Southern California chemical tank crisis: Risk of explosion eliminated — But emergency not over | Today’s news
A potentially catastrophic chemical emergency in Southern California was greatly eased on Monday (May 25) after firefighters confirmed the pressure inside an overheating industrial tank was released through a crack in the container, greatly reducing the risk of an explosion.
The incident took place at a manufacturing facility operated by GKN Aerospace in Garden Grove, California, where a large storage tank containing thousands of gallons of methyl methacrylate – a highly flammable industrial chemical used in the production of plastics – overheated and began releasing fumes.
Although authorities say the immediate risk of an explosion has decreased, evacuation orders affecting roughly 50,000 residents remain in place as crews continue to monitor the site.
What happened?
The emergency began on Thursday when a chemical storage tank at the GKN Aerospace Transparency Systems facility began to overheat.
The tank contained 6,000 to 7,000 gallons of methyl methacrylate (MMA), a chemical commonly used to make acrylic plastics and transparent parts for commercial and military aircraft.
As the temperature inside the tank increased, the chemical began to release vapors – a warning sign that pressure was building in the sealed container.
Firefighters responded by constantly spraying the tank with water to cool it and prevent what experts feared could become a massive industrial explosion.
On Sunday, officials said the internal temperature had soared to about 100°F (37.7°C), raising concerns that the tank could burst violently.
Why was he afraid of the explosion?
The danger came from the behavior of methyl methacrylate when heated.
As MMA heats up, it can change from a liquid to a gas, causing pressure to quickly build up inside the sealed container. If the pressure rises beyond what the tank can withstand, the container may burst explosively.
Technical experts compared the scenario to an overheated soda can.
The crack discovered in the tank turned out to be unexpectedly beneficial, allowing the pressure and gas to gradually escape rather than build up to explosive levels.
By Monday morning, officials said the temperature in the reservoir had dropped to 93°F (33.9°C) and the release of pressure had dramatically reduced the likelihood of a catastrophic explosion.
Orange County Fire Chief Craig Covey described the overnight findings as “incredibly positive news.”
Why did the firemen wait until night
Crews postponed detailed inspection operations until the night as the heat of the day made conditions around the reservoir significantly more dangerous.
At night, cooler ambient temperatures reduced the risks to firefighters and allowed teams to safely approach the container, take temperature readings and confirm that the crack was releasing pressure.
Drones were also deployed to monitor the tank every 10 minutes for temperature spikes.
Officials additionally installed barriers around storm drains and waterways to prevent environmental contamination should a spill occur.
What is methyl methacrylate?
Methyl methacrylate is an industrial chemical used to make acrylic plastics, resins, paints, and transparent aircraft parts.
It is highly flammable and can pose serious health risks when inhaled in significant concentrations.
Potential health effects include:
– Respiratory tract irritation and breathing problems
– Eye, skin and throat irritation
– Neurological symptoms such as headaches or dizziness
– Nausea and chemical sensitivity
MMA has a strong odor and can be smelled over wide areas even at concentrations below harmful levels.
Why are there still evacuations?
Despite the improved outlook, authorities have not yet lifted evacuation orders because:
– The tank still contains hazardous material
-The structural integrity of the vessel remains uncertain
– Chemical leakage remains possible
– Conditions may change if temperatures rise again
Impact on surrounding communities
Garden Grove is located next to Anaheim, where the Disneyland Resort is located. Officials said the Disney parks were not in an evacuation zone, although park operators were closely monitoring developments.
Still, the emergency has disrupted thousands of homes and businesses across the region.
Lawsuit filed against GKN Aerospace
Some evacuated residents filed a federal class-action lawsuit against GKN Aerospace Transparency Systems over the incident.
Regardless of whether an explosion occurs, the lawsuit claims, the emergency itself could reduce nearby property values and expose residents to long-term environmental stigma.
GKN Aerospace apologized to residents and said it was “working around the clock” to reduce risks.
