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A derrickman, also known as a drilling fluid operator (DFO), is a member of a drilling crew who works on a platform attached to the derrick or mast. They are usually about 20-25 meters above the rig floor.

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Derrickmen are responsible for guiding the stands of the drill pipe into the fingers at the top of the derrick. They are also responsible for the mud operation, testing the mud density, rigging up or down, transporting drilling and services rigs, and laying out tubing.
Derrickmen work in a more managerial role, helping drillers direct the flow of work. They almost always report directly to the Driller.
In an emergency, the derrickman can quickly reach the ground by an escape line often called the Geronimo line.
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