Vent sizing hybrid systems

In some hybrid systems, the generated vapor in a vented reaetion is high enough to remove suffieient latent heat to moderate or temper the runaway (i.e., to maintain eonstant temperature). This subsequently gives a smaller vent size. 

Leung, J. C., Vent Sizing for Gassy and Hybrid Systems, in Safety of Chemical Batch Reactors and Storage Tanks, Benuzzi, A. and Zaldivar,J. M. (ed), 299-310, Kluwer Academic Publishers, Dordrecht, April 1991. 

The use of the sizing method above for gassy systems assumes that case (iii) is not a tempered hybrid. If, during detailed relief sizing, case (iii) does turn out to be a tempered hybrid system, and the vent size is significantly smaller, then the worst case would need to be reassessed, by carrying out detailed relief sizing for both cases (ii) and (iii). 

J C Leung, J A Noronha, A J Torres, J J Sharkey M H Yue, "A Vent Sizing Program with Particular Reference to Hybrid Runaway Reaction Systems", International Symposium on Runaway Reactions and Pressure Relief Design, 567 - 579, AlChE, 1995, ISBN 0-8169-0676-9... 

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