Definition:
A Risk Graph is a qualitative tool used to estimate required SIL levels by mapping severity, frequency, and exposure factors. It is a common approach along with a LOPA, and a bit easier.
Do not confuse with a Risk Matrix!
Key Points:
- Simpler and faster than QRA.
- Frequently used early in project hazard assessments.
- Often used in machinery safety.
Example:
A high-consequence, high-frequency event may map to a SIL 3 requirement using a Risk Graph.
See also: Risk Matrix, LOPA
Cited Source:
- IEC 61508-5:2010, Annex D.