Presentation on theme: "Fatal Incident Involving a Temporary Enclosure at a Chemical Facility From an OSHA Technical Information Bulletin."— Presentation transcript:
Fatal Incident Involving a Temporary Enclosure at a Chemical Facility From an OSHA Technical Information Bulletin
Purpose Provide information Hazard alert Requirements and regulations Recommendations and guidance Other information
Incident Description Facility unit undergoing a turnaround. 2 workers to inspect the flange surfaces of an open 48-inch piping system. Piping system opened to remove a piece of process equipment for cleaning.
Incident Overview N 2 Injection Reactor w/new catalyst Open 48" Piping Open Valve Closed Valve N 2 Venting Note: Actual process/piping significantly more complex. N 2 injection point 150' and several stories in elevation from pipe opening. North South
Incident Overview Nitrogen Purge Reactor with Catalyst Open valves to north side open piping In-Line Mixer (removed) Black Tarp
Incident Description Southside open pipe & enclosure Midday black light inspection. Black tarps draped to block light. Workers entered enclosure. No problems with inspection.
Incident Description North side open pipe & enclosure Midday backlight inspection. Black tarps draped to block light. Workers entered enclosure. Workers overcome upon entering.
Incident Conclusions One worker died, another hospitalized. N 2 throughout system. Piping system was not straightforward. OSHA cited the employer for 1910.146 Permit-Required Confined Space violations.
Nitrogen Hazard Can’t be detected by human senses N 2 displaces oxygen in enclosures (confined spaces) resulting in oxygen- deficient atmospheres
Human Response to Oxygen- Deficient Atmospheres Atmospheric Oxygen Concentration [%O 2 ] Possible Consequences 19.5 Meets OSHA minimum requirements for worker protection 8-10 Unconsciousness without warning; so quickly that individuals cannot help or protect themselves 6-8Fatal injury < 6 minutes 4-6Coma < 40 seconds with subsequent death
Requirements, Recommendations & Guidance If space meets the definition of a PRCS, must follow 1910.146. Even if not technically a PRCS, 1910.146 recommended. Other OSHA standards may apply: 1910.134 – Respiratory Protection IDLH Atmospheres Recognition that temporary enclosures may be PRCSs.
Requirements, Recommendations, & Guidance Comprehensive confined space training. Particular attention on hazardous atmospheres
Related Information OSHA Technical Information Bulletin on incident at: http://www.osha.govhttp://www.osha.gov CSB Morten Report at: http://www.csb.gov/reports/1998/union_carbid e/98005lafr.htm OSHA PRCS Standard, Directive and Interpretation at: http://www.osha.gov
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