Copyright © Risknowlogy®. All rights reserved. v9
What you might see in an SRS
‣
Safety Function Description (SLATS)
‣
Measure the temperature in V23 and if it exceeds 360
o
C close the XYZ supply
valve within 30 seconds. The SIF must be SIL 2.
‣
The Functional Requirements
‣
The valve safe state is closed.
‣
The valve should close when the output is de-energised.
‣
The valve should have a leakage class of ..
‣
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 …
‣
The SIF can be bypassed with switch …
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