Explosion fears tempered as possible crack seen in failing Calif. tank - UPI.com

Crack in unstable California chemical tank may reduce explosion risk, official says

A crack found in the overheating 7,000-gallon methyl methacrylate tank at GKN Aerospace in Garden Grove may be naturally relieving internal pressure, prompting authorities to reassess their containment strategy as 50,000 Orange County residents remain evacuated. Industrial facility managers should note the incident as a case study in chemical storage valve failure cascades — gummed relief valves prevented thermal control, escalating a routine vapor release into a multi-day mass evacuation event.