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Free Compliance Tool

PHA Revalidation
Due Date Calculator

Track every covered process in one place. Enter your last PHA completion date and instantly see your 5-year revalidation deadline, days remaining, and status.

29 CFR 1910.119(e)(6)
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# Process / Unit Name Last PHA / Revalidation Date Revalidation Due Days Remaining Progress (5-yr cycle) Status
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The 5-year revalidation clock runs from the date of PHA completion, per 29 CFR 1910.119(e)(6). This tool does not constitute legal advice — verify all dates against your actual PHA documentation.

What Is PHA Revalidation?

The regulation, the rules, and what OSHA actually expects.

At least every five (5) years after the completion of the initial process hazard analysis, the process hazard analysis shall be updated and revalidated by a team meeting the requirements in paragraph (e)(4) of this section, to assure that the process hazard analysis is consistent with the current process.

— 29 CFR 1910.119(e)(6)

The 5-Year Clock

The clock starts from the date the PHA was completed, not the date it was scheduled, initiated, or approved. An initial PHA completed August 15, 2021 must be revalidated no later than August 15, 2026 — regardless of when work began.

Update vs. Full Redo

A revalidation does not require a complete new PHA. Per OSHA's interpretation, you must: (1) address changes made to the process since the last PHA, and (2) verify the prior analysis still accurately reflects current hazards and controls. A full redo is only required if the existing PHA no longer meets § 1910.119(e)(3).

Team Requirements

The revalidation team must meet the same requirements as the initial PHA team: at least one person with process-specific experience, and at least one person knowledgeable in the PHA methodology being used. A revalidation conducted without process-knowledgeable operators is a common citation.

Documentation

All PHAs, updates, and revalidations — plus the documented resolution of recommendations — must be retained for the life of the process. You cannot delete or discard prior PHA studies even after revalidation. An overdue revalidation or missing documentation is a citation on any OSHA inspection.

MOC Triggers

A significant change to a process may trigger a PHA review outside the 5-year cycle. Under § 1910.119(l) (Management of Change), any change that affects process safety information may require the PHA to be updated before startup. MOC and PHA revalidation schedules must be managed together.

Planning Timeline

A HAZOP revalidation for a complex process typically requires 3–6 months of preparation — assembling the team, securing P&IDs, gathering action item closure records, and scheduling sessions. Start planning at least 12 months before the due date to avoid a compliance gap.

Common Questions

What if we made major process changes — do we still just update?
Significant changes may require a more comprehensive analysis rather than a simple update. If the process has changed so substantially that the prior PHA no longer accurately reflects the current hazards, OSHA expects you to conduct analysis proportionate to the change. MOC procedures should have triggered interim PHA reviews at the time of each major change. If those were skipped, a more thorough revalidation is appropriate.
Can we use a different methodology for revalidation than we used originally?
Yes. The revalidation team may select the methodology they believe is appropriate for the current process complexity. OSHA does not require you to use the same method used in the original PHA. HAZOP is common for complex continuous processes; What-If/Checklist is often used for simpler systems. The CCPS Guidelines for PHA Revalidations provides detailed guidance on methodology selection.
What does "completion" mean for the 5-year clock?
OSHA interprets "completion" as the date the PHA team's analysis work is finished and documented — not the date management reviews or approves recommendations. Use the date reflected in the PHA report as the completion date. When in doubt, use the date the written report was finalized.
Do new processes get a grace period before their first PHA?
No. For existing processes, the initial PHA was due by May 26, 1997 (the PSM standard's phased implementation deadline). For newly covered processes — either newly constructed or newly covered due to a change in chemical inventory — a PHA must be completed before the process begins operation. There is no grace period.
Does the 3-year compliance audit affect the PHA revalidation schedule?
They are separate requirements on different cycles. The compliance audit (§ 1910.119(o)) must occur at least every three years and covers all 14 PSM elements including whether PHAs are up to date. An overdue revalidation will be cited during a compliance audit, and OSHA inspections frequently use audit findings as a roadmap for citations.
Need Expert Help?

PHA Revalidation Is What We Do

SafeGuard PSM provides PHA facilitation, revalidation scoping, team support, and recommendation management for facilities across the U.S. Whether you're starting from scratch or working with a prior study, we keep you on the right side of the 5-year clock.

Talk to SafeGuard PSM →