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Jean-Louis GUSTIN: Rhodia Research & Technologies
INTRODUCTION
DIERS (Design institute for emergency relief systems) methods are used to protect reactors and enclosed vessels from runaway reactions. DIERS methods have already been the subject of two articles in Techniques de l'Ingénieur.
The article
DIERS methods distinguish three categories of reaction systems according to the type of pressurization they produce:
• High vapor systems are the subject of the same article
• Gassy reactions are the second category of reaction systems for which we have specific methods of sizing emergency vents. These reaction systems are the subject of the article
• Finally, hybrid systems are reaction systems that pressurize enclosures by steam pressure and incondensable gas production simultaneously. They are the subject of this article
The demand for sizing this type of reaction system is relatively low, due to the complexity of the situation, the complexity of vent calculation methods and the difficulty of obtaining the experimental data required for the calculation. Hybrid reaction systems do exist, however, for...
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Calculating vents. DIERS methods
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