From the CSB Press Release about the root cause analysis of the BP Texas City Refinery explosion, I found the following comment:By March 23, operators had been working 12-hour shifts for 29 or more consecutive days.  “Fatigue causes cognitive fixation and impaired judgment and could lead operators to fixate on one operational parameter – such as the apparently declining liquid level – to the exclusion of other indicators,” Ms. MacKenzie said….  Fatigue prevention regulations have been developed for aviation and other transportation sectors, but there are no fatigue prevention guidelines that are widely used and accepted in the oil and chemical sector.- – -29 days on 12-hour shifts….  And firing the operators and supervisor after the accident make much less sense.If you are interested in a way to judge if fatigue is a cause of an incident, you should attend the TapRooT® Summit to hear Bill Sirois talk about the FACT technique for assessing fatigue during an accident investigation.