I just watched a film on that incident. Basically, because of cost cutting and lax maintenance, that refinery was an accident waiting to happen. BP made a big hullabaloo about a new commitment to saftey and following procedure. Apparently it was a sham.
Chem board report - TX City
http://www.csb.gov/assets/document/CSBFinalReportBP.pdf
Baker Report
http://www.csb.gov/assets/document/Baker_panel_report1.pdf
BP’s Internal Report - Tx City
The oil boys though play by a different set of rules.