LOPA Layer of Protection Analysis - Online Calculator

🔒 Please log in to use tool features (fill sample / analyze / AI interpretation / export document)

🛡️ LOPA Layer of Protection Analysis

Initiating event frequency × IPL PFD → residual risk frequency and compliance check

🔧 All Tools

Scenario Input

Initiating Event Frequency (events/yr)

Tolerable Frequency (events/yr)

+ Independent Protection Layer IPL (name + type auto-fills PFD)

Protection Layer Name

Type

PFD

Protection Layers Added

#	Name	Type	PFD

Notes

· Residual risk frequency = initiating event frequency × product of all IPL PFDs; each IPL must be effective, independent, and auditable (the three IPL attributes).

· Typical PFD values: Inherent Safety (0.1), BPCS Basic Process Control (0.1), Alarm + Operator Response (0.1), SIF/Safety Relief Valve (0.01), Rupture Disk (0.001).

About LOPA Layer of Protection Analysis

Run layer of protection analysis per IEC 61511: enter independent protection layer PFDs, compute risk reduction factor and support SIL rating.

Learn more about this tool →

HAZOP Hazard & Operability Study SIL Safety Integrity Level RBI Risk-Based Inspection FMEA Generator (DFMEA/PFMEA) PFD & SIL Verification

← Back to all quality tools