Aim of this paper is to gather some suggestions about the most consolidated tool in vapour disengagement dynamics modelling represented by the DIERS (Design Institute for Emergency Relief Systems of AIChE) procedure (Fauske et al., 1983a; Forrest, 1992) in order to favour a more approachable handling by an unskilled user. After a brief comment on the experimental range of reliability and on the classification of the flow regimes foreseen, the following aspect are analysed: centre dot the evaluation of the available correlations based on the drift flux theory; centre dot the choice of the vessel flow regime and of the particular vent model to solve the problem aiming at the computation time saving; centre dot the care in adopting a suitable time step of integration; All these aspects are connected with the obvious, but absolutely rigid constraint for the user: to be (in design phase) or to check to be (in simulation phase) within an acceptable bound of conservative options. To support this analysis, the simulation of a saturated water depressurization is reported.
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