Application of Combustion Analyzers in Safety Instrumented Systems

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The purpose of this paper is to review the standards of IEC 61511 and API RP 556 as they apply to flue gas analyzers and the implementation of SIS system for combustion monitoring.

The combustion process has always been considered having the potential for a hazardous event which could lead to personnal injury or loss of production.  To mitigate this risk, the process industry is now implementing safety instrumented systems which can identify hazardous operating conditions and correctly respond to bring the combustion process back to a safe operating condition or implement an automatically controlled shutdown sequence to reduce the risk of operator error causing a catastrophic event.  Oxygen and combustible flue gas analyzers are now being utilized in these combustion safety instrumented systems (SIS) to identify hazardous operating conditions and automatically return the process to a safe state.