Fire and Gas (FGS) System
A fire and gas system is composed of sensors, logic solver, and final elements designed to detect combustible gas, toxic gas, or fire and either
a) Alarm the condition
b) Takes the process to safe state
c) Take action to mitigate the consequences of hazardous event
Sensors may consist of heat, smoke, flame, and gas detectors, along with manual call boxes. Logic systems may consist of conventional PLCs, distributed control system (DCS), safety PLCs, special purpose PLCs designed specifically for FGS applications or dedicated multi-loop FGS controllers. Final elements may consist of flashing/strobe lights, sirens, a telephone notification system, exploding squibs, deluge systems, suppression systems, and/or process shutdowns.
Safety Instrumented Systems, Design, Analysis and Justification 2nd Edition Paul Gruhn, and Harry L.Cheddie
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