A versatile approach to explosion vent design that considers the influence of flame acceleration from congestion


  • This article was presented at the American Institute of Chemical Engineers, 2009 Spring National Meeting, 5th Global Congress on Process Safety and, 43rd Annual Loss Prevention Symposium, Tampa, Florida, April 26–30, 2009.


Calculations for explosion venting in flammable vapor systems are often done using established methods documented in NFPA 68. It is understood that these equations may under predict vent area where enclosures are congested or the environment in the enclosure is initially turbulent. For new designs, it is helpful for design teams to have the flexibility to choose from a number of potential venting configurations. This article reviews a methodology that was developed and implemented for several projects where computational fluid dynamics was used to evaluate enclosure design parameters for a range of vent configurations. The results of the modeling simulations were then fitted to a lumped parameter model for deflagration venting developed by Molkov et al. The end result is an equation that can be used by the design team as needed to finalize the design minimizing the use of computer modeling resources. © 2010 American Institute of Chemical Engineers Process Saf Prog, 2010