lopa-worksheet

To build a compliant LOPA worksheet per IEC 61511, you must supply verified initiating event frequencies, IPL independence tests, and PFD values. The skill structures this data into a single-scenario worksheet, marking any unsupplied inputs as [GAP] to prevent fabricated safety values.

Structuring a single-scenario Layer of Protection Analysis involves defining one named hazard scenario, then providing engineer-verified initiating event frequencies and independent protection layer data. The skill enforces this by eliciting required inputs one question at a time to eliminate vague or non-specific entries.

No, this LOPA worksheet tool does not calculate PFD values or allocate SIL targets. It enforces assistive discipline by leaving all unsupplied safety values as [GAP], requiring a competent functional safety engineer to supply the data and perform pre-output review.

Generic AI tools often produce non-compliant process safety documentation by skipping de-identification or fabricating safety values. This skill enforces mandatory de-identification of personal data and validates the hierarchy of controls to ensure compliant hazard analysis output.

Yes, you need a functional safety engineer for pre-output SME review. The skill requires a LOPA/SIL competent person to verify the worksheet, ensuring the initiating event frequencies, IPL independence tests, and hierarchy of controls validation meet IEC 61511 standards.

You should flag administrative-only protection layers during hazard analysis when ranking independent protection layers against the hierarchy of controls. This validation step ensures your LOPA worksheet accurately identifies weaker administrative IPLs within the safety compliance review.