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What happened?
A crew was preparing for a cementing operation.
An air hoist cable spool became tangled on the cable drum.
A rig worker assisted in unspooling and respooling the cable on the rig floor.
The worker was standing at the V-door, holding tension on the cable while the hoist operator began spooling up the cable.
The cable got caught at the bottom of the V-door ramp, creating additional tension.
The cable tightened up and pulled the worker through the V-door, away from the rig floor.
He slid down 20 feet/6 metres on the pipe slide to the pipe wrangler catwalk.
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Why did it happen?
V-door was damaged and remained opened during the task. In normal conditions, it would be closed.
The rig worker was instructed to hold tension on the cable near the open V-door.
The thimble eye of the hoist cable got caught at the bottom of the V-door ramp in the pipe wrangler, creating additional unexpected tension.
The rig worker was not wearing fall protection.
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What did they learn?
Re-spooling the hoist line should be performed on the rig floor, and not through the V-door.
Consider installing bump gate v-doors on rigs.
Investigate if tensioner devices could potentially eliminate or reduce ‘bird nesting’ (tangling) on the hoist lines.
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Ask yourself or your crew
How can something like this happen here? What can you do to prevent it?
What were the safeguards we would expect to be in place and healthy to prevent such an incident at our site? What would be the safeguards at our site that kept someone from dying / serious injury in case we did fall?
If you were asked to perform the same task in the same conditions:
- Where is safe to stand?
- What equipment would you need?
How can we prevent ‘bird nesting’ on hoist lines?
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Published on 02/12/19
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A V-door was left open during preparation for a task. A worker was pulled through the door and slid down 20 feet/6 metres on the pipe slide to the pipe wrangler catwalk.
