| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 586435 | Journal of Loss Prevention in the Process Industries | 2011 | 8 Pages |
A previous article dealt with turbulent jet flow modelling with the aim at developing a method for estimating the size of explosive clouds following a high Reynolds number release, within hazardous area classification scheme. The results have demonstrated that the standard EN 60079-10 (2009) largely overestimates the real size of clouds resulting from a piping or a vessel leak. On the other hand, laminar jets are possible also at moderately high Reynolds numbers; furthermore, a reduced momentum, typical of laminar jets, is often assumed in QRA studies, as a conservative assumption, due to the expected lower air entrainment and to the corresponding larger size of the flammable cloud volume. These considerations have suggested the suitability to extend the previous analysis also to laminar regime, taking into account the effect of density and viscosity differences between air and flammable gas.
Research highlights► Hazardous area classification modelling has been developed with reference to gas density and transport properties. ► Comparison to turbulent regime is carried out. ► Reference to international standards (formally EN 60079-10-1, 2009 and API RP 521, 2007) is made. ► Applicative examples have been given, relevant to hydrogen and hydrocarbons.
