Asian Transactions on Engineering
Volume: 03, Issue: 05, November 2013
Title: Risk Management Using HAZOP Study Method Base Fault Tree Analysis on Emergency Shutdown System-Vacuum Distillation Unit, PT.PQR, Dumai,Indonesia
Author(s): Ali Musyafa, L.M Dewina, Ronny.D. Noriyati and Imam Abadi
Paper ID: ATE-70302050
Pages: 1 - 7
Abstract: Feed of reboiler heater system from PT. PQR is the object of study used to design risk management . The risk of failure on ESD components in reboiler Feed Heater is a plant shutdown. This study uses risk management to identify and calculate the risk of failure on plant reboiler feed heater, so that risks can be avoided resulting in increased losses of the company. Some of the causes and consequences of failure risk analyzed using HAZOP Study, while the development of the failure mechanism is analyzed using the FTA. Incorporate risk management to measure the likelihood and consequences of a risk score. Likelihood value is the frequency of failure each year in the form of MTTF values. Value of the consequences is the cost of failure in any component which is derived from multiplying the cost of repairs (CR) with a magnitude of Mean Time to Repair (MTTR), in addition to the value of the consequence is wasted time when there is a failure; it is derived from the MTTR. From the research that has been done can be seen that, the component with the highest risk score is FT1017C on Feed Pass # 2 flow. The consequent loss related to environment and personnel losses due to accident not been discussed in this study.
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Title: Effectiveness of a Facilities Layout using Multi-Criteria Decision Making Model
Author(s): Mohamed Z. Ramadan and AbdulAziz M. El-Tamimi
Paper ID: ATE-50308059
Pages: 8 - 13
Abstract: Performance measurement is an area to which facilities have paid much attention recently. There is a wide range of choices in measuring facility performance is essential to support various decision making problems that may arise during a facilities layout life cycle. The existing models have considered only material handling cost as the performance measurement factor. Nevertheless, general, flow of material, flexibility, space utilization, materials handling, storage arrangement, shipping and receiving, building and utilities, expandability without major disruption, and service activities have a significant contribution towards the layout effectiveness. Therefore, it is necessary to have an efficient model to determine the facilities layout's effectiveness by considering a set of layout effectiveness factors. The proposed model, using a fuzzy multiple attributes decision-making method, enables the decision-maker of a manufacturing enterprise to analyze alternative layouts in different boards, based on which they can develop decision towards productivity improvement. An illustrative example has been adopted for an empirical illustration. Results showed that the proposed model is a logical, simple and convenient implementation framework.
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Title: Speed Control for Direct Torque Control Permanent Magnet Synchronous Motor
Author(s): Abbas H. Abbas, Alaa A. Hassan and Dhiaa K. Shary
Paper ID: ATE-80303057
Pages: 14 - 18
Abstract: In this paper, the modeling of the Direct Torque Control (DTC) system of permanent magnet synchronous motor (PMSM) based on Matlab/Simulink environment is presented. Simulation results are introduced to predict the motor drive system performance and the effect of PI controller parameters on speed response in this system . The simulation also shows the torque ripple can be reduced by narrowing the torque hysteresis loops width.
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