Abadan Institute of Technology
Abadan Institute of Technology
Yazdi M.,Eastern Mediterranean University |
Daneshvar S.,Eastern Mediterranean University |
Setareh H.,Abadan Institute of Technology
Safety Science | Year: 2017
This is an obvious fact that a significant number of accidents happening each year are due to the failure of aircraft systems’ components. To manage this risk, Failure Mode and Effects Analysis (FMEA), a well-known method, is employed for reliability analysis in the mentioned fields. Three elements; Severity (S), Detection (D) and Occurrence (O) are considered in typical FMEA to calculate the Risk Priority Number (RPN) for concentrating on the risks and taking corrective actions. The significant numbers of shortcoming which have mentioned in literature can be faced to crisp RPN computation. Therefore, the purpose of this study was to extend FMEA by considering a group decision-making under the fuzzy environment. In fact, the present study was designed to contribute both theoretically and practically contributes to aircraft landing system as one of the important potential failure mode in aerospace industry. In an engineer standpoint the comparison of results between the conventional FMEA and Fuzzy Developed FMEA (FDFMEA) suggests that the risky failure modes accompanied with FDFMEA yield a more reliable result. © 2017 Elsevier Ltd
Wu S.,National Taiwan University |
Firoozabadi A.,Abadan Institute of Technology
Journal of Canadian Petroleum Technology | Year: 2011
The alteration of the wettability from liquid-wetting to intermediate gas-wetting results in improved liquid mobility, which has been demonstrated by a number of authors in recent years. In this work, we show that the gas-phase mobility may either increase or decrease in the state of intermediate gas-wetting. The increase or decrease in the gas-phasemobility is a function of the minimum liquid saturation. We also confirm that, as a result of the wettability alteration, there may be a substantial decrease in the two-phase high-velocity coefficient compared to the unaltered wettability state. The increase in the gas- and liquid-phase relative permeabilities and a decrease inthe high-velocity coefficient of the two-phase flow from the wettability alteration contribute to improved gas wellproductivity. © 2011 Society of PetroleumEngineers.
Sorkh-Kaman-Zadeh A.,Islamic Azad University at Kermān |
Dashtbozorg A.,Abadan Institute of Technology
Journal of Molecular Liquids | Year: 2016
In the present study, Sr2TiO4 nanostructures were synthesized by a sono-chemical method. The influence of the alkaline agent on the shape and particle size has been investigated. These alkaline agents were different from each other in the number of amine groups. These amines affected the morphology of the product and optimizing was done according to scanning electron microscopy (SEM) images. Products were also characterized by X-ray diffraction (XRD), N2 adsorption (BET), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), X-ray energy dispersive spectroscopy (EDS) and Ultraviolet–visible absorption (UV–vis) spectroscopy. The photocatalytic activity was studied for degradation of azo dyes as models of chemical contaminants. The effect of morphology and type of azo dyes on degradation efficiency was investigated. Results show that the best catalytic activity was observed for nanoparticles that synthesized in the presence of ethylene diamine. © 2016
Rezaee S.,Abadan Institute of Technology |
Rashed G.R.,Abadan Institute of Technology |
Golozar M.A.,Isfahan University of Technology
International Journal of Corrosion | Year: 2013
Sol-gel 8 wt.% Yttria Stabilized Zirconia (YSZ) thin films were prepared on zirconium (zircaloy-4 alloy) by dip-coating technique followed by heat treating at various temperatures (200°C, 400°C, and 700°C) in order to improve both electrochemical corrosion and high temperature oxidation properties of the substrate. Differential thermal analysis and thermogravimetric analysis (DTA-TG) revealed the coating formation process. X-ray diffraction (XRD) was used to determine the crystalline phase structure transformation. The morphological characterization of the coatings was carried out using scanning electron microscopy (SEM). The electrochemical behavior of the coated and uncoated samples was investigated by means of open circuit potential, Tafel, and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution. The homogeneity and surface appearance of coatings produced was affected by the heat treatment temperature. According to the corrosion parameters, the YSZ coatings showed a considerable increase in the corrosion resistance, especially at higher heat treatment temperatures. The coating with the best quality, from the surface and corrosion point of view, was subjected to oxidation test in air at 800°C. The coated sample presented a 25% reduction in oxidation rate in comparison with bare substrate. © 2013 S. Rezaee et al.
Hadi E.,Abadan Institute of Technology
Composites: Mechanics, Computations, Applications | Year: 2014
The problem of stress intensity factor (SIF) investigation for radial cracks in a thin hollow rotating functionally graded material (FGM) disk is of utmost interest. The disk is assumed to be isotropic with exponentially varying elastic modulus in the radial direction. The crack length and material gradation are the main parameters to be studied. The critical values of stress intensity factors in homogeneous and FGM disks are obtained. The results show that the SIF is highly dependent on the crack length and material gradation. © 2014 by Begell House, Inc.
