Functional Safety 2016

What you might see in an SRS

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Safety Function Description (SLATS)

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Measure the temperature in V23 and if it exceeds 360

C close the XYZ supply

valve within 30 seconds. The SIF must be SIL 2.

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The Functional Requirements

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The valve safe state is closed.

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The valve should close when the output is de-energised.

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The valve should have a leakage class of ..

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The Integrity Requirements

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The risk reduction factor

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The mode of operation and the demand rate

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Other points as per 61511

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The Operational Requirements

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Alarm X will be set if …

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The SIF can be bypassed with switch …