Kasem Bundit Engineering Journal

การวิเคราะห์ความเสี่ยงระดับปฏิบัติการ กรณีศึกษาสถานีบรรจุและขนส่งก๊าซหุงต้ม

2025-06-24T10:01:58+07:00

This research aims to assess risks at a liquefied petroleum gas (LPG) filling and transportation station in Rayong Province using Failure Mode and Effect Analysis (FMEA). A process flow chart was used to identify critical failure points across three main processes: LPG filling, transportation (including warehouse storage), and gas tank storage. Risks were evaluated using Severity, Occurrence, and Detection to calculate the Risk Priority Number (RPN). Results showed a significant risk reduction after implementing preventive and corrective measures. The risk of leakage during the gas filling process was reduced by 75% with strict valve seal inspection measures. The risk of gas filling valves not closing properly was reduced by 76% by replacing high-quality valves and inspecting equipment before each use. The risk of overfilling was reduced by 78% by checking and calibrating pressure sensors every 6 months. Cylinder drop risk during transportation was reduced by 67%, and valve leakage by 76%. Improper stacking risks decreased by 75% using standard racking. Gas leakage in storage was reduced by 76%, and fire hazard risk was lowered by 66.7% with automatic suppression systems and emergency training.

การประเมินต้นทุนทางเศรษฐศาสตร์วิศวกรรมของหม้อแปลงระบบจำหน่าย

2025-09-29T14:53:57+07:00

This research presents an engineering economic cost evaluation of a 1,000 kVA 3-phase 50 Hz 22 kV-400/230 V distribution transformer. A computer is used to assist in evaluating the cost of the distribution transformer to ensure it is suitable for the load usage, with accuracy, speed, and precision. The evaluation incorporates the transformer loss test results from the factory, interest rates, electricity tariffs, service life, and the environmental cost of energy losses in the transformer. These factors are used to assess and compare the transformer costs to determine the most appropriate option for a project, industrial operation, or business. This allows users to select the most cost-effective and efficient distribution transformer.

ผลกระทบของอุณหภูมิต่อปริมาณออกซิเจนละลายน้ำและคุณลักษณะของน้ำในระบบผลิตฟองอากาศด้วยกลไกการทำความเย็น

2025-07-19T10:16:30+07:00

This study aimed to evaluate the impact of temperature on dissolved oxygen and water characteristics in a bubble generation system with cooling mechanism. Experiments were conducted under three temperature conditions (21 ^oC, 23 ^oC, and 25 ^oC) and three storage periods over two weeks. The investigated parameters included dissolved oxygen (DO), total dissolved solids (TDS), electrical conductivity (EC), and pH. The findings indicated that DO exhibited a significant decreasing trend with increasing temperature, with the highest value recorded at 21 ^oC (11.6 mg/L) and the lowest at 25°C (10.5 mg/L). In contrast, TDS and EC showed significant increasing trends as temperature rose, reaching maximum values of 91.7 mg/L and 184.3 µS/cm, respectively, at 25 ^oC. The pH ranged between 7.4 and 7.9, reflecting a tendency toward higher pH values at elevated temperatures. Two-way ANOVA confirmed that temperature exerted significant effects on DO, TDS, EC, and pH, whereas storage duration partially influenced DO and pH. No significant interaction effect between temperature and storage duration was observed. Overall, the results highlight temperature as a critical determinant of water quality characteristics, reducing DO while increasing TDS, EC, and pH. These insights provide useful implications for optimizing water treatment system design and enhancing water quality management in agricultural applications.

