OSHA term · Glossary
Process Safety Management (PSM)
Verified vs OSHA sources · 2026-10-05
OSHA's standard (29 CFR 1910.119) for preventing catastrophic releases of highly hazardous chemicals — toxic, reactive, flammable, or explosive substances that can cause a major fire, explosion, or toxic cloud. PSM applies when a process involves a listed highly hazardous chemical at or above its threshold quantity (Appendix A), or a Category 1 flammable gas or a flammable liquid (flashpoint below 100°F) present in one location at 10,000 pounds or more. It requires an integrated program of 14 interrelated elements, from process hazard analysis to mechanical integrity to management of change.
Also known as: PSM, process safety management of highly hazardous chemicals
On this page
Process Safety Management (PSM) at a glance
- Coverage trigger: a highly hazardous chemical at/above its Appendix A threshold quantity, OR 10,000+ lb of a Category 1 flammable gas / flammable liquid (flashpoint < 100°F) in one location.
- 14 elements: employee participation, process safety information, PHA, operating procedures, training, contractors, pre-startup safety review, mechanical integrity, hot work permit, management of change, incident investigation, emergency planning, compliance audits, trade secrets.
- Process Hazard Analysis (PHA) must be updated and revalidated at least every 5 years.
- Compliance audits must be conducted at least every 3 years.
- Incident investigation must begin no later than 48 hours after the incident.
- Management of Change (MOC) requires reviewing safety impacts before any change to process chemicals, technology, equipment, or procedures.
- PSM was promulgated in 1992 after catastrophic releases such as Bhopal (1984) and Phillips 66 (1989).
In plain English
The safety-management system for facilities that handle large quantities of dangerous chemicals — refineries, chemical plants, and similar operations. Because a single failure can level a plant and a neighborhood, OSHA requires 14 coordinated controls: know your process, analyze the hazards, write procedures, train workers, maintain equipment, and rigorously review any change before it is made.
What the source says, in summary
This section applies to... a process which involves a Category 1 flammable gas... or a flammable liquid with a flashpoint below 100 °F (37.8 °C) on site in one location, in a quantity of 10,000 pounds (4535.9 kg) or more.
In context
An enforcement, recordkeeping, or general-duty concept under the Occupational Safety and Health Act and 29 CFR. These terms define how OSHA inspects, cites, and penalizes employers.
Where this is written in OSHA's rules
- 29 CFR 1910.119Read on eCFR / OSHA.gov
- 29 CFR 1910.119(a)(1)Read on eCFR / OSHA.gov
Example
A chemical plant stores 15,000 lb of anhydrous ammonia — above its Appendix A threshold — so the process is PSM-covered. The plant maintains complete process safety information (P&IDs, chemical data, safe operating limits), conducts a PHA every 5 years using HAZOP methodology, audits compliance every 3 years, and runs every proposed equipment or procedure change through a formal Management of Change review before implementation. When a heat exchanger is replaced with a different model, MOC requires re-evaluating the hazard analysis before the new unit is placed in service.
Why it matters
PSM-covered processes are those with the potential for catastrophic, multi-fatality events — the kind that destroy facilities and harm surrounding communities. The standard's disciplined, systems-based approach exists precisely because informal safety management repeatedly failed to prevent disasters. PSM citations carry serious consequences, and the standard is closely tied to the EPA's Risk Management Program (RMP), which addresses off-site consequences of the same chemicals.
PSM (OSHA) vs. RMP (EPA)
OSHA's Process Safety Management standard (1910.119) protects WORKERS inside the facility from catastrophic chemical releases. EPA's Risk Management Program (RMP, 40 CFR Part 68) protects the SURROUNDING COMMUNITY and environment from the same releases. The two programs cover overlapping chemicals and share concepts (process hazard analysis, prevention program), but they are enforced by different agencies with different focus. A facility handling regulated quantities often must comply with both. PSM is not a general chemical-inventory rule — it applies only above specific threshold quantities.
