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eng.LOPA-protection-layer Calculator
Calculates the required Probability of Failure on Demand (PFD) for a Safety Instrumented Function (SIF) from LOPA analysis. LOPA (Layer of Protection Analysis) quantifies risk reduction — each independent protection layer (IPL) divides the unmitigated event frequency.
Inputs
Initiating Event Freq
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Demand Rate Pfd1
Reference formula or conversion factor shown for context.
Demand Rate Pfd2
Reference formula or conversion factor shown for context.
Consequence Category
Reference formula or conversion factor shown for context.
Results
mitigated consequence frequency (1/yr)
The value at the specified point or condition.
tolerable frequency for cat
The value at the specified point or condition.
risk tolerable?
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.
IEC 61511 LOPA method
The recommended calculation method or analytical approach for these conditions.
SIL required
Reference formula or conversion factor shown for context.
PFD to SIL
Reference formula or conversion factor shown for context.