yeah, this was not their best investigation outcome. the main thing ITC did wrong was not maintain their pumps well enough and ignore HAZOP actions (which is very common unfortunately).

off top of my head i don't know that OSHA or EPA have changed any rules that CSB has recommended they change throughout the years, so no chance that PSM is updated now because of this one incident. the better things to take from CSB investigations are understanding causes and reflecting on how those relate to your facility.