3D FIRE AND GAS DETECTOR MAPPING

We performed 3D Fire and Gas Detector Mapping Studies following guidance from ISA -TR84.00.07-2018.

For the Gas Case, Gas Scenario Coverage is determined with our advanced 3D CAD Fire and Gas Detector Application, the frequency of hazard scenarios is calculated, and consequences of dispersions are simulated in DNV-GL Phast Software at the % LFL set point of interest. Detail Dispersion Reports along with cloud % LFL side view and footprint from Phast software are exported and 3D Dispersion is generated in our 3D CAD Fire and Gas Detector Application and plotted in the process plant cad drawings.

The 3D Frequency dispersion Iso-Contours at the % LFL of interest are plotted, and the Global Gas Zone of Interest is segregated in Sub-Zones. In each gas sub-zone, a matrix of point / open-path detector is position at a determined x, y, z distance. Gas Scenario Coverage of each detector is evaluated by determining the 3D dispersion clouds that reach the detector considering wind direction probability according the site’s wind rose. For each zone, point and open-path detectors with highest Gas Scenario Coverage are selected, and with these detectors the global gas zone Gas Scenario Coverage is calculated.

For the Fire Case, Fire Geographic Coverage is determined with our advanced 3D CAD Fire and Gas Detector Application, 3D Process Plant Cad Drawings are generated from 2D drawings or imported into our application if available. Hazards Scenarios Pool and Jet Fire radiation flux and Flame consequences are simulated in DNV-GL Phast Software. The 2D footprint and Side View Pool / Jet Fire consequences are exported from Phast software and 3D Pool/Jet Fire radiation flux and flame shape are generated in our 3D CAD Fire and Gas Detector Application.

The 3D Frequency Pool/Jet Fire radiation flux Iso-Contours are plotted. The 3D grade zone is determined and plotted, and fire detector's 3D Field of View at the required radiant heat output (RHO) is position. Our advanced 3D CAD Fire and Gas Detector Application projects the 3D obstructed view of each fire detector taking into consideration the obstructions in the path of the detector’s field of view.

For each detector and voting configuration of detectors, 3D fire detector's coverage within the 3D fire grade zone is determined. Results are presented in Cad format with 3D undetected (obstructed view) coverage along with 3D detected coverage.