With the release of the CSB accident report involving the catastrophic failure of an ASME pressure vessel and me posting it this afternoon, I am already getting e-mails (5 and counting within the first two hours) claiming the incident is “1 in a million” and that I am scaring people for no sound reason. Really? How often do we think accidents involving a pressure vessel occurs? Do we actually think they are truly 1 in a million or at some other frequency? Well, here is the actual data over a 10 year period (1992-2001) from the National Board of Boiler and Pressure Vessel Inspectors…