Accident: Sterigenics Ethylene Oxide Explosion
Location: Location: Ontario, CA
Accident Occurred On: 08/19/2004 | Final Report Released On: 03/30/2006
Accident Type: Chemical Manufacturing - Fire and Explosion
Investigation Status: On March 30, 2006, the CSB issued its final report on the accident.
At approximately 3:00 p.m. on August 19, 2004, an explosion occurred inside an ethylene oxide sterilization chamber and an associated thermal oxidizer at the Sterigenics facility in Ontario, California. Four employees suffered minor injuries and the facility was rendered unusable.
In collaboration with other state/regional agencies as necessary, such as California Occupational Safety and Health Administration, recommend to facilities that treat ethylene oxide backvent emissions with oxidizing emissions control devices to evaluate current process controls and install appropriate safeguards, such as: - Real-time chamber and/or effluent concentration monitoring connected to alarms, interlocks, and/or fast acting control devices. - Post-ignition deflagration detection and damage control devices.
In collaboration with other state/regional agencies as necessary, such as California Environmental Protection Agency, identify the ethylene oxide sterilization facilities in California that utilize oxidizing emissions control devices and conduct inspections of those facilities (including the Sterigenics Ontario facility) in terms of the findings of this report. Ensure prompt correction of all violations identified during these inspections.
Communicate the findings and recommendations of this report to the states that require EO backvent emissions treatment. Emphasize the need for facilities to evaluate current process controls and install appropriate safeguards, such as: - Real-time chamber and/or effluent concentration monitoring connected to alarms, interlocks, and/or fast acting control devices. - Post-ignition deflagration detection and damage control devices.
Coordinate with NIOSH to revise and reissue Appendix C of the NIOSH Alert: Preventing Worker Injuries and Deaths from Explosions at Industrial Ethylene Oxide Facilities (Publication No. 2002-119) in terms of the findings of this report. Specifically, remove the portion of paragraph D that states, "[t]he accuracy, reliability, resolution, and availability of current ethylene oxide measurement devices is questionable."
Conduct outreach to communicate the findings and recommendations of this report, and the contents of the NIOSH Alert: Preventing Worker Injuries and Deaths from Explosions at Industrial Ethylene Oxide Facilities, to your membership.
Communicate the findings and recommendations of this report to your membership.
Review and revise NFPA 560, Standard for the Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigation in terms of the findings of this report. Specifically:
Revise and reissue the NIOSH Alert: Preventing Worker Injuries and Deaths from Explosions at Industrial Ethylene Oxide Facilities (Publication No. 2002-119) in terms of the findings of this report. Specifically: - Include industry guidance materials on Process Hazard Analysis (PHA), such as those published by the Center for Chemical Process Safety (CCPS).
Revise and reissue the NIOSH Alert: Preventing Worker Injuries and Deaths from Explosions at Industrial Ethylene Oxide Facilities (Publication No. 2002-119) in terms of the findings of this report. Specifically: - Add references to NFPA 68 Guide for Venting of Deflagrations; NFPA 69 Standard on Explosion Prevention Systems; NFPA 86 Ovens and Furnaces; and NFPA 560 Standard for the Storage, Handling, and Use of Ethylene Oxide for Sterilization and Fumigation.
Revise and reissue the NIOSH Alert: Preventing Worker Injuries and Deaths from Explosions at Industrial Ethylene Oxide Facilities (Publication No. 2002-119) in terms of the findings of this report. Specifically: - Coordinate with the Ethylene Oxide Sterilization Association (EOSA) to remove the portion of paragraph D of Appendix C that states, ?[t]he accuracy, reliability, resolution, and availability of current ethylene oxide measurement devices is questionable.?
Audit all Sterigenics ethylene oxide sterilization facilities using oxidizing emissions control devices. Ensure that audits assess the issues detailed below, under "Sterigenics International - Ontario Facility," and that necessary corrective measures are promptly implemented. Communicate results of these audits to your workforce.
Review and revise the Process Hazard Analysis (PHA) program to ensure that: - Hazardous scenarios are identified, evaluated, and documented. - Lessons learned from past incidents are applied, where appropriate.
Evaluate current process controls and install appropriate safeguards, such as: - Real-time chamber and/or effluent concentration monitoring connected to alarms, interlocks, and/or fast acting control devices. - Post-ignition deflagration detection and damage control devices.
Ensure that all employees with passwords capable of modifying the sterilization cycle sequence have process experience and training that enables them to make safe process decisions. Training should emphasize flammability hazards and the need for gas washes when the chamber is empty of products to be sterilized.
Ensure that the control room, and any other room where employees congregate in dangerous proximity to the sterilization area, is located and/or designed to protect workers from an explosion.
Communicate the findings and recommendations of this report to all employees, including operators and maintenance staff.