Process Hazard Analysis (PHA) Study

What a PHA is

Process hazard analysis is the umbrella term for the structured review of hazards in a process, their causes, consequences and the protection layers in place. It is not a single technique - it is the family that HAZOP, HAZID, what-if analysis, checklist review and FMEA all belong to.

"We need a PHA" usually means "we need the right one of those, chosen for where this process actually is."

Choosing the technique

PHA revalidation

A PHA is a snapshot of the plant on the day it was done. Plants change - throughput creeps up, a catalyst changes, a bypass installed for a shutdown becomes permanent. Good practice is revalidation every five years or after any significant modification, and revalidation is usually far quicker than a fresh study because the node structure already exists.

What we deliver

• Independent facilitation with a dedicated scribe, so your engineers participate instead of taking minutes
• Worksheets covering cause, consequence, existing safeguards and residual risk
• A ranked, owned and dated action register - the part that determines whether anything actually changes
• Clear handover into SIL determination where a safety instrumented function is the protection layer