A fortunate fracture in a pressurized chemical tank near Los Angeles this week prevented what experts say would have been a catastrophic explosion, yet thousands of residents remain barred from returning to their homes as crews work to fully stabilize the vessel.
The tank at GKN Aerospace Transparency Systems in Garden Grove, Orange County, overheated last week when a cooling system valve failed. As methyl methacrylate, a highly flammable chemical used in plastics manufacturing, converted from liquid to gas inside the vessel, pressure mounted toward dangerous levels. But a crack that formed in the tank's wall allowed pressure to vent, likely preventing a major blast.
Initial evacuation orders covered 50,000 people in the area. Most were allowed to return home after the crack formed over Memorial Day weekend, but about 16,000 residents living closest to the aerospace plant remain under evacuation orders as of Tuesday. Officials said the risk of a smaller explosion or chemical spill was still too high to declare the area fully safe.
Crews have been cooling the tank with massive amounts of water since last week, spraying 1,250 gallons per minute for five days straight, totaling roughly 9 million gallons. By Tuesday, interior temperatures had dropped from over 100 degrees Fahrenheit to 92 degrees. Water and cooling efforts continue as the facility's sprinkler system and firefighters work to bring the temperature down further.
The tank holds between 6,000 and 7,000 gallons of methyl methacrylate. Exposure to the chemical can cause serious respiratory damage, neurological problems, and irritation to skin, eyes, and throat, according to the federal Environmental Protection Agency.
Andrew Whelton, an engineering professor at Purdue University who specializes in environmental contamination, confirmed the severity of what nearly happened. "The tank was on track for a catastrophic explosion," he said, noting that the crack's formation appears to have released enough pressure to avert the worst outcome.
However, Whelton warned that danger remains. A smaller explosion could still occur, potentially sending projectiles or a chemical plume toward nearby residences. Some methyl methacrylate may have already hardened into a stable plastic similar to plexiglass as temperatures fluctuated, which could reduce hazards. But the tank needs to cool to between 60 and 70 degrees Fahrenheit before conditions are considered significantly safer, he said.
Crews also worked overnight to neutralize two nearby tanks at the facility to prevent them from being affected by the compromised vessel. Material from one tank was transferred to another containing a neutralizing agent. Orange County Fire Captain Brian Yau said the precautions were essential given the chemical's volatility.
Air quality monitoring will continue for several months through the South Coast Air Quality Management District, while the EPA will inspect sewer and storm drains for potential spills.
The incident underscored broader industrial safety concerns. On the same day officials reported progress in California, a chemical tank implosion at a pulp and paper mill in Washington state injured at least 10 people, with an undisclosed number killed or reported missing.
Author James Rodriguez: "A cooling system failure nearly turned an aerospace plant into a disaster zone, and only a random crack in the tank's wall stood between thousands of residents and catastrophe."
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