Alert 10 – 18 Making Up Sub Assembly Results in a Fatality
WHAT HAPPENED:
The rig crew was using the top drive and back-up tong to make up the sub assembly. The pin end of the crossover sub was set into the bit breaker plate. As torque was applied to the sub assembly with the top drive, the crossover sub pin released from the bit breaker plate allowing the drill string and tongs to strike the rig floor crewman pinning him against the “A” leg of the derrick.