Simplified Iec Risk | Assessment Calculator Sirac

Certain variables that require deep expert knowledge are set to conservative default values .

| Feature | SIRAC (IEC 62061) | ISO 13849-1 Graph | HRN / Matrix Methods | | :--- | :--- | :--- | :--- | | | Low (4 variables) | Medium (5 variables including training) | High (arithmetic scoring) | | Output | SIL / PLr | PLr | Risk Score (e.g., 12/25) | | Best For | Functional safety of control systems | Mechanical & pneumatic systems | General risk inventories | | Auditability | Excellent (clear logic) | Excellent | Poor (subjective numbers) | simplified iec risk assessment calculator sirac

The calculator gives you a nice number. "Risk reduced to tolerable." But does it account for common cause failure? Does it understand that your "simplified" operator response time isn't actually 10 seconds when they are tired on a night shift? SIRAC is a snapshot. Safety is a film. Never mistake a static calculation for dynamic safety culture. Certain variables that require deep expert knowledge are

Despite these warnings, SIRAC is a revolutionary tool for the 80% of machinery that doesn't need a full HAZOP study. It democratizes safety. It allows a plant manager to ask "Is this safe enough ?" without needing a PhD in reliability. Does it understand that your "simplified" operator response

Why should the average engineer care about the ? Because the law (EU Machinery Directive 2006/42/EC, UK PUWER 98, US OSHA General Duty Clause) requires a documented risk assessment.

: The value of the building's contents (e.g., flammable materials, electronics) and the number of people regularly inside.

: A definitive "Yes/No" statement on whether a protection system is mandatory. : Recommendations for Class I, II, III, or IV protection based on the required efficiency. Surge Protection (SPD)