Eskandari H.,Abadan Institute of Technology
Jordan Journal of Mechanical and Industrial Engineering | Year: 2014
This article focuses on the stress analysis of an internal crack located at an arbitrary position in a rotating functionally graded material disk. The disk is assumed to be isotropic with exponentially varying elastic modulus in the radial direction. A comprehensive study is carried out for various combinations of the crack length, direction, and location with the different gradation of materials. The results show that the material gradation, the crack position and the crack length have a significant influence on the value of stress intensity factors. Numerical results are given to assess the safety of the FGM and homogeneous cracked disks. © 2014 Jordan Journal of Mechanical and Industrial Engineering. © 2014 Jordan Journal of Mechanical and Industrial Engineering.
Bashiri E.,Abadan Institute of Technology
World Academy of Science, Engineering and Technology | Year: 2010
A 7-step method (with 25 sub-steps) to assess risk of air pollutants is introduced. These steps are: pre-considerations, sampling, statistical analysis, exposure matrix and likelihood, dose-response matrix and likelihood, total risk evaluation, and discussion of findings. All mentioned words and expressions are well-understood; however, almost all steps have been modified, improved, and coupled in such a way that a comprehensive method has been prepared. Accordingly, the SADRA (Statistical Analysis-Driven Risk Assessment) emphasizes extensive and ongoing application of analytical statistics in traditional risk assessment models. A Sulfur Dioxide case study validates the claim and provides a good illustration for this method.
Sa'idi E.,Abadan Institute of Technology |
Anvaripour B.,Abadan Institute of Technology |
Jaderi F.,Abadan Institute of Technology |
Jaderi F.,University Putra Malaysia |
Nabhani N.,Abadan Institute of Technology
Journal of Loss Prevention in the Process Industries | Year: 2014
Operating several assets has resulted in more complexity and so occurrence of some major accidents in the refining industries. The process operations risk factors including failure frequency and the consequence components like employees' safety and environment impacts, operation downtime, direct and indirect cost of operations and maintenance, and mean time to repair should be considered in the analysis of these major accidents in any refinery. Considering all of these factors, the risk based maintenance (RBM) as a proper risk assessment methodology minimizes the risk resulting from asset failures. But, one of the main engineering problems in risk modeling of the complex industries like refineries is uncertainty due to the lack of information. This paper proposes a model for the risk of the process operations in the oil and gas refineries. The fuzzy logic system (FLS) was proposed for risk modeling. The merit of using fuzzy model is to overcome the uncertainty of the RBM components. This approach also can be accounted as a benchmark for future failures. A unified risk number would be obtained to show how the criticality of units is. The case study of a gas plant in an oil refinery is performed to illustrate the application of the proposed model and a comparison between the results of both traditional RBM and fuzzy method is made. For the case study, 26 asset failures were identified. The fuzzy risk results show that 3 failures have semi-critical level and other 23 failures are non-critical. In both traditional and fuzzy RBM methods, some condenser failures had the highest risk number and some pumps were prioritized to have the lowest risk level. The unit with unified risk number less than 40 is in the non-critical conditions. Proposed methodology is also applicable to other industries dealing with process operations risks. © 2014 Elsevier Ltd.
Ataallahi E.,Abadan Institute of Technology |
Shadizadeh S.R.,Petroleum University of Technology of Iran
Safety Science | Year: 2015
The main objectives of any drilling companies are drilling safely, providing usable well completion and minimizing costs. Among all, health, safety and environment (HSE) consideration supersedes. Also, oil and gas well-drilling industry is an industry with high level of risks concerning HSE. Not only does each factor of these risks need to be analyzed but also need to be adjusted by the appropriate risk modeling. This project is assigned to model risk and consequence assessment for some aspects of blowout. The consequences should be formulated but require some adjustment. Proper Delphi group for risk assessment is made to localized risk factors. As there is uncertainty during data collection, the fuzzy approach is used. Finally, prioritizing the assets according to their criticality demonstrate significance of the risk.In the case study, the blowout in onshore Iranian drilling industry is studied. The results show that the risk of blowouts according to the reason of shallow gas in exploration well is the highest. Human failure, attack, natural event, lost circulation in development well and human failure in workover well, are another risks for Iranian drilling industry, respectively. © 2015 Elsevier Ltd.
Eskandari H.,Abadan Institute of Technology
Jordan Journal of Mechanical and Industrial Engineering | Year: 2016
The present study focuses on three-dimensional analyses of a thick walled functionally graded material cylinder, containing a longitudinal semielliptical internal surface flaw, and is subjected to an internal pressure and a rotational speed. The cylinder is assumed to be isotropic with exponentially varying elastic modulus through the thickness. The effect of wall thickness on the distribution of stress intensity factor is also studied. The results which are normalized for the advantage of non-dimensional analysis show that the material gradation, the crack geometry and wall thickness have a significant influence on the amount and distribution of stress intensity factors. Numerical results are given to assess the safety of the FGM and homogeneous cracked cylinder. The study is valuable to engineering applications. © 2016 Jordan Journal of Mechanical and Industrial Engineering. All rights reserved.