Process Safety with Trish & Traci Revalidating Process Hazard Analysis: Getting Real Value
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Feb 10, 2026 Trish Caron, Director of Lead Like Caron and process-safety expert, discusses making PHA revalidations truly valuable. She covers Delta HAZOP for spotting creeping change. She explains when to redo versus revalidate and who should sit on teams. She outlines choosing methods and using AI to gather trends while keeping human judgment central.
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Revalidate Regularly And After Major Changes
- Revalidate PHAs at least every five years or when laws or significant operational changes require it.
- Use revalidation to confirm existing risk controls and to catch hazards that emerge over time.
Delta HAZOP Targets Creeping Change
- Revalidations differ from redos: revalidation checks prior reports while redos start from scratch.
- Delta HAZOP focuses on creeping changes and can reveal hazards missed by standard HAZOPs.
Prepare Thoroughly To Shorten Workshops
- Invest effort in preparatory data collection to shorten and focus workshops.
- Have one or two people gather detailed info so the multi-person workshop runs fewer days.