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ST-80 Cylinder Failure Causes Lower Leg Fracture | Issue 04-2025

The crew was in the process of pushing liner to bottom. After completing the first connection of heavy weight drill pipe, the Floor Hand was moving the ST-80 (iron roughneck) back to its parked position. While maneuvering the ST-80, the extend/retract hydraulic duplex cylinder suddenly failed, causing the unit to fall forward and downward.