IEC 61511

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IEC 61511 is a standards document titled "Functional safety - Safety instrumented systems for the process industry sector".

This standard refines the functional safety requirements laid down by IEC 61508 specifically for the process industry sector, for example refineries and chemical/pharmaceutical plants. It provides guidance in the proper application of Safety Instrumented System.

It extends the SIL concept to include environmental damage and asset loss, references studies in ALARP (As Low As Reasonably Practicable) and gives an overview of a Layer of Protection Analysis (LOPA).

 

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