Process Safety Management Under 29 CFR 1910.119: Keeping the Cycles Running
If a covered process holds highly hazardous chemicals above threshold, PSM sets fourteen linked duties with fixed review cycles.
In Short
- Check thresholds per process.
- Revalidate PHAs every five years.
- Change goes through MOC.
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- Which rules reach your plant
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OSHA's process safety management standard applies to processes holding a listed highly hazardous chemical at or above its threshold, or 10,000 pounds or more of flammable liquid or gas. It sets linked elements, from process safety information to compliance audits, each with fixed cycles. This guide covers scope, the cycles and change management. It is orientation, not legal or engineering advice. Sources checked 4 Oct 2026.
Is the process covered?
Coverage is per process: a listed chemical at or above its Appendix A threshold, or a Category 1 flammable gas or flammable liquid with flashpoint below 100 °F in a quantity of 10,000 pounds or more in one location, with exceptions such as fuels used only for workplace consumption. Retail facilities, oil and gas well operations and normally unoccupied remote facilities are excluded.
More on is the process covered?
Record the scoping decision for each process.
The Elements Work Together
The standard covers employee participation, process safety information, process hazard analysis, operating procedures, training, contractors, pre-startup safety review, mechanical integrity, hot work permits, management of change, incident investigation, emergency planning and compliance audits, plus trade secrets. Each relies on the others: a PHA uses current process safety information, and its recommendations change procedures and training.
Fixed Cycles In 1910.119
| Element | Cycle |
|---|---|
| Process hazard analysis | Revalidate at least every 5 years |
| Operating procedures | Certify current every year |
| Refresher training | At least every 3 years |
| Compliance audit | Certify at least every 3 years; keep last two |
| Incident investigation | Start within 48 hours; keep report 5 years |
- Process hazard analysis
- Cycle
- Revalidate at least every 5 years
- Operating procedures
- Cycle
- Certify current every year
- Refresher training
- Cycle
- At least every 3 years
- Compliance audit
- Cycle
- Certify at least every 3 years; keep last two
- Incident investigation
- Cycle
- Start within 48 hours; keep report 5 years
Cycles to Keep
The PHA is updated and revalidated at least every five years. Operating procedures are certified current and accurate every year.
More on cycles to Keep
Refresher training is given at least every three years. Compliance is evaluated and certified at least every three years, keeping the two most recent audit reports. Incident investigations start within 48 hours and reports are kept five years.
Management of Change
Changes to chemicals, technology, equipment, procedures and facilities, other than replacement in kind, need written management of change: technical basis, safety and health impact, procedure updates, time period and authorisation. Affected employees and contractors are informed and trained before start-up, and process safety information is updated.
Management of Change, Worked Example
More on management of Change
New or significantly modified facilities need a pre-startup safety review.
Mechanical Integrity in Practice
Pressure vessels, piping, relief systems, controls and pumps need written procedures, trained staff, inspection and testing to recognised practice, and correction of deficiencies before further use or in a safe and timely way. Inspection records identify the equipment, date, inspector and results.
Questions
Does PSM cover every chemical plant?
No. Only processes above the thresholds in the standard. Some facilities are covered by EPA's Risk Management Program too.
How often is the PHA redone?
It is updated and revalidated at least every five years after the initial analysis, by a qualified team.
Is replacing a valve a change?
Not if it is replacement in kind. A different model or specification needs management of change.
Where does V5 fit?
V5 keeps controlled procedures, training records, maintenance and calibration, change control with approvals and incident CAPA. Your process safety team runs PHAs and decides.
Practical orientation, not legal advice. Rules differ by jurisdiction; your quality and compliance team decides what applies.
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