Shell FRED, a consequence modelling tool

Shell FRED is a fire, release, explosion and dispersion consequence modelling tool developed by Shell and available exclusively through Gexcon. Shell FRED is a well-validated consequence modelling tool, with a range of models that are well suited to hydrogen scenarios. The jet fire model has been validated against a wide range of experimental data, and published papers describe the applicability of the dispersion model and vessel burst (pressure vessel failure) models to hydrogen scenarios. Additionally, the CAM (Congestion Assessment Method) explosion model, available in both FRED and Shepherd, has been validated for use with hydrogen. This model also includes a prediction of whether an explosion is likely to transition to detonation (the phenomenon known as DDT, Deflagration to Detonation Transition). Finally, all of FRED’s scenarios are underpinned by a full thermodynamic package, which allows explicit consideration of complex mixtures (i.e., hydrogen in a carrier) and phenomena such as the Joule-Thomson effect and the heating effect this can have with high pressure hydrogen. Shell FRED uses and applications - Preparation and update of safety cases - Justification for new design and operation - Facility layout and equipment optimization - Pre-incident and emergency response planning studies - Domino effects/escalation management studies - Accident investigation - Quantitative risk analysis (QRA) – with results directly integrated into Shell’s QRA tool Shell Shepherd