Lessons from blast: CSB video explores gas detection and emergency plans
Another riveting video is posted by the Chemical Safety and Hazard Investigation Board (CSB)! The animated video covers a massive explosion at a Texas machine shop. Two workers and a member of the public were killed. Over 450 neighboring homes/businesses were damaged.
Video supports investigative report
The 14-minute video, “No Detection: Explosion …,” follows a June 2023 investigation report. When the 56-page report came out, CSB Chairperson Steve Owens said, “Our investigation found that [the company] did not have an effective program in place to assess potential hazards in its propylene process and did not have a mechanical integrity program or written operating procedures.”
The incident was compounded by emergency planning failures, says CSB. Owens argued, “This tragic incident was made even worse due to the lack of emergency response training for employees at the facility.”
Deadly incident
CSB explains that a degraded and poorly crimped rubber welding hose disconnected from its fitting inside a coating booth. That prompted a release of propylene, a flammable vapor.
By the time workers arrived at the facility the early morning of January 24, 2020, an explosive concentration of propylene had formed inside the building. As workers entered and turned on the lights, the vapor ignited, triggering an explosion. It:
- Killed two workers,
- Injured two other workers,
- Fatally injured a nearby resident, and
- Damaged hundreds of structures.
The board’s investigation later found that the company had:
- Disconnected gas detectors from a computer control system. This meant the automatic gas detection shutoff system would not alert operators to a leak. It also would not start up exhaust fans or trigger two shutoff valves to stop the flow of propylene.
- Replaced a copper tubing connection with a rubber welding hose. Rubber hose is not recommended for propylene. Oils in the gas can cause a rubber hose to form cracks and lose pliability.
OSHA citations before/after the incident
OSHA cited the company 12 years earlier for failing to inspect gas system equipment for signs of deterioration or leaks. The 2008 OSHA visit was prompted by another explosion of propylene gas.
Following the later 2020 incident, OSHA issued citations for failing to:
- Provide effective training on chemical hazards,
- Prevent explosive concentrations from accumulating,
- Ensure coating equipment was maintained gas-tight, and
- Ensure the manual shutoff valve at the propylene storage tank was closed at the end of each workday.
Safety issues found by CSB
CSB explains that the shop’s propylene amount was below the threshold for OSHA’s Process Safety Management (PSM) standard at 29 CFR 1910.119 or EPA’s Risk Management Plan (RMP) standard at 40 CFR 68. Still, the CSB investigation identified these safety issues:
- PSM — Had the company had an effective PSM program to identify and control hazards, it could have prevented the incident. Suggested PSM program elements included process safety information, process hazard analysis, management of change, mechanical integrity, and operating procedures.
- Emergency planning — The company’s emergency response plan did not address responding to a propylene gas leak. The company also failed to train its workers to recognize or respond to a propylene gas release. Hence, workers did not evacuate from the area after suspecting a propylene leak nor contact responders for help.
Owens concludes that the deadly incident could have been mitigated if the company had implemented an effective PSM system for the hazards of its coating operation. Even if a leak occurred, Owens believes an emergency response plan could have prevented the tragic loss of life.
OSHA chemical emergency preparedness may include an emergency action plan and/or an emergency response plan.
Lessons for industry
To prevent chemical incidents, CSB urges you to:
- Ensure the safety of workers who handle hazardous chemicals (and protect surrounding communities). This is regardless of whether or not the chemicals meet the threshold under PSM and RMP standards.
- Ensure gas detection, alarm, exhaust, and shutdown systems are adequately designed, maintained, inspected, and tested. The idea is to ensure reliability if your facility handles hazardous chemicals.
- Ensure a written emergency response plan is implemented. Also, ensure that it adequately addresses all actions to be taken in a release. Workers too need to be trained in the plan and participate in periodic drills.
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CSB videos are recognized
The latest video comes after the board received a “Silver Play Button” award. The CSB’s video channel boasts 364K subscribers and nearly 100 safety videos. The channel has had over 65M combined views since 2007. What’s more, CSB claims that the chemical industry itself and engineering schools use the videos for chemical safety training.
Key to remember
A new CSB video covers the 2020 massive explosion at a Texas machine shop. The board urges you to implement PSM systems even if not required. CSB also presses you to ensure that workers are trained in emergency response plans.