14 PSM Elements
11. Incident Investigation
The PSM standard requires employers to investigate any incident—or near miss—that resulted in, or could reasonably have resulted in, a catastrophic release of a highly hazardous chemical. These investigations must begin no later than 48 hours after the event to ensure that evidence, observations, and employee recollections remain accurate and complete.
In the oil and gas industry, incident investigation plays a critical role in analyzing equipment failures, unexpected pressure releases, loss-of-containment events, flare system upsets, ignition incidents, or unsafe operating deviations. For example, even a small vapor release from a pump seal or flange may trigger an investigation if it had the potential to escalate into a fire or explosion. Investigations help operators uncover underlying issues such as corrosion under insulation (CUI), inadequate procedures, instrumentation failures, improper isolation techniques, or human-factor contributors like inadequate training or fatigue.
Examples: After a near-miss H₂S release in a sour gas plant, a team identifies root causes like valve failure, recommending safeguards; reports are shared with affected workers.
12. Emergency Planning and Response
PSM-covered storage facilities must meet OSHA emergency planning requirements, including having an Emergency Action Plan, alarm systems, employee training, and procedures for reviewing the plan. Facilities may also be covered by HAZWOPER. Emergency plans should address how to report emergencies, handle small releases, evacuate, perform critical operations before evacuation, account for employees, conduct rescue or medical duties, and identify responsible personnel.
Storage tanks must be labeled per OSHA’s Hazard Communication standard so responders can identify hazards. OSHA recommends tracking locations of portable containers and coordinating with local emergency responders, including conducting practice drills. Contractors and visitors must know how to respond in emergencies; employers may assign escorts or wardens and provide evacuation instructions.
Examples: Refinery plans outline evacuation for HF releases, with procedures for reporting and accounting personnel during hurricanes affecting coastal facilities.
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7-7. When must an employer begin an incident investigation after an event or near miss?
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