"Geronimo line" and "8 inch." Oil field slang. Since I haven't worked in an oilfield, I don't know what you are talking about.
Stand of 8"..... 8" drill collars. usually 2 3/16" bore so the stand (3 joints still screwed together) weighs somewhere in the neighborhood of 14000 lbs. When you let one of them get out of control, it's not good.
Derrickhand and Geronimo Line.... When tripping pipe, the derrick hand is the one that works up in the air, by himself. There is a safety cable (Gerinmo line) attached to the monkey board and is anchored somewhere away from the rig. Attached to this cable is a safety device that goes around the cable and has a "T" bar to sit on. There is a spring loaded hand brake. If you have to evacuate the board quickly, instead of climbing down the ladder, you set on the T bar, push on the handle and that releases the brake, gravity will take you down the cable. As you near the ground, you pull on the hand brake and you can slow down and/or stop.
This vid shows a Geronimo line in use.
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