When a drill- or casing crew starts running the first pipes in the hole, little weight is transferred to the slips. The slips are tapered conform to the rotary bushings and they won’t sink in very deep. Once weight increases, the slips will set more firmly with a more aggressive bite on the pipe. With little pipe weight in the slips, they are not biting the pipe sufficiently, and there is a risk of slippage.
This is where the safety clamp enters the scene

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