Alert 03 – 11 Cable Caught in Rotary Hose Clamp Results in Near Miss


While lowering the block after completion of wire line logging operation, the port aft man-rider winch cable became hooked on the TDS mud safety chain clamp. This action caused increased tension on the cable, breaking the crown sheave swivel retaining pin, side plate and 2 safety slings. The sheave and line dropped 50 feet to just below monkey board level where it got hooked up on the block hang off line. The sheave retaining pin lock nut dropped to the starboard drill floor wind wall roof.

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