Simetrikal: Journal of Engineering and Technology

Analysis of Overall Equipment Effectiveness (OEE) as an Effort to Increase The Productivity Filling Line of Lithos Packaging Lubricant

Tania Nasution, M. Ramadhan, Chindy Revadi, Ahmad Shalihin, Fadylla Nasution — Wed, 31 Jul 2024 00:00:00 +0700

This research was conducted at a company engaged in the lubricants business. This study examines the filling station lithos packaging. The lithos packaging filling station consists of 6 filling lines (FL), namely FL-1, FL-2, FL-3, FL-4, FL-5, and FL-6. From each filling, the line will be observed and analyzed in the format of the automation machine program. Based on the observations and analysis, it was found that FL-4 has an availability rate, performance rate, and quality rate below standard, so it is necessary to identify the cause of the low Overall Equipment Effectiveness (OEE) value of FL-4. This study analyzes the factors causing the low Overall Equipment Effectiveness (OEE) score on FL-4 using Six Big Losses and Fishbone diagrams. From the research results, it was found that several factors caused the less productive FL-4, namely breakdown losses with a value of 48%, setup and adjustment losses with a value of 3%, idling and minor stoppages with a value of 7%, reduced speed losses with a value of 41%, and defect losses with a value of 1%. An analysis was carried out using a fishbone diagram to determine the root cause of the high value of breakdown losses, reduced speed losses followed by idle and minor stoppage losses, and setup and adjustment losses. Based on the fishbone diagram, it was found that the factors causing the FL-4's unproductivity in terms of machine factors, method factors, human factors, material factors, and environmental factors. The causes of unproductive FL-4 are damage to the machine, downtime, the operator's less responsiveness to machine problems, operator expertise, decreased work ethic, defective materials, late material stocks, and hot room temperatures. Based on this, the proposed improvements given are to schedule machine maintenance at a specified time (preventive maintenance), not by the factor of damage (breakdown maintenance), make data guide for product change for each machine and attach it to each machine in full so that This downtime can be reduced, placing technical operators who focus on each filling line at least one technical operator, to speed up downtime and not disrupt the production process, add fans to speed up air circulation to reduce heat in the area and change material suppliers to get better quality.

Analysis Of Energy Absorption In Crash Box With Variation Of Trigger Hole Cyrcle Model Using Experimental Tests

Ahmad Yunus Nasution, Togu Siregar, Tania Nasution — Wed, 31 Jul 2024 00:00:00 +0700

Traffic accidents kill people every day and a large number of people are injured or killed in car accidents, safety in the automotive industry is being researched extensively. Every year, more than 1.2 million people are killed and ten million are injured in traffic accidents worldwide. Crash boxes as passive safety in vehicles continue to be modified to increase their ability to absorb energy. In this research, 3 crash box models were designed with a frusta model using Aluminum AA 6061-T4. Modeling was carried out using Solidwork software and testing using a Universal Testing Machine. From Experimental test results show that the Frusta 1 hole model crash box has the largest energy absorption capacity compared to other models, 1132.8 J with a force of 118 kN at a displacement of 28.32 mm. This shows that providing the Frusta model with a hole as a trigger provides an increase in the crash box's ability to absorb energy.

Noise Exposure Analysis and Hearing Conservation in the CPO Industry of North Sumatra: A Case Study on Noise Mapping Techniques

Chindy E Revadi, M. Sazli Rasyidi, Cinthya Margaretta, Khairullah Zikri — Wed, 31 Jul 2024 00:00:00 +0700

This research examines the risks of noise exposure in a palm oil production facility in North Sumatra, Indonesia. The facility processes fresh fruit bunches (FFB) into crude palm oil (CPO) and palm kernel. The production machinery operates continuously for long periods, such as 20 hours per day, to meet output targets. This requires a two-shift operation, potentially exposing workers to machine noise for about 10 hours per shift. The main sources of noise are the machinery and equipment. A noise mapping methodology has been used to visualize the distribution of noise levels, revealing that levels exceed the safe threshold (e.g., 85 dB). To address this, the study recommends enforcing the use of personal protective equipment and regulating working hours to minimize noise exposure. These measures are crucial for ensuring the safety and well-being of workers in industrial settings with high noise levels.

