A DENSE VAPOR DISPERSION CODE PACKAGE FOR APPLICATIONS IN THE CHEMICAL AND PROCESS INDUSTRY

A computer code package for dispersion of dense vapour clouds in obstr ucted terrains is presented. The package consists of three models: a d etailed fully three-dimensional model and two models (a 1-D and a 2-D) based on the shallow layer concept. The models are validated by the a pplication of three field tests with different degrees of geometrical complexity. The first test was performed on flat terrain under isother mal conditions. The second was a cold jet release with a straight fenc e perpendicular to the flow. In the last test a semicircular fence obs tructed the flow. The validation exercise indicated that the dimension of the model applied should preferably be of the same order as the ge ometry to be described.