Authorities in southern California are cautiously optimistic after a damaged chemical tank at an aerospace facility cracked over the weekend, potentially preventing a catastrophic explosion that had forced tens of thousands to abandon their homes.
The tank, located at GKN Aerospace Transparency Systems in Garden Grove, began overheating Thursday and started venting vapors. By Sunday, roughly 50,000 residents in the city of 170,000, situated 40 miles south of downtown Los Angeles, had evacuated.
The crack discovered over the weekend offered a critical safety valve. As the internal temperature of the tank rose, pressure built inside the vessel containing 6,000 to 7,000 gallons of methyl methacrylate, the chemical used to manufacture plastic aircraft parts. The crack allows that pressure and chemical vapors to escape rather than accumulating to dangerous levels.
"Think of a soda can," said Andrew Whelton, an engineering professor at Purdue University, explaining the principle. "If you leave it in a hot car it can explode. But if you put a hole in the can, the product is released and the can itself doesn't explode."
Fire teams planned to send crews overnight Sunday to confirm pressure relief and assess whether the immediate danger had passed, Orange County Fire Authority interim Chief TJ McGovern said in a statement. The tank's interior temperature had climbed from 90 degrees Fahrenheit on Saturday to 100 degrees on Sunday.
Firefighters have been continuously spraying the tank with water to slow the temperature rise. Drones monitored the temperature every 10 minutes, watching for sudden spikes. Containment barriers were erected to prevent any chemical spill from reaching storm drains or nearby waterways.
No injuries have been reported. Air quality testing around the evacuation zone showed pollution levels within normal limits, according to state and federal environmental officials.
Exposure to methyl methacrylate carries serious health risks, including respiratory damage, neurological effects, and irritation to skin, eyes, and throat. The chemical's tendency to convert from liquid to gas as temperatures rise was the core threat: higher temperatures meant higher pressure, increasing explosion risk.
Evacuees sheltered at schools and community facilities in nearby communities, with some sleeping in cars and on mats on asphalt parking lots. Disneyland, located in neighboring Anaheim, was not under evacuation orders, though park officials said they were monitoring developments.
On Saturday, some Garden Grove residents filed a federal class action lawsuit against GKN Aerospace Transparency Systems. Lawyers argued that even if the immediate crisis resolves without incident, property values in the surrounding area will suffer lasting damage.
GKN Aerospace did not respond to the lawsuit but issued an apology to displaced residents and businesses. The company said Sunday it was "working around the clock to mitigate the risk of a leak."
Author James Rodriguez: "The crack in that tank may have saved the neighborhood from disaster, but Garden Grove residents will be asking hard questions about how a chemical facility in a city of 170,000 was allowed to operate without better safeguards."
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