August 2002

Columns

HP Automation Safety: Are fire and gas systems SISs?

ISA 84.01 or IEC 61511 standards make no specific mention of "fire and gas (F&G)" systems. However, many are asking the question: Are F&G systems classified as safety systems? Why woul..

Goble, W., exida LLC

ISA 84.01 or IEC 61511 standards make no specific mention of "fire and gas (F&G)" systems. However, many are asking the question: Are F&G systems classified as safety systems? Why would one ask? The answer has a lot to do with another question: Must these systems be designed per IEC 61511? The question has a lot of significance, since some F&G systems cannot meet SIL1 requirements. Very few of the flame detector manufacturers or gas detector manufacturers have safety certified products. Many do not publish failure rate or failure mode numbers. Some are not even aware of the standards. So, is the F&G system an SIS? The

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