I would like your opinions about Fire and Gas Systems and Safety Instrumented Systems
In align with your question and title, safety instrumented fire & gas system is a system which is accountable to have both system as fire and gas. In this system, explosive (ATEX) proof devices could be used with other parameters as required to have safety environment.
Flammable gas, toxic gas, H2 gas etc. are quite hazardous in environment to have gas system. To have a system in the same, we need to have a system called as fire and gas system. Which could be used for fire and gas; for industrial arena and other.
Please mention and elaborate your question on safety instrumented system to have a look.
It would be helpful if you had a more specific questions.
Safety Instrumented System (SIS)
SIS is an instrumentation and control system that detects out-of-control conditions and automatically returns the process to a safe state. The SIS is not part of the Basic Process Control System (BPCS) which is used for normal, regulatory process control.
Basic Process Control System (BPCS)
Pressure is normally controlled by a regulatory control loop, the BCPS, which modulates a pressure control valve. An independent high pressure shutdown function is implemented in a SIS. The SIS is independent from the BCPS in so far as the components used in the BCPS and the SIS are separate, physically and functionally. This includes the sensor components, the logic solver, as well as the final control elements.
SIS are generally independent, both physically and functionally, from the BCPS in order to ensure that any condition which might result in an out-of-control process parameter in the BCPS, is safeguarded by the SIS, regardless of the function of the BPCS.
Fire and Gas detectors may be part of an SIS control loop. F&G detectors are the detection element. The logic solver may then initiate executive action e.g. actuate the HVAC system
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