagasse as Green Fuel and Reducing Agent for Lump Ore Reduction Process

Thu, 31 Jul 2025 00:00:00 +0000

Carbon is an essential element in the iron reduction process. Cokes are used as a carbon source in the traditional reduction process in the beneficiary of iron. When the Ironmaking Technology Mark 3 (ITMk3) method is applied in the reduction process, many carbon sources are used, especially the sources with sustainable and eco-friendly such as coconut shells, palm kernel shells, rice husk, and sugar cane bagasse. Saccharum officinarum or sugarcane extraction produced bagasse as the by-product. Like coconut shells, this rich carbon by-product is not utilized. This work discussed the utilization of bagasse as a reducing agent in the iron reduction process. An analysis is made based on specific reduction temperature with the various ratio of iron to coal. The lump ore is originated from South Borneo. Unlike the coconut shell, in this work, the Baggasse was dried. The process temperature range between 700 and 1000^OC. The ratios of ore to bagasse were 1 to 1, 1 to 2, 1 to 3, and 1 to 4. The reduction process was carried out in a muffle furnace. The result shows that the reduction process produced wustite (FeO). This work also compared sugarcane bagasse with other green reducing agents.

Front Cover Vol 03 No 03 2025

Sun, 10 Aug 2025 00:00:00 +0000

Table of Content Vol 03 No 03 2025

Sun, 10 Aug 2025 00:00:00 +0000