Alert 03 – 30 Modified Tong Attachment Results in MTO
WHAT HAPPENED:
The rig crewmembers were working on the rig floor preparing to torque up the bit. A shackle was needed to attach the make-up chain to a line-pull sensor. Instead of getting a shackle from storage, the shackle was taken from the snub line on the breakout tong. The crewmembers did not replace the shackle following the bit being made up to the bit sub.