Corrosion - cause of refinery fire?

 Preliminary investigations by the CSB indicate that corrosion could be the reason for the recent large fire at a refinery in USA. The 8" pipe that failed also had a 12" pipe connected to it. In a turnaround in 2011, the 12" pipe was replaced due to corrosion.  A news article mentions the following "The pipe that failed Monday dated back to the 1970s, investigators said, but it is still unclear whether the thickness testing conducted by Chevron in its last major inspections noted corrosion in that specific, 8-inch pipe". Read the news article in this link.


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