A Hand-Tightened Blind Flange and a Botched Shift Handover Killed 167 Men on Occidental Petroleum's Piper Alpha Platform in 22 Minutes. No One at the Company Was Ever Criminally Charged.
At around 10 p.m. on July 6, 1988, a pressure safety valve that had been pulled for maintenance that morning let gas condensate leak past a blind flange that had only been hand-tightened. Within 22 minutes, the Piper Alpha platform, 120 miles northeast of Aberdeen in the North