3D Fire and gas mapping is used to determine the optimum layout of fire and gas detectors within a facility. It ensures that the detector configuration gives minimum redundancy and maximizes the area coverage, thereby reducing the effort required for ongoing maintenance. The technique can be applied to new sites or to existing installations. It improves safety and optimizes systems by maintaining high safety levels while minimizing the number of devices and therefore cost.
To facilitate fire and gas mapping, software is used to allow for quick analysis of detector locations in relation to obstructions within a specific target zone.
Objectives
The objective of the F&G Detection Mapping study is to achieve fire and gas detection system that meets the performance target required to detect any accidental gas release or accidental ignition at its early stage and take control action as well as alerting the on-board personnel for the following scenario.
⦁ Presence of flammable gases
⦁ Presence of a fire
The study will include the following as required:
⦁ Performance target for fire and gas detection system based on the risk level at each hazard area.
⦁ Determine the level of congestion at each hazard area and assess the risk of hydrocarbon gas accumulation and the minimum gas cloud volume which if ignited will cause significant damage.
⦁ Recommend the optimum type, location, and numbers of detectors to meet the performance target coverage.
⦁ Smoke Detector Modelling is not considered under current scope.
gas detectors can be optimized by performing geometric calculations on the 3D model. The analysis is fully three-dimensional and gives confidence that defined performance targets are being met. The resulting detector locations typically give significantly improved detection coverage over more traditional rule-of-thumb approaches to installing detectors. Full three-dimensional CFD simulations are also used to provide more accurate and firm study bases to avoid over-conservatism in the number of detectors used.