การจำแนกสารอินทรีย์ระเหยจากหน้ากากอนามัยแบบใช้ครั้งเดียว

2025-06-17T15:49:25+07:00

Nowadays hygiene face masks, personal protective equipment, are widely used for protection against airborne transmission diseases and particulate matter. However, hygiene face masks made of polymer can emit volatile organic compounds (VOCs) which is harmful to wearers. This study aimed to measure VOCs quantitatively and qualitatively from four brands of single-use medical face masks and four brands of non-medical face masks. Each face mask was tested by cutting into a 1 x 5 cm² piece, placing it into a 20 mL glass sample vial, and sealing it tightly. The sample was then shaken at 30 ^oC for 24 hours. In-vial VOCs were sampled using solid-phase microextraction (SPME) with a DVB/CAR/PDMS fiber for 3 minutes, then analyzed by gas chromatography-mass spectrometry (GC-MS). Results show alkanes were major emitted compounds from all tested face masks due to their production of using polypropylene fibers. Additionally, ketone, aromatic, and alcohol compounds were detected, which are presumed to be additives in the manufacturing process. The total VOC emission rates were 0.03-0.14 µg/m²h^-1. The statistical analysis using the linear regression method indicated that the number of days and type of face mask had no statistically significant effect (p-value > 0.05) on the quantity of TVOC emitted from the face masks. A simple method of air-drying face masks for 3 days was found to reduce TVOC by two to five times. Furthermore, VOC emission standards for single-use face masks are thought to assist protecting consumers.

การจัดรูปแบบช่องเก็บค่าผ่านทางเพื่อรองรับระบบเก็บค่าผ่านทางอัตโนมัติแบบไม่มีไม้กั้น (M-Flow) บนทางพิเศษศรีรัช

2025-10-29T14:11:36+07:00

This research aims to determine the optimal toll lane configuration and number of toll lanes corresponding to the proportion of M-Flow users, integrated with existing systems (MTC and ETC), to maximize operational efficiency. The study employs the Aimsun microscopic traffic simulation model to simulate traffic conditions at three representative toll plazas, with test scenarios defined by three key variables: the proportion of M-Flow system users, the toll lane configuration layout, and the traffic volume. Average travel delay was utilized as the key performance indicator for traffic efficiency. The findings indicate that the determination of the optimal toll lane configuration is directly correlated with the M-Flow user proportion. If the user proportion is low, an excessive number of M-Flow lanes leads to underutilization and negatively impacts the capacity of the remaining conventional lanes. Conversely, if the M-Flow user proportion is high but the number of lanes is insufficient, it results in severe congestion and increased travel delay. The research concludes that incrementally adjusting the number of M-Flow lanes to correspond with the actual user proportion is a critical factor and proposes a criterion for this adjustment based on total traffic volume and the M-Flow user proportion for each plaza size. For instance, at Rama IX Toll Plaza, the number of M-Flow lanes should be increased from 1 to 2 when the M-Flow user proportion exceeds 60%. The Bang Sue 2 Toll Plaza should maintain 1 M-Flow lane, and the Asok 4 Toll Plaza should increase M-Flow lanes from 1 to 2 when the proportion exceeds 28%, and further increase to 3 M-Flow lanes when the user proportion exceeds 69%. These results provide a practical guideline for optimizing toll lane configuration to effectively maintain the level of service and minimize overall travel delay.

การพัฒนาจิ๊กเทมเพลตเพื่อลดระยะเวลาการติดตั้ง MIRROR และ LED

2025-07-22T15:29:08+07:00

This research aims to develop a jig template for the installation of mirrors and LED components, with a focus on reducing installation time. The improvement process incorporates ECRS technique (Eliminate, Combine, Rearrange, Simplify) to optimize workflow steps for greater efficiency and suitability. A comparative analysis of the installation process before and after the implementation revealed a reduction in the number of steps from 15 to 9, representing a 40% decrease. Furthermore, the total installation time was significantly reduced from 426.62 seconds to 200.03 seconds, yielding a time savings of 226.59 seconds or 53.11%. The results demonstrate that integrating jig template design with the ECRS approach effectively minimizes procedural complexity and operational time, thereby improving production efficiency and reducing time-related costs in manufacturing operations.