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Quantitative risk assessment for accidental release of ethylene oxide from purification column of an ethylene oxide production unit
, Article CHISA 2006 - 17th International Congress of Chemical and Process Engineering, Prague, 27 August 2006 through 31 August 2006 ; 2006 ; 8086059456 (ISBN); 9788086059457 (ISBN) ; Hashemi, V ; Rashtchian, D ; Sharif University of Technology
2006
Abstract
This paper outlines a quantitative risk assessment for an 110,000 ton/day ethylene oxide production plant in Iran. After a complete and detailed hazard identification study, done by HAZOP method, the purification column was found to be one of the most hazardous sections in this plant. As ethylene oxide with high concentration and inventory is present there. Fault tree analysis (FTA) technique has been used to identify the basic events responsible for top event occurrence and also calculation of top event frequency of occurrence. Human error has been calculated numerically and probability of human error has been estimated. Failure rate data were collected referring to several sources and...
Conflict resolution maneuvers based on genetic algorithm modified webs
, Article 2009 IEEE Aerospace Conference, Big Sky, MT, 7 March 2009 through 14 March 2009 ; 2009 ; 1095323X (ISSN); 9781424426225 (ISBN) ; Alaeddini, A ; Sharif University of Technology
2009
Abstract
In this paper, the problem of designing optimal conflict-free maneuvers for planar multiple aircraft encounters is studied. The maneuvers propose suitable heading changes for aircraft in a cooperative manner. The new mathematical approach provides optimal trajectories to resolve a wide variety of conflicts, especially in the presence of high-altitude Clear Air Turbulence (CAT). The proposed approach effectively uses Genetic Algorithms (GA), together with modified webs, to quickly find conflict-resolving maneuvers. Different case studies show the method is fast enough to be used for real-time applications when resolving conflicts involving two aircraft. It is also efficient enough to resolve...
Simultaneous pool fires modeling using the combination of semiempirical and CFD tools
, Article 18th International Congress of Chemical and Process Engineering, CHISA 2008, Prague, 24 August 2008 through 28 August 2008 ; 2008 ; Rashtchian, D ; Sharif University of Technology
2008
Abstract
Pool fire modeling and risk assessment is very important and essential especially in systems with large flammable fuel inventories, e.g., refineries, offshore oil platforms, or fuel transportation systems. Results obtained from pool fire risk assessment can be used in setting up safety measure or emergency planning. Pool fire modeling is used to evaluate the heat flux at various target points around the fire source. The two major approaches in pool fire modeling are semi-empirical models and Computational Fluid Dynamics (CFD), which are called field models. Semi-empirical models are based on correlations fitted to data from large-scale Experiments and are used more frequently than CFD models...