Analysis of the Storage of Solid Medical Hazardous and Toxic Waste (B3) in Enhancing the Performance of Type C Hospitals: A Case Study at Universitas Sumatera Utara Hospital

Sarah Patumona Manalu, Amir Husin, Isra' Suryati, Novrida Hasibuan, Janet Jitmau — Wed, 31 Jul 2024 00:00:00 +0700

The Universitas Sumatera Utara Hospital’s waste management system, based on Regulation 56 of 2015, has been criticized for unsanitary conditions and lack of proper waste labeling. A study focusing on three locations revealed that the majority of B3 waste originates from infectious properties and sharp objects. The hospital's waste management involves segregating waste based on its characteristics, using appropriate containers, and transporting it to the B3 waste Temporary Storage for storage. The hospital is implementing a multi-stage approach to manage B3 waste, including sorting, containerization, internal transportation, and storage. The waste is segregated and contained within designated containers, transported daily using trolleys or wheeled containers, stored in facilities shielded from direct sunlight, and designed to prevent access by animals, insects, and birds. Regular cleaning is also essential. The hospital aims to improve waste management efficiency by implementing proper waste disposal, packaging, and transportation.

The Effect Of Clam Shell Powder And Fly Ash as Clay Stabilizier on California Bearing Ratio (CBR) And Unconfined Compression Test (UCT)

Derry Wiliyanda Nasution, Ika Hastuty, Fahmi Iskandar — Wed, 31 Jul 2024 00:00:00 +0700

Stabilization is an attempt to improve soil conditions that have poor properties index. One of the stabilization of soils is usually done by adding chemicals to the soil. Common chemicals used are cement, lime, bitumen. In this study clay soil stabilization was carried out by the addition of clam shell powder and fly ash.

The purpose of this study was to determine the value of the index properties, the Atterberg value, the standard Compaction value, the value of the California Bearing Ratio (CBR) and compressive strength test values of Unconfined Compression Test (UCT) on clay.

From the study, it was obtained that the original soil sample had a moisture content of 34.43%, a specific weight of 2.65, a liquid limit of 47.33% and a plasticity index of 29.88%. The original soil classification according to USCS is classified as Clay - Low Plasticity (CL) and according to AASHTO it is classified as A-7-6 (9). The unconfined Compression Test (UCT) of the original soil added was 1.42 kg / cm2. Soaked laboratory CBR values for native soils are 6.29%.

The most effective results were obtained from a mixture of 8% of shell powder and 5% fly ash with a UCT value of 2.50% kg / cm2. For the CBR testing of laboratory mixtures the most effective variation on the mixture of 8% of shell powder and 5% fly ash with a laboratory CBR value soaked by 9.57%. The soil that has been mixed with the most effective stabilizer material, 8% of clam shell powder and 5% fly ash, belongs to the type of Clay - Low Plasticity (CL) based on USCS classification and classified as A-6 (6) based on AASHTO classification.

The Evaluation of the Use PET and HDPE Plastic Waste as Coarse Aggregate of Lightweight Concrete

Muthiah Putrilan Syamnah Harahap, Nursyamsi Nursyamsi, Kavin Luvian — Wed, 31 Jul 2024 00:00:00 +0700

The use of goods with plastic-based materials is familiar to society in general. Good for wrapping food, drinks, groceries, and others. Because of so much use, the problem of plastic waste cannot be avoided. Therefore, the purpose of this study is to overcome environmental land problems due to plastic waste. This research focuses on how to apply PET (Poly-Ethylene Terephthalate) and HDPE (High Density Polyethylene) plastic waste to concrete mixtures. PET plastic waste that has been chopped is then heated until melted then poured into molds and allowed to cool and harden. Then crushed and substituted as much as 5%, 10%, 15% and 20% replace the coarse aggregate to improve the characteristics of concrete. The results showed that the use of PET and HDPE in concrete resulted in decreased fill weight, lighter concrete weight, reduced compressive strength, and gave an optimum value of tensile strength at a variation of 10%. The use of PET plastic has a greater absorption value than HDPE, while the tensile strength value of PET is smaller than HDPE. Overall, it is concluded that PET and HDPE plastics have a big role in reducing the problem of plastic waste in the community