PSM Key Timeframes & Triggers (29 CFR 1910.119)
| Requirement | Threshold / Frequency |
|---|---|
| Flammable coverage trigger | 10,000 lb Category 1 flammable gas / flammable liquid (< 100°F) in one location |
| Listed HHC coverage trigger | At or above Appendix A threshold quantity |
| PHA update / revalidation | At least every 5 years |
| Compliance audit | At least every 3 years |
| Incident investigation start | No later than 48 hours after the incident |
Process Safety Management (PSM): frequently asked questions
- What triggers PSM coverage?
- A process is PSM-covered if it involves a highly hazardous chemical listed in Appendix A at or above its specified threshold quantity, OR involves a Category 1 flammable gas or a flammable liquid with a flashpoint below 100°F present on site in one location in a quantity of 10,000 pounds or more. Certain retail facilities, oil/gas well drilling, and normally unoccupied remote facilities have specific exemptions.
- How often must the process hazard analysis be updated?
- At least every 5 years. Under 1910.119(e)(6), the PHA must be updated and revalidated at least every five years after completion of the initial analysis, by a team with expertise in the process, to ensure it remains consistent with the current process. This is separate from the every-3-years compliance audit requirement.
- What are the 14 elements of PSM?
- Employee participation; process safety information; process hazard analysis (PHA); operating procedures; training; contractors; pre-startup safety review; mechanical integrity; hot work permit; management of change (MOC); incident investigation; emergency planning and response; compliance audits; and trade secrets. These elements are interdependent — PSM works as an integrated management system, not a checklist of separate tasks.
Related terms
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Area DirectorThe senior OSHA official in charge of a specific OSHA Area Office — the local unit that runs inspections and enforcement in its geographic territory. The Area Director has the authority to issue citations, propose penalties, hold informal conferences with employers, and approve settlement agreements. When a Compliance Safety and Health Officer (CSHO) completes an inspection, it's the Area Director who ultimately issues the citation.
Bureau of Labor Statistics (BLS)The federal statistical agency within the U.S. Department of Labor that collects, analyzes, and publishes data on workplace injuries, illnesses, and fatalities. BLS conducts the annual Survey of Occupational Injuries and Illnesses (SOII) — compiled from employer OSHA 300 logs — and the Census of Fatal Occupational Injuries (CFOI). SOII data drives OSHA's Site-Specific Targeting (SST) program: establishments whose DART rates significantly exceed their BLS industry average are placed on the SST inspection list.
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CitationThe formal written notice OSHA issues to an employer after an inspection, describing each alleged violation, the standard cited, the proposed penalty, and the date by which the hazard must be corrected (abated). OSHA must issue a citation with reasonable promptness and no later than six months after the violation occurred.
Closing ConferenceThe meeting at the end of an OSHA inspection where the compliance officer confers with the employer and informally advises them of any apparent violations found. Importantly, the closing conference discusses what was observed and the employer's rights — but it does NOT state final citations or penalties, which come later in the written Citation and Notification of Penalty.
Compliance Officer (CSHO)An OSHA Compliance Safety and Health Officer — the inspector who conducts workplace inspections. A CSHO presents credentials (a photo ID and a serial number), holds the opening conference, performs the walkaround, collects evidence, interviews employees, and recommends citations. CSHOs are either safety specialists or industrial hygienists.
ContestAn employer's formal challenge to an OSHA citation, penalty, or abatement date. To contest, the employer must file a written Notice of Contest with the OSHA Area Director within 15 working days of receiving the Citation and Notification of Penalty. Filing sends the case to the independent Occupational Safety and Health Review Commission (OSHRC); missing the deadline makes the citation a final, un-appealable order.
Sources & verification
- 29 CFR 1910.119 (eCFR / OSHA.gov)
- 29 CFR 1910.119(a)(1) (eCFR / OSHA.gov)
- OSHA — 29 CFR 1910.119 (Process Safety Management)
- OSHA — Process Safety Management (Safety Topics)
Reviewed by HazComFast against eCFR, OSHA.gov, NIOSH, and the Federal Register. Last reviewed 2026-10-05. This glossary is general information, not legal advice; OSHA State-Plan states (e.g. California, Michigan) may adopt stricter requirements.
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