rsf consultores c.a.


3d vapor cloud explosion case



In this case we simulate the BP TEXAS CITY REFINERY EXPLOSION based on the CHEMICAL SAFETY BOARD (CSB) investigation report.


Our methodology involves Identifying Hazard Scenario, developing a 3D cad model of the Process Plant, simulating 2D dispersion in DNV GL PHAST Software and exporting results to further access 3D Cad Dispersion in our advanced 3D Cad Dispersion and Explosion Parameters Assessment Tool, then, defining Potential Explosion Sites (PES) and evaluating in each PES the required explosion parameter to simulate 3D Vapor Cloud Explosion. Finally, individual explosion results per PES site are presented in 2D and 3D cad format as well as cumulative Iso-Pressure Contour of the Process Plant and receptor of interest Overpressure/Impulse cumulative results.



HAZARD SCENARIO ASSESSMENT - 2D/3D CAD MODEL DEVELOPMENT



The 2D/3D Cad Model of the Isomerization Unit (ISOM) is developed and in this case the overflow from the F-20 Blowdown Stack is evaluated.



2d cad MODEL



3D CAD MODEL



DISPERSION MODELING



Dispersion at LFL end point is simulated in DNV GL PHAST Software and footprint/side view and detail dispersion results are exported. Then, the 3D Dispersion is further access in our 3D Cad Dispersion Application.



DISPERSION lfl- dnv gl phast



3d cad DISPERSION from dnv gl phast REPORT



CLOUD FOOTPRINT/SIDE VIEW- LFL



3D CAD DISPERSION FROM DNV GL PHAST REPORT



POTENTIAL EXPLOSION SITE (PES) ASSIGNMENT



Potential Explosion Sites (PES) are identified in regions of confinement and congestion that overlaps the 3D dispersion cloud.



2d POTENTIAL explosion site (pes) ASSIGNMENT



3d potential explosion site (pes) ASSIGNMENT



EXPLOSION PARAMETERS ASSESSMENT



Explosion parameters are calculated in our 3D Cad Explosion Parameter Assessment Tool, the 3D dispersion Cloud is intersected with each PES. The flammable cloud volume, and process equipment volume within the intersected PES are determined, then the volume blockage ratio (VBR), surface area of obstructions, typical diameter, and flame path length as well as the flammable mass within each PES are 3D Cad calculated. Finally, the max side on overpressure and the corresponding TNO Multi Energy (TNO-ME) scale strength of each PES is determined.


The TNO-ME and Baker–Strehlow-Tang (BST) explosion parameters are calculated for further explosion modeling in DNV GL PHAST Software.








3D EXPLOSION PARAMETER ASSESSMENT



TNO-ME 3D EXPLOSION RESULTS



Standalone Multi Energy (TNO-ME) vapor cloud explosion is set up in DNV GL PHAST Software. For each PES, overpressure results in 2D are presented from Phast Software and in 3D Cad format.



PES1 Overpressure Radi



PES1 3D Overpressure Radi



PES2 Overpressure Radi



PES2 3D Overpressure Radi



PES3 Overpressure Radi



PES3 3D Overpressure Radi



PES4 Overpressure Radi



PES4 3D Overpressure Radi



PES5 Overpressure Radi



PES5 3D Overpressure Radi



ISO - PRESSURE CONTOURS RESULTS



Cumulative Iso-Pressure Contours from all PES are combined. A grid of 0.1x0.1 meter is utilized.



Iso-Pressure Contours



RECEPTOR'S CUMULATIVE OVERPRESSURE/IMPULSE RESULTS



Given the coordinates of receptor of interest, cumulative overpressure/impulse is calculated.



Receptor Overpressure/Impulse



RSF CONSULTORES C. A.



Caracas, Venezuela

+58 0212-2571666





info@rsfconsultores.com