Incident Details:
Two contractors try to de-spade (3" class 900) at glycol contractor vessel (C-3610). They already loose all the stud bolts on the flange. When removing out the stud bolts until the one which handle the spectacle blind, one guy pulls it of the position that makes spectacle blind swing down to hit another who places his hand on the nozzle flange. The spectacle blind and nozzle flange nip at his thumb.
Incident Classification: RWDC