Browse Issue Articles in this Issue Are unconfined hydrogen vapor cloud explosions credible? Comment related to December 2014 PSP Bhopal articles Enterprise PSM development, implementation, and auditing Erratum Impact of DDT on FPSO explosion risk assessment Lac - Mégantic accident: What we learned On - going developments in addressing combustible dust hazards Organizational change management for process safety Prediction of methane's flammability using chemical equilibrium Properly calculate vessel and piping wall temperatures during depressuring and relief Safety and health news Security risk assessment and protection in the chemical and process industry Simplified methods of using probit analysis in consequence analysis The importance of defining the purpose, scope, and objectives for process hazard analysis studies What have we really learned? Twenty five years after Piper Alpha When innocence is lost