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..
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 Many do not
publish failure rate or failure mode numbers.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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