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Could be the simple methods of overpressure calculation during vented gas explosion universally used for various conditions?
Proper design of gas explosion mitigation measures e.g. bursting discs cannot be done without knowledge of object internal blast loading. This question is also important in connection with European directive 1999/92/EC known as ATEX 137. Empirical, semi-empirical and theoretical methods could be used for generated maximum overpressure calculation or venting area calculation. Computational fluid dynamic used in sophisticated software codes is other possibility. There is comparison of some empirical and semi-empirical relations in the paper. Results of calculations are compared with experimental results published by various authors under utilisation of various geometrical configurations and various mixtures. There are recommendations for usage of relations listed in this report. Most of all mentioned relations give mostly quite good agreement with experimental results. Cubbage's relation despite of it's simply form give good results which could be both over and underestimated. Dragosavic's relation gives values slightly lower than 1 almost for all cases only for hydrogen-air mixtures and for experiments in spherical vessels gives values overestimated but still lower then factor 10. It gives the best agreement for natural gas. Rasbash's relation overestimate results for all condition except acetone and the agreement is very good. Even for acetone it gives results in very narrow range. NFPA overestimate almost all results in addition there are constants only for few gases to be used. Palmer's relation gives average value slightly lower then 1 but standard deviation range for spherical vessels include minus values. The relation overestimates results only for hydrogen. Yao's equation overestimates results for all cases except methane-air mixtures. The results for hydrogen and spherical vessel are in very wide range including minus values. Molkov equation gives for all experiments results in narrow range. It over and underestimate results for different condition. It could be said that despite of it's simply form Cubbage's equation is very universal, Molkov equation is also very universal but despite the fact that it seems to be more sophisticated then Cubbage's one sometimes it gives worse results. Last mentioned equation will be the Rasbash's equation. That one is universal over wider range than Molkov's or Cubbage's ones but tend to slightly overestimate results to safe side.
Could be the simple methods of overpressure calculation during vented gas explosion universally used for various conditions?
Proper design of gas explosion mitigation measures e.g. bursting discs cannot be done without knowledge of object internal blast loading. This question is also important in connection with European directive 1999/92/EC known as ATEX 137. Empirical, semi-empirical and theoretical methods could be used for generated maximum overpressure calculation or venting area calculation. Computational fluid dynamic used in sophisticated software codes is other possibility. There is comparison of some empirical and semi-empirical relations in the paper. Results of calculations are compared with experimental results published by various authors under utilisation of various geometrical configurations and various mixtures. There are recommendations for usage of relations listed in this report. Most of all mentioned relations give mostly quite good agreement with experimental results. Cubbage's relation despite of it's simply form give good results which could be both over and underestimated. Dragosavic's relation gives values slightly lower than 1 almost for all cases only for hydrogen-air mixtures and for experiments in spherical vessels gives values overestimated but still lower then factor 10. It gives the best agreement for natural gas. Rasbash's relation overestimate results for all condition except acetone and the agreement is very good. Even for acetone it gives results in very narrow range. NFPA overestimate almost all results in addition there are constants only for few gases to be used. Palmer's relation gives average value slightly lower then 1 but standard deviation range for spherical vessels include minus values. The relation overestimates results only for hydrogen. Yao's equation overestimates results for all cases except methane-air mixtures. The results for hydrogen and spherical vessel are in very wide range including minus values. Molkov equation gives for all experiments results in narrow range. It over and underestimate results for different condition. It could be said that despite of it's simply form Cubbage's equation is very universal, Molkov equation is also very universal but despite the fact that it seems to be more sophisticated then Cubbage's one sometimes it gives worse results. Last mentioned equation will be the Rasbash's equation. That one is universal over wider range than Molkov's or Cubbage's ones but tend to slightly overestimate results to safe side.
Could be the simple methods of overpressure calculation during vented gas explosion universally used for various conditions?
Können einfache Methoden zur Berechnung des Überdrucks bei entlasteten Gasexplosionen universell bei verschiedenen Bedingungen verwendet werden?
Sustek, Jiri (author) / Janovsky, Bretislav (author) / Vejs, Lukas (author)
2008
14 Seiten, 11 Bilder, 25 Quellen
Conference paper
English
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