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Description

A service rig crew was lowering casing pipe (tail joint) into the channel slide when it snagged on the edge of the channel. This caused the travelling block assembly and tubing elevators to swing past the tubing tong line. When the snag released, the assembly began to swing back and, as the elevators passed the tubing tong line, a link on the chain hit the elevator latch. The elevators opened and the pipe was released, striking a worker in the face on the catwalk below. The worker was seriously injured.

The elevators are rated for working with casing. To remain stable, however, the casing must not move more than 15 degrees horizontally. When the snag occurred, that angle was exceeded.

A link on the winch chain hit the latch, opening the elevators.

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