Vent sizing gassy systems

ALTERNATIVE RELIEF SYSTEM SIZING METHODS FOR TOP VENTING OF GASSY SYSTEMS... 

The major method of vent sizing for gassy system is two-phase venting to keep the pressure eonstant. This method was employed before DIERS with an appropriate safety faetor [34], The vent area is expressed by ... 

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). 

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