What Changes Between Revalidation Cycles
Between scheduled PHA revalidations, facilities accumulate incremental changes, near misses, staff turnover, and shifting operating conditions — any one of which can invalidate an assumption the original study relied on.
Treating revalidation as a formality rather than a genuine re-examination is one of the more common ways facilities carry forward risk they believe is already managed.
Doing Revalidation Properly
A strong revalidation cycle starts by pulling incident, near-miss, and MOC records from the intervening years, rather than starting from a blank worksheet and hoping the team remembers what's changed.
The goal isn't to reproduce the original HAZOP faster — it's to specifically hunt for what's different now, since that's where new risk actually hides.
