Explosion effects are estimated within an advanced methodological approach, based on the use of FLACS® numerical code (international standard for the analysis of explosion scenarios in confined/congested geometries) by Gexcon AS. Depending on project goals and constraints, a Worst case or a Probabilistic approach may be adopted.
- Worst case approach: effects are estimated for the theoretical maximum gas cloud (Theoretical Worst case approach) or the maximum credible gas cloud (Realistic Worst Case approach);
- Probabilistic approach: a complete picture of the risk level is established through a comprehensive methodological framework, consisting in the following tasks:
- Ventilation simulations: providing ventilation rates inside the module under different weather conditions, correlated with weather statistics;
- Dispersion simulations: providing a representative selection of leak scenarios, and the corresponding effects in terms of flammable gas cloud space-and-time evolution, correlated with leak frequency data;
- Explosion simulations: providing a representative selection of explosion scenarios, and the corresponding effects in terms of pressure and flame front space-and-time evolution;
- Risk Calculation: producing probability of exceedance curves and iso-risk contour